TM 9-2350-261-20-1

TECHNICAL MANUAL

UNIT MAINTENANCE

CARRIER, PERSONNEL,

FULL TRACKED, ARMORED, M113A2

2350-01-068-4077

CARRIER, COMMAND POST,

LIGHT TRACKED, M577A2

2350-01-068-4089

CARRIER, MORTAR, 107-MM, M30;

SELF-PROPELLED, M106A2

2350-01-069-6931

CARRIER, MORTAR, 81-MM, M29A1;

SELF-PROPELLED, M125A2

2350-01-068-4087

TABLE OF CONTENTS

i

INTRODUCTION

1-1

PRINCIPLES OF OPERATION

2-1

GENERAL MAINTENANCE AND

PREVENTIVE MAINTENANCE

CHECKS AND SERVICES

(PMCS) 2-39

TROUBLESHOOTING

3-1

MAINTENANCE OF ENGINE

4-1

MAINTENANCE OF POWER

PLANT 5-1

MAINTENANCE OF FUEL

SYSTEM

6-1

MAINTENANCE OF AIR

INDUCTION AND EXHAUST

SYSTEM 7-1

ALPHABETICAL INDEX

INDEX 1

CARRIER, MORTAR, 120-MM, M121;

SELF-PROPELLED, M1064

2350-01-338-3116

CARRIER, SMOKE GENERATOR,

FULL TRACKED, M1059

2350-01-203-0188

COMBAT VEHICLE, ANTI-TANK,

IMPROVED TOW VEHICLE, M901A1

2350-01-103-5641

CARRIER, STANDARDIZED INTEGRATED

COMMAND POST SYSTEM, M1068

2350-01-354-5657

This manual supersedes TM 9-2350-261-20-1 dated July 1985, including all changes.

DISTRIBUTION STATEMENT A:

Approved for public release: distribution is unlimited.

HEADQUARTERS, DEPARTMENT OF THE ARMY

11 JULY 1990 Change 4
TM 9-2350-261-20-1

CHANGE

No. 4 C4

HEADQUARTERS

DEPARTMENT OF THE ARMY

Washington, D.C., 15 July 1997

TECHNICAL MANUAL

UNIT MAINTENANCE

FOR

CARRIER, PERSONNEL, FULL TRACKED, ARMORED, M113A2

2350-01-068-4077

CARRIER, COMMAND POST, LIGHT TRACKED, M577A2

2350-01-068-4089

CARRIER, MORTAR, 107-MM, M30; SELF-PROPELLED, M106A2

2350-01-069-6931

CARRIER, MORTAR, 81-MM, M29A1; SELF-PROPELLED, M125A2

2350-01-068-4087

CARRIER, MORTAR, 120-MM, M121; SELF-PROPELLED, M1064

2350-01-338-3116

CARRIER, SMOKE GENERATOR, FULL TRACKED, M1059

2350-01-203-0188

COMBAT VEHICLE, ANTI-TAN& IMPROVED TOW VEHICLE, M901A1

2350-01-103-5641

CARRIER, STANDARDIZED INTEGRATRED COMMAND POST SYSTEM, M1068

2350-01-354-5657

TM 9-2350-261-20-1, July 1990, is changed as follows:

1. Remove old pages and insert new pages as indicated below.

2. New or changed material is indicated by a vertical bar in the margin

of the new page

3. Added or revised illustrations are indicated by a pointing hand

adjacent to the illustration.

i thru iv.1 (iv.2 blank)

1-11 and l-12

2-43 thru 2-46

2-49 and 2-50

2-59 and 2-60

2-75 and 2-76

2-97 thru 2-100 

g (h blank)

i thru iv.1 (iv.2 blank)

1-11 and 1-12

2-43 thru 2-46

2-49 and 2-50

2-59 thru 2-60.1 (2-60.2 blank)

2-75 and 2-76

2-97 thru 2.100

Approved for public release; distribution is unlimited.
TM 9-2350-261-20-1

C4

Remove Pages Insert Pages

2-109 and 2-110 2-109 (2-110 blank)

2-137 and 138 2-137 and 2-138

3-8.1 thru 3-10 3-8.1 thru 3-10

3-13 thru 3-16 3-13 thru 3-16

3-35 to 3-4 0 3-35 thru 3-40

3-49 and 3-50 3-49 and 3-50

3-45 thru 3-62 3-55 thru 3-62

3-143 and 3-144 3-143 and 3-144

3-175 end 3-176 3-175 and 3-176

3-235 thru 3-238 3-235 thru 3-238

3-243 and 3-244 3-243 and 3-244

3-251 and 3-252 3-251 and 3-252

3-254.1 thru 3-254.4 3-254.1 thru 3-254.4

3-263 end 3-264 3-263 and 3-264

3-267 and 3-268 3-267 and 3-268

3-271 and 3-272 3-271 and 3-272

3-279 thru 3-294 3-279 thru 3-294

4-9 and 4-10 4-9 and 4-10

5-13 and 5-14 5-13 and 5-14

6-65 thru 6-70 6-65 thru 6-7 0

7-7 and 7-8 7-7 and 7-8

Index-l thru Index30 Index-l thru Index-29 (Index-30 blank)

DA 2028-2 (Sample) and DA 2028-2 DA 2028-2 (Sample) and

Sample Reverse) DA 2028-2 (Sample Reverse)

DA 2028-2 and DA 2028-2 (Reverse) DA 2028-2 and DA 2028-2 (Reverse)

DA 2028-2 and DA 2028-2 (Reverse) DA 2028-2 and DA 2028-2 (Reverse)

DA 2028-2 and DA 2028-2 (Reverse) DA 2028-2 and DA 2028-2 (Reverse)

Metric Chart Inside Back Cover Metric Chart Inside Back Cover

Cover 1 and 2 Cover l and 2

File this change sheet in front of the publication for reference purposes.

By Order of the Secretary of the Army:

DENNIS J. REIMER

General, United States Army

Chief of Staff

Administrative Assistant to the

Secretary of the Army

03785

Distribution:

To be distributed in accordance with the initial distribution number (IDN) 371201 requirements

for TM 9-2350-261-20-1.

2
TM 9-2350-261-20-1 

C 3

CHANGE

No. 3 HEADQUARTERS

DEPARTMENT OF THE ARMY

Washington, D. C., 21 January 1994

TECHNICAL MANUAL

UNIT MAINTENANCE

F O R

CARRIER, PERSONNEL, FULL TRACKED, ARMORED, M113A 2

2350-01-068-4077

CARRIER, COMMAN D POST, LIGHT TRACKED, M577A 2

2350-01-068-4089

CARRIER, MORTAR, 107-MM, M30; SELF-PROPELLED, M106A 2

2350-01-069-6931

CARRIER, MORTAR, 81-MM, M29A1; SELF-PROPELLED, M125A 2

2350-01-068-4087

CHASSIS, GUN, ANTI-AIRCRAFT ARTILLERY, M741A 1

2350-01-099-8929

CARRIER, SMOKE GENERATOR, FULL TRACKED, M1059

2350-01-203-0188

COMBAT VEHICLE, ANTI-TANK, IMPROVED TOW VEHICLE, M901A 1

CARRIER, MORTAR ,

CARRIER, STANDARDIZE D

2350-01-103-5641

120-MM, M121; SELF-PROPELLED, M1064

2350-01-338-3116

INTEGRATED COMMAN D POST SYSTEM, M1068

2350-01-354-5657

TM 9-2350-261-20-1. 11 July 1990, is changed as follows:

1. Title is changed to reflect added new item of equipment, Carrier. Standardized

Integrated Command Post System, M1068.

2. Remove old pages and insert new pages as indicated below.

3. New or changed material is indicated by a vertical bar in the margin of

the page.

4. Added or revised illustrations are indicated by a pointing hand adjacent to

the illustration.

Remove Pages Insert Pages

e and f e, f, and g/(h blank)

i thru vi i thru vi

xiii (xiv blank) xiii (xiv blank)

1-4.1 (1-4.2 blank) 1-4.1 and 1-4.2

DISTRIBUTION STATEMENT C - Distribution authorized to U.S. Government agencies and their contractors for administrative and operational purposes only. This determination was made on 23 August 1989. Other requests for this document will

be referred to: Commander, U.S. Army Tank-Automotive Command, ATTN: AMSTA-MB, Warren, Ml 48397-5000.

DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of contents or reconstruction of the document.

1
TM 9-2350-261-20-1 

C 3

Remove Pages

1-7 thru 1-10

1-13 and 1-14

1-17 and 1-18

2-7 and 2-8

None

2-23 thru 26

2-39 thru 2-114

3-8.1 and 3-8.2

3-117 and 3-118

3-121 and 3-122

3-125 and 3-126

None

6-1 thru 6-4

6-7 and 6-8

6-21 and 6-22

6-49 thru 6-54

6-57 thru 6-60

6-65 and 6-66

6-69 and 6-70

6-73 and 6-74

Index-1 thru Index-27 (Index-28 blank)

Cover

Insert Pages

1-7 thru 1-10

1-13 and 1-14

1-17 and 1-18

2-7 and 2-8

2-18.1 and 2-18.2

2-23 thru 2-26

2-39 thru 2-139

3-8.1 and 3-8.2

3-117 and 3-118

3-120.1 thru 3-122

3-125 and 3-126

3-226.1 thru 3-226.136

6-1 thru 6-4

6-7 and 6-8

6-21 and 6-22

6-49 thru 6-54

6-57 thru 6-60 

6-65 and 6-66

6-69 and 6-70

6-73 and 6-74

Index-1 thru index-30

Cover

File this change sheet in front of the publIcation for reference purposes.

By Order of the Secretary of the Army:

Official:

GORDON R. SULLIVAN

General, United States Army

Chief of Staff

MILTON H. HAMILTON

Administrative Assistant to the

Secretary of the Army

06061

Distribution

To be distributed in accordance with DA Form 12-37-E (Block 1201) Unit Maintenance

requirements for TM 9-2350-261-20-1.

2
TM 9-2350-261-20-1 

SUMMARY OF WARNING S

WARNIN G

This list summarizes critical WARNINGS in this manuaL They are repeated here to let you know how

important they are. Study these WARNINGS carefully; they can save your life and the lives of personnel with

whom you work.

WARNIN G

Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and

gloves; use only in well-ventilated area; avoid contact with skin, eyes, and clothes,

and do not breathe vapors. Keep away from heat or flame. Never smoke when

using solvent; the flash point for type I dry cleaning solvent is 100”F (38°C) and for

type II is 138°F (50°C). Failure to do so may result in injury or death to personnel.

If personnel become dizzy while using cleaning solvent, immediately get fresh air

and medical help. If solvent contacts skin or clothes, flush with cold water. If

solvent contacts eyes immediately flush eyes with water and get immediate

medical attention.

WARNIN G

Unlocked ramp can open and move down slowly. If ramp system is damaged,

unlocked ramp can fall suddenly. Personnel can be killed or injured. Take care

when you work near ramp. Keep away from ramp that has come open during

carrier operation.

WARNIN G

Energized systems and equipment can burn you. If MASTER SWITCH is ON,

electrical system and equipment will be energized. Make sure MASTER SWITCH is

OFF when you work on electrical systems or equipment.

WARNIN G

Failure to set the parking brake and block the road wheels can allow the carrier to

move and could result in injury or death. Always set the parking brake and block

road wheels before working on the carrier.

WARNIN G

Battery post and cables touched by metal objects can short circuit and burn you.

Gas from batteries can explode and injure you. Battery acid can blind you or bum

you. Do not wear jewelry when you work on electrical systems. Use caution when

you work near battery or electrical system with tools or other metal objects. Do

not get acid on your skin or in your eyes. Do not allow sparks near batteries.

Change 2 a
TM 9-2350-261-20-1 

WARNIN G

Heater and engine exhaust can kill or poison you. Close power plant access panels

tight before you start engine. DO not run heater or engine indoors without very

good fresh air flow. Keep power plant access cover closed when you run engine.

Check for the smell of exhaust fumes. If you notice any fumes, open hatches and

turn on vent fans.

WARNIN G

Exhaust gases can make you ill or kill you. Signs of exhaust gas poison are

dizziness, headache, loss of muscle control, sleepiness, coma, or death. If anyone

shows signs of exhaust gas poisoning. Get all personnel out of carrier. Get medical

help. Make sure personnel have lots of fresh air. Keep personnel warm. Do not let

anyone do hard exercise. If anyone stops breathing, give artificial respiration.

WARNIN G

Torsion springs or bars can fly out and injure you. Make sure spring tension is

released before you start work.

WARNIN G

Air pressure in excess of 30 psi (207 kpa) can injure personnel. Do not direct

pressurized air at yourself or others. Always wear goggles.

WARNIN G

If you work on a earner that has been running, you could be burned. All tasks

begin with a cooled down carrier. Allow carrier to cool, or use care if you work on

a hot carrier.

WARNIN G

Unsafe use of chemical products, tools, and

follow warnings and instructions on labels

equipment can injure you. Read and

of all chemical products. Follow all

general shop safety procedures. See unit commander for further instructions on

safety.

Fire bottles

cotter pins

WARNIN G

can discharge and injure you. Insert antirecoil plugs, lock pins, and

before you work on or near fire bottles.

b
TM 9-2350-261-20-1 

WARNIN G

Hanging loads could kill or injure you. Keep away from hanging loads and

overhead equipment. Keep hands out of engine compartment while power unit is

being removed or installed.

WARNIN G

NBC agents can kill you. Do not service air cleaner or vent system after NBC

attack until carrier has been decontaminated.

WARNIN G

Starting engine right after a fire could restart the fire and kill or injure you. Do

not turn MASTER SWITCH ON until cause of fire has been repaired or removed.

WARNIN G

Loctite sealing compound can damage your eyes. Before you handle loctite sealing

compound, wear safety glasses/goggles, avoid contact with eyes. If it gets into your

eyes; flush eyes with fresh water and get medical help.

WARNIN G

Remove machine gun and all ammunition when operating

earner. Display Red Cross symbol on exterior of earner.

WARNIN G

M113A2 as a litter

To prevent litter tilt, which could cause injury, be sure to install repair link at

chain link.

WARNIN G

Loose clothing is dangerous around moving belts and pulleys. You could get badly

hurt if your clothes get caught in moving parts.

c
TM9-2350-261-20-1

WARNIN G

Hot radiator coolant can bum you. Use hand to remove cap ONLY if cool to touch.

Turn cap slowly to release pressure. Replace cap by pressing down and turning

until tight.

WARNIN G

Radiator is heavy and can cause back injury if handled improperly. Be sure to use

a hoist and helper to remove radiator.

Do not work under power

and equipment

starting task.

dam-age if

Carbon Monoxide is

power plant access

WARNIN G

plant. Power plant is heavy and may cause personnel

it falls. Lower

WARNIN G

power plant on wooden blocks before

Carbon Monoxide gas

covers and door are

poisonous and can kill you. Do not idle engine with driver’s

panel off unless there is very good air flow.

WARNIN G

is deadly poison. Play it safe: make sure power plant access

closed tight before you start engine.

WARNIN G

Damaged lifting slings can fail with load. Soldiers can be killed or injured. Inspect

all slings before use. Do not use damaged slings.

WARNIN G

Do not touch exhaust pipes with bare hands. You could get a bad burn.

 d
TM 9-2350-261-20-1 

WARNING

Gas from batteries can explode. Ventilate compartment before you disconnect or

connect battery cables. Battery acid can burn or blind you. Do not get acid on

your skin or eyes. ALWAYS disconnect negative (circuit 7) lead first and connect it

last.

WARNING

Battery posts and cables touched by metal objects can short circuit and burn you

or injure you. Use caution when you work with tools or other metal objects. Do not

wear jewelry when you work on electrical system.

Fuel and fog oil can

WARNING

burn and could poison you.

WARNING

Fog oil is slippery and can cause soldiers to fall and get injured. Clean up all

spillage or leakage of fog oil as soon as possible by washing the area or absorbing

the fog oil with sand or other absorbent material.

WARNING

You could be killed or injured by accidental carrier movement. Before you

perform maintenance, make sure to properly block the carrier.

WARNING

Hanging loads can kill or injure you. Keep away from hanging loads and overhead

equipment. Keep hands away from pinch points.

WARNING

Lifting or moving objects in excess of 70 pounds could injure you. Make sure to get

an assistant or use a lifting device to move fog oil tank, armor, or other heavy

objects. 

Change 3 e
TM 9-2350-261-20-1 

WARNIN G

Compressed air pressure from smoke generator can cause serious injury or death.

To avoid accidents, bleed air before working on air compressor assembly or

disconnecting

Fire resistant

any air hose.

WARNIN G

hydraulic (FRH) fluid may contain Tricresyl Phosphate which, if

taken internally, can produce paralysis. Hydraulic fluid may be absorbed through

the skin. Wear long sleeves, gloves, goggles, and face shield. If FRH gets in eyes,

wash them immediately and get medical aid immediately. If FRH gets on your

skin, thoroughly wash with soap and water. Wash hands thoroughly prior to eating

or smoking.

.

WARNIN G

Chemical Agent Resistance Coatings (CARC) are toxic. Use a respirator when

spraying or brushing CARC. To identify the needed respirator and detailed safety

information, consult your environmental or safety office before using CARC.

Protect your hands and wrists with rubber gloves. Wear coveralls. Keep your eyes

protected with splash goggles or face shield. Never mix paint or use thinner near

an open flame during painting and for at least four to six hours afterward. Make

sure the temperature of the surface to be painted is not less than 60°F and no more

than 100°F. One person is not to use more than one quart of CARC a day. Two

people will not paint an item at the same time.

WARNIN G

Vehicle operation during hot weather may result in potential heat stress to crew

members. Crew members should limit their exposure based on TB med 507 using

PHEL Chart (Appendix C) curve as a guide.

WARNIN G

Start up of equipment or moving parts could injure you or others. If other

personnel are working on your carrier, be sure you know what they are doing.

Place DO NOT OPERATE tags on MASTER SWITCH when needed to prevent

startup.

WARNIN G

Power cable connections should not be attempted until grounding system and

signal/data cabling have been completed.

System ground must be completed prior to making any power connections. Failure

to do so may result in personal injury and/or damage to the equipment.

Improper or loose connection between the surface wire grounding systems and

ground lugs could cause a short in the system, which may cause personal injury.

f Change 3 
TM 9-2350-261-20-1

WARNING

HIGH VOLTAGE is used in the operation of this equipment.

DEATH ON CONTACT may result if personnel fail to observe safety precautions.

NEVER work on equipment unless at least one other person familiar with the

operation and hazards of the equipment is nearby. That person should also be

competent in giving first aid. When an operator helps a technician, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment before beginning work. When working

inside equipment with power off, take special care to ground every capacitor

likely to hold a dangerous potential.

BE CAREFUL not to contact high-voltage connections when installing or

operating this equipment.

BEEP one hand away from the equipment to reduce the hazard of current flowing

through life-sustaining organs of the body.

WARNING

The insulator blanket is made out of asbestos. Handle with care. Discard insulator

blanket properly as a hazardous material per local standard operating procedure.

The insulator washer takes the place of the blanket.

Change 4 g (h blank)
Technical Manual

No. 9-2350-261-20-1

TM 9-2350-261-20-1

HEADQUARTERS

DEPARTMENT OF THE ARMY

Washington, D.C., 11 July 1990

TECHNICAL MANUAL

UNIT MAINTENANCE

CARRIER, PERSONNEL, FULL TRACKED, ARMORED, M113A2

2350-01-068-4077

CARRIER, COMMAND POST, LIGHT TRACKED, M577A2

2350-01-068-4089

CARRIER, MORTAR, 107-MM, M30; SELF-PROPELLED, M106A2

2350-01-069-6931

CARRIER, MORTAR, 81-MM, M29A1; SELF-PROPELLED, M125A2

2350-01-068-4087

CARRIER, MORTAR, 120-MM, M121; SELF-PROPELLED, Ml064

2350-01-338-3116

CARRIER, SMOKE GENERATOR, FULL TRACKED, Ml059

2350-01-203-0188

COMBAT VEHICLE, ANTI-TANK, IMPROVED TOW VEHICLE, M901Al

2350-01-103-5641

CARRIER, STANDARDIZED INTEGRATED COMMAND POST SYSTEM, Ml068

2350-01-345-5657

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes, or if you know a way to improve the

procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publications

and Blank Forms), or DA Form 2028-2 located in the back of this manual, directly to: Commander, U.S.

Army Tank-automotive and Armaments Command, ATTN:AMSTA-AC-NML, Rock Island, IL. 61201-9948.

A reply will be furnished to you.

This manual supersedes TM 9-2350-261-20 dated July, 1985, including all changes.

DISTRIBUTION STATEMENT A:

Approved for public release; distribution is unlimited.

Change 4 i
TABLE OF CONTENTS

TM 9-2350-261-20-1

HOW TO USE THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi

CHAPTER

Section

CHAPTER

Section

CHAPTER

Section

CHAPTER

CHAPTER

CHAPTER

Section

CHAPTER

Section

CHAPTER

Section

1 INTRODUCTION................................................................... 1-1

I General Information ................................................................ . l - l

II Equipment Description and Data ............................................... . 1-12

2 PRINCIPLES OF OPERATION .................................................. . 2 - l

I Integrated systems................................................................. . 2 - l

II Integrated components ........................................................... . .2-8

III Service Upon Receipt of Material................................................ 2-24

IV General Maintenance Procedures ................................................ 2-27

V Unit Preventive Maintenance Checks and Services (PMCS). ................ 2-39

3 GENERAL TROUBLESHOOTING PROCEDURES............................ 3 - l

I How to Use Troubleshooting ...................................................... . 3 - l

II Troubleshooting ..................................................................... . 3-8

III STE/ICE-R Troubleshooting.................................................. 3-236.1

4 ENGINE-RELATED COMPONENTS MAINTENANCE.. . . . . . . . . . . . . . . . . . . . . .4-l

5 POWER PLANT MAINTENANCE. . . . . . . . . . . . . . . . . . . . ........................... 5 - l

6 FUEL SYSTEM MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 - l

I Fuel System Hose Replacement, Diagrams, and Tests.. . . . . . . . . . . . . . . . . . . . . . . 6-l

II Inside Fuel Tank and Hoses, Tubes, and Fittings

(M113A2, M1059, M577A2, and M901A1 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-4

III External Fuel Tanks and Hoses, Tubes, and Fittings (M981 and Ml064

Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27

IV Sponson Mounted Fuel Tanks and Lines (M577A2 Only) . . . . . . . . . . . . . . . . . . . 6-49

V Fuel Compartment and Hoses, Tubes and Fittings

(M125A2 and M106A2 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-76

VI Fuel Compartment, Bladder, Hoses, Tubes, and Fittings (M741Al Only). 6-87

VII Bulkhead to Injectors Engine Fuel and Air Hoses.. . . . . . . . . . . . . . . . . . . . . . . . . . 6-101

VIII Fuel System Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-120

7 AIR INDUCTION AND EXHAUST SYSTEM MAINTENANCE ............ 7 - 1

I Air Induction System .............................................................. . 7 - 1

II Engine Exhaust System.. ........................................................ 7-15

8 COOLING SYSTEM MAINTENANCE........................................... 8 - l

I Engine Coolant Pump, Radiator, and Tubes ................................... 8-1

II Fan and Drive Components. .................................................... . 8-34

i i Change 4
TM 9-2350-261-20-1

CHAPTER

Section

CHAPTER

CHAPTER

Section

CHAPTER

Section

CHAPTER

CHAPTER

CHAPTER 15

CHAPTER 16

CHAPTER

Section

17

I

II

III

IV

18

19

20

CHAPTER

CHAPTER

CHAPTER

9

I

II

III

10

11

I

II

12

I

II

III

IV

V

VI

13

14

ELECTRICAL SYSTEM MAINTENANCE - POWER RECEPTACLES,

GENERATOR, AND REGULATOR.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Auxiliary Power Receptacles.. . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Maintenance of Master Switch Panel Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-12

Maintenance of Generator, Regulator, and

Circuit 49 Lead Wire Assemblies.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-28

STARTER SYSTEM MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1

ELECTRICAL SYSTEM MAINTENANCE - INSTRUMENT AND

WARNING LIGHT PANELS ................................................. 11-1

Instrument Panel .................................................................. 11-1

Warning Light Panel............................................................. 11-21

ELECTRICAL SYSTEM MAINTENANCE - HORN AND LIGHTING

SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

Horn and Exterior Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1

Maintenance of Wiring Harness (M741A1 Only)... . . . . . . . . . . . . . . . . . . . . . . . . . 12-15

Maintenance of Distribution Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-22

Maintenance of Stop Light, Dome Lights

Buzzer and Door Switches, and Tent Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-56

Maintenance of Wiring Harness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-78

Maintenance of Stop Light Switch and

Infrared Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-131

ELECTRICAL SYSTEM MAINTENANCE - BATTERIES.. . . . . . . . . . . . . . . . 13-1

ELECTRICAL SYSTEM MAINTENANCE - WIRING HARNESS,

RECEPTACLE, AND CABLE REPAIR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-1

ELECTRICAL SYSTEM MAINTENANCE - POWER PLANT WIRING

HARNESS AND RELATED COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-1

ELECTRICAL SYSTEM MAINTENANCE - BILGE PUMP, WIRING, AND

RELATED COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-1

TRAILER HARNESS, RECEPTACLES, BLOWER, SWITCHES, AND

VENTILATION SYSTEM MAINTENANCE................................ 17-1

Trailer Harness.................................................................... 17-1

Communication and Utility Receptacles ........................................ 17-4

Rear Compartment Blower and Fuel Quantity

Selector Switch (M577A2 Only) ............................................. 17-14

Deleted ............................................................................. 17-18 

TRANSMISSION RELATED COMPONENTS MAINTENANCE.. . . . . . . . . . 18-1

TRANSFER GEARCASE-RELATED COMPONENTS . . . . . . . . . . . . . . . . . . . . . . . 19-1

DRIVE SHAFTS, UNIVERSAL JOINTS, AND

FINAL DRIVE MAINTENANCE.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1

Change 4 i i i
TM 9-2350-261-20-1

CHAPTER

CHAPTER

CHAPTER

Section

CHAPTER

Section

CHAPTER

CHAPTER

CHAPTER

CHAPTER

Section

CHAPTER

CHAPTER

CHAPTER

21 DIFFERENTIAL RELATED COMPONENTS MAINTENANCE ............ 21-1

22 TRACKS AND SUSPENSION MAINTENANCE ............................. 22- l

23 DRIVERS CONTROLS........................................................... 23- l

I Steering Controls .................................................................. 23- l

II Accelerator and Transmission Linkage, Throttle Linkage, and

Fuel Cutoff Cable. ............................................................. 23-21

III Transmission Controls and Engine Power Disconnect ....................... 23-47

IV Pivot Steer and Controls ........................................................ 23-60

24 HULL MAINTENANCE.......................................................... 24- l

I Lifting Eyes, Towing Eyes, Pintle, and Tow Rope Stowage Pads .......... 24- l

II Trim Vane, Power Plant Front Door, and Power Plant Access Door....... 24-7

III Hull Bottom Covers, Drain Plugs, and Box Beam Plugs ................... 24-31

IV Driver’s and Rear Compartment Floor Plates ................................ 24-36

V Grill Assembly, Top Deck Hatches, Ventilator, and

Generator Set Enclosure. ..................................................... 24-48

VI Armor and Support Maintenance (M901A1 Only) ........................ . 24-11 9

VII Driver’s Seat and Commander’s Seat Platform (All Configurations). .... .24-126

VIII Personnel Seats- Rear Compartment ........................................ 24-16 2

IX Blackout Curtain and Tables (M577A2, Ml068 and M901A1 Only). ... .24-170

X Tent and Frame ................................................................. 24-181

XI Ammunition and Fuze Racks (M106A2, M1064, and M125A2 Only) ... 24-185

XII Ammunition Containers and Components (M741A1 Only). .............. 24-194

XIII Turret Guard, Gun Travel Lock, and Flotation Pods (M741A1 Only) .. .24-209

XIV Dataplates, Stencils, Markers, Decals, and

Miscellaneous Stowage Items .............................................. 24-21 6

XV Stowage System Maintenance ................................................ 24-26 4

XVI Antenna Mast Maintenance................................................... .24-276

25 RAMP CONTROLS, RAMP, AND RAMP DOOR MAINTENANCE ....... 25-l

26 WELDING - CAUTIONS, WARNINGS; AND INSTRUCTIONS.......... 26-l

27 SMOKE GRENADE LAUNCHER AND AMMUNITION SPACERS ....... 27-l

28 HYDRAULIC SYSTEM - RAMP AND SUSPENSION LOCKOUT ....... 28-l

I Hydraulic Tank, Valves, and Lines (All Except M741A1). .................. 28- l

II Hydraulic Tank, Valves, and Lines (M741A1 Only). ........................ 28-24

HI Suspension Lockout System (M741A1 Only).................................. 28-47

IV Ramp Pump, Ramp Control Valve, and Ramp Cylinder.. .................. 28-80

28.1 AUXILIARY GENERATOR.. .................................................. 28.1-1

29 PERSONNEL HEATER KIT COMPONENT MAINTENANCE............. 29-1

30 DRIVERS WINDSHIELD KIT .................................................. 30-1

i v Change 3
TM 9-2350-261-20-1

CHAPTER 31 ELECTRONIC EQUIPMENT HEATER KIT (M577A2 Only). .............. 31-1

Section I Heater Component Maintenance

CHAPTER

Section

CHAPTER

CHAPTER

CHAPTER 35 MARINE RECOVERY KIT (M113A2 and Ml059 Only) . . . . . . . . . . . . . . . . . . . . . 35-l

CHAPTER 36 LITTER KIT MAINTENANCE (M113A2 Only) Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36-l

CHAPTER

Section

CHAPTER 38 MACHINE GUN ARMOR SHIELD KIT MAINTENANCE.. ............... 38-l

CHAPTER

Section

Section

CHAPTER

CHAPTER

Section

Section

Section

CHAPTER 41 COMMUNICATION SYSTEM MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41-1

CHAPTER 42 FIXED FIRE EXTINGUISHER SYSTEM MAINTENANCE................. 42-l

CHAPTER 43 DELETED .......................................................................... 43-l

CHAPTER 44 CHEMICAL AGENT AUTOMATIC ALARM KIT (M113A2 Only) . . . . . 44-l

(Stewart Warner Corp., Model 10560M24B1)............................... 31-1

II Heater Component Maintenance (Hupp Corp., Model MF510B)............. 31-1

III Electronic Equipment Heater..................................................... 31-2

32 ENGINE COOLANT HEATER KIT ............................................ 32-l

I Description and Data ............................................................. 32-l

II Coolant Heater Component Maintenance ....................................... 32-3

III Kit Component Maintenance - Engine Coolant Heater ..................... 32-9

33 RAMP NON-SKID WINTERIZATION KIT MAINTENANCE

(M106A2, M125A2, and Ml064 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33-l

34 CAPSTAN KIT (M113A2 and Ml059 Only) ............................. . 34-l

37 ARTILLERY COMMUNICATION KITS (M577A2 Only). ................... 37- l

I Deleted .............................................................................. 37- l

II Artillery Communication Kit (M577A2 Only).................................. 37- 5

39 NBC KIT MAINTENANCE (ALL VEHICLES EXCEPT M1064) .......... 39-l

I NBC Kits (All vehicles except M1064 and M981) ............................ 39-1

II Ventilation System Maintenance (M981 Only) .............................. 39-98

40 SMOKE GENERATOR EQUIPMENT MAINTENANCE (M1059 Only) . . . 40-l

40.1 ELECTRICAL/COMMUNICATION EQUIPMENT MAINTENANCE (Ml068

Only) ........................................................................... 40.1-l

I Curbside Electrical/Communication Equipment (M1068 Only). ............ 40.1-l

II Roadside Electrical/Communication Equipment (M1068 Only). .......... 40.1-25

III Electrical/Communication Equipment Cables (M1068 Only) ............ ..40.1-57

Change 4 iv.1 (iv.2 blank)
TM 9-2350-261-20-1 

APPENDIX

APPENDIX

Section

APPENDIX

Section

APPENDIX

Section

APPENDIX

A. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1

B. MAINTENANCE ALLOCATION CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

I Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1

II Maintenance Allocation Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4

III Tools and Test Equipment Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-14

IV Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-21

C. EXPENDABLE/DURABLE SUPPLIES AND MATERIALS LIST . . . . . . . . . . . . . . . . . . . . . C-1 

I Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1

II Expendable/Durable Supplies and Materials List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3

D. COMMON TOOLS AND SUPPLEMENTS AND

SPECIAL TOOLS/FIXTURES LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

I Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

II Common Tools and Supplements and Special Tools/Fixtures List . . . . . . . . . . . D–3

E. FABRICATED TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1 

ALPHABETICAL INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I-1

DA FORM 2028 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... Behind Index

WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FO-1 thru FO-11

METRIC CONVERSION CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Inside Back Cover

Change 3 v
TM 9-2350-261-20-1 

HOW TO USE THI S

This manual tells you how to perform unit maintenance for

M741A1, M1059, M1064, M1068, and M901A1 Carriers.

MANUA L

the M113A2, M106A2, M125A2, M577A2,

Before starting a task or procedure, read HOW TO USE THIS MANUAL and CHAPTER 2, PRINCIPLES

OF OPERATION.

USING YOUR MANUAL ON THE JOB

The best way to learn about this manual is to practice using it. Knowing how to use this manual will save both

time and energy.

WHICH TYPE OF TASK DO YOU USE?

There are two different types of tasks in this manual. They are maintenance tasks and troubleshooting tasks.

Decide which type of task you need to use.

TROUBLESHOOTING TASKS

Troubleshooting tasks help YOU locate faulty parts. They direct YOU to the maintenance task to correct these

faults. CHAPTER 3, TROUBLESHOOTING, contains detailed information on how to perfrom troubleshooting tasks. Read CHAPTER 3, Section I, before performing the troubleshooting tasks in the chapter.

MAINTENANCE TASKS

Doing maintenance tasks will keep the carrier in shape to operate. Maintenance tasks are used to present

maintenance instructions. Each maintenance task details steps which you need to perform. If the vehicle and

parts need maintenance that is not included in any task in the manual, report this to your supervisor.

HOW DO YOU FIND THE CORRECT TASK?

Pick a key word from the carrier part or system to be used during the task. Look in the ALPHABETICAL

INDEX for this key word or the name of the action you will perform. Turn to the page indicated.

The ALPHABETICAL INDEX lists each task under one or more headings. The task, REPLACE TOWING

PINTLE, could be found:

Under “P”

Pintle, towing:

Repair: 24-4

Under “T”

Towing pintle:

Repair: 24-4

HOW DO YOU READ MAINTENANCE TASKS?

Be sure to read all warnings, cautions, and notes. These are in all types of tasks. They help you avoid harm to

yourself, other personnel and equipment. They also tell you things you should know about the task.

vi Change 3
TM 9-2350-261-20-1 

Before starting, get all tools, supplies, and personnel listed on the setup page needed to do the task. Be sure to

read the task before performing the maintenance. If any other tasks are referenced, you must go to the setup

page for each of those

Start with step 1 and

Look at the drawings.

REFERENCES

tasks to find out what tools, parts and materials will be needed.

do each step in given order.

These show you what to look for when reading a maintenance task.

References within a task refer to a different manual or to another task in the same manual. They are found in

the INITIAL SETUP and in the FOLLOW-THROUGH STEPS. Below is an example.

MASTER SWITCH OFF (see your -10)

Battery ground lead disconnected (page 13-2)

For all tasks, the following comments apply:

Parts which are listed on the setup page will be referred to as “new” in the task setup when

installed.

Examples are:

gaskets

lockwashers

some preformed packings

some retaining rings

These and other new parts are listed under MATERIALS/PARTS in the initial set up.

GENERAL MAINTENANCE

Cleaning, inspecting, checking for leaks, and similar procedures which apply to most tasks are found in

CHAPTER 2, Section IV, GENERAL MAINTENANCE PROCEDURES. Use these steps to clean and inspect

any part being removed, repaired, or installed. Special cleaning will be covered in the task step. Below is a step

that would require general cleaning.

5. Remove gasket (1) from upper tube flange (2). Discard gasket.

After doing this step, you would clean the mating surface with cleaning solvent and a wiping rag according to

the general cleaning procedures. In other tasks, hoses or rubber hatch seals will need to be checked for leaks.

Refer to CHAPTER 2 for general procedures.

vii
TM9-2350-261-20-1

SAMPLE OF SETUP ITEMS

The sample below shows the DESCRIPTION and INITIAL SETUP sections on the first page of a task. Items

to watch for are listed in the legend. Match them with the sample.

REPLACE MASTER SWITCH ASSEMBLY

DESCRIPTION

This task covers: Remove (page 9-13). Install (page 9-14).

References: 

General mechanic Tool Kit (Item 30, App D) see your -lo

Equipment Conditions: 

Lockwasher (3) Engine stopped / shutdown (see your -10)

Self-locking nut (2)

Self-locking nut (8) Battery ground lead disconnected (page13-2

Unit Mechanic

Legend to Sample

TITL E This is the name of the task.

DESCRIPTION This describes the overall actions you will perform. Also, it tells

you the page where each action begins.

TOOLS These are the tools and equipment you will need to do the task.

MATERIALS/PARTS These are supplies you will need to do the task. If more than one

part is needed, the quantity will be in parenthesis following the

name of the part. The

replace every time the

and Special Tools List

parts you need for the

only parts listed are those you must

task is performed. Use the Repair Parts

(RPSTL), TM9-2350-261-24P, to order

task.

PERSONNEL

REQUIRED

REFERENCES

 EQUIPMENT

CONDITIONS

These are the personnel needed to do the

These are the

task.

other technical publications

task.

you will need to do the

These are the conditions the equipment must be in before you

start the task. You will be referred to the task or technical publication needed to meet each equipment condition. This reference

will be given in parenthesis after each equipment condition.

viii

Carrier blocked (see your-10)

personnel required:

Tools: 

 Materials/Parts;

INITIAL SETUP 
 TM 9-2350-261-20-1 

NOTE

When performing equipment conditions

tasks, do only those steps required to gain

access to complete the major task. Some

tasks will include all of the items listed in

the legend. Others will only include some of

the items.

Read the INITIAL SETUP section carefully before you start each task. Get the tools and supplies listed and

the personnel needed. Be sure the equipment is in the condition required.

SAMPLE OF TASK STEPS

The sample below shows you some of the signs to watch for when you are performing a task. Read all the

steps, warnings, cautions and notes before starting each task. Some items to watch for are listed in the

legend, match them with the sample.

REMOVE

WARNING

If road wheel lifter slips while

lowering road arm, it could

injure you. Stand clear before

you lower road arm.

1. With road wheel removed and road arm

raised on lifter, Start engine (see your - 10).

Place range selector in 1. Slowly drive carrier

forward off lifter so that road wheel support

arm (1) hangs freely.

2. Remove screw (2) from plug (3).

Legend to Sample Above

WARNING

STEP

LOCATOR

CLOSEUP

This describes possible injury to personnel.

This tells you what to do and how to do it.

This helps you locate equipment on the earner or major components. An arrow will lead you from the locator to the closeup. If

the arrow is dotted, it means that the item is located behind

something.

This shows you a closeup of the equipment.

ix
TM 9-2350-261-20-1 

In addition to the items listed, cautions and notes may be listed. Cautions deal with things or actions which

could damage equipment. Notes contain facts to make tasks easier. Also, notes tell you about conditions that

effect the step that follows them.

Each task includes step-by-step illustrated instructions. The numbered steps tell you WHAT to do and HOW

to do it. Each numbered part in the instructions matches the same number in the drawings of the task. When

they are needed, warnings, cautions, and notes always appear just above the task step to which they apply.

Read all steps, warnings, cautions and notes before starting to do the task. It is important to do each step in

the order given. FOLLOW-THROUGH STEPS tell you what to do after the maintenance task is done. The

words END OF TASK will tell you when you have finished the job.

PREVENTIVE MAINTENANCE CHECKS AND SERVICES

Preventive maintenance is required to keep your carrier in good running condition. Preventive Maintenance

Checks and Services (PMCS) for unit maintenance are made on a periodic basis, and are found in CHAPTER

2, Section V of this manual.

SAMPLE OF PMCS PROCEDURES

The sample below shows you what to look for when you read a PMCS procedure. Items to watch for are listed

in the legend. Match them with the sample.

UNIT PREVENTIVE MAINTENANCE CHECKS AND SERVICES

 SEMIANNUAL (S) OPERATION CHECKS

ITEM ITEM TO BE

NO. INSPECTED PR OCEDURES 

7 TRACKS

PIN/NUTS

8 TRACK

“GROUSER

Check track pin nuts (1)for looseness or cracks. Replace cracked nuts.

Check track pins (2) for stripped threads. Replace stripped track pine.

Tighten Ioose nuts to 115-135 lb-ft (156-183 N•m) torque. Use torque

wrench (Item 96, App D).

Check grouser (3) for wear or cracks on both tracks Replace track shoe

if grouser measures less than 1/8 inch (3mm) in height or is cracked.

x
TM 9-2350-261-20-1 

Legend to Sample

ITEM NO.

INTERVAL

ITEM TO BE

INSPECTED

PROCEDURES

This tells you the number of the item to be checked or serviced.

This tells you how often the items are checked or serviced.

This tells you the item to be checked or

serviced.

This tells you what to do. Illustrations may be included in this

section to help you perform the procedures or you will be directed

to another manual.

WARNINGS, CAUTIONS, AND NOTES

Be sure to read all warnings and cautions in the task. Ignoring a warning could cause death or injury to

yourself or other personnel. Ignoring a caution could cause damage to equipment. Notes contain facts to make

the task easier. Warnings, cautions, and notes always appear just above the task step to which they apply.

WARNINGS: Call attention to the things that

could injure personnel.

 WARNING

Lowering ramp could injure

personnel. Make sure ramp

zone is clear before you lower ramp.

CAUTIONS: Call attention to the actions or

materials that could damage equipment.

CAUTION

Improper cable actions or removal can

cause a short circuit. Remove negative

cable prior to removing positive cable.

NOTE

NOTES: Contain information you should know. Two personnel are required to perform this

task.

HELPER

Helpers are needed in tasks that require more than one person such as to help lift heavy objects. A helper may

also be needed to act as an outside observer, drive the earner, or do similar tasks.

If a helper is needed to perform a task, the INITIAL SETUP will tell you:

Example: Personnel required:

Unit Mechanic

Helper (H)

xi
TM 9-2350-261-20-1 

If a helper assists with a step or substep, the step or substep will include: ‘Have helper assist.’

Example: 3. Remove panel. Have helper assist.

If a helper performs the action alone, the step or substep will start with (H).

Example: 2. (H) Turn MASTER SWITCH ON.

LOCATIONAL TERMS

The terms FRONT, REAR, LEFT AND RIGHT are used to describe where items are located. THE POINT OF

REFERENCE FOR THESE TERMS IS DIFFERENT FOR CARRIER ITEMS AND POWER UNIT ITEMS.

(Carrier items are items which are not on the power unit. Power unit items are items on the engine,

transmission, differential, or transfer gearcase.)

If you are working with carrier items, use this point of reference. Think of the location as if you were sitting in

the driver’s seat looking forward.

If you are working with power unit items, use this point of reference. Think of the locations as if you were

standing at the transfer gearcase end of the power unit and facing the flywheel. This rule applies whether the

power unit is IN or OUT of the carrier.

xii
TM 9-2350-261-20-1 

HOW TO USE THE REPAIR PARTS AND SPECIAL TOOLS LIST (RPSTL )

WITH THIS MANUA L

The RPSTL (TM 9-2350-261-24P) gives the National Stock Number (NSN) required to order parts used in

the maintenance tasks. To use the RPSTL to identify and order a part, do the following:

1. In this manual, turn to the first page of the task to be performed.

2. Find Materials/Parts under INITIAL SETUP, and read the part(s) that need replacement. If required,

find the illustrated part in the task steps.

3. Go to the RPSTL and find the same illustrated part. That part will have an item number assigned to it.

Look this item number up in the listing for that figure. The NSN can be found in the NSN column.

4. If you inspect an item and find that it is damaged, go to the RPSTL and find the SMR code for the item. If

the SMR code does not authorize you to repair the item, reassemble it and send it to the authorized level of

maintenance.

5. The usable on code in the RPSTL appears in the lower left comer of the Description column heading. Usable

on codes are shown as ‘UOC . . . . . . .‘in the Description Column justified left) on the fist line following the

item description/nomenclature. Uncoded items are applicable to all models. Identification of the usable on

codes in the RPSTL are:

Code

V36

V37

V38

V83

V95

011

056

120

ACP

Used On

M113A2 Carrier, Personnel

M125A2 Carrier, 81 mm Mortar

M577A2 Carrier, Command Post

M106A2 Carrier, 107 mm Mortar

M981 Carrier, Personnel, Armored Fire Support

M741A1 Chassis, 20 mm Anti-Aircraft Gun

M901A1 Combat Vehicle, Anti-Tank Improved

TOW Vehicle

M1059 Carrier, Personnel, Smoke

M1064 Carrier, 120 mm Mortar

M1068 Carrier, Standardized Integrated

coremand Post System

Change 3 xiii (xiv blank)

V 35
TM 9-2350-261-20-1

CHAPTER 1

INTRODUCTIO N

Section I. GENERAL INFORMATIO N

SCOPE

Type of Manual: Unit Maintenance

Model Number and Equipment Name:

M113A2 - Armored Personnel Carrier, Full Tracked

Purpose of Equipment: Transportation and positioning combat troops and supplies.

1-1
TM 9-2350-261-20-1 

M577A2 - Light Tracked Command Post Carrier.

Purpose of Equipment: Provides protection and mobility for field commanders in a tactical environment.

1-2
TM 9-2350-261-20-1

M106A2 - Self-propelled 107-mm Mortar Carrier.

Purpose of Equipment: Provides mobility for the 4.2 inch (107-mm) mortar M30. The mortar can be fired

from a turntable mounted in the carrier or from a portable off vehicle mount.

See TM 9-1015-232-23&P for Unit and D S maintenance and repair parts for the 81-mm turntable and

mount and the 4.2 inch (107-mm) turntable and mount.

See TM 9-1015-215-20&P for Unit maintenance and repair parts for the 4.2 inch (107-mm) mortar M30.

1-3
TM 9-2350-261-20-1 

M125A2 - Self-propelled 81-mm Mortar Carrier.

Purpose of Equipment: Provides mobility for the 81-mm mortar cannon. The mortar can be fired from a

turntable mounted in the carrier or from a portable off vehicle mount.

See TM 9-1015-232-23&P for Unit and D S maintenance and repair parts for the 81-mm turntable and

mount and the 4.2 inch (107-mm) turntable and mount.

See TM 9-1015-200-20&P for Unit maintenance and repair parts for the 81-mm mortar M29A1.

1-4
TM 9-2350-261-20-1 

M1064 - Self-propelled 120-mm Mortar Carrier.

Purpose of Equipment: Provides mobility for the 4.7 inch (120-mm) mortar, M121 or M120. The M121

mortar can be fired from a turntable mounted in the carrier and the M120 mortar from a portable mount off

the vehicle.

See TM 9-1015-250-23 and TM 9-1015-250-23&P for Unit and DS maintenance and repair parts for the

4.7 inch (120-mm) mortar, M121 or M120.

Change 3 1-4.1
TM 9-2350-261-20-1 

M1068 - Standardized Integrated Command Post System Carrier

Purpose of Equipment: Designed as a command post and field office to support the various configurations and

installation layouts of the ATCCS Army Tactical Command And Control System and provide protection for

field commanders in a tactical environment.

1-4.2 Change 3
TM 9-2350-261-20-1 

M741A1 - Self-Propelled 20-mm Anti-Aircraft Artillery Gun Chassis Carrier.

Purpose of Equipment: Provides mobility for the M168 20-mm cannon.

1-5
TM 9-2350-261-20-1 

M901A1 - Combat Vehicle, Anti-Tank, Improved Tow Vehicle.

Purpose of Equipment: Provides mobility for heavy anti-tank weapon designed and built to attack and defeat

armored vehicles and other targets such as field fortifications.

1-6
TM 9-2350-261-20-1

M1059 - Full Tracked Smoke Generator Carrier.

Purpose of Equipment: Designed to generate a smoke screen in the battlefield environment.

1-7
TM9-2350-261-20-1

The M741A1 Self-Propelled Carrier, and M901A1 Combat Vehicle have their own Lubrication Order and

Operator’s Manual; LO 9-2350-300-13, TM 9-2350-300-10 (M741A1), LO 9-2350-259-12, and

TM 9-2350-259-10 (M901A1). The M113A2, M577A2, M125A2, M106A2, M1059, M1068, and M1064

have a common Lubrication Order, LO 9-2350-261-12, and a common Operator’s Manual,

TM 9-2350-261-10.

The 81-mm, 4.7 inch (120-mm), and 4.2 inch (107-mm) mortars have their own unit maintenance manuals;

TM 9-1015-200-20&P, TM 9-1015-215-20&P, and TM 9-1015-250-23&P. However, their turntables and

mounts are common and are covered in TM 9-1015-232-23&P.

Data for the M113A2 Personnel Carrier which is common to the M901A1 Anti-Tank Improved TOW Vehicle

is contained in this manual. Data peculiar to the M901A1 is contained in TM 9-2350-259-20.

The terms left and right as used in this manual are defined as standing at the rear ramp and looking toward

the front of the carrier.

MAINTENANCE FORMS, RECORDS, AND REPORT S

Department of the Army forms and procedures used for equipment maintenance will be those prescribed by

DA Pamphlet 738-750, The Army Maintenance Management Systems (TAMMS). Forms needed by units

maintaining this material are listed in Appendix A.

DESTRUCTION OF ARMY MATERIEL TO PREVENT ENEMY US E

See the following technical manuals for information on destruction of army materiel:

TM 750-244-2 Procedures for Destruction of Electronics Materiel to Prevent Enemy

use.

TM 750-244-5-1 Procedures for Destruction of Conventional ammunition and Improved

Conventional Munitions to Prevent Enemy Use.

TM 750-244-6 Procedures for Destruction of Tank Automotive Equipment to Prevent

Enemy Use.

TM 750-244-7 Procedures for Destruction of Equipment in Federal Supply Classifications 1000, 1005, 1010, 1520, 2530, 5590, 5595 to Prevent Enemy

use.

PREPARATION FOR STORAGE OR SHIPMEN T

See MIL-C-45360F(AT) for information about administrative storage or shipment of the M113A2 Family of

Vehicles (FOV) and their components. See the -10 for information about transportability of carriers.

1-8 Change 3
TM 9-2350-261-20-1 

NOMENCLATURE CROSS REFERENCE LIS T

This listing includes nomenclature cross references used in this manual.

COMMON NAME

Adapter

Air vent, personnel

Arming device, remote

ATTCS/CHS

Auxiliary reservoir

Battery, TOW

Bilge pump

Breather

Bulb

Chassis assembly, gunner’s

level/nightsight controls

Cleaning solvent

Coolant gage

Detector

Digital message device

Dipstick

Dispenser, smoke grenade

Drain plug

Driver’s periscope

Engine head bolt wrench

Engine oil falter

Engine oil gage

Exhaust collector

Fastener

Fiber optics

Fire bottle

Fluid level detector

Fuel control cable

Fuel falter

Fuel gage

Fuel tank

Gear box

Grease fitting

Ground/vehicular laser locator

designator (G/VLLD or GLLD)

Hand brake

Hatch

Hatch, gunner’s cupola, turret

OFFICIAL NOMENCLATURE

Nipple, pipe, union

Register, metal: personnel air

vent

Remote control system: arming

assembly

Army Tactical Command and Control

System/Common Hardware System

Auxiliary reservoir: below

deck hydraulic

Battery assembly, storage

Rotary pump

Air filter intake

Incandescent lamp

Indicator, level, gunner’s

Chlorathane solvent

Temp indicator

Liquid transmitter

Message device, digital,

AN/PSG-50

Liquid level gage rod

Grenade launcher

Pipe plug

Periscope, M17

Spanner wrench

Fluid pressure falter

Dial pressure gage

Exhaust connection

Toggle pin

Fiber optic LAN/Thin LAN

Compression gas cylinder

Liquid transmitter

Fuel control

Fluid falter

Liquid quantity gage

Fuel compartment

Mechanical housing

Lubrication fitting

Target designator set,

electro-optical AN/TVQ-2

Parking brake lever

Hatch cover

Hatch, vehicular: gunner’s

cupola

Change 3 1-9
TM 9-2350-261-20-1 

NOMENCLATURE CROSS REFERENCE LIST (con’t )

COMMON NAME

Head assembly, upper

Hinge pin

Horn switch

Hub

Hydraulic power unit

Image transfer assembly

Indicator, level position, driver’s

Infrared (IR) periscope

Indicator light

Inlet grill

Jack

Jam nut

Key washers

Laser designator/rangefinder

(LD/R)

Link

Locknut

Lock screw

Lockwasher

Lockwire

M25A1 mask

Machine gun, mounting

assembly

Nightsight (M901A1)

Nightsight mount

Periscope, squad leader’s

Assembly

Plug

Propeller shaft

Quick disconnect

Radio

Road wheel

Screen

screw

Seatbelt

shim

Shim pack

SICPS

Slave cable

Splined shaft

Starter switch

OFFICIAL NOMENCLATURE

Head assembly: tank periscope

Headless straight pin

Push switch

support

Ramp power unit

Periscope, tank

Level indicator assembly:

driver’s

Periscope, M19

Indicator lamp

Intake grill

Receptacle

Hexagonal nut

Locking plates

Rangefinder-target designator,

laser MX-9759/TVQ-2

Plain rod bearing

Self-locking nut

Self-locking bolt

Self-locking washer

Non-electrical wire

Mask chemical-biological:

tank M25A1

Mount, secondary weapon

Sight, vision, night,

AN/TAS-4A infrared

Adapter, transversing unit

to AN/TAS-4

Telescope, panoramic, tank

vehicle

Adapter assembly

Connector

Flexible drive shaft

Quick coupling half

Receiver-transmitter

Solid rubber wheel

connecting link

Metal grill

Machine bolt

Vehicular safety belt

Spacer

Spacer assortment

Standardized Integrated

Command Post System (M1068)

Adapter cable assembly

Output carrier

Interlock switch

1-10 Change 3

Rod 
TM 9-2350-261-20-1

NOMENCLATURE CROSS REFERENCE LIST (con't)

COMMON NAME OFFICIAL NOMENCLATURE

Stop light Taillight

Stowage box Vehicular accessory box

Strut assembly, hold open, Latch assembly, cupola:

Gunner’s hatch Gunner’s hatch external

Switch Circuit breaker

Throttle control cable Throttle control

Tie strap Electric tiedown strap

Towing pintle Pintle hook latch

Turn signal assembly Vehicle directional light

Universal joint Universal joint spider

Vision block, cupola Block, direct vision

Vehicle power cable Cable, vehicle, W2

REPORTING OF EQUIPMENT IMPROVEMENT RECOMMENDATONS (EIR)

If your carrier needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell

us what you don’t like about your equipment. Let us know why you don’t like the design. Put it on an SF 368

(Quality Deficiency Report). Mail it to Commander, U.S. Army Tank-automotive and Armaments Command,

Attn: AMSTA-TR-QCL, Warren, MI 48397-5000. We’ll send you a reply.

Change 4 1-11
TM 9-2350-261-20-l

Section II. EQUIPMENT DESCRIPTION AND DATA

For equipment characteristics, capabilities, and features, see your -10.

LOCATION AND DESCRIPTION OF MAJOR COMPONENTS

The major components that are connected together to form the carrier’s power train are:

1. Engine - 6V53 diesel (1) provides source of power.

2. Transfer gearcase (2) transfers engine power to the transmission (3).

3. Transmission (3) automatically selects (depending on range selected) correct gear based on road and load

conditions.

4. Drive shaft (4) connects transmission (3) to differential (5).

5. Drive shafts (6) connect differential (5) to the left and right final drives.

6. Differential (5) steers and brakes the carrier.

7. Final drives (7) drive the track sprockets (8).

8. Sprockets (8) drive the tracks on which the carrier moves.

1-12
TM 9-2350-261-20-1 

DIFFERENCES BETWEEN CARRIERS

This manual covers nine different carriers. The major differences can be determined from the chart below.

Minor differences are described under SCOPE in each chapter or section.

DIFFERENCES BETWEEN CARRIERS

Carrier function M113A2 M577A2 M106A2 M125A2 M741A1 M1059 M901A1 M1064 M1068

Command Post — X — — — — — — X

Gun Carrier X — — — —

Mortar Carrier — X X — — — X —

Personnel/Cargo X — — — — — — — —

Smoke Generator — — X — — —

Combat Vehicle — — — — X X —

Armament and fire control:

Caliber .50 machine gun X — X X — X — X —

Caliber 7.62 machine gun — — X — —

81-mm Mortar — X — — — — —

107-mm Mortar , X — — — — — —

120-mm Mortar — — x —

Periscope M17 X X X X X X X X X

Periscope, squad leader’s X — —

Nightsight, AN/TAS-4 — X — —

Guide missile launcher

optical sight — X — —

TOW 2 missile launcher — — — X — —

Auxiliary equipment:

Air grille curtain — X X X — — X —

Artillery communioation kit — X — — — — — — X

ATCCS common hardware — — — X

Capstan kit X — — — — X X — —

Chemical agent automatic

alarm kit X — — — — — x — —

Driver’s windshield kit X X X X X X X X X

Electronic equipment heater kit — X — — — — — — –

Engine heater coolant kit X X X X X X X X X

Fiber optics — X

Generator set and cover X — — — — — — X

Litter kit X — — — — – – – –

Machine gun armor shield kit X — X X — X — X —

Marine recover kit X — — — — X X — –

NBC mounting kit X X X X — — — X X

Non-skid ramp kit X X — — — X —

Personnel heater kit X X X X X X X X X

Smoke grenade launcher kit X — — — — X X – –

Tent (covered extension) — X — — — — — — X

Turn signal kit X — — — —

Change 3 1-13
TM 9-2350-261-20-1 

EQUIPMENT DAT A

Engine

Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Number of cylinders . . . . . . . . . . . . . . . . . . . . . . . . .

Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Piston displacement. . . . . . . . . . . . . . . . . . . . . . . . . .

Compression ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Injectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Crankshaft rotation (viewed

at pulley) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Compression pressure (minimum)

speed 600 rpm, injectors

removed) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Firing order

Cylinder numbering left bank

(front-to-rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cylinder numbering right bank

(front-to-rear) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Governed speed (no load) with quick

disconnect engaged . . . . . . . . . . . . . . . . . . . . . . . . .

Horsepower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lubrication (type) . . . . . . . . . . . . . . . . . . .

Lubrication pressure (normal

at 2800 rpm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lubricating pump type . . . . . . . . . . . . . . . . . . . . . .

Stall speed (2-3 range) . . . . . . . . . . . . . . . . . . . . .

Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dry weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Characteristics Metric Equivalents

Detroit Diesel Engine Division — GMC

5063-5299

6V53

two-cycle diesel compression-ignition

6

3.875 in. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 cm

4.5 in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 cm

318cu/in . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2 liters

21:1

M50

clockwise

510 psi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3516 kPa

lL-3R-3L-2R-2L-lR

lL-2L-3L

1R-2R-3R

650 to 700 rpm

2925 to 2975 rpm

212

forced feed

40-60 psi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276 to 414 kPa

rotary

1900 to 2100 rpm

overhead, rocker arm

1345 lb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 611 kg

1-14
Suspension

Torsion bars

Shock absorbers, hydraulic,

direct action. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Shock absorbers, hydraulic,

direct action. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Road arm bumpers . . . . . . . . . . . . . . . . . . . . . . . . . .

Lockout cylinders . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Support assembly guards . . . . . . . . . . . . . . . . . . .

Idler wheels, unmatched . . . . . . . . . . . . . . . . . . . .

Idler wheels, matched . . . . . . . . . . . . . . . . . . . . . . .

Sprockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Idler assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Road wheels:

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Quantity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Support assembly, road wheel . . . . . . . . . . . . .

Track, flat, single pin, hinged

(removable rubber pads)

Model . . . . . . . . . . . . . . . . . . . . . . ....... . . . . . . . . . .

Tread (centerline to centerline

of tracks). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Number of shoes (new) . . . . . . . . . . . . . . . . . . . .

Width . . . . . . . . . . . . . ........ . . . . . . . . . . . . . . . . . .

Tension (between track and 2nd

road wheel) . . . . . . . . . . . . . . . . . . . . . . .

Characteristics

5 each side

TM 9-2350-261-20-1 

Metric Equivalents

3 each side (all except M741A1)

1 each side (M741A1 only)

1 each side (M741A1 only)

4 each side (M741A1 only)

3 each side (all except M741A1)

2 each side (all except M741A1)

2 each side (M741A1)

2 each side

1 each side

disk with solid rubber tires

20 (10 duals)

24 in. dia x 2 1/8 in. wide . . . . . . . . . . . . . . . 61 cm dia x 5 cm

wide

5 each side

T130E1 6 in. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 cm pitch

85 in . . . . . . . . . . . . . . . . . . . . . . . ...... . . . . . . . . . . . 216 cm

63 left side

64 right side

15 in. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... 38 cm

1/2 in. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 mm

1-15

 Type 
TM 9-2350-261-20-1

Electrical System

Batteries

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ,

Voltage (two 12-volt . . . . . . . . . . . . . . . . . . . . . . .

in series)

Generator 100 AMP

Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Generator 200 AMP

Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Generator 200 AMP

Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Generator 200 AMP

Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Starter

Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional manufacturer . . . . . . . . . . . . . . . . . . . . .

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Optional manufacturer . . . . . . . . . . . . . . . . . . . . .

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Brushes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 

Rotation (viewed from drive

end) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Type of engagement . . . . . . . . . . . . . . . . . . . . . . .

Internal wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Engine low oil pressure switch

(transmitter) breaks contact at . . . . . . . . . . .

Differential high oil temperature

switch (transmitter) closes at . . . . . . . . . . . .

Transmission high oil temperature

switch (transmitter) closes at . . . . . . . . . . . .

1-16

Characteristics

6TN

24 V dc

Leece Neville

2184AC

Leece Neville

226OAC

Prestolite

AMZ-4000

Niehoff

N1205

Delco Remy Division GMC

16764-11663416 (MS53011-4)

Prestolite

11668641 (MS50311-4)

Leece Neville

12253404 (MS53011-4)

4-pole, 24 V dc

8

Metric Equivalent

24 V dc

clockwise

shift lever solenoid plunger

series

9-13 psi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62-90 kPa

305° F + 5° . . . . . . . . . . . . . . . . . . . . . ... . . . 152° C

305° F + 5° . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152° C
TM 9-2350-261-20-1 

Cooling System Characteristics Metric Equivalents

Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... 14 gal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 liters

Thermostat (closed) . . . . . . . . . . . . . . . . . . . . . . . . . . 174-176° F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79-80° C

(open) . . . . . . . . . . . . . . . . . . . . . . . . . . 190-192° F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88-89° C

Normal operating temperature

(engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160-230° F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71-110° C

Radiator cap (auxiliary tank)

pressure rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-18 psi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90-124 kPa

Transfer Gearcase Characteristics Metric Equivalents

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . four helical gears w/power

takeoff

Transfer ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1:1.286

Dry weight . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. 118 lb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54 kg

Transmission Characteristics Metric Equivalents

Manufacturer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Allision Division GMC

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. TX 100-1

Hydraulic torque converter . . . . . . . . . . . . . . . . . single stage, multiple phase

w/lockup

Drive ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . reverse, neutral, 2-3, 1-3, 1-2, 1

Dry weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 309 lb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140 kg

Control Differential

Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Suspension. . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

Rating:

Input (maximum) . . . . . . . . . . . . . . . . . . .

Input (maximum) . . . . . . . . . . . . . . . . .

Net input (maximum) . . . . . . . . . . . . . . . . . . . . .

Rotation:

Input shaft (in forward range) . .. . . . . . . .

Left output shaft (in forward range) . . . .

Right output shaft (in forward

range) . . . . . . . . . . . . . . . . . . . . . . . .

Steering control (internal ) . . . . . . . . . . . . . . . . .

Bevel gear ratio. . . . . . . . . . . . . . . . . . .

Characteristics Metric Equivalents

DS200

3-point

4675 Ib-ft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6339 N·m

3825 rpm

215 hp

clockwise

clockwise

counterclockwise

mechanical brakes

1.28:1

1-17

\-A
TM 9-2350-261-20-1 

METRIC EQUIVALENTS 

Metric equivalents are used throughout this manual. Metric symbols and units are:

SYMBOL UNIT

c

cc

cm

kg

kg/min

k m

km/h

kPa

kw hr

m

Celsius

cubic centimeter

centimeter

kilogram

kilogram per minute

kilometer

kilometer per hour

kilopascal

kilowatt hour

meter

millimeter

Newton meters

EQUIPMENT DAT A

For equipment data, see your -10.

EQUIPMENT CONFIGURATION 

The equipment you will be working on may be equipped with one of several special purpose kits. These kits are:

— Artillery Communication Kit (M577A2 only) (page 37-5).

— Capstan Kit (M113A2 and M1059 only) (page 34-1).

— Chemical Agent Automatic Alarm Kit (M113A2 only) (see Chapter 2, PMCS and page 44-1).

— Driver’s Windshield Kit (all carriers) (page 30-1).

— Electronic Equipment Heater Kit (M577A2 only) (page 31-1).

— Engine Coolant Heater Kit (all carriers) (page 32-1).

— Litter Kit (M113A2 only) (page 36-1).

— Machine Gun Armor Shield Kit (page 38-1).

— Personnel Heater Kit (all carriers) (page 29-1).

1-18 Change 3

—NBC Mounting Kit (M113A2, M1068, and M577A2 only) (page 48-1).

— NBC Kit (page 17-30).

mm 

N·m 
TM 9-2350-261-20-1 

— Marine Recovery Kit (M113A2 and M1059 only) (page 35-1).

— Non-Skid Ramp Kit (M125A2, M1064, and M106A2) (page 33-1).

— Turn Signal Kit (M741A1 only) (page 39-1).

Refer to TM 9-2350-261–10, TM 9-2350-259-10 (M901A1 only), or TM 9-2350-300-10 (M741A1 only) for

operation of these kits. Also see page number referenced in this manual for description, data, and

maintenance.

CARE AND HANDLING OF AMMUNITION

For general care of the ammunition you may have on board your carrier, see TM 9-1300-206.

Change 2 1-19 (1-20 blank)
TM9-2350-261-20-1

CHAPTER 2

PRINCIPLES OF OPERATIO N

Section I. INTEGRATED SYSTEM S

SCOPE

This section describes how major systems of the carrier operate. An understanding of how each part functions

in a system and how components relate to each other will help you solve Possible maintenance problems with

the earner.

POWER PLANT

The power plant consists of the diesel engine, transfer gearcase, transmission and differential. The fuel,

exhaust, cooling, starter, generator, and engine air systems are support systems for the power plant.

DIESEL ENGINE

The diesel engine is the primary source of power for the earner. The engine converts air and diesel fuel into

energy and delivers this power to the transfer gearcase.

STARTER

The engine is equipped with a heavy duty starter. The starter, with built-in solenoid, is used to crank the

engine for starting.

GENERATOR

The generator is part of the carrier electrical system. It is driven by the transfer gearcase. The generator

charges the batteries in the carrier when the engine is running. A regulator mounted in the driver’s

compartment keeps the voltage at correct levels.

GENERATOR FIELD SWITCH

The generator switch is mounted on the secondary fuel filter. When starting the engine the field switch is open

and the generator is not energized to allow the engine to start with less drag. When the secondary fuel filter is

pressurized with fuel, the field switch closes and signals the regulator to energize the generator and start

charging the batteries.

2-1
TM 9-2350-261-20-1

OIL SYSTEM

The engine, transmission, and differential oil cooling system keeps the oil clean and within proper operating

temperature range. The components of the system and their fictions are:

Engine, transmission, and differential oil cooler unit is mounted on the engine. By circulating the hot oil

through this unit, heat is given off to the surrounding engine coolant. Engine coolant is in turn cooled by the

engine cooling system.

Oil cleanliness is maintained by circulating engine oil through the engine oil filter, and differential oil through

the differential oil filter. Transmission oil is cleaned by the transmission oil filter which is an integral part of

the transmission.

Differential oil pump is mounted on the transfer gearcase. It pumps oil from the bottom of the differential

housing and to the differential oil filter. Oil flows through the filter, cooler, and back to the top of the

differential.

FUEL SYSTEM

Diesel fuel is stored in the fuel tank located inside the carrier. Fuel is gravity fed to the primary fuel filter. The

engine driven fuel pump draws fuel from the primary fuel filter and pumps fuel through the secondary fuel

filter to the engine injectors. The injectors force fuel into combustion cylinders where it is mixed with air and

changed into energy. The excess fuel is returned to the fuel tank.

External fuel tanks are mounted on rear of carrier and hold about 95 gallons of diesel fuel. Shutoff cocks are

located inside of earner at each connection. Turn fuel on and off for maintenance (M981 only).

TRANSFER GEARCASE

The transfer gearcase transfers power from the engine to the transmission. The transfer gearcase is a

compact unit that transfers power from the engine flywheel to transmission torque converter. An engine

disconnect allows the engine to run without transferring power to the transmission. A power takeoff drives the

differential oil pump and a ramp pump. Another power takeoff drives the cooling fan, and a third drives the

generator.

2-2
TM 9-2350-261-20-1

TRANSMISSION

The transmission is a three speed, constant mesh, planetary gear train with hydraulic torque converter and

lockup clutch. It automatically selects the proper gear based on road and load conditions. The transmission

delivers power from the transfer gearcase to the differential.

EXHAUST SYSTEM

Major exhaust system parts are the exhaust manifolds, and muffler. The exhaust manifolds carry the exhaust

gases to the muffler. The muffler cuts down engine noise and allows exhaust to escape outside the carrier.

COOLING SYSTEM

The cooling system cools the engine and transmission. It consists of a fan, fan drive belts, radiator, coolant

pump, auxiliary tank, transmission oil cooler and thermostats. The cooling system contains approximately 14

gallons of liquid coolant. The liquid coolant is pumped by the coolant pump from the radiator and circulated

through the engine and thermostat and back to the radiator where it loses heat to the atmosphere. This

process keeps the engine, transmission, and differential temperature in a safe operation range.

As coolant flows through the engine, it absorbs heat from the engine and transmission. The heated coolant

then flows to the radiator to remove coolant heat. The coolant fan pulls outside air in and through the radiator

to remove heat. The fan is powered by the transfer gearcase.

The radiator auxiliary tank acts as an overflow tank to keep the cooling system from overpressurizing. It also

removes air from the engine coolant.

ENGINE AIR SYSTEM

The engine air system allows air to enter the engine. The air cleaner cleans air that enters the engine. Air is

filtered through a reusable filter element before delivery to the engine. An air filter indicator shows when the

element is clogged and needs cleaning or replacing. After being filtered, the air moves through the air horn and

into the engine cylinders.

2-3
TM9-2350-261-20-1

AUXILIARY AUTOMOTIVE SYSTEM

The auxiliary system includes driver controls, personnel heater, bilge pumps, crew ventilation system, and fire

suppression system.

DRIVER CONTROLS

The driver controls regulate the engine, transmission, and steering braking systems of the earner.

The fuel shutoff control is used to stop the supply of fuel to the injectors. To start the engine, the driver must

push in the fuel shutoff control. The throttle linkages are used to control the engine speed. The gear selector

allows the driver to choose the proper gear for the carrier. The steering and braking levers control separate

right and left steering brakes in the control differential. By pulling on the levers, you can slow or stop either

track for steering, or both tracks at once for stopping. A lock button at the top of each lever lets you set and

lock the brakes for parking.

PIVOT STEERING AND BRAKES

Pivot steer brakes are disk brakes and work like the differential brakes but quicker.

DIFFERENTIAL COMPONENTS

The differential consists of three major assemblies. These are the right angle gearbox, stewing unit with brake

shoes, and two output shafts.

Power flow is from the transmission to the right angle gearbox to the steering unit.

When driving straight forward the steering unit delivers equal power to both output shafts. Pressure on either

steering lever slows or stops the right or left brake drum, inside the center steering unit, and reduces the speed

of the right or left output shaft. By slowing down on one side you increase the speed of the other and the earner

will turn in the direction of the applied brake.

2-4
TM9-2350-261-20-1

Equal pressure on both steering levers applies both brakes and slows or stops the carrier.

The differential overheat switch is connected to a warning light in the driver’s compartment. When warning

light comes on it means oil temperature is too high.

PERSONNEL HEATER

The personnel heater system provides heat inside the carrier. Major parts are the combination combustion

chamber/heat exchanger, blowers, a fuel pump, and an electrical control. The heater operates using diesel fuel

pumped from the fuel tank. Fuel is delivered to the combustion chamber from the fuel pump. Outside air is

drawn into the combustion chamber by one of the blowers. A blower draws air from the crew compartment into

the heater exchanger. The air is warmed by heat created by the combustion process and then returned to the

crew compartment.

BILGE PUMPS

Two electrically driven bilge pumps remove water and other liquids from the hull. Water enters the pumps

through a screened inlet. The pumps force water out of the carrier through outlet tubes. The bilge pumps are

controlled by a switch on the driver’s panel.

HYDRAULIC SYSTEM

The ramp is raised or lowered by an hydraulic system which consists of a pump, a cylinder, a control valve,

and an hydraulic tank. This system is controlled by a three position valve located near the driver. Moving the

valve to the RAISE position directs fluid to the ramp cylinder. Moving the valve to the LOWER position allows

the gravity of the ramp to return hydraulic fluid to the reservoir.

FIRE EXTINGUISHER SYSTEM

The fire extinguisher system consists of two CO2 (Carbon Dioxide) cylinders; one fixed and one Portable.

Carbon Dioxide can put out fires quickly and effectively. The fixed cylinder is located near the driver’s

compartment and is operated manually by pulling cables located on top of carrier next to driver’s hatch. The

fixed cylinder releases CO2 in the power plant compartment only. The portable fire extinguisher is located in

the crew compartment and is manually discharged.

2-6
TM9-2350-261-20-1

SUSPENSION SYSTEM

The suspension system supports the carrier and delivers engine power to the road. It allows the carrier to

maneuver and be stable. Suspension system parts are the drive sprockets, tracks, idler wheels, track tension

adjuster, road wheels, and support arms. Also, there are torsion bars and shock absorbers. The M741A2 has

lockout cylinders to stabilize the carrier during operation of the weapon.

The drive sprockets drive the tracks. They are powered by left and right final drives from differential. The

tracks consist of two flexible chains of track shoes. The tracks ride on the drive sprockets and are guided by the

road wheels and idler wheels. The idler wheels can be adjusted to maintain correct track tension.

There are five pairs of road wheels per side. Track centerguides fit between each pair of road wheels. Road

wheels and torsion bars are connected to support inns. The torsion bars act as springs to keep the road wheels

on the ground and from hitting the bottom of the carrier.

ELECTRICAL SYSTEM

The electrical system provides power for the carrier. The system operates on wet cell batteries and includes

charging, regulating, and monitoring equipment. The batteries provide a normal operating 24 volts with an

amperage capability of 100 or 200 amps per hour (depending on the system installed).

The batteries supply the carrier with electricity when the engine is off. All electrical power is delivered through

the distribution box. Electrical power flows from the batteries through the distribution box, cables, and wiring

assemblies to the electrical equipment. The hull is a ground for the electrical system.

The generator recharges the batteries and supplies electricity while the engine is running. The generator has

100 or 200 amps per hour capability (depending on the system installed).

There are several electrical subsystems within the hull. Each subsystem contains at least one wiring

assembly. Major electrical subsystems and assemblies are:

Interior and Exterior Lights. Exterior lights include blackout lights, stop light, and headlights. Interior lights

include domelights and panel lights.

2-6
TM9-2350-261-20-1

Starting and Charging. A generator with a regulator keeps batteries charged to operating voltage. A starter

with a built-in solenoid is used to crank the engine for starting.

Ventilation and Heating. Fresh air for the crew is provided by a vent aft of the cargo hatch. The M577A2 has

a compartment blower to exhaust air from inside the M577A2 into the power plant compartment. Heating is

provided by a forced air heater.

Bilge Pumps. Two pumps, one in the front and one in the rear of the earner, remove any water that may have

entered the carrier.

SPECIAL EQUIPMENT

Chemical Agent Automatic Alarm Kit (see Chapter 2, PMCS and page 44-1).

Driver’s Windshield Kit (page 30-1).

Engine Coolant Heater Kit (page 32-1).

Litter Kit (page 36-1).

Machine Gun Armor Shield Kit (page 38-1).

NBC Kit (page 17-30).

NBC Mounting Kit (page 43-1).

Personnel Heater Kit (page 29-1).

Change 3 2-7
TM 9-2350-261-20-1

Section II. INTEGRATED COMPONENT S

SCOPE

This section has important information on how the major components that makeup a earner operate. You’ll be

working on these components and gain an understanding of just how each relates to the other and how they

will help you solve many maintenance problems.

Study this information and its illustrations closely. It will help you to know the major components and their

parts.

MAJOR COMPONENTS

 There are three major integrated components used in all of the vehicles. These three major components are:

Power plant components

Differential suspension

Tracks and suspension.

Special purpose kits, when installed, provide their own integrated components. Integration of these kits is

description in their respective chapters.

2-8 Change 3
TM9-2350-261-20-1

POWER PLANT COMPONENTS

The power plant consists of three main components:

Engine (1) is a liquid cooled, V-type, six cylinder, compression ignition (CI) unit. Starting is by a heavy duty

24 volt starter (2). Engine is protected from low oil pressures and high temperatures by switches in the oil and

cooling systems which activate warning light circuits.

Transfer gearcase (3) is a compact unit that transfers power from engine flywheel to transmission torque

converter. An engine disconnect allows the engine to run without transferring power to the transmission. A

power takeoff drives the differential oil pump (4) and a ramp pump (5). Another power takeoff drives the

cooling fan (6), and a third drives the generator (7).

Transmission (8) is a three speed, constant mesh, planetary gear train with hydraulic torque converter and

lockup clutch. It automatically selects the proper gear based on road, load conditions, and range selected.

2-9
TM9-2350-261-20-1

DIFFERENTIAL COMPONENTS

The differential consists of three major assemblies. These are the right angle gearbox (1), steering unit with

brake shoes (2), and two output shafts (3).

Power flow is from the transmission to the right angle gearbox (1) to the steering unit (2).

When driving straight forward the steering unit (2) delivers equal power to both output shafts (3). Pressure on

either steering lever slows or stops the right or left brake drum, inside the center steering unit (2), and reduces

the speed of the right or left output shaft (3). By slowing down one side you increase the speed of the other and

the carrier will turn in the direction of the applied brake.

Equal pressure on both steering levers applies to both brakes and slows or stops the earner.

The differential overheat switch (4) is connected to a warning light in driver’s compartment. When warning

light comes on it means oil temperature is too high.

2-10
TM 9-2360-261-20-1

OIL COOLING SYSTEM COMPONENTS — ENGINE, TRANSMISSION, AND

DIFFERENTIAL

The engine, transmission and differential oil cooling system keeps the oil clean and within proper operating

temperature range. The components of the system and their functions are:

Engine, transmission, and differential oil cooler unit (1) is mounted on the engine. By circulating the hot oil

through this unit, heat is given off to the surrounding engine coolant. Engine coolant is in turn cooled by the

engine cooling system (page 2-3).

Oil cleanliness is maintained by circulating engine oil through the engine oil filter (2), and differential oil

through the differential oil filter (3). Transmission oil is cleaned by the transmission oil filter which is an

integral part of the transmission.

Differential oil pump (4) is mounted on the transfer gearcase. It pumps oil from the bottom of the differential

housing and to the differential oil filter (3). Oil flows through filter (3), through cooler (1),and back to top of

differential (5).

2-11
TM9-2350-261-20-1

TRACKS AND SUSPENSION COMPONENTS

The earner moves on its tracks and suspension system. The components and their function are:

Road wheels (1), 10 to each side, carry the weight of the earner.

Road wheel arms (2), five to each side, are splined to individual torsion bars to suspend the carrier.

Torsion bars (3), one for each mad wheel arm, extend the width of the carrier and are firmly anchored to the

hull on the side opposite its road wheel arm.

Tracks (4), on each side, consist of track shoes with rubber pads. Shoes are linked together by pins to form a

continuous rolling surface for the road wheels. Track guides keep track centered on the road wheels.

Sprockets (5), mounted on each final drive, power the tracks.

Idler wheels (6), pushed rearward by track adjusters (7), keep the track under tension.

Shock absorbers (8) at first, second, and fifth wheel positions stabilize the carrier.

NOTE

See page 20-47 for M741A1 lockout suspension system.

2-12
TM9-2350-261-20-1

ELECTRICAL SYSTEM (M113A2 AND M1059 ONLY)

The electrical system is designed to sense pressures and temperatures, activate panel indicators, and generate

and store electrical energy.

The components and their functions are:

Batteries (1) store a supply of 24 V dc power.

Generator (2) supplies 24 V dc power for the system.

Regulator (3) controls voltage output of the generator.

Starter (4) cranks the engine.

Master switch panel (5) connects electrical power from the batteries to the system. Panel is main junction

point for the main harnesses and circuit breakers. Heaters are wired direct to batteries.

Instrument panel (6) contains gages and switches necessary to control carrier.

Warning light panel (7) indicates overheating or low oil pressure in major components of power plant.

Wiring harnesses (8) distribute power to engine, transmission, differential, and other components.

Headlights (9) are used for night vision.

NOTE

See fold outs (FO-1 and FO-2) in the rear of

TM for wiring diagram.

2-13
TM9-2350-261-261-20-1

ELECTRICAL SYSTEM (M113A2 AND

Blackout marker lights (1) and blackout headlight

Horn (3) is used to alert traffic and personnel.

M1059 ONLY) (cont)

(2) are used for driving in blackout conditions.

High beam selector switch (4) raise or lowers light beams.

Infrared power pack (5) power M19 periscope.

Bilge pumps (6) keep bilge clear of water.

Fuel quantity sending unit (7) measure amount of fuel in tank.

Trailer receptacle (8) supplies electrical power to a towed trailer.

Stop lights (9) indicate brake is on. Tail lights (9) illuminate rear of earner at night.

Dome lights (10) provide night vision inside carrier.

Electrical transient suppressor (11) protects communication system from transients induced by

starter. The electrical transient suppressor also protects the system from accidental reversal of power

Smoke grenade arming firing unit (12) contains controls for arming and firing smoke

NOT E

See fold outs (FO-1 and FO-2) in the rear of

TM for wiring diagram.

grenades.

engine

 leads.

2-14
ELECTRICAL SYSTEM (M901A1 ONLY)

The electrical system is designed to sense pressures and temperatures, activate panel indicators, and generate

and store electrical energy.

The components and their functions are:

Batteries (1) store a supply of 24 V dc power.

Generator (2) supplies 24 V dc power for the system.

Regulator (3) controls voltage output of the generator.

Starter (4) cranks the engine.

Master switch panel (6) connects electrical power from the batteries to the system. Panel is

point for the main harnesses and circuit breakers. Heaters are wired direct to batteries.

Instrument panel (6) contains gages and switches necessary to control carrier.

Warning light panel (7) indicates overheating or low oil pressure in major components of

main junction

power plant.

Wiring harnesses (8) distribute power to engine, transmission, differential, and other components.

Headlights (9) are used for night vision.

NOT E

See foldout (F04) in the rear of TM for

wiring diagram.

2-15

TM9-2350-261-20-1 
TM9-2350-261-20-1

ELECTRICAL SYSTEM (M901A1 ONLY) (cont)

Blackout marker lights (1) and blackout headlight (2) are used for driving in blackout conditions.

Horn (3) is used to alert traffic and personnel.

High beam selector switch (4) raise or lowers light beams.

Inbred power pack (5) power periscope.

Bilge pumps (6) keep bilge clear of water,

Fuel quantity sending unit (7) measure amount of fuel in tank.

Trailer receptacle (8) supplies electrical power to a towed trailer.

Stop lights (9) indicate brake is on. Tail lights (9) illuminate rear of carrier at night.

Dome lights (10) provide night vision inside carrier,

Electrical transient suppressor (11) protects communication system from transients induced by engine

starter. The electrical transient suppressor also protects the system from accidental reversal of power leads.

Smoke grenade arming firing unit (12) contains controls for arming and firing smoke grenades.

Proximity switch (13) indicator will identify open or closed hatches.

NOTE

See foldout (FO-6) in the rear of TM for

2-16

wiring diadram
TM9-2350-261-20-1

ELECTRICAL SYSTEM (M577A2 ONLY)

The electrical system is designed to sense pressures and temperatures, activate panel indicators, and generate

and store electrical energy.

The components and their functions are:

Batteries (1) store a supply of 24 V dc power.

Generator (2) supplies 24 V dc power for the system.

Regulator (3) controls voltage output of the generator.

Starter (4) cranks the engine.

Master switch panel (5) connects electrical power from batteries to the system. Panel is main junction point

for the main harnesses and circuit breakers. Heaters are wired direct to batteries.

Instrument panel (6) contains gages and switches necessary to control carrier.

Warning light panel (7) indicates overheating or low oil pressure in major components of power plant.

Wiring harnesses (8) distribute power to engine, transmission, differential, and other components.

Headlights (9) are used for night vision.

Blackout marker lights (10) and blackout

See foldout

headlight (11) are used for driving in blackout conditions.

NOT E

(FM) in the rear of TM for

wiring diagram.

2-17
TM9-2350-261-20-1

ELECTRICAL SYSTEM (M577A2 ONLY) (cent)

Horn (1) is used to alert traffic and personnel.

High beam selector switch (2) raise or lowers light beams.

Infrared power pack (3) power periscope.

Bilge pumps (4) keep bilge clear of water.

Fuel quantity sending unit (5) measure amount of fuel in tank.

Trailer receptacle (6) supplies electrical power to a towed trailer.

Stop lights (7) indicate brake is on. Tail lights (7) illuminate rear of earner at night.

Dome lights (8) provide night vision inside earner.

Utility outlet (9) provide 24 V dc power for accessories and the tent lighting.

Communication receptacles (10) provide power for radio and telephone lines.

.

Ramp door switch (11) automatically turns on blackout dome lights when ramp is down or ramp is open.

Generator set power receptacle (12) provides power outlet for lights and communication equipment.

Blower (13) provides forced air circulation to vent personnel compartment.

NOT E

See foldout (FO-3) in the rear of TM for

wiring diagram.

2-18
TM9-2350-261-20-1

ELECTRICAL SYSTEM (M1068 ONLY)

The electrical system is designed to sense pressures and temperatures, activate panel indicators, and generate

and store electrical energy.

The components and their functions are:

Batteries (1) store a supply of 24 V dc power.

Generator (2) supplies 24 V dc power for the system.

Regulator (3) controls voltage output of the generator.

Starter (4) cranks the engine.

Master switch panel (5) connects electrical power from batteries to the system. Panel is main junction point

for the main harnesses and circuit breakers. Heaters are wired direct to batteries.

Instrument panel (6) contains gages and switches necessary to control earner.

Warning light panel (7) indicates overheating or low oil pressure in major components of power plant.

Wiring harnesses (8) distribute power to engine, transmission, differential, and other components.

Infrared headlights (9) are used

Blackout marker lights (10) and

for night vision.

blackout headlight (11) are used for driving in blackout conditions.

NOTE

foldouts (FO-9, FO-10, and FO-11) in

the rear of TM for wiring diagrams. -

Change 3 2-18.1

See 
TM9-2350-261-20-1

ELECTRICAL SYSTEM (M1068 ONLY) (cont)

Horn (1) is used to alert traffic and personnel.

High beam selector switch (2) raise or lowers light beams.

Infrared power pack (3) power periscope.

Bilge pumps (4) keep bilge clear Of water.

Fuel quantity sending unit (5) measure amount of fuel in tank,

Trailer receptacle (6) supplies electrical power to a towed trailer.

Stop lights (7) indicate brake is on. Tail lights (7) illuminate rear of carrier at night.

Dome lights (8) provide night vision inside carrier.

 Fluorescent lights (9) provide working light.

Utility outlet (10) provide 24 V dc power for accessories and the tent lighting.

Communication receptacles (11) provide power for radio and telephone lines.

Ramp door switch (12) automatically turns on blackout dome lights when ramp is down or ramp is open.

Generator set power receptacle (13) provides

Blower (14) provides forced air circulation to

power outlet for lights and communication equipment.

vent personnel compartment.

NOTE

See fold out (FO-9, FO-10, and FO-11) in

the rear of TM for wiring diagrams.

2-18.2 Change 3
TM9-2350-261-20-1

ELECTRICAL SYSTEM

The electrical system is designed

and store electrical energy.

(M125A2, M106A2, AND M1064 ONLY)

to sense pressures and temperatures, activate panel indicators, and generate

The components and their functions are:

Batteries (i) store a supply of 24 V dc power.

Generator (2) supplies 24 V dc power for the system.

Regulator (3) controls voltage output of the generator.

Starter (4) cranks the engine.

Master switch panel (5) connects electrical power from the batteries to the system. Panel is main junction

point for the main harnesses and circuit breakers. Heaters are wired direct to batteries,

Instrument panel (6) contains gages and switches necessary to control carrier.

Warning light panel (7) indicates overheating or low oil pressure in major components of Power Plant.

Wiring harnesses (8) distribute power to engine, transmission, differential, and other components.

NOT E

See foldout (FO-4) and (FO-8) in the rear of

TM for wiring diagram.

Change 2 2-19
TM 9-2350-261-20-1

 ELECTRICAL SYSTEM (M125A2, M106A2, AND M1064 ONLY) (cont)

Headlights (1) are used for night vision.

Blackout marker lights (2) and blackout headlight (3) are used for driving in blackout conditions.

Horn (4) is used to alert traffic and personnel.

High beam selector switch (5) raise or lowers light beams.

Infrared power pack (6) power periscope.

Bilge pumps (7) keep bilge clear of water.

NOTE

M1064 fuel quantity sending unit is in external fuel tanks.

Fuel quantity sending unit (8) measure amount of fuel in tank.

Trailer receptacle (9) supplies electrical power to a towed trailer.

Stop lights (10) indicate brake is on. Tail lights (10) illuminate rear of carrier at night.

Dome lights (11) provide night vision inside earner.

NOTE

See foldout FO-4 and FO-8 in the rear of TM

for wiring diagram.

2-20 Change 2
TM9-2350-261-20-1

ELECTRICAL SYSTEM (M741A1 ONLY)

The electrical system is designed to sense pressures and temperatures, activate panel indicators, and generate

and store electrical energy.

The components and their functions are:

.

Batteries (1) store a supply of 24 V dc power.

Generator (2) supplies 24 V dc power for the system.

Regulator (3) controls voltage output of the generator.

Starter (4) cranks the engine.

Master switch panel (5) connects electrical power from the batteries to the system. Panel is

point for the main harnesses and circuit breakers. Heaters are wired direct to batteries.

Instrument panel (6) contains gages and switches necessary to control carrier.

Warning light panel (7) indicates overheating or low oil pressure in major components of

main junction

power plant.

Wiring harnesses (8) distribute power to engine, transmission, differential, and other components.

Headlights (9) are used for night vision.

Blackout marker lights (10) and blackout

See foldout

headlight (11) are used for driving in blackout conditions.

NOTE

(FO-6) in the rear of TM for

wiring diagram.

2-21
ELECTRICAL SYSTEM (M741A1 ONLY) (cont)

Horn (1) is used to alert traffic and personnel.

High beam selector switch (2) raise or lowers light beams.

Infrared power pack (3) power periscope.

Bilge pumps (4) keep bilge clear of water.

Fuel quantity sending unit (5) measure amount of fuel in tank.

Trailer receptacle (6) supplies electrical power to a towed trailer.

Stop lights (7) indicate brake is on. Tail lights (7) illuminate rear of carrier at night.

Dome lights (8) provide night vision inside carrier.

Auxiliary power unit (APU) diode box (9) allows power to flow from weapon system distribution box (10) and

prevents reverse current flow.

Terminal boards (11) interconnect APU diode box with weapon system distribution box.

Weapon distribution box (10) allows power to flow from APU to carrier starter circuit and prevents reverse

current flow.

Driver’s and commander’s hatch switches (11) prevent gun from firing if either hatch is open.

NOTE

See foldout (FO-6) in the rear of TM for

2-22

TM9-2350-261-20-1

wiring diagram 
TM9-2350-261-20-1

KIT INTEGRATED SYSTEMS

When special purpose kits are installed, their systems and components become integrated with the earner’s

systems and components. For information on these kits, see:

Artillery Communication Kit (M577A2 Only) (page 37-5).

Capstan Kit (M113A2 and M1059 Only) (page 34-1).

Chemical Agent Automatic Alarm Kit (M113A2 Only) (see Chapter 2, PMCS and page 44-1).

Driver’s Windshield Kit (all carriers) (page 30-1).

Electronic Equipment Heater Kit (M577A2 only) (page 31-1).

Engine Coolant Heater Kit (all carriers) (page 32-1).

Litter Kit (M113A2 Only) (page 36-1).

Machine Gun Armor Shield Kit (page 38-1).

Marine Recovery Kit (M113A2 and M1059 Only) (page 35-1).

NBC Kit (page 17-30).

NBC Mounting Hardware Kit (M113A2, M1068, and M577A2 Only) (page 43-1).

Ramp Non-Skid Winterization Kit (M125A2, M106A2, and M1064 Only) (page 33-1).

Turn Signal Kit (M741A1 Only) (page 39-1).

Personnel Heater Kit (all carriers) (page 29-1).

Change 3 2-23
TM9-2350-261-20-1

Section III. SERVICE UPON RECEIPT OF MATERIAL

SCOPE

This section tells you how to service your carrier when it is first received from

information on administrative storage.

GENERAL INSTRUCTIONS

CAUTION

M741A1 (M163 Weapon System) suspension

will be damaged if the suspension lockout

system is locked while driving. Be sure the

suspension lockout system is NOT locked.

See your -10.

If you find anything wrong during this preliminary check, or during break-in

a depot. It also give you

period, report it to your

supervisor. These must be correct before carrier can be placed in service.

You are required to report any serious problems which appear to involve unsatisfactory design or material.

Prepare the Equipment Improvement Recommendations (EIR) using SF-368, Quality Deficiencies Report, as

stated in DA PAM 738-750.

REPROCESSING CARRIER

All new or reconditioned carriers, when first received by using soldiers, must be reprocessed. Unit mechanics

must decide if carrier has been properly prepared for service. The carrier must be in condition to perform its

assigned mission.

WARNING

Dry cleaning solvent P-D-680 is toxic and flammable. Wear protective goggles and

gloves use only in well-ventilated area; avoid contact with skin, eyes, and clothes,

and do not breathe vapors. Keep away from heat or flame. Never smoke when

using solvent; the flash point for Type I dry cleaning solvent is 100°F (38°C) and for

Type II is 138°F (50°C). Failure to do so may result in injury or death to personnel.

Remove rust-preventive coatings from all exterior surfaces. Use dry cleaning solvent (Item 13, App C).

Read DD Form 1397 (Processing and Reprocessing record for Shipment, Storage, and Issue of Vehicles and

Spare Engines). Follow precautions checked on the form. Form should be in a waterproof cover attached to one

of the headlight. A duplicate copy should be in the driver's compartment.

Read all warning tags attached to power plant components and those in the driver’s compartment. Follow

instructions on these tags.

2 - 24 Change 2.
TM9-2350-261-20-1

SPECIFIC REPROCESSING PROCEDURES

Item

1. Tiedowns and covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. Tape and protective paper . . . . . . . . . . . . . . . . . . . . . . . . . .

3. Basic issue items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. Tools and hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. Batteries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. Drain plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. Drive belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. Engine, transfer gearcase, differential

final drives, and fan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. DD Form 1397 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10. Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..... 

Action

Remove and stow covers. They are reuseable.

Do not damage covers. Check with supply

personnel about cover disposition.

Remove and discard from seats, air intake, and

exhaust grills, and all lamp lenses.

Unpack and stow on carrier (TM

9-2350-261-10, TM 9-2350-300-10, or

TM 9-2350-259-10. Report any missing items.

Clean and degrease.

Install batteries in earner

(page 13-16 or 13-18). Check electrolyte and

add distilled water as needed.

Install and tighten (pages 24-34 and 24-35).

Restore tension

Water pump (page 8-9).

Generator (page 9-29 or 9-47).

Fan (page 8-35).

Check lubricant levels. Check drain plugs and

filters for leaks (LO 9-2350-261-12,

LO 9-2350-300-13, or LO 9-2350-259-12).

Tighten all plugs and hose connections.

Check for correct viscosity. This tag should be

in driver’s compartment attached to a steering

lever or the range selector.

Fill tanks with diesel fuel (TM 9-2350-261-10,

TM 9-2350-300-10, TM 9-2350-259-10, or

TM 9-2350-266-10). Check for fuel leaks at

filler, drain cocks, drain plugs, quick

disconnects, filters, and pump.

2-25
TM9-2350-261-20-1

11. Start engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... Check immediately for fuel leaks and oil leaks

(TM 9-2350-259-10, TM 9-2350-261-10 or

TM 9–2350-300-10). Disregard smoky exhaust

for first few minutes of operation. Some

rust-preventive fuel will be in the system and

will burn along with the regular fuel.

12. Semi-annual check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Perform all semi-annual checks and service

required for your carrier (page 241).

13. Road test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See TM 9-2350-261-10, TM 9-2350-300-10, or

TM 9-2350-259-10 for proper operating

instructions. Become familiar with all controls

and instruments before you road test.

Drive a new or reconditioned carrier at least 5

to 10 miles (8 to 16 km).

Make sure carrier operates normally.

Don’t start out too fast, or drive too fast. You’ll

overload the engine or power train.

Stop at least every mile. Look for overheated

hubs, loose parts, and fuel or oil leaks.

After the road test, the earner is ready for

regular soldier use.

ADMINISTRATIVE STORAGE

Instructions for administrative storage of your earner are contained in the following documents:

Specification Applicable Carriers

MIL-C-45360G(AT) M113A2, M106A2, M125A2, M1064, & M1059

MIL-C-46746D(AT) M577A2 & M1068

MIL-C-62074C(AT) M741A1

MIL-C-62327A(AT) M901A1 TOW Vehicle (Less TOW Weapon)

2-26 Change 3
TM9-2350-261-20-1

Section IV. GENERAL MAINTENANCE INSTRUCTION S

This section contains safety warnings, guidelines, and general maintenance instructions. They should be

followed when doing maintenance procedures.

PREPARATION FOR MAINTENANCE

a. PERSONNEL SAFETY. Practice all shop safety procedures and read all warnings in this manual.

b. PROPER EQUIPMENT. Get tools and equipment before starting a maintenance task. See Chapter 2,

Section 1, TM9-2350-261-24P, and the maintenance task for tools, equipment, parts, and materials.

c. WHAT T0 DISCARD. Parts to discard, such as lock washers, locknuts, and gaskets, are listed in the

maintenance tasks. If the step does not say to discard a part, the part should be saved. It may be used

later or repaired.

d. HANDLING TECHNIQUES.

(1) Avoid damage to parts during removal, cleaning, inspection, repair, and installation procedures.

Nicks, scratches, and dents caused by careless handling could result in equipment failure.

(2) Dirt can damage parts and cause malfunctions. Make sure all air and fluid openings, lines, and hoses

ae capped or plugged during maintenance procedures.

e. IDENTIFICATION.

(1) During removal, tag parts to ensure proper assembly.

(2) During removal, tag leads on electrical parts to ensure proper assembly. Tag each lead as it is

removed.

2-27

SCOPE 
TM9-2350-261-20-1

f. TORQUING. Where needed, torque values are listed in the maintenance task. When torquing, use one of

the star pattern sequences below unless otherwise stated in the maintenance task.

2-28
TM9-2350-261-20-1

g. USE OF TORQUE WRENCH ADAPTERS AND THE CONVERSION FORMULA.

(1) Torque wrench adapters (extensions) are used to tighten screws and nuts to specific values that

cannot be reached with a regular socket on the end of a torque wrench. This makes the dial or scale

reading less than the actual torque applied to the screw or nut. When using an adapter, determine the

dial or scale reading as follows:

Step 1.

step 2.

step 3.

step 4.

step 5.

Step 6.

step 7.

Check your manual for specific torque value to which the screw or nut should be tightened.

Measure the length of your torque wrench from the center of the handle (point A) to the center of

the socket (point B). Record this measurement.

Multiply the above measurement by the desired torque. Record this product.

Measure length of adapter from socket end (point C) to screw or nut end (point D). Record this

measurement.

Add length of adapter (step 4) to the length of torque wrench (step 2). Record this sum.

Divide the product recorded in step 3 by the sum found in step 5.

The value found in step 6 is your torque wrench setting. Set your dial.

NOTE

Setting the torque wrench dial at the reading found in step 7 will deliver the required

torque at the end of your adapter.

Example:

step 1.

step 2.

step 3.

step 4

step 5.

step 6.

step 7.

Metric equivalents deleted for clarity.

40 lb-ft required.

12 inches.

12 X 40 = 480 lb-ft.

4 inches.

12+4 = 16 inches.

480= 30 lb-ft.

16

Torque wrench dial setting = 30.

 2-29
TM9-2350-261-20-1

CLEANING

a.

b.

c.

d.

e.

GENERAL. Cleaning is very important. All parts must be cleaned well and kept clean during

maintenance. Dirt or foreign matter can cause malfunctions and equipment failure. General cleaning

procedures are detailed in steps b through n. Special cleaning procedures are covered in the task relating to

the specific part.

CLEAN EVERY PART. Clean every part well after removal and before you install them. Clean parts such

as housings, covers, and dipsticks before removal. Avoid getting dirt and foreign matter in a system.

HANDLE WITH CARE. Use care when handling parts during cleaning and maintenance. Nicks,

scratches, dents, or burns can prevent proper assembly or cause malfunctions after assembly.

AVOID ABRASIVES. Except where called for in a task, don’t use abrasives, files, wire brushes, or sharp

tools. On some surfaces, finish is important to the operation of closefitting parts.

WARNING

Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area

with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do

not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy

while using solvent, breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get

medical help immediately. Keep fire extinguisher nearby.

REMOVAL AGENTS. Remove gum or old grease deposits by soaking parts in dry cleaning solvent

(Item 13, App C). Scrub with a bush. Use crocus cloth to remove minor surface defects.

WARNING

Air under pressure in excess of 30 psi (207 kpa) can injure personnel. Do not direct

pressurized at yourself or others. Always wear goggles.

CAUTION

Lye or caustic mixtures will damage metal

surfaces. Do not use lye or caustic mixtures

to clean metal surfaces.

f. STEAM CLEANING. If steam cleaning is used, dry clean parts at once with compressed air. Apply a thin

film of clean oil to surfaces that are not painted to prevent rusting. Never use lye or caustic mixtures that

will corrode or etch metal surfaces.

g. LUBRICATION OF NEW BEARINGS. See TM 9-214 for cleaning and lubrication procedures. Bearings

that have been in service should also be lubricated.

2-30
TM 9-2350-261-20-1

h. CLEANING INSTRUCTIONS. Care is needed in all cleaning procedures. Dirt can damage parts and

cause malfunctions. When you perform any cleaning procedure, do the following:

(1) Inspect and cap all air and fluid openings, lines, and hoses,

WARNIN G

Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area

with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do

not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy

while using solvent, breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get

medical help immediately. Keep fire extinguisher nearby.

(2) Clean all parts before inspection, after repair, and before assembly. Use dry cleaning solvent

(Item 13, App C) or approved cleaner. Dry parts with wiping rag (Item G1, App C).

WARNIN G

Air pressure in excess of 30 psi (207 kpa) can injure personnel. Do not direct

pressurized air at yourself or others. Always wear goggles.

CAUTION

Lye or caustic mixtures will damage metal

surfaces. Do not use lye or caustic mixtures

to clean metal surfaces.

(3) Keep hands free of grease; grease collects dirt.

(4) After cleaning, cover or wrap parts to protect from dirt.

i. CASTINGS.

WARNIN G

Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area

with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do

not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy

while using solvent, breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get

medical help immediately. Keep fire extinguisher nearby.

WARNIN G

Air pressure in excess of 30 psi (207 kpa) can injure personnel. DO not direct

pressurized air at yourself or others. Always wear goggles.

2-31
TM9-2350-261-20-1

j.

k.

1.

(1)

(2)

(3)

Clean inner and outer surfaces of casting with dry cleaning solvent (Item 13, App C). Dry casting

with compressed air.

Remove sludge and gum deposits with stiff brush.

Blow out all tapped holes with compressed air.

BALL BEARINGS. Bearings require special cleaning techniques. See TM 9-214 for cleaning and

maintenance procedures for ball bearings.

BATTERIES. See TM 9-6142-200-14 to service batteries.

OIL

(1)

(2)

PASSAGES.

Make sure oil passages are not clogged.

Clean oil passages with brass wire probes to break up any sludge or gum deposits.

WARNIN G

Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area

with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do

not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy

while using solvent, breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get

medical help immediately. Keep fire extinguisher nearby.

WARNIN G

 Air pressure in

pressurized air

.

excess of 30 psi (207 kpa) can injure personnel. Do not direct

at yourself or others. Always wear goggles.

1

(3) Flush oil

m. OIL SEALS,

passages with dry cleaning solvent (Item 13, App C). Dry parts with compressed air.

ELECTRICAL CABLES, AND FLEXIBLE HOSES.

CAUTIO N

Cleaning solvent causes leather, robber,

and synthetic materials to become brittle.

Do not use cleaning solvent to clean seals,

cables, and flexible hoses.

CAUTIO N

Clean seals, cables, and flexible hoses with

general purpose detergent (Item 17, App C)

and water. Dry parts with wiping rag

(Item 61, App C).

2-32
TM9-2350-261-20-1

n. INSERTS. Blow out insert holes with compressed air.

0. GASKETS.

WARNIN G

Air pressure in excess of 30 psi (207 kpa) can injure personnel. Do not direct

pressurized air at yourself or others. Always wear goggles.

WARNIN G

Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area

with good air flow, away from sparks, heat, or flames. Wear-goggles and gloves. Do

not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy

while using solvent, breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get

medical help immediately. Keep fire extinguisher nearby.

If a gasket is being removed, scrape old gasket material and sealant off mating surface. Clean

mating surface with dry cleaning solvent Item 13, App C). Dry with wiping rag Item 61, App C).

INSPECTIO N

Au

a.

b.

c.

d.

e.

f.

removed parts must be inspected with care. Replace parts if damage or wear exceeds allowable limits.

GENERAL. Procedures for inspection will be the same for most parts. General inspection procedures are

given in steps b through p below. Special inspection procedures are covered in the task as needed.

CASTINGS.

(1) Inspect all castings and forgings for breaks, cracks, and wear or scoring that would impair function.

(2) Inspect machined surfaces for nicks, burs, and raised metal. Mark damaged areas for repair.

(3) Use straightedge to check all mounting flanges on housings and supports for bends. Inspect mating

flanges for stains which would indicate oil leakage.

(4) Inspect all threaded parts for damaged or stripped threads.

NEEDLE ROLLER BEARINGS. Inspect bearings for free and smooth rotation and broken or missing

rollers. Also look for tightness of fit in bearing bores. Inspect bearing races for wear and color changes due

to heat. See TM 9-214 for inspection procedures.

STUDS. Inspect all studs for stripped or damaged threads, bent or loose condition, and signs of stretching.

GEARS. Inspect gears for burs, wear, cracked or broken teeth, and pitting at tooth contact areas.

BUSHINGS AND BUSHING-TYPE BEARINGS.

(1) Check all bushings and bushing-type bearings for secure fit in casting. Check for color changes which

could mean overheating. Inspect for size, scoring, out-of-roundness, burs, sharp edges, and signs of

seizing.

(2) Check for dirt in oil holes and in bushing-type beearings. Oil holes and grooves must be clean and not

damaged.

2-33
TM9-2350-261-20-1

g.

h.

i.

j.

k.

l.

m.

n.

o.

P.

OIL SEALS.

(1) Inspect feather edge of oil seals for tears, fraying, hardening, and cracking.

(2) Replace metal-covered oil seals when there are signs of damage or oil leakage.

CORE HOLE PLUGS. Inspect core hole plugs for signs of leakage. Replace damaged core hole plugs.

INSERTS.

(1) Inspect inserts for cracks and stripped or damaged threads.

(2) Check inserts for loose fit.

GREASE SEALS, PREFORMED PACKINGS, AND GASKETS.

(1)

(2)

(3)

Inspect seals that are composition-type, rings, and preformed packings for wear, brittleness, cracks,

cuts, and damage.

Inspect lip seals for cracks, wear, cuts, and brittleness. Inspect springs and seal shells for damage.

Gaskets and seals on electrical parts maybe reused. Inspect gaskets and seals for wear, nicks, cuts,

and torn or missing gasket material. Replace gasket if needed.

SPLINED PARTS. Inspect splined parts for burrs, wear, twisted, cracked, or broken splines.

THREADED PARTS. Inspect all threaded parts for burrs and stripped or damaged threads.

RETAINING RINGS. Inspect retaining rings for nicks, burrs, defects, loss of tension, and wear.

SPRINGS. Inspect springs for wear, defects, breaks, and loss of tension or compression. Inspect springs

using a spring tester.

SHAFTS AND SPINDLES. Inspect shafts and spindles for excessive wear, binding, scores, cracks, and

burrs.

ELECTRICAL PARTS.

 (1) 

 (2)

(3)

Inspect electrical parts before you install them. Look for mildewed, corroded, or burned parts.

Inspect electrical parts for pinched or loose wires and for cracked or broken wires, circuit cards, relays,

and connectors.

Inspect insulation and heat shrink tubing for cracks, tears,

REPAI R

a. GENERAL. General repair procedures are given in steps b through

the task. After repair, clean all parts well.

burns, or missing material.

1 below. Special repairs are covered in

2-34
TM9-2350-261-20-1

b. CASTINGS.

(1) Replace all cracked or broken castings.

WARNING

Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area

with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do

not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy

while using solvent, breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get

medical help immediately. Keep fire extinguisher nearby.

(2) Repair minor damage to machined surfaces of castings with crocus cloth. Replace any part with

defects that cannot be corrected or which will impair function.

(3) Repair minor surface bends by working bent surface of casting across sheet of crocus cloth on surface

plate. Replace bent castings which would impair assembly or function.

c. BALL BEARINGS. See TM 9-214 for inspection and maintenance for ball bearings.

d. NEEDLE ROLLER BEARINGS. See TM 9-214 for inspection and maintenance of needle roller bearings.

e. BUSHINGS AND BUSHING-TYPE BEARINGS. Replace. Replace bushings and bushing-type bearings if they are

loose, scored, or have color change due to heat. When you replace bushings and bushing-type bearings,

check nearby parts for damage or wear.

f. OIL SEALS. Oil seals must be replaced when thin feather edge is damaged or when seal material is brittle.

(1) Press damaged oil seal from casting. Be careful not to damage bore.

WARNIN G

Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area

 with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do

not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy

while using solvent, breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get

medical help immediately. Keep+ fire extinguisher nearby.

(2) When oil seal bore is damaged so an oil-tight seal is impossible, replace casting or adapter. Remove

alight nicks, burs, and scratches with crocus cloth dipped in dry cleaning solvent (Item 13, App c).

(3) Install new oil seal in casting bore or adapter using suitable oil seal replacement tool.

g. GREASE SEALS, PREFORMED PACKINGS, AND GASKETS.

(1) Replace seals which show signs of wear, brittleness, cracks, and damage.

(2) Replace defective lip seals, springs, and seal shells.

(3) Preformed packings and gaskets should be replaced when removed unless otherwise stated in the

maintenance task. They should not be reused.

2-35
TM 9-2350-261-20-1

h.

i.

j.

THREADED PARTS. Replace all parts that have stripped or damaged threads. Replace parts that cannot

be repaired by chasing threads with a used tap or die.

RETAINING RINGS.

(1) Replace retaining rings that have defects.

(2) Some retaining rings are beveled on one side. When installing this type of ring, the beveled side must

face the part to be retained.

SPRINGS. Discard springs that have defects. Load and height inspection data, where needed, are given in

maintenance procedures.

WARNIN G

 Air pressure in excess of 30 psi (207 kpa) can injure personnel. Do not direct

pressurized air at yourself or others. Always wear goggles.

.

k. SHAFTS AND SPINDLES.

(1) Replace shafts and spindles that show signs of wear, binding,

passages.

(2) Remove obstructions with compressed air or by probing with

(3) Remove burrs and minor surface defects with a crocus cloth.

Fluid Seepage is not great enough to form drops, but is shown by wetness or color changes.

Fluid leakage is great enough to form drops. Drops do not drip from the item being checked or

inspected.

Mud leakage is great enough to form drops that fall from the item being checked or inspected.

scores, cracks, burrs, or clogged oil

soft wire.

1. ELECTRICAL PARTS.

(1) Replace corroded or burned parts and parts which show signs of mildew.

(2) Tighten

(3) Replace

(4) Replace

loose connections.

cracked or broken wires, circuit cards, relays, and connectors.

cracked, torn, or burned insulation and heatshrink tubing.

FLUID LEAKS AND CHECKING FOR LEAKS

a. GENERAL. Fluid leaks in hoses and fluid lines affect the carrier parts operation. The types and classes of

leaks are given ‘below.

CLASS I

CLASS II

CLASS III

2-36

1
TM 9-2350-261-20-1

NOT E

You are allowed to operate equipment with

minor leaks (Class I or II). You must consider how much fluid the item or system being

checked or inspected can hold. When in

doubt, notify your supervisor. Any fuel or

Class 111 leaks will make the vehicle NOT

READY/ AVAILABLE.

b. CHECKING FOR LEAKS AFTER A MAINTENANCE TASK. After doing maintenance on a part which

involves hoses or fluid lines, check for leaks. If leaks occur after you have done a replace or repair task, find

the source of the leak, Correct the problem. Follow these procedures.

(1) Do visual inspections to find the source of the leak.

(a) Check for cracks on housing or cover.

(b) Check that screws and any connections are not loose or overtight.

(2) If you cannot see the source of the leak, repeat the maintenance task. Check the items listed below as

you repeat the task.

(a) Check that preformed gasket is not bent, or pinched.

(b) Check machined surfaces for fit and cleanliness.

(c) Install new” replacement parts.

(3) After you repeat the task and install a new part, the leak could persist. If so, report the problem to

your supervisor.

c. CHECKING FOR LEAKS USING CHALK TEST. Following replacement, repair, or adjustment of a

ramp, door, hatch cover, access panel, or rubber seal, check for leaks by performing a chalk test. Use the

following procedures.

(1) Use chalk or chalk powder to coat area around seal.

(2) Close ramp, door, hatch cover, or panel.

(3) Open ramp, door, hatch cover, or panel.

(4 Check for unbroken chalk line on mating surface. Where chalk does not stick to mating surface, there

is a leak in the seal surface.

(5) If a leak is found, perform adjustment to correct the problem.

2-37
TM9-2360-261-20-1

WARM-UP ENGINE

To warm up the engine for a maintenance or troubleshooting task, do the following:

1. Cover air inlet grill.

2. Start engine. See your -10.

3. Lock steering levers.

4. Move gear selector to 2-3 range. Do not release steering levers.

5. Raise engine speed to 1500 rpm until normal operating temperature is

reached.

6. Lower engine rpm to idle.

7. Move gear selector to NEUTRAL.

8. Stop engine. See your -10.

9. Uncover air inlet grill.

2-38 
TM9-2350-261-20-1

Section V. PREVENTIVE MAINTENANCE CHECKS AN D

SERVICES (PMCS)

SCOPE

This section details preventive maintenance checks and services (PMCS) required for the unit maintenance

level. For crew level PMCS, see your -10.

MAINTENANCE FORMS AND RECORDS

The forms and records you fill out have many uses. They are a permanent record of the services, repairs, and

changes made to your carrier. They also tell you whether faults have been repaired. For information on forms

and records, see DA Pamphlet 733-750.

PMCS PROCEDURES

a.

b.

c.

d.

e.

f.

Obey all WARNINGS and CAUTIONS when you do PMCS.

Name, caution, and instruction plates should be easy to read: If they are dirty or corroded, clean them, and

coat them with lacquer. See TM 43-0139 for instructions.

Perform all lubrication in accordance with LO9-2350-261-12, LO9-2350-259-12, and

LO 9-2350-300-13.

If something doesn’t work, troubleshoot it using the troubleshooting procedures beginning on page 3-1 of

this manual.

Do the semiannual PMCS every 1500 miles (2400 km) of operation or no later than 6 months after the last

semiannual PMCS.

Always do your PMCS in the same order so it gets to be a habit. With practice, you’ll spot anything that is

wrong.

Keep your earner clean. Dirt, grease, oil, and debris only get in the way, and may cover up a serious

problem. Clean your carrier as you work and as needed.

WARNING

Dry cleaning solvent P-D-680 is toxic and flammable. Always use in an open area

with good air flow, away from sparks, heat, or flames. Wear goggles and gloves. Do

not breathe vapors. Avoid contact with skin, eyes, and clothes. If you get dizzy

while using solvent, breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent gets in eyes, flush eyes with fresh water and get

medical help immediately. Keep fire extinguisher nearby.

h. Use dry cleaning solvent (Item 13, App C) on metal surfaces. Use general purpose detergent

(Item 17, App C) and water when you clean rubber or plastic parts.

i. You need to know how fluid leaks affect your carrier. Definitions of the types and classes of leaks are given

below. You need to know them to determine the condition of your earner. Learn them. REMEMBER:

WHEN IN DOUBT, NOTIFY YOUR SUPERVISOR!

2-39
CLASS I Seepage of fluidis not great enough to form drops, but is shown by wetness on the assembly or item.

CLASS II Leakage of fluid is great enough to form drops, but drops do not drip from item being

checked or inspected.

CLASS III Leakage of fluid is great enough to form drops that fall from the item being checked or

inspected.

NOTE

The carrier may continue to operate with minor water or

oil leaks (Class I or II). You must consider how much fluid

the item or system being checked or inspected can hold.

When in doubt, notify your supervisor. Any fuel or Class

III leaks will make the carrier NOT MISSION CAPABLE.

TM9-2350-20- 1
Item

No.

1

a

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

SemiAnnual

Item To

Be

Inspected

Road Test

Left and

Right

Steering

Procedure

NOTE

Be sure that all operator level

PMCS in your -10 have been completed prior to performing this

PMCS. Any non-mission capable

faults must be corrected prior to

road test. Check instruments,

gages and warning lights for

normal indications as outlined

in your -10. All operator recorded deficiencies should be reviewed prior to road test.

Perform a road test. Drive carrier at

least 5 miles (8 km).

NOTE

When conditions prevent a road

test, perform engine idle test

(page 2-43), governed no load

test, and stall check (page 2-44).

CAUTION

Do not allow engine to operate

for prolonged periods if : outside air temperature is less than

85° F (29° C) and coolant temperature gage is above 200° F

(93° C). Outside air temperature

is above 85° F (29° C) and coolant

temperature gage is above 230° F

(110° C). Serious damage to engine may result.

CAUTION

Power plant can be damaged. Do

not pivot steer when carrier is

moving except in a track failure

emergency.

Check steering levers for left and right

turns. If carrier does not turn left or

right when lever is applied,

troubleshoot lever adjustment.

Not Mission

Capable If

Any Class III leak

or damage that

would prevent operation of carrier.

Binding, grabbing,

unusual noise, vibration, or carrier

fails to turn.

Change 3 2-41
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Itern Interval Item To Procedure Not Mission

No. Be Capable If

Inspected

b Semi- Steering in Check steering in forward range and Binding, grabbing,

Annual Forward in reverse range. If earner does not unusual noise, viand Re- make a complete turn after steering bration or earner

verse levers are pulled to the left and right, fails to turn.

Range troubleshoot steering system (page

3-176).

c Semi- Carner Check earner braking. If carrier does Carrier fails to stop.

Annual Braking not stop when steering levers are fully

depressed, troubleshoot differential

brake adjustment (page 3-176).

d Semi- Carner Check shifting of carrier in all ranges. Carrier fails to shift

Annual Shifting in If carrier does not respond properly to into selected range.

All Ranges selected driving range, troubleshoot

gear selection system (page 3-1 77).

WARNING

Failure to lock the steering levers and block the

road wheels can allow the

carrier to move and could

result in injury or death.

Always lock the steering

levers and block road

wheels before working

on the carrier.

2 Semi- After Road Immediately after road test, cau- Any Class III leak or

Annual Test tiously feel all wheel and idler hubs for cold shocks.

noticeable difference in temperature

between hubs. An overheated hub indicates that bearing is out of adjustment, poorly lubricated, or damaged.

Check temperature of shock absorbers. They should be warm. A cold

shock is faulty.

Visually check inside, outside, and underneath of carrier for fuel, oil, or hydraulic leaks.

2-42 Change 3

TM9-2350-261-20-1
TM 9-2360-261-20-l

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

3 Semi- Idle Test CAUTION

Annual Avoid lengthy engine idling.

This causes coolant temperature

to drop below operating temperatures and can shorten engine life.

Run engine at 800 rpm for 3-5 minutes

with range selector in 2-3 range and

brakes locked until normal operating

temperature is reached.

Engine runs hot or

rough.

If outside air temperature is less than

85°F (29°C), normal operating temperature should be 160° to 200° F (71°

to 93°C). If outside air temperature is

greater than 85° (29°C, normal operating temperature should be 160° to

23O°F (71” to 110°C).

With range selector in N, engine

should idle smoothly at 650 to 700

rpm.

High or low engine idle speed is usually caused by accelerator linkage being out of adjustment. Adjust linkage

if necessary (page 23-34).

Rough idling is usually caused by

faulty injector timing and rack setting,

faulty injectors, or air in the injection

system. Contact next higher level

maintenance.

Change 3 2-43
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To

No. Be

Inspected

Procedure Not Mission

Capable If:

4 Semi- Governed Run engine at 800 rpm for 3-5 minutes

Annual No-Load with range selector in 2-3 range and

Test brakes locked until normal operating

temperature is reached.

If outside air temperature is less than

85° F (29°, normal operating temperature should be 160° to 200° F (71°

to 93°C If outside air temperature is

greater than 85° (29°C, normal operating temperature should he 160° to

230° F (71° to 110°C.

With engine quick-disconnect lever in

NEUTRAL, slowly open throttle control until accelerator is fully depressed.

When you suspect a faulty governor, do not exceed 3,000 rpm engine speed for more than 2 or 3

seconds.

Engine speed may exceed 3,000 rpm Governor cuts in

momentarily, but should stabilize at and out, or surges at

2,925 to 2,975 rpm. this speed, adjust5 Semi- Stal l

ments are needed.

The stall check will tell you if the

Annual Check power plant is producing maximum

Notify higher maintenance level.

power. If it is not, the check will tell

you whether the engine or transmission is at fault.

NOTE

If check fails and a faulty tachometer is suspected, verify tachometer reading by performing STEICE check number 10 (page 3-

284) before sending to next higher

leve1 of maintenance.

Run engine at 800 rpm for 3-5 minutes

with range selector in 2-3 range and

brakes locked until normal engine operating temperature is reached

If outside air temperature is less than

85° C (29° C), normal operating temperature should be 160° to 200° F (71°

to 93° C).

2-44 Change 4
TM 9-2350-261-20-l

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

L

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

5 Semi- Stal l If outside air temperature is greater

Annual Check than 85° F (29° C, normal operating

temperature should be 160° to 230° F

Continued (71° to 110° C.

CAUTION

Limit stall test to 30 seconds.

Lengthy full throttle operation

with brakes locked creates high

oil temperatures and will damage engine and transmission. If

you suspect a faulty governor, do

not perform stall check.

With brakes locked, move range selector to the 2-3 range and push accelerator all the way down. Tachometer

reading of 1900 to 2100 rpm indicates

power plant is operating correctly.

NOTE

Tachometer above

2100 rpm or below

1900 rpm.

Extremely high ambient temperature and high altitude will

lower stall speed.

NOTE

Use STE-ICE to verify the

Tachometer is calibrated or

to get a reading whe n

performing a stall check. See

page 3-284 for STE-ICE Test 10

Engine RPM.

NOTE

If check fails and a faulty tachometer is suspected, verify tachometer reading by performing STEICE check number 10 (page 3-

284) before sending to next higher

level of maintenance.

Tachometer reading above 2100 rpm

indicates transmission problems.

Tachometer reading below 1900 rpm

indicates a faulty engine .

Troubleshoot fuel system (page 3-30).

Check for correct vehicle tachometer

adapter. If no fault can be found, contact next higher level of maintenance.

Change 4 2-45
TM 9-2250-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To

No. Be

Inspected

Procedure Not Mission

Capable If:

WARNING

Hot parts can burn you. Use care

when working near hot components.

With engine at idle, sample engine oil

and transmission oil.

6 Semi- Engine HARDTIME

Annual an d Hardtime interval may be shortened if Hardtime interval

Tran s equipment operates under adverse exceeded.

mission conditions (for artic operations, refer

to FM 9-207; for desert operations, reContinued fer to FM 90-3).

NOTE

If AOAP laboratory is not available, drain engine oil an d

change filter element/gaskets

every 1500 miles or annually.

Transmission oil should be

drained and filter element/gaskets changed every 150

hours/1500 miles or semi-annually.

CAUTION

Engine and transmission can be

damaged if filled above the full

(F) mark on the gage rods.

QN CONDITION

To drain engine or transmission oil, remove bottom access cover and drain

plug. Inspect oil for metal particles.

Replace engine or transmission oil filters each time an oil change is required. If metal chips are found, notify

Direct Support maintenance. See TM

9-2350-261-20, pages 4-3 or 18-8 for

removal of oil filters.

NOTE

Remove the driver’s side access

panel to replace engine oil filter.

Transmission oil filter is replaced through the bottom access cover.

2-46 Change 4
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If

Inspected

6 Semi- Engine NOTE

Annual and Drain oil only when hot after opTrans- eration. Allow oil to drain for

mission one hour if time permits. Do not

mix OE/HDO-15 W 40 with single

Continued grade lubricants.

NOTE

Visual inspection of engine/

transmission should not be justification to change oil. Detergent

oils may appear dark in color

due to additives. Change oil and

filters when converting from

OE/HDO to OEA, PE30-1 and

from OE/HDO, PE10-1 to OE/

HDO. See engine and transmission temperature key charts on

Lubrication Table.

Clean inside of engine filter cover or

transmission filter cavity with dry

cleaning solvent (PD-680, Type II,

Item 13, Appendix C).

Install new engine filter element/gasket, or transmission element/packings

(see TM 9-2350-261-20, page 4-7 or

18-9).

Refill engine and check oil level with

approximately 18 quarts of OE/HDO

or OEA. Bring level between full and

low marks on gage rod. Start and run

engine and check for oil leaks.

Refill transmission with approxi- Any Class III leaks.

mately 16 quarts of OE/HDO or OEA

after oil change. Start and run engine

and operate transmission through all

gear selector positions.

Engine and transmission operational Any Class III leaks.

check: run engine and check for oil

leaks at filter and drain plug IAW TM

9-2350-261-10. Inspect access covers

on hull bottom and replace gasket or

cover if required.

Change 3 2-47
TM 9-2350-261-20-1

Item

No.

7

8

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

SemiAnnual

Item To

Be

Inspected

Track

Pin/Nuts

Track

Grouser

Procedure

Check track pin nuts for looseness or

cracks. Replace cracked nuts. Check

track pins for stripped threads. Replace stripped track pins. Tighten

loose nuts to 115-135 Ib-ft (156-183

N.m)torque. Use torque wrench(Item

96, Appendix D).

Check grouser for wear or cracks on

both tracks. Replace track shoe if

grouser measures less than 1/8”

(3mm) in height or is cracked.

Not Mission

Capable If

Any pin/nuts that

are cracked,broken,

bent, stripped,

missing or protruding.

Grouser is worn below 1/8''or cracked.

2-48 Change3
TM 9-2350-261-20-1

9

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Track

Shoe

Pads and

Mounting

Studs/

Nuts

Procedure Not Mission

Capable If:

Check track shoe pads and mounting

nuts for looseness and stripped

threads on both tracks. If mounting

nuts are stripped, replace track shoe

pad (page 22-6). Tighten loose nuts to

135-155 lb-ft (183-210 N.m) torque.

Use torque wrench (Item 96, Appendix

D).

Studs/nuts ar e

cracked, stripped,

missing, or pad

height is less than

1/16” above grouser.

Change 3 2-49
TM 9-2350-261-20-1

Table 2-1 Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be

Inspected

Capable If:

10 Semi- Track Replace adjuster if either end is Hardware is broAnnual Tension cracked or broken (page 22-24). Replace broken adjuster mount (page

ken, cracked,

Adjuster missing or stripMounting 22-24). ped. Any class II

Hard- or III leaks.

ware

NOTE

See page 2-29 for proper use of

torque wrench adapters.

Replace missing track tension adjuster mount screws (page 22-24).

Tighten loose screws to 130-140 lb-ft

(176-190 N.m) torque. Use adapter

(Item 6, Appendix D) and torque

wrench (Item 96, Appendix D).

11 Semi- Track Replace leaking track adjuster (page Any leaks or fitting

Annual Tension 22-24). will not accep t

Adjuster grease.

Collar

Leaks

2-50 Change 4
Table 2-1. Unit Level Preventive Maintenance Checks and Services for MI13A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

12 Semi- Sprocket Tighten loose screws to 110-115 lb-ft Any screws are

Annual Mounting (149-156 N.m) torque. Use torque missing, loose or

Screws wrench (Item 96, Appendix D). worn.

Replace cushions if gouges, chips, or

cuts cause thumping (page 22-30).

Replace or reverse any worn sprocket

(page 22-30) that won’t pass your -10

PMCS inspection.

13 Semi- Sprocket Tighten loose sprocket hub screws to Any screws are

Annual Hub 170-190 lb-ft (231-258 N.m) torque. missing, loose or

Screws Use torque wrench (Item 98, Appendix worn.

D). If screws are missing, replace

(page 22-30).

Change 3 2-51

—

TM 9-2350-261-20-1 
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

2-52 Change 3

TM 9-2350-261-20-1 

Tighten loose final drive-to-hull

screws to 75-85 lb-ft (101-115 N.m)

torque. Use torque wrench (Item 97,

Appendix D).
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

15 Semi- Idler and Replace cracked or bent idler or road Any bent, broken or

Annual Road wheel arms (page 22-12, 22-20 or cracked arm or leakWheel 22-22). Replace idler or road wheel ing seal.

Arms arm relief valves and grease fittings if

leaking (pages 22-12,22-20, or 22-22).

Replace leaking road wheel arm seals

and gaskets (page 22-12).

16 Semi- Idler and Check idler and road wheel mounting Any missing or

Annual Road nuts for looseness. Tighten loose nuts stripped nuts.

Wheel to 150-170 lb-ft (203-230 N.m) torque.

Mounting Use torque wrench (Item 98, Appendix

Nuts D).

17 Semi- Idler/ Replace cracked, broken or bent idler/ Any broken, bent or

Annual Road road wheels and idler/road wheel hubs cracked idler/road

Wheels (page 22-7, 22-9, 22-16, or 22-17). Re- wheels or leaking

and Idler/ fer to page 2-54 for road wheel compo- hub seals.

Road nents.

Wheel

Hubs At each service, or whenever track is Number 1 and/or

removed, adjust wheel bearings if number 5 road

looseness or end play is shown (page wheel bearings

22-9 or 22-17). loose.

Replace leaking seals and gaskets

(page 22-9 or 22-17).

Change 3 2-53

TM 9-2350-261-20-1 
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

17 Semi- Idler/ Replace grease fittings and relief Any leaking grease

Annual Road valves if they are leaking (page 22-9 or fittings are found.

Wheels 22-17).

and Idler/

Road

Wheel

Hubs

Continued

18 Semi- Idler and Replace bent, broken or stripped idler/ Any broken, bent or

Annual Road road wheel hub ribbed bolts (page 22-9 stripped bolts.

Wheel or 22-16). Refer to page 2-53 for idler

Hub components.

Ribbed

Bolts

2-54 Change 3
Item

No.

19

20

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

SemiAnnual

Item To

Be

Inspected

Road

Wheel

Mounting

Hardware

Road

Wheel

Mounting

Holes

Procedure

Tighten loose road wheel arm mounting hardware to 130-140lb-ft (176-190

N.m) torque. Use torque wrench (Item

96, Appendix D).

If road wheel mounting holes extend

beyond head of mounting nut, replace

road wheel (page 22-9).

Not Mission

Capable It:

Any loose mounting

hardware.

Any elongated holes

that extend beyond

mounting nuts.

Change 3 2-55
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

21 Semi- Torsion Remove floor plates (page 24-36). Any broken, bent,

Annual Bar An- Check torsion bar anchors, splines, missing, stripped

chors/ and end plugs in arm and box beam for torsion bars or atSplines/ looseness on both sides of earner. If taching hardware.

End loose, tighten screw.

Plugs Check plugs. Be sure they are fully

seated. Tighten plug to 50-75 lb-ft

(68-102 N.m) torque. Use torque

wrench (Item 97, Appendix D).

Replace missing or damaged cotter

pins and pins or bolts from torsion bar

anchors (page 22-36).

2-56 Change 3

TM 9-2350-261-20-1
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

22 Semi- Shock Ab- Check shock absorber for dents or Any cracked, broAnnual sorber cracks. Replace shock absorber that is ken, bent or missing

bent, broken, cracked or dented shocks, dents that

enough to hinder operation (page hinder shock opera22-26) . tion, or Class III

fluid leaks.

Replace shock absorbers if they have

Class III fluid leaks or loose fitting

bearings (page 22-26).

23 Semi- Shock Ab- Check shock absorber mounting hardAnnual sorber ware for looseness. Tighten loose

Mounting hardware to 130-140 lb-ft (176-190

Hard- N.m)torque. Use torque wrench (Item

ware 96, Appendix D).

24 Semi- Shock Ab- Check shock absorber bracket mountAnnual sorber ing hardware for looseness. Tighten

Bracket loose hardware to 130-140 lb-ft

Mounting (176-190 N.m) torque. Use torque

Hard- wrench (Item 96, Appendix D).

ware

I

Change 3 2-57
TM 9-2850-261-20-1 

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Itern Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

25 Semi- Suspen- Replace leaking suspension lockout

Annual sion Lock- cylinders (page 28-74)

out Cylinders

(M741A1

only)

26 Semi- Track Replace torn shrouds. Tighten or reAnnual Shroud place loose or missing hardware. Repair bent shroud clamps.

27 Semi- Flotation Repair or replace flotation pods that

Annual Pods have bulging foam (page 24-215).

(M741A1

only) Tighten all flotation pod mounting

screws.

2-58 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To

No. Be

Inspected

Procedure Not Mission

Capable If:

28 Semi- Mortar Replace missing pin on base locking

Annual Base and clamp (page 24-255).

Bridge

Stowage Replace clamp that binds (page

Brackets 24-255).

(M106A2

only)

Replace cracked, cut or hard bridge

bumpers (page 24-256).

Repair or replace bridge lock that

binds or has damaged locking pin

(page 24-256).

28.1 Semi- Master

Annual Base and

Bridge

Stowage

Brackets

(M106 4

Only )

Ensure that bracket (1) closes and

locks properly. Check bracket (1, 2)

for cracks. Tighten or replace base or

missing bolts on brackets (1, 2).

Change 4 2-59
TM 9-2350-261-20-l

2-60 Change 4

Item

No.

29

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Procedure Not Mission

Capable If:

Generator Set

Enclosure

(M577A2

only)

Tighten or replace loose or missing

screws on enclosure to 55-60 lb-ft

(75-81 N.m) torque. Use torque

wrench (Item 97, Appendix D).

Replace damaged enclosure (page

24-118).
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Ite m

3 0

Interval

SemiAnnual

Item To

Be

Inspected

Fuel

Filler

Screen

and Cap

Procedure

WARNING

Dry cleaning solvent P-D-680 is

toxic and flammable. Always

open in area with good air flow,

away from sparks, heat o r

flames. Wear goggles and gloves.

Do not breathe vapors. Avoid

contact with skin, eyes and

clothes. If you get dizzy while using solvent, breathe fresh air

and get medical help. If solvent

gets on hands, wash them. If solvent gets in eyes, flush eyes with

fresh water and get medical help

immediately. Keep fire extinguisher nearby.

Check filler cap vent. If dirty, clean

with dry cleaning solvent (Item 13, Appendix C.

Attach or replace loose, broken or

missing keeper chain on filler cap.

Not Mission

Capable If:

2-60.1 (240.2 blank)

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

31 Semi- Fuel WARNING

Annual Tank

(M1 059 Fuel can catch fire and burn you.

only) Do not smoke. Disconnect battery ground lead (page 13-2) before you work on fuel system.

Wipe up spilled fuel.

Repair or replace any leaking tanks

(page 40-23).

Any contaminated

fuel tank or fuel

leak.

32 Semi- Tow Check pintle for proper operation (see

Annual Hooks your -10).

and

Pintle Lubricate pintle every 1500 miles or

semi-annually with GAA. Late model

pintles do not require lubrication.

Check tow hook mount screws for

looseness. Tighten loose screws to

130-140 Ib-ft (176-190 N.m) torque.

Use torque wrench (Item 96, Appendix

D).

Replace missing retaining pin or key

(page 27-3).

Change 3 2-61
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

33 Semi- Trailer Check cover for tight seal on wiring

Annual Wiring harness receptacle. Replace leaky

Harness cover (page 17-2).

Receptacle Cover

34 Semi- Rubber Replace cracked, cut or hard guards

Annual Guards (page 12-57).

35 Semi- Webbing Replace cracked, cut or frayed webAnnual Straps bing straps and loops (see your -10).

and Loops

36 Semi- Tail Replace discolored and cracked tail

Annual Lights, light lens (page 12-13).

stop

Lights Have assistant operate service tail

light, service stop light, blackout tail and light, and blackout stop light (see your

Blackout -10). Repair or replace lights that do

Lights not work. See Chapter 12 for specific

task.

STRAPS

2-62 Change 3

TM 9-2350-261-20-1 
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 F’OV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

37 Semi- Ramp Perform chalk test (page 2-37). ReAnnual Door, place leaky ramp door seal (page

Seal, and 25-32).

Catch

Check door for smooth operation. If Door fails to lock in

hinges bind, notify higher level of any position.

maintenance. Repair catch if door

does not lock in open position (page

25-33).

Adjust handle if door does not seal

tightly in closed position (page 25-34).

Change 3 2-63

TM 9-2350-261-20-1
TM 9-2350-261-20-1

Item

No.

38

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Ramp

Latches,

Seals,

and Wire

Rope

Procedure

WARNING

Lowering ramp could injure personnel. ‘Make-sure no one is in

ramp zone before you lower

ramp. Unlocked ramp can fall

open suddenly. Personnel can

be killed or injured. Ramp system and hull can get damaged if

ramp unlocks when carrier is in

operation. Do not operate carrier if locks do not secure ramp

properly.

 Keep away from ramps that have

come open during carrier operation.

With ramp closed, check for tight fit on

rear seal. Adjust ramp lock and linkage, if needed (page 25-2 or 25-1 O).

Replace ramp seal that is cut, cracked

or hard (page 25-36).

I

Replace wire rope that is frayed or has

broken strands (page 25-30 or 25-31).

Not Mission

Capable If:

Ramp fails up/down

operation using controls.

Damage allows

ramp to free fall or

wire rope is frayed

or broken.

2-64 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

tern Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

39 Semi- Tent and Replace tent that has tears, breaks,

Annua1 Stowage fraying or other damage (page 24-183).

Brackets

(M577A2 Tighten screws on mounting clamps

only) and strip.

40 Semi- Dome Check that dome lights and blackout

Annual Lights lights work right (see your -10).

and Troubleshoot faulty lights (page

Switches 3-117).

(M577A2

only)

Change 3 2-65
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

40 Semi- Dome Check that dome light switches and

Annual Lights blackout bypass switch work right (see

and your -10). Troubleshoot faulty

Switches switches (page 3-117).

(M577A2

Check that ramp door switch operates only) properly (see your -10). Troubleshoot

Continued faulty switch (page 3-182).

Check that admittance buzzer operate s properly (see your -10).

Troubleshoot faulty buzzer (page

3-122). Replace unrepairable buzzer

(page 12-72).

Check that blower operates properly

(see your -10). Troubleshoot faulty

blower (page 3-125).

Tape frayed electrical leads.

Replace damaged connectors (page

14-3).

2-66 Change 3
Item

No.

41

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Map Tables and

Map

Board

(M577A2

only)

Procedure

Tighten or replace loose or missing

screws on map tables and supports.

Replace map table or map board that is

badly damaged or warped (page

24-173 or 24-178).

Replace map table or map board with

badly damaged work surface (page

24-173,24-175 or 24-178).

Not Mission

Capable If:

Change 3 2-67
Item

No.

41

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Map Tables and

Map

Board

(M577A2

only)

Procedure

Tighten or replace loose or missing

screws on map tables and supports.

Replace map table or map board that is

badly damaged or warped (page

24-173 or 24-178).

Replace map table or map board with

badly damaged work surface (page

24-173,24-175 or 24-178).

Not Mission

Capable If:

Change 3 2-68
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

42 Semi- Head- Replace cracked or discolored lens in

Annual lights, service headlights, infrared headBlackout lights, blackout marker lights or

Lights, blackout headlight. See Chapter 12

and Horn for specific task.

WARNING

Looking directly at infrared

headlights may burn your eyes.

Do not look directly into infrared headlights.

Have assistant operate service headlights, infrared headlights and feel for

heat, blackout marker lights, blackout

headlight and horn. Repair or replace

lights or horn that do not work. See

Chapter 12, Section I for specific task.

2-68 Change 3
TM 9-2350-261-20-1

Item

No.

43

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Remove

Smoke

Grenade

Discharger (if installed)

Procedure

Remove base from front hull plate

(page 40-2).

Check wiring harness. Replace

cracked or broken leads and connectors (page 14-3).

Check guard, plate and base. Replace

damaged parts. Tighten loose screws

and nuts.

Install base on front hull plate (page

40-2).

Repeat steps above for opposite side of

earner.

Not Mission

Capable If:

Change 3 2-69
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

44 Semi- Trim Replace gouged or hard trim vane

Annual Vane bumpers (page 24-11 or 24-13).

Replace or repair warped or badly

damaged trim vane (page 24-11 or

24-13) .

Check release mechanism and control

linkage for proper operation. Replace

weak springs and broken parts (page

24-11 or 14-13).

45 Semi- Power WARNING

Annual Plant Power plant door may spring

Grill and open. Soldiers can be injured.

Power When opening, stay out of door

Plant path.

Front Ac- Check screws on power plant grill for Damage prevents cess Door looseness. Tighten loose screws to door from closing,

100-120 lb-ft (136-163 N.m) torque. sealing or locking.

Use torque wrench (Item 96, Appendix

D).

Check power plant front access door

seal for cracks, cuts, stiffness and

looseness. If seal is loose, tighten. If

damaged, replace (page 24-24).

Check for tight seal on door in closed

position. Perform chalk test (page

2-37).

ACCESS DOOR SEAL

I

2-70 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

tern Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

46 Semi- Radiator Replace filler cap that does not seal Any Class III coolAnnual Auxiliary tightly on auxiliary tank filler neck ant leaks.

Tank (page 8-28).

Filler Cap

Attach or replace loose, broken or

missing keeper chain on filler cap

(page 8-28).

47 Semi- Lifting Check for loose or missing screws on

Annual Eyes lifting eyes. Replace missing screws.

Tighten loose screws to 175-200 lb-ft

(237-271 N.m) torque. Use torque

wrench (Item 98, Appendix D).

Change 3 2-71

*
TM 9-2350-261-20-1 

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

48 Semi- Hatch Replace cracked, cut or hard seal (see Hatch fails to lock in

Annual Covers, Chapter 24, Section V). any position, or

Latches catch safety pin is

and Seals missing.

Check covers for smooth operation.

Repair or lubricate cover that binds.

Repair catch if cover does not lock in

open position.

Replace damaged or missing catch

safety pins,

Replace bumpers that are cut, gouged

or hard.

Adjust bumpers that do not compress

when covers are locked open (see your

-10).

2-72 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

49 Semi- Machine Check for loose or missing screws on Mount is cracked or

Annual Gun machine gun mount. Replace missing broken.

Mount screws. Tighten loose screws (page

24-90).

MACHINE GUN MOUNT

50 Semi- Power Check final drive drain plugs for leaks. Any Class III leaks,

Annual Plant Tighten leaking plugs (page 24-34). missing seals, covBottom ers or plugs.

Access

Cover, Check for loose or missing hull drain

Hull

plugs. If missing, replace. Tighten

loose plugs (page 24-34). Drain

Plugs, Remove power plant bottom access Missing or loose

and Final cover and check for missing or dam- seals, plugs or covDrive aged seal. Replace missing or dar- ners.

Drain aged seal. Install bottom access cover.

Plugs Torque screws 40-50 lb-ft (54-68 N.m)

torque. Use torque wrench (Item 97,

Appendix D).

Change 3 2-73
TM 9-2350-261-20-1 

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item

No.

50

51

Interval

SemiAnnual

Item To

Be

Inspected

Power

Plant

Bottom

Access

Cover,

Hull

Drain

Plugs,

and Final

Drive

Drain

Plugs

Continued

Procedure

Check for loose or missing screws in

power plant bottom access cover. Replace screws if missing. Tighten loose

screws to 40-50 lb-ft (54-68 N.m)

torque. Use torque wrench (Item 97,

Appendix D).

Not Mission

Capable If:

SemiAnnual

Final

Drive

Inspect final drive input shaft oil seals

for evidence of leakage. Replace final

drive seals (page 20-11) using torque

wrench (Item 97, Appendix D).

Tighten screws to 252-300 lb-in (28-34

N•m) torque.

Any Class III leak.

2-74 Change 3
TM 9-2350-261-20-l

53

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval

N o .

SemiAnnual

SemiAnnual

Item To

Be

Inspected

Power

Plant

Noises

Exhaust

System

Procedure

Check power plant operation. When

unusual noises are heard, repair suspect component or contact higher level

of maintenance for assistance and repair.

NOTE

Carrier leaks exhaust gas when

cold. For this reason, carbon

will be present around joints

and exhaust pipe connecting

clamps. This is normal. The exhaust system joints will seal after pipes heat up. Check for exhaust leaks only after engine

reaches normal operating temperature of 180° to 205° F (71° to

93.3° C). Your carrier may be

equipped with new exhaust

pipes which do not require a

muffler clamp.

Check for loose, missing, or damaged

manifold pipes, muffler and exhaust

clamps. After leak check, replace any

pipes, clamps or muffler (page 7-21 or

7-22) that fail to stop exhaust leaks.

Not Mission

Capable If:

Missing or damaged

hardware tha t

would allow leakage.

Change 3 2-75
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

54 Semi- Ai r WARNING

Annual Cleaner Air pressure in excess of 30 psi

(207 kpa) can injure personnel

Do not direct pressurized air at

yourself or others. Always wear

goggles.

NOTE

You will have one of two air

cleaner configurations. Body

and elements are not interchangeable!, except as sets.

Latches or element

is missing, damaged

or broken. Gasket is

tom or separated

from element.

Clean or replace air cleaner element

(see your -10).

55 Semi- Air

Annual Cleaner

Hoses

Clean drain hole on bottom of air

56 Semi- Electrical cleaner container. Replace damaged

Annual Connec- container (page 7-7).

tors an d

Leads Replace cracked, broken or brittle

hoses. See Chapter 7 for specific hose.

Check electrical connectors for looseness or broken contact. Replace broken connectors (page 14-1).

Check that electrical leads in power

plant compartment are not frayed, cut

or broken. If leads are damaged, identify damaged lead Go to the Alphabetical Index and locate specific task to

repair or replace damaged lead or wiring harness.

2-76 Change 4
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Change 3 2-77

NOT E

See page 2-29 for proper use of

torque wrench adapters.

Use adapter (Item 8, Appendix D for

6C joints or Item 7, Appendix D for 7C

joints) to tighten screws.

If you have 6C joints, tighten screws

(3/8 -24 x 1-3/4) to 35-40 lb-ft (47-54

N.m) torque. If you have 7C joints,

tighten screws (1/2-20x2) to 83-100 lbft (113-136 N.m) torque. See page 2-29

for torque wrench reading with adapte r .

Lubricate U-joints every 150 hours,

1500 miles or semi-annually with

GAA. Clean fittings with PD 680 Type

of solvent
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable It:

Inspected

58 Semi- Differen- Replace missing or damaged retaining Any cracked or broAnnual tial clips and mount pins on differential ken mounts.

mounts (page 21-20). Drain differential every 100 hours, 1500 miles or

semi-annually. Remove front hull

plug and differential drain plug. Inspect drain plugs for metallic particles

and refill oil system with OE/HDO as

needed. Clean and inspect breather

and oil filter with PD 680 Type III solvent. If metal chips are found notify

Direct Support Maintenance.

WARNING

FireResistantHydraulic (FRH)

fluid may contain tricresyl phosphate which, if taken internally,

can produce paralysis. Hydraulic fluid may be absorbed

through the skin. Wear long

sleeves, gloves, goggles, and face

shield. If FRH gets in eyes, wash

them immediately and get medical aid immediately. If FRH gets

on your skin, thoroughly wash

with soap and water. Wash

hands thoroughly prior to eating

or smoking. Application of these

measures is considered an effective control of the hazard.

CAUTION

Use only FRH or OHA hydraulic

fluid. Do not mix different types

of hydraulic fluids. Do not overfill.

59 Semi- Differen- NOTE

Annual tial Brake If hydraulic fluid is contamiAdjust- nated, or fluid type is changed,

ment drain pivot steer system using

procedure in LO 9-2350-281-12,

card 19, paragraph 4.

2-78 Change 3
TM 9-2350-261-20-1

59

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

SemiAnnual

Differential Brake

Adjustment

Continued

Using weighing scale (Item 61, Appendix D), perform pull test to inspect for

proper operation of steering levers and

differential brakes. With the levers

locked at the second quadrant position, 10 to 30 pounds (4.5-14 kg) of pull

should unlock the levers. Adjust differential brakes if needed (page

21-18). Remove fill plugs and check

pivot steer master cylinders every 150

hours, 1500 miles or semi-annually.

Add FRH as required to bring fluid

within 1/2 to 3/4” from top of cylinder.

Change 3 2-79
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

60 Semi- Power Open power plant front access door

Annual Plant (see your -10) and remove hull access

Compart- cover (page 24-24).

ment

WARNING

Dry cleaning solvent PD 680 is

toxic and flammable. Always use

in an open area with good air

flow, away from sparks, heat or

flames. Wear goggles and gloves.

Do not breathe vapors. If you get

dizzy while using solvent,

breathe fresh air and get medical help. If solvent gets on

hands, wash them. If solvent

gets in eyes, flush eyes with

fresh water and get medical help

immediately. Keep fire extinguisher nearby.

Clean power plant compartment with

dry cleaning solvent (Item 13, Appendix C). Remove debris and wipe up

spilled oil and fuel.

STARTER

COMPONENTS

2-80 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

61 Semi- Electrical Check all generator mounting bolts for

Annual System tightness. Tighten or replace parts.

Check generator drive belt for crack- Belt is broken,

ing, fraying and breaks. Check for cracked to belt fitightness. Play should be about 1/2”. ber, has more than

one crack (1/8” in

depth or 50% of the

belt thickness), has

frays more than 2"

long or excessive

play.

Check generator pulley for tightness Pulley moves on

on alternator shaft. Grasp pulley with shaft.

both hands and try to move it fore and

aft on shaft. If pulley moves on shaft,

tighten shaft nut.

Check starter hardware and wiring for

tightness. Tighten or replace parts as

required.

Change 3 2-81

--l--r—— .-”-.——. - .-—.
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

2-82 Change 3

Check regulator operating voltage.

Adjust voltage if necessary. voltage

adjustment (page 9-38)
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

62 Semi- Power Forward engine mount. Tighten loose Any cracked or broAnnual Plant mount screws to 360-420 lb-in (41-48 ken mounts.

Mount N.m) torque. Use torque wrench (Item

95, Appendix D) and socket set (Item

89, Appendix D).

Tighten loose mount screws to 90-100

lb-ft (122-135 N.m) torque. Use torque

wrench (Item 97, Appendix D).

63 Semi- Drive Check fan belts for proper tension (see Any belt that is

Annual Belts your -10). Adjust, if needed (page missing, broken,

8-35). frayed more than 2",

cracks 1/8” in depth

of 50% of belt thickness.

Check generator drive belts for proper

tension (see your -10). Adjust, if

needed (page 9-29 or 9-47).

Replace frayed or cracked belts (page

8-35,9-29 or 9-47).

64 Semi- Cooling Replace cracked or bent drive pulley Any cracked, broAnnual Fan and idler pulley (page 8-41 or 8-37). ken, loose or missReplace loose/worn bearings (page ing hardware.

8-46).

Change 3 2-83

CAAAU a u-. -w . v ....-. v-p \-! . ------ . - ---J
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

65 Semi- Transfer Replace missing or damaged retaining Any missing, broAnnual Gearcase clip and mount pin on transfer gear- ken, cracked hardcase (page 19-2). ware or Class III

leaks.

Use adapter (Item 5, Appendix D) and

tighten mounting nut to 75-80 lb-ft

(102-108 N.m) torque. Use torque

wrench (Item 97, Appendix D).

Loosen and re-torque 10 transfer gearcase to transmission bolts to 252-300

lb-in (28-34 N.m) torque. Use torque

wrench (Item 95, Appendix D) and

socket set (Item 89, Appendix D).

–Drain transfer gearcase every 150

hours, 1500 miles or semi-annually.

Remove the hull drain plug and

gearcase drain plug.

–Inspect oil for metallic particles. If

metal chips are found, notify Direct

Support Maintenance.

2-84 Change 3

TM 9-2350-261-20-1
Item

No.

66

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Cooling

System

Procedure

WARNING

Compressed air can injure you

and others. Do not aim air at soldiers. Do not use more than 30

psi. Always wear goggles.

Clean outside of radiator including

fins. Use air gun.

Check radiator for damage, cracks and

leaks.

Check hoses for kinks, cracks and

breaks.

Check engine coolant pump belt for

cracking, fraying and breaks. Check

for tightness. Play should be about

1/2”.

Check for bent or damaged pulley.

1

Not Mission

Capable If:

Any Class III leaks.

Missing hardware

or Class III leaks.

Belt is broken,

cracks to belt fiber,

has more than one

crack (1/8” in depth

or 50% of belt thickness), has frays

more than 2" long or

excessive play.

Pulley damaged or

I

unserviceable.

Change 3 2-85
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

66 Semi- Cooling WARNING

annual System

Hot coolant can burn you. Do

Continued not open radiator cap access

cover or remove cap until coolant gage reads in the bottom

one-quarter of green zone.

Table 1.

Lowest Estimated Pints of Ethylane Glycol

Antifreeze to be Included

in Preparation of l-Gal.

+20 °F (-7C) . . . . . . . . . . . . . . . ...1-1/2

+10 °F (-12 C) . . . . . . . . . . . . . . . . ..2

0

o

F (-18C) . . . . . . . . . . . . . . . . ...2-3/4

-10° F (-23C) . . . . . . . . . . . . . . . . ..3-1/4

-20° F (-29C) . . . . . . . . . . . . . . . ...3-1/2

-30° F (-34C) . . . . . . . . . . . . . . . ...4

-40° F (-40C) . . . . . . . . . . . . . . . ...4-1/4

-50° F (-46C) . . . . . . . . . . . . . . . ...4-1/2

-55° F (-48C) . . . . . . . . . . . . . . . ...4-3/4

NOTE

A freeze protection indication

beyond the limits shown in Table

1 or below -550 F (-48° C), when

MIL-A-46153 antifreeze is used,

will require partial coolant

drain and replacement with

water. Freeze protection must

not exceed -55° F (-48° C) when

MIL-A-46153 is used.

2-86 Change 3

TM 9-2350-261-20-1
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

66 Semi- Cooling Test for antifreeze protection by use of Antifreeze protecAnnual System a combination antifreeze and battery tion does not comply

tester. with Table 1.

Continued

Test for reserve alkalinity (corrosion Test kit indicates

protection) by means of the Test Kit, the coolant is unReserv e Alkalinity (NSN safe.

6630-10-011-5039). Color indication of

the test kit stick will determine condition of the coolant and its potential corrosion protection. Instructions for use

are as follows:

Dip stick into coolant, and remove

immediately. Do not use test

stick if coolant temperature is below 50° F (10° C) or if using a commercial brand antifreeze.

Fifteen seconds after dipping, compare color on the stick with the color

chart on the container, and annotate.

(a) Blue indicates coolant is safe

to use.

(b) Green indicates reserve alkalinity and corrosion protection of

coolant is marginal but may be

used safely until the next service

inspection.

NOTE

Do not use antifreeze extender

additive (MIL-A-53009) when artic antifreeze is used in the cooling system.

Yellowish green indicates the coolant

is unsafe to use. If the DD Form 314

identifies the coolant as the original

charge, then add three percent by volume (1 pint per 17 quarts) of the antifreez e extender additive

(MIL-A-53009) to the cooling system.

Change 3 2-87

TM 9-2350-261-20-1 
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No, Be Capable If:

Inspected

66 Semi- Cooling Addition of extender to antifreeze is a

Annual System one time service. When the extender is

added to the antifreeze, the date must

Continued be recorded in the “remarks” block of

DED Form 314. If the DD Form 314

identifies the unsafe coolant as having

been extended before, or the coolant as

artic antifreeze, then the coolant must

be drained and replaced with fresh

coolant. See Flush Cooling System,

Chapter 8 (pages 8-3 through 8-6).

Check coolant cleanliness by draining Excessive coolant

a small amount of coolant into a clean contamination is

container, and look for excessive rust, found.

foreign particles and/or sediment.

2-88 Change 3

TM 9-2350-261-20-1
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

67 Semi- Fan Gear- Check fan gearbox oil level and add oil, No oil in sight glass.

Annual box if needed. Any Class II or

–Drain gearbox every 1500 miles greater oil leak.

or semi-annually. Remove drain

plug and packing; discard packing.

-Inspect drain plug and oil for

metallic particles and foreign

matter. If metal chips are found,

cooling fan assembly may require

replacement (see pages 8-44,

8-45). Clean drain plug and apply

antiseize compound to threads

(see Item 4, Appendix C). Lubricate new packing with OE/HDO

oil. Install drain plug and packing in gearbox housing. Refill

gearbox with OE/HDO oil (approximately 10 ounces). Bring oil

level to top center of sight gage.

Change 3 2-89
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

[tern Interval Item To Procedure Not Mission

No. Be Capable It:

Inspected

68 Semi- Operate NOTE

Annual Air Box The purpose of this item is to exHeater ercise the vanes in the air box

Air Pump heater air pump.

Disconnect lead from fuel shutoff solenoid.

To prevent engine from starting,

pull fuel cutoff out (see your -10).

CAUTION

Air pump can be damaged if

switch is held on too long. Do not

exceed a total of 20 seconds of operation.

Have assistant crank engine and run

air pump at the same time intermittently for total of 20 seconds. Listen

for air pump operation (see your -10).

Connect lead to fuel shutoff solenoid.

Lubricate air motor with OE/HDO

every 1500 miles, semi-annually or as

required.

2-90 Change 3

TM 9-2350-261-20-1
69

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

SemiAnnual

Throttle

Controls

and

Transmission

Linkage

Operate hand throttle while pressing

on throttle pedal to check for binding.

Operate accelerator to check for binding in linkage.

Check transmission range selector

mounting screws for proper installation.

Check to see that the engine will start

only with the range selector in “N” position.

Move range selector through all gears

to check for binding.

Any binding, broken, cracked, missing or loose hardware.

Change 3 2-91
70

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Fuel System

Procedure

WARNING

 Air pressure in excess of 30 psi

(207 kPa) can injure personnel.

Don't direct pressurized air at

yourself or others. Always wear

safety goggles.

 Fuel can catch fire and burn you.

Do not smoke. Disconnect battery ground cables before you

work on fuel system. Wipe up

spilled fuel.

CAUTION

Don’t expose sealed areas to

steam for more than 15 minutes.

Check fuel tank for leaks. Repair or replace fuel tanks that leak (page 6-11 or

6-21) .

Tighten all fuel hoses, tubes and fittings that leak.

Replace fuel hoses and tubes that are

cracked, crimped or worn (see Chapter

6).

Replace cracked or stripped fittings

(see Chapter 6).

Any contaminated

tanks, fuel leaks or

cracked, broken,

stripped or crimped

hardware.

I

2-92 Change 3

TM 9-2350-261-20-1
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

71 Semi- Fuel Cutoff Operate fuel cutoff to check for bind- Any binding, broAnnual ing. If binding occurs, adjust (page ken, cracked, miss23-44). ing or loose hardware.

Operate accelerator to check for binding in linkage. If binding occurs, adjust (page 23-34).

Move range selector through all gears

to check for binding. If binding occurs,

adjust (page 23-55).

72 Semi- Fuel NOTE

Annual Filters Large amounts of sediment or Any fuel leaks.

debris may indicate contamination of fuel tanks.

Replace primary and secondary fuel

filter elements (page 6-128) every 1500

miles or annually. Remove rear power

plant access panels and drain fuel filter assemblies.

Remove and inspect primary filters/

shell first, then secondary filter/shell

Pre-fill primary and secondary shells

with fuel and install.

Change 3 2-93
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

73 Semi- Hydraulic NOTE

Annual System General checks and services are

the same for all carriers. See

Chapter 28 for specific component maintenance.

Replace ramp control or pump that

leaks (page 28-84 or 28-81).

Tighten or replace fittings on hydrau- Any hydraulic

lic fluid tank, ramp cylinder, pump, leaks, fluid not visand ramp control that are cracked or ible in sight gage,

leak. cracked, broken,

crimped, missing or

loose hardware.

WARNING

Hydraulic fluid is poisonous and

can be absorbed through your

skin. Wash off any hydraulic

fluid which contacts your skin.

Read Warning in manual front.

Check hydraulic tank, fluid level, and

service, if needed. Drain hydraulic

system tank and replace strainer

every 1500 miles, semi-annually or

when hydraulic fluid type is changed.

Lower ramp and remove drain plug.

Disconnect hose at filter elbow, remove four bolts and washers that secure filter adapter to tank. Remove

filter and packing from adapter.

Clean and inspect tank interior and

adapter with PD-680, Type II.

2-94 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable It:

Inspected

73 Semi- Hydraulic Install new filter and packing on Pump fails to raise

Annual System adapter. Secure adapter to tank with ramp or operate.

new washers and original bolts. ConContinued nect hose to adapter elbow. Fill tank

with FRH to bring level between max

and min on sight window (approximately two quarts).

Tighten tubes or hoses that leak.

Replace tubes or hoses that are

cracked, crimped or worn (page 28-91).

Replace ramp cylinder that leaks

(page 28-93).

Operate ramp and check for leaks.

Change 3 2-95
Item

No.

74

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Suspension Lockout system

(M741A1

only) (see

Chapter

28)

Procedure

Replace suspension lockout control

that leaks (page 28-87).

Tighten hoses and fittings that leak.

Replace hoses that are cracked,

crimped or worn (see Chapter 28).

Replace cracked or stripped fittings

(see Chapter 28).

2-96 Change 3

Not Mission

Capable It:

Any leaks, cracked,

crimped, broken,

missing or loose

hardware.

TM 9-2350-261-20-1
TM 9-2350-261-20-l

Item

No.

75

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Portable

Fire Extinguisher

Procedure

WARNING

You could be injured if cylinder

discharges when it is out of its

mounting bracket or is dropped.

Handle with great care.

Weigh portable fire extinguishers. Recharge or exchange fire extinguisher if

weight loss is more than 10 percent of

charged weight stamped on bottle. Fill

out DA Form 2407 for recharging or

DA Form 2402 to exchange cylinders.

Not Mission

Capable If:

Extinguisher is

missing o r seal/

hardware is missing or broke n

Change 3 2-97
TM 9-2350-261-20-l

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item

No.

76

Interval

SemiAnnual

Item To

Be

Inspected

Fixed

Fire Extinguisher

Procedure

NOTE

Extinguisher contains CO,

CAUTION

Fire extinguisher control valve

sealed with wire will not work,

Make sure seal wire is made out

of light copper.

Remove and weigh fixed fire extinguisher cylinder (page 42-13).

Recharge or exchange fire extinguisher if weight loss is more than 10

percent of charged weight stamped on

bottle.

Inspect fire extinguisher cylinder data

plate to ensure that a hydrostatic test

has been performed within the past 5

years. Faulty extinguishers or those

beyond the test time limit (5 years)

shall be declared unserviceable an replaced.

Not Mission

Capable If:

Extinguisher is

missing, seal/lockwire missing or broken, bottles overdue

hydrostatic test.

2-98 Change 4
TM 9-2350-261-29-l

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To

No. Be

Inspected

Procedure Not Mission

Capable If:

76 Semi- Fixe d

Annual Fire Ex -

CAUTION

tin- Inspect cylinder/bottle data to

guisher ensure the latest hydrostatic

test was performed within the

Continued past 5 years. Any cylinder/bot

tie beyond the test time limit

shall be declared unserviceable

and replaced.

Before reconnecting cylinder, operate

discharge handles to be sure cables

and controls work properly.

Install cylinder and replace copper

seal wires (page 42-5).

Replace discharge tubes that are

crimped, plugged or cracked (page

42-11).

Change 4 2-99
TM 9-2350-261-29-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be

Inspected

Capable If:

77 Semi- Batteries WARNING

Annual Battery posts an d cables

touched by metal objects can

short circuit and bum or injure

you. Use caution when you work

with tools or other metal objects.

Do not wear jewelry when you

work on electrical system. Electrical current can bum you. Remove battery ground lead before

you start task (page 13-2).

Clean batteries and battery box (page

13-20 or 13-22).

Replace batteries that leak, have

cracked cases, or burned post (page

13-16 or 13-18).

Any leaks, loose,

damaged, cracked,

broken or missing

battery or hardware.

Check and record specific gravity of

each cell (see TM 9-6140-200-14).

Specific gravity is

not within set standards.

Tropical Electrolyte

1.180-1.225

Temp Electrolyte

1.225-1.280

2-100 Change 3
TM 9-2350-261-20-1

Item

No.

77

Table 2-1. Unit Level Preventive

Interval

SemiAnnual

Item To

Be

Inspected

Batteries

Continued

Maintenance Checks and Services for M113A2 FOV

Procedure

WARNING

Gas from batteries can explode

and injure you. Do not allow

sparks near batteries. Battery

acid can blind or burn you. Do

not get acid on your skin or eyes.

Check electrolyte level. Iflow, add distilled water. Check battery cables for

frays, splits and security. Clean top of

batteries and coat terminals lightly

with grease.

Install batteries.

Not Mission

Capable If:

I

One or more batteries unserviceable,

missing, cables

frayed or broken.

Change 3 2-101
TM 9-2350-261-20-1

Item

No.

78

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Driver’s

Hatch

Procedure

Replace hard, cracked or cut cushioning pad (page 24-51).

Check periscope quick release for

smooth operation.

Check vision blocks for cracks and

chips (see your -10).

Replace vision blocks that have more

than 50 percent impairment (page

24-52).

Not Mission

Capable If:

Any missing lock

pins or latches that

fail to secure hatch

in any position.

2-102 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

79 Semi- Driver’s Replace damaged seat cushion (page Any missing, broAnnual Seat 24-129). ken or cracked seat

(less seat cushion),

Replace seat belt with cuts, frays or hardware or locking

broken buckle (page 24-129). mechanisms fail to

lock in any position.

WARNING

Seat can spring up and hit you

when vertical control handle is

released. Make sure you are sitting in the seat before releasing

vertical control handle.

check that seat vertical locking

mechanism and horizontal locking

mechanism work properly (see your

-10). Lubricate locking mechanism as

needed with OE/HDO.

Change 3 2-103
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

80 Semi- Personnel Repair or replace damaged seat cush- Any missing, broAnnual Seats ions (page 24-163, 24-165, or 24-167). ken or cracked seat

(less seat cushion),

hardware or cut,

frayed seat belts.

Repair or replace cut, broken or frayed

seat belts (page 24-163, 24-165 or

24-167).

Semi- Com- Replace damaged seat cushion (page Any missing, bro81

Annual manders 24-145). ken or cracked seat

Seat

(less seat cushion),

hardware or cut,

Replace cut, broken or frayed seat belt frayed seat belts, or

(page 27-145). locking mechanism

fails to lock in any

position.

WARNING

Seat can spring up and hit you

when vertical control handle is

release. Make sure you are sitting in the seat before releasing

vertical control handle.

Check for smooth operation of seat and

vertical locking mechanism (see your

-10). Lubricate locking mechanism as

needed with OE/HDO.

2-104 Change 3

TM 9-2350-261-20-1 
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

82 Semi- Com- Check platform lock to make sure the Any missing, broAnnual mander’s platform locks securely in various ver- ken or cracked platPlatform tical positions (see your -10). form hardware or

vertical locking

Check that platform securing catch mechanism fail to

and stowing catch work properly (see lock in any position.

your -10).

Lubricate locking mechanism and

catch as needed with OE/HDO.

Change 3 2-105
TM 9-2350-261-20-1

Item

No.

83

84

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

SemiAnnual

Item To

Be

Inspected

Commander’s

Cupola

Dome

Lights

Procedure

Replace cut, cracked, or hard cushioning pad. Replace vision blocks that

have more than 50 percent impairment (see your -10).

Replace cracked or chipped vision

blocks (page 24-79).

Check for smooth rotation of commanders cupola. Replace bearings as

required.

Check that all dome lights work properly. Troubleshoot faulty lights (page

3-117).

Tape frayed electrical leads and replace damaged connectors (page 14-3).

Not Mission

Capable If:

2-106 Change 3
Item

No.

85

86

Table 2-1.

Interval

SemiAnnual

SemiAnnual

TM 9-2350-261-20-1

Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item To

Be

Inspected

Blackout

Curtain

(M577A2

only)

Procedure Not Mission

Capable If:

Repair or replace curtain that is torn

or worn thin (page 24-171).

Replace curtain that has torn or missing straps (page 24-171).

Replace broken or missing fasteners

(page 24-171).

Data

Plates,

Decals,

Stencils,

and

Markers

Replace missing or damaged data

plates, decals, stencils and markers

(page 24-217).

Change 3 2-107
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

87 Semi- Carrier Lubricate steering control lever and

Annual shaft bearings every 1500 miles or

semi-annually with GAA.

Lubricate tachometer and speedometer shafts annually with GIA. Disconnect shafts at both ends (TM

9-2350-261-20), remove slotted washers from drive ends of cores and remove cores from instrument panel end

of shafts.

Clean, inspect and lubricate cores. Insert cores in shafts. Install slotted

washers and connect both ends of

shafts. If tachometer adapter has a

grease fitting, lubricate sparingly with

GIA.

2-108 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To

No.

Inspected

Procedure Not Mission

Capable If:

88 Semi- Final Insure all operational faults are cor- Any Class III leaks

Annual Road Test rected. Pay attention to any items that or operational

were previously recorded on DA Form faults.

2404.

Perform final carrier road test. Drive

carrier at least 5 miles (8 km).

Power plant can be damaged. Do

not pivot steering when carrier

is moving except on a track failure emergency.

Operate steering levers and check for

satisfactory response (see your -10).

With carrier operating at moderate

speed and steering levers released,

check for tendency to wander or pull to

one side. Release accelerator and apply brakes. Check if carrier stops

without pulling to one side. With carrier stopped on an incline, loch steering levers and move transmission to N

position. Check that brakes loch securely and carrier is held in place. On

level ground, operate pivot steer levers, one at a time, and check for pivot

steer.

Carrier fails to slow

doen or stop.

If steering or brakes do not operate

properly, see steering system

troubleshooting (page 3-176).

Check shifting of carrier in all ranges.

If carrier does not respond properly to

selected driving range, troubleshoot

gear selection system (page 3-177).

89 Deleted.

Change 4 2-109 (2-110 blank)

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

90 Semi- Capstan Check capstan drum and adapter. ReAnnual Drum place cracked or damaged drum or

and adapter. Tighten loose screws or reAdapter tainer.

(M113A2 If retainer can be unscrewed from and

M1059) drum, replace spring pin (page 34-2).

Change 3 2-111
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

91 Semi- Marine Check tarpaulin. Replace torn tarpauAnnual Recovery lin and missing or damaged straps.

K it

(M113A2

and

M1059)

Tarpaulin

a Semi- Anchors Check anchors. Replace anchors that

Annual have missing or broken eyes, tines or

handles.

b Semi- Towlines Check towlines and shackles. Replace

Annual and damaged or worn towlines and shackShackles les.

c Semi- Cables Checkable. Replace frayed or damAnnual aged cable.

d Semi- Clamps Check clamps. Tighten loose clamps.

Annual

e Semi- Stowage Check stowage brackets and hooks.

Annual Brackets Replace damaged or missing parts.

2-112 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

92 Semi- Chemical Perform preventive maintenance

Annual Agent checks and services every 750 miles

Auto- (1207 km), 75 hours, or semi-annually,

matic whichever comes first.

Alarm Kit Cable maintenance is limited to replacement of terminals (page 44-4).

Notify your supervisor for replacement of cable.

Remove distributor box from hull

(page 44-2). Check terminal board and

circuit breaker. Tighten loose connections. Install distribution box on hull

(page 44-2).

Change 3 2-113
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

92 Semi- Chemical NOTE

Annual Agent Additional data on Chemical

Auto- Agent Automatic Alarm Kit for

matic the M113 FOV can be found in:

Alarm Kit TM 3-6665-224-12 Operators and

Unit Manual

Continued TM 3-6665-274-20 Unit Maintenance Manual

TM 9-2350-261-24P Unit Repair

Parts Manual.

Check mounting screws on junction

box. Tighten loose screws to 72 lb-in (8

N.m) torque. Use torque wrench (Item

93, Appendix D) and socket set (Item

89, Appendix D).

Check grommet. Replace cracked or

worn grommet.

Check cable and circuit breaker terminals. Tighten loose connections. Replace damaged terminals (page 44-4).

Check cables. Replace frayed or

cracked cables (page 44-5).

2-114 Change 3

TM 9-2350-261-20-1 
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

92 Semi- Chemical Check brackets. Replace cracked or

Annual Agent broken brackets.

Automatic Check mounting screws. Tighten

Alarm Kit loose screws. Tighten screws to

264-285 lb-in (30-32 N.m) torque. Use

Continued torque wrench (Item 95, Appendix D)

and socket set (Item 89, Appendix D).

Check straps. Replace worn straps.

Change 3 2-115
TM 9-2350-261-20-1

Item

No.

93

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Electronic

Equipment

Heater

(M577A2

only)

Procedure

Tighten loose mounting screws and

clamps.

Remove control cover by turning screw

to the left.

Check flame detector switch and igniti o n control. See TM

9-2540-205-24&P.

Not Mission

Capable If:

2-116 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

94 Semi- Fuel Sys- Check heater fuel pump, fuel lines, Any fuel leaks.

Annual tem and connections. Tighten connections

(M577A2 that leak. Replace connections that

only) continue to leak.

95 Semi- Exhaust NOTE

Annual System Your carrier may be equipped

(M577A2 with new exhaust pipes which

only) do not require muffler clamps.

Check muffler for signs of exhaust Any exhaust leaks.

leaks. Tighten loose clamps.

Change 3 2-117
96

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Electrical

System

(M577A2

only)

Procedure

Check electrical leads and connectors

at heater, at control box, and at fuel

pump. Tape frayed leads. Replace

damaged connectors.

Check heater control box, switches,

and light bulb. Tighten or replace bad

switches and bulbs (page 31-11).

1

Not Mission

Capable If:

2-118 Change 3

TM 9-2350-261-20-1 

Item

No. 
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

97 Semi- Perform- Start, run and stop heater (see your Any faults that

Annual ante Test -10). During start cycle, check that

(M577A2)

would prevent switches and light work right. Check

for increase in blower speed after igni- proper operation.

tion.

During operation, check for unusual

noises. Check for differences between

high and low heat levels. When stopping heater, check for correct purge cycle. Check that indicator light operates properly. If heater does not operate as specified above, perform

troubleshooting (page 3-207).

Change 3 2-119
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

98 Semi- Engine Perform preventive maintenance

Annual Coolant checks and services every 750 miles

Heater (1207 km), 75 hours, semi-annually or

K it

whichever comes first.

Tighten mounting screws and clamps. Any fuel, coolant or

exhaust leaks.

Check heater inlet for debris.

Tighten mounting screws.

Check pump for leaks. Tighten connections that leak.

2-120 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval

No.

98 SemiAnnual

Item To

Be

Inspected

Engine

coolant

Heater

K it

Continued

Procedure Not Mission

Capable If:

Check heat exchanger and hose connections for leaks. Tighten connections that leak. Replace connections

that continue to leak.

Check hose. Replace damaged hose

(page 32-25).

Change 3 2-121
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

98 Semi- Engine Check clamps and mount flange for exAnnual coolant haust leaks. Tighten clamp. Replace

Heater bad flange gasket (page 32-41).

K it

Check exhaust pipe. Replace cracked

Continued or damaged pipe.

2-122 Change 3

TM 9-2350-261-20-1 
TM 9-2350-261-20-1

Item

No.

98

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Engine

coolant

Heater

K it

Continued

Procedure

Check fuel hoses, hose connections

and fuel pump for leaks. Tighten connections that leak. Replace connections that continue to leak.

Service fuel pump (page 32-10).

Tighten fuel pump mounting screws.

Not Mission

Capable If:

Change 3 2-123
TM 9-2350-261-20-1

Item

No.

98

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Engine

Coolant

Heater

K it

Continued

Procedure

Check electrical leads and connectors

at heater, at control box, and at fuel

pump. Tape frayed leads. Replace

damaged connectors (page 14-1).

Check heater control box, switches

and light bulb. Tighten or replace bad

switches and bulb (page 32-42).

Not Mission

Capable If:

2-124 Change 3
Item

No.

98

99

TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

SemiAnnual

Item To

Be

Inspected

Engine

Coolant

Heater

K it

Continued

Litter Kit

Procedure

Start, run and stop heater (see your

-10). During start cycle, check that

switches and lights work properly.

During operation, check for unusual

noises. Check for increase in coolant

temperature.

When stopping heater, check for correct purge cycle. Check that indicator

light operates properly. If heater does

not operate as specified above, perform troubleshooting (page 3-217).

NOTE

The carrier is not considered

NMC for an unserviceable litter

kit. If litter kit hardware is unserviceable, the kit should be removed to prevent use.

Perform preventive maintenance

checks and services every 750 miles

(1207 km), 75 hours, semi-annually or

whichever comes first.

Check hanger. Replace hanger if

cracked or if threads are stripped.

Check three repair links.

cracked links.

Check chain. Replace chain

are broken.

Check two litter straps.

Replace

if links

Replace

straps if torn or if buckles are damaged.

Not Mission

Capable If:

Any faults that

would prevent

proper operation.

Change 3 2-125
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item

No.

99

Interval

SemiAnnual

Item To

Be

Inspected

Litter Kit

Continued

Procedure

Check two litter hooks. Replace hooks

if cracked or if they can’t be recurved to

hold litters.

Check chain. Replace chain if links are

broken.

Check S hooks. Replace damaged S

hooks.

.

Check helical spring. Replace cracked

spring.

Check chain hook. Replace hook if

cracked or if it can’t be recurved.

Not Mission

Capable If:

2-126 Change 3
Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Change 3 2-127

TM 9-2350-261-20-1 
Item

No.

100

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Machine

Gun Armor

Shield Kit

Procedure

Check right armor shield. Repair bad

welds (TM 9-237). Repair or replace

cracked shield.

Check doors and two clips. Straighten

dents and bends. Replace cracked

door or clip.

Check left armor shield. Repair bad

welds (TM 9-237). Repair or replace

cracked shield.

Check doors and clips. Straighten

dents and bends. Replace cracked

door or clip.

Replace stowage strap or clamp if

damaged.

Not Mission

Capable If:

2-128 Change 3

TM 9-2350-261-20-1 
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

100 Semi- Machine Check periscope door and door bracket

Annual Gun Ar- on machine gun mount. Straighten

mor dents and bends. Replace cracked

Shield Kit parts.

Continued

Change 3 2-129
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

100 Semi- Machine Check left armor shield. Repair or reAnnual Gun Ar- place cracked shield.

mor

Shield Kit Check straps. Replace worn or damaged straps.

Continued

Check mounting arm. Replace damaged mounting arm.

Check gun strap. Replace damaged

strap.

Check bracket and clip. Replace

cracked or bent bracket.

Check right gun traverse restrictor.

Replace restrictor that has cracked rod

or spring.

2-130 Change 3
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

100 Semi- Machine Check interior mounting plate. ReAnnual Gun Ar- place cracked or damaged parts.

mor

Shield Kit Check strap, mounting plate and

pintle socket. Replace cracked or damContinued aged parts.

Change 3 2-131
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Item Interval Item To Procedure Not Mission

No. Be Capable If:

Inspected

101 Semi- Personnel Tighten loose mounting screws and Any fuel, coolant or

Annual Heater clamps. exhaust leaks.

K it

Remove control cover by turning two

screws to the left.

Check flame detector switch and igniti o n control (see TM

9-2540-205-24&P).

Check heater fuel pump, fuel lines and

connections for leaks. Replace connections that continue to leak.

Check for signs of exhaust leaks.

Tighten clamps.

2-132 Change 3
TM 9-2350-261-20-1

Item

No.

101

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

Interval

SemiAnnual

Item To

Be

Inspected

Personnel

Heater

Procedure

Check electrical leads and connectors

at heater, at heater control box and at —

fuel pump. Tape leads if frayed. Replace damaged connectors (page 14-1).

Check heater control box, switches

and light bulb. Tighten or replace bad

switches and bulbs (page 29-43).

Start, run and stop heater (see your

-10). During start cycle, check that

switches and lights work properly.

Check for increase in blower speed after ignition.

During operation, check for unusual

noises. Check for differences between

high and low heat levels.

When stopping heater, check for correct purge cycle. Check that indicator

light operates properly. If heater does

not operate as specified above, perform troubleshooting (page 3-207).

Not Mission

Capable If:

I

Change 3 2-133

 Kit 

Continued 
TM 9-2350-261-20-1

Table 2-1. Unit Level Preventive Maintenance Checks and Services for M113A2 FOV

2-134 Change 3
Item

No.

104

105

106

106

Table 2-1. Unit Level Preventive

Interval

SemiAnnual

SemiAnnual

SemiAnnual

SemiAnnual

Item To

Be

Inspected

Turn Signal

Lights,

stop

Lights,

and

Blackout

stop

Lights

Reflectors

Electrical

Wiring

Slave Cable

TM 9-2350-261-20-1

Maintenance Checks and Services for M113A2 FOV

Procedure

Test operation of lights with signal

control in all four operating positions.

Repair or replace damaged or discolored lens. Repair or replace defective

lights, control, flasher and lights.

Check reflector lens. Replace damaged or missing lens.

Tighten electrical connections and

mounting brackets. Tape frayed harness. Replace missing or damaged

connectors.

Check the slave

cap for damage,

corrosion.

cable receptacle and

burnt condition and

Not Mission

Capable If:

Change 3 2-135
TM 9-2350-261-20-1

PMCS PARTS LIST 

The following list of parts is required when performing semi-annual, annual, or on-condition PMCS.

The semi-annual parts list contains the mandatory replacement parts for one semi-annual PMCS. The

annual parts list contains the mandatory replacement parts for one semi-annual PMCS combined with

the mandatory replacement parts for one (1) annual PMCS. The on-condition parts list contains replacement parts that are required when engine and transmission oil changes are directed by the Army Oil

Analysis Program (AOAP) Laboratory. If AOAP Laboratory support is not available, change oil and filter elements/gaskets every 1500 miles or annually.

.

1. MS28775-126 5305-00-702-1048 Packing 1

ANNUAL (1500 Miles) .

ITEM

NO PART NUMBER NSN NOMENCLATURE QTY

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

MS28775-126

10874832

8756978

MS28775-231

5574161

CW226MP

5574126

1503536

T552

K-22002

5330-00-702-1048

4730-00-766-4714

5310-00-655-9669

5330-00-527-7025

5330-00-846-9841

2910-00-287-1912

5330-00-612-3123

5330-00-551-0433

2940-00-745-7730

2940-00-755-6584

Packing

Filter

Key Washer

Packing

Gasket

Filter, Element

Gasket

Gasket

Filter, Element

Filter, Element

(M741A1 Only)

1

1

4

1

1

1

1

1

1

1

ON-CONDITION (1500 Miles) .

ITEM

N O PART NUMBER NSN NOMENCLATURE Q t y

1. MS35802-3 2940-00-580-6283 Filter, Element 1

2. 5571024 5330-00-290-7860 Gasket 1

3. 5187310 5330-01-604-8094 Packing 1

4. MS35769-21 5330-00-514-3289 Gasket 1

5. C-1670 2940-00-678-0641 Filter, Element 1

6. 6772423 5330-00-064-6598 Packing 1

7. 6772373 5330-00-999-3756 Packing 1

2-136 Change 3
TM 9-2350-261-20-l

LUBRICATION TABLE

M113A2 FOV

“Engine applications include: engine, transfer gearcase, differential, final drives, fan gearbox, rampwire

rope, oil can points.

Change 4 2-137
TM 9-2350-261-20-l

LUBRICATION TABLE

M113A2 FOV

(Continued)

CHART B - LUBRICANTS FOR TRANSMISSION APPLICATIONS

CHART C - FLUIDS FOR HYDRAULIC SYSTEM APPLICATIONS

2-138 Change 4
TM 9-2350-261-20-1

LUBRICATION TABLE

M113A2 FOV

(Continued)

Change 3 2-139
TM 9-2350-261-20-1 

CHAPTER 3

TROUBLESHOOTING 

Section I. HOW TO USE TROUBLESHOOTING 

PURPOSE

The purpose of unit maintenance level troubleshooting is to diagnose carrier problems which are reported to

unit maintenance. Troubleshooting tasks in this manual are common to all earners except where indicated.

You should not begin unit maintenance troubleshooting until all operator troubleshooting procedures have

been completed. You will perform four actions in unit maintenance troubleshooting:

1. Before starting a troubleshooting task, verify that the reported problem is present in the carrier.

2. After verifying the symptom, find the part that is causing the problem.

3. Replace or adjust that part.

4. Check to make sure the problem no longer exists, and that there are no other problems.

DEFINITIONS AND DESCRIPTIONS OF TROUBLESHOOTING PROCEDURES

Troubleshooting tasks always have a beginning and an end. You will use task steps, test procedures, indexes,

maintenance tasks, and other technical manuals to troubleshoot. Troubleshooting uses the following terms

that are not used in other kinds of tasks:

1.

2.

3.

FAULT: The part that is not operating correctly and is causing the problem.

SYMPTOM: The problem reported to unit maintenance.

VERIFY NO FAULTS FOUND: After you have completed the corrective action, you must verify

that no faults exist. If the fault condition still exists, then the fault is not fixed or there is another

fault. If this happens, start at the beginning of the troubleshooting procedure until you find and correct

all faults. Always operate the system and/or earner to make sure that you have corrected the reported

problem. If troubleshooting does not identify a faulty part, the earner is defective beyond the level of

unit maintenance.

3-1
TM 9-2350-261-20-1 

TROUBLESHOOTING BASIC

Troubleshooting Procedure

A troubleshooting procedure serves as a starting point for your troubleshooting work. You will branch in and

out of procedures as you work to find a fault. Also, you will correct the fault, and check that the fault has been

corrected. The parts of a troubleshooting procedure are given below.

Legend to Sample Above

TITLE

INITIAL SETUP

TASK STEPS

ILLUSTRATIONS

QUESTIONS

REFERENCE LETTER

This is the name of the procedure.

This tells you the tools, materials/parts, personnel, references,

and equipment conditions needed to do the procedure.

These boxes give you step-by-step instructions.

These help you locate and identify parts.

This is the last step in YES blocks. The answer to this question

will direct you to the next block.

This will send you to the correct block to continue with the troubleshooting procedure.

3-2
TM 9-2350-261-20-1

TROUBLESHOOTING BASICS (cont)

Locating the Correct Troubleshooting Procedure

1. Carrier arrives at shop.

2. Read DA form 2404.

3. Verify that the problem on DA form 2404 exists.

4. Look up the carrier symptom in Troubleshooting Task Index, Section II, in this chapter, and go to

that task.

Doing the Troubleshooting Procedure

5.

6.

7.

8.

9.

10.

11.

12.

13.

14.

Make sure you have all items in INITIAL SETUP.

Perform required action(s) in Equipment Conditions.

Complete the first block of task steps.

Refer to system schematic or diagram for system components, detail, and clarification.

Answer the question at the bottom of the first block.

Follow YES or NO arrows to the next block.

Move from block to block. Answer questions and follow instructions. You may be directed to:

do futher checks and tests on parts;

go to another manual and do tasks; or

go to another task in this manual.

NOT E

After completing the actions called for on

another page or manual, return to the point

in the troubleshooting procedure where you

left off.

Located the fault in the carrier or part, and perform the corrective action.

Check to make sure fault is corrected, and there are no new faults.

Button up by reinstalling items in Equipment Conditions after finishing the troubleshooting task.

3-3
TM 9-2350-261-20-1 

TROUBLESHOOTING SAMPLE 

The following sample takes you through a typical troubleshooting procedure.

Finding the Right Troubleshooting Procedure 

A carrier arrives at the shop. The DA form 2404 shows that the engine cranks slowly. Engine cranks slowly is

part of the carrier Engine System. Therefore, you lookup engine cranks slowly listed under Engine System in

Troubleshooting Task Index, Section II, in this chapter.

TM 9-2350-261-20-1

Section II. TROUBLESHOOTING

TASK INDEX

ENGINE SYSTEM

Engine Overheats . . . . . . . . . . . . . . . . . . . . . ...3-10

Engine Overcools . . . . . . . . . . . . . . . . . . . . . . . ...3-14

Engine Does Not Crank . . . . . . . . . . . . . . ...3-15

Engine Cranks Slowly . . . . . . . . . . . . . . . . . ...3-25

Engine Cranks But Will Not Start ...3-30

Engine Cranks But Will Not Start

Below 40° (Air Box Heater Is Used) ..3-34

Engine Runs Rough, Stab, Or Does

Not Put Out Full Power . . . . . . . . . . . . . . ...3-44

Engine Oil Low Pressure Indicator

Fails To Go Off After Engine Starts ..3-50

Engine Does Not Remain At Idle

RPM With Suspension Lockout

System Engaged (M741A1 Only) . . . . ...3-51

Engine Fuel System Schematic . . . . . . ...3-52

Starting System Schematic . . . . . . . . . . . ...3-53

Air Box Heater System Schematic ....3-54

CHARGING SYSTEM

Transmission Oil Hi Temp Indicator

Comes On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-71

No Exterior Lights Operate . . . . . . . . . . ...3-73

Blackout Drive Light Does Not Work .3-75

Service Headlight Do Not Operate . ..3-78

Infrared Headlight(s) Does Not

operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-83

Service And/Or Blackout Stop

Lights Malfunction . . . . . . . . . . . . . . . . . . . . . ...3-89

Blackout Marker Light(a) And/Or

Tail Light(s) Do Not Operate . . . . . . . . ...3-93

Service Tail Light Doss Not Operate .3-98

Trailer Lights Do Not Operate . . . . ...3-100

Horn Does Not Operate . . . . . . . . . . . . ...3-102

Instrument Panel Illumination Lights 

Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-107

Dome Light(s) Work Improperly . . . ...3-110

Infrared Periscope Works Improperly 3-112

Radio(s) Does Not Work . . . . . . . . . . . . ...3-116

Charging System Malfunction . . . . . . ...3-55 Dome Lights Malfunction

100 Amp Engine Charging System (M577A2 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-117

Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-65 Right Rear Utility

200 Amp Engine Charging System Outlet/Admittance Buzzer Works

Schematic 3-66 Improperly (M577A2 Only) . . . . . . . . . ...3-122. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

200 Amp Engine Charging System Left Rear Utility Outlet/Blower Does

Schematic (M981 Only) . . . . . . . . . . . . . . . ...3-67 Not Work (M577A2 Only) . . . . . . . . . . ...3-125

ELECTRICAL SYSTEM Master Switch On Indicator Does

Not Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-129

Differential Hi Oil Temp Indicator

Comes On Fuel Level Indicator Malfunctions . ..3-134. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . High Beam Indicator Light

Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-140

3-8

3-4

Task 

3-68 
TM 9-2350-261-20-1 

HOW TO USE TROUBLESHOOTING (cont)

This is the procedure you want.

Check the title to make sure you are troubleshooting the correct system for the problem. Next, read the

INITIAL SETUP carefully. Make sure you have all the items listed in the INITIAL SETUP. Some access

steps in Equipment Conditions may not need to be performed depending on the fault location. The INITIAL

SETUP also includes tools and references. In instances where STE/ICE-R troubleshooting may be more

advantageous and time saving for the user, cross references to Section III, STE/ICE-R troubleshooting are

given under references, and Section III, contains references to standard troubleshooting procedures. It’s up to

you to decide which are necessary for your particular problem.

Change 1 3-5
TM 9-2350-261-20-1 

Now you’re ready to begin troubleshooting. Look at the first block. Read and do steps 1 through 4. Let’s say

the multimeter reads more than 19 volts. So the answer to the question, “Does multimeter read more than 19

volts,” is YES. Follow the YES arrow to the next box. Do steps 1 and 2. Lets say the multimeter reads more

than 17 volts. So the answer to the question,. “Does multimeter read more than 17 volts,” is YES. Follow the

YES arrow to the reference letter 

This is how 

reads more than

appears on the following page. Do steps 1 and 2. In this sample, let’s say the multimeter

1/2 volt. So the answer to step 2 is NO. Follow the NO arrow to the next block.

3-6 Change 1
TM 9-2350-261-20-1 

HOW TO USE TROUBLESHOOTING (cont)

The NO arrow takes you to this box. You have found the fault in the starter ground. This box gives you the

step to correct the fault. Do step 1. It tells you to go to another task in the manual. Go to the page shown and

perform the task. Return to this box when you have completed the task.

1. Replace/repair starter

ground as necessary

(page 10-4).

2. Verify no faults found.

Step 2 in this box is “Verify no faults found.” You must check to make sure you have correctly freed the fault.

After no faults found has been verified, return earner to operation. This is the end of the troubleshooting

sample.

Change 1 3-7
TM 9-2350-261-20-1 

Section II. TROUBLESHOOTING 

TASK INDEX 

Tas k Page

 ENGINE SYSTEM

Engine Overheats . . . . . . . . . . . . . .... 3-10

Engine Overcools . . . . . . . . . . . ........ . ... 3-14

Engine Does Not Crank . . . . . . . . . . . . . . . ..3–15

Engine Cranks

Engine Cranks

Engine Cranks

Below 40° (Air

slowly . . . . . . . . . . . . . . . . . ...3-25

But Will Not Start . ...3-30

But Will Not Start

Box Heater Is Used) ..3-34

Engine Runs Rough, Stalls, or Does

Not Put Out Full Power . . . . . . . . . . . . . . ...3-44

Engine Oil Low Pressure Indicator

Fails to Go Off After Engine Starts . . 3–50

Engine Does Not Remain At Idle

RPM With Suspension Lockout

System Engaged (M741A1 Only) . . . . ...3-51

Engine Fuel System Schematic . . . . . . . . . 3–52

Starting System Schematic . . . . . . . . . . . . . . 3–53

Air Box Heater System Schematic . . . . . 3–54

CHARGING SYSTEM

Charging System Malfunctions . . . . . . ...3-55

Disconnect/Connect Alternator

(Generator) Test Kit . . . . . . . . . . . . . . . . ...3-64.1

200 Amp Charging System

Operational Check . . . . . . . . . . . . . . . . . . . . . 3-64.4

200 Amp No Charge/Regulation

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 3–64.7

200 Amp Full Field Charge

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 3–64.9

200 Amp Over Voltage

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . ..3–64.11

Task Page

100 Amp Engine Charging System

Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . ... 3-65

200 Amp Engine Charging System

Schematic . . . . ..... . . . . . . . . . . . . . . . . . . . . .. 3-66

200 Amp Engine Charging System

Schematic (M981 Only) . . . . . . . . . . . . . . . ...3-67

ELECTRICAL SYSTEM

Differential Hi Oil Temp Indicator

Comes On . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-68

Transmission Oil Hi Temp Indicator

Comes On . . . . . . . .. . . . . . . . . . . . . . .. 3-71

No Exterior Lights Operate . . . . . . . . . . . . . 3–73

Blackout Drive Light Does Not Work .3-75

Service Headlights Do Not Operate . ..3-78 

Infrared Headlight(s) Does Not

Operate . . . . . . . . . . . . . . ..... . . . . . .... . ... 3-83

Service and/or Blackout Stop Lights

Malfunction . . . . . . . . . . . . ..... 3-89

Blackout Marker Light(s) and/or

Tail Light(s) Do Not Operate . . . . . . . . . . . 3–93

Service Tail Light Does Not Operate .3-98

Trailer Lights Do Not Operate . .... 3-100

Horn Does Not Operate . . . . . .... . . . . . 3-102

.

Instrument Panel Illumination Lights

Malfunction . ........ . . ....... . . . . . . . . 3-107

Dome Light(s) Work Improperly . . . ...3-110

Infrared Periscope Works Improperly 3-112

Radio(s) Does Not Work . . . . . . . . . . . . ...3-116

Dome Lights Malfunction

(M577A2 Only) . . .... . . . . . . . . . . . . . . . . . 3-117

3-8 Change 1
Task Page

 ELECTRICAL SYSTEM (Cont)

Blackout Dome Lights Do Not Work

(M1068 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-120.2

Right Bear Utility Outlet/Admittance Buzzer Works Improperly

(M577A2 and Ml068 Only) . . . . . . . . . . . 3-122

Left Rear Utility Outlet/Blower

Does Not Work

(M577A22 and M1068 Only) . . . . . . . . . . . 3-125

Master Switch On Indicator Does

Not Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-129

Fuel Level Indicator Malfunctions . . . 3-134

High Beam Indicator Light

Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-140

Battery/Generator Indicator

Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-143

Coolant Temperature Indicator

Malfunctions . . . . . . . . . . . . . . . . . ........ 3-144

Engine Oil Low Pressure Indicator

Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-148

Transmission Oil Hi Temp Indicator

Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-153

Differential Oil Hi Temp Indicator

Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-159

Suspension Lockout Indicator

Malfunctions (M741A1 Only) . . . . . . . . . 3-164

Turret Power/Proximity Switch

Troubleshooting (M741A1 Only) . . . . . . 3-168

Indicators (All Carriers) . . . . . . . . . . . . . . . 3-171

Electrical System Schematic . . . . . . . . . . 3-172

Turret Power/Proximity Switch

System Schematics (M741A1 Only) . . 3-173

Additional Electrical System

Schematics (M577A2 Only) . . . . . . . . . . . . 3-174

Additional Electrical System

Schematics (M981 Only) . . . . . . . . . . . . . . . 3-175

TM 9-2350-261-20-1

Task Page

STEERING SYSTEM I

Steering/Brakes Malfunction . . . . . . . . . . 3-176

Carrier Does Not Move In Any Shift

Lever Position . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-177

Carrier Does Not, Pivot . . . . . . . . . . . . . . . . 3-179

Power Train/Steering/Brakes/Gear

Selection/Throttle Diagrams . . . . . . . . . . 3-181

RAMP SYSTEM

Ramp Will Not Lower . . . . . . . . . . . . . . . . . . 3-182

Ramp Operation Is Slow or

Sluggish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-184

Ramp Will Not Raise or

Free Falls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-185

Ramp Hydraulic System

Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-188

SUSPENSION SYSTEM

Suspension Lockout Does Not

Extend (M741A1 Only) . . . . . . . . . . . . . . . . 3-189

Suspension Lockout Does Not Hold

(M741A1 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . 3-192

Suspension Lockout Does Not

Release (M741A1 only) . . . . . . . . . . . . . . . . 3-194

Suspension Lockout System

Schematic (M741A1 Only) . . . . . . . . . . . . . 3-195

SMOKE GRENADE SYSTEM

Smoke Grenade Launcher(s)

Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-196

BILGEPUMP S

Front and/or Rear Bilge Pump(s)

and/or Lights Do Not Operate . . . . . . . 3-201

Bilge Pump System Schematic . . . . . . . 3-206

GO TO NEXT PAGE

Change 3 3-8.1
TM 9-2350-261-20-1

Tas k Page

 PERSONNEL HEATER I

Personnel Heater Malfunctions . . . . . . . 3-207

 WINTERIZATION SYSTEM

Coolant Heater Malfunctions . . . . . . . . . . 3-217

ELECTRICAL POWER EQUIPMENT

(M1068 ONLY) I

Power Control Enclosure Al

DC Input/Output Inoperative . . . . . . .3-226.1

No AC Power From Tent Interface

Panel A5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-226.14

No DC Power From Tent Interface

Panel A5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-226.19

No Power From Roadside AC Power

Extension Box A6 . . . . . . . . . . . . . . . . . . . . 3-226.23

Task Page

Fluorescent Lights Do Not

Operate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-226.66

Vehicle Batteries Discharge With

External AC Power Applied . . . . . . . 3-226.69

Vehicle Will Not Accept

External AC Power . . . . . . . . . . . . . . . . ..3-226.76

Vehicle Will Not Accept

Inverter AC Power . . . . . . . . . . . . . . . . . . .3-226.80

No Power To DC Circuits . . . . . . . . . .3-226.91

No Power To AC Circuits . . . . . . . . . .3-226.97

No DC Output From DC Power

Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-226.109

No AC Power From Inverters . . . 3-226.114

COMMUNICATION EQUIPMENT

(M1068 ONLY)

No Power From Curbside AC Power

Extension Box A7 . . . . . . . . . . . . . . . . . . . . 3-226.27

No Power From DC Power

Extension Box A8 . . . . . . . . . . . . . . . . . . . . 3-226.31

No Data Output From Data

Panel A12 . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-226.120

No LAN Output From Data

Panel A12 . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-226.122

No Power From DC Power

Extension Box A9

(All Except Jack J23) . . . . . . . . . . . . . . . 3-226.35

No Power From DC Power

Extension Box AS,

Jack J23 (JTIDS) . . . . . . . . . . . . . . . . . . . . 3-226.39

No Data Output From Data

Panel A13 . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-226.126

No LAN Output From Data

Panel A13 . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-226.128

Phone Extension Box A14

Post(s) Inoperative . . . . . . . . . . . . . . . . . 3-226.132

No DC Power To Single Point LAN

Ground Box Al5 . . . . . . . . . . . . . . . . . . . ..3-226.43 SPEEDOMETER/TACHOMETER

No Power From UPS Power Speedometer Malfunctions . . . . . . . . . . . . . 3-227

Extension Box Al6 . . . . . . . . . . . . . . . . . . 3-226.45 Tachometer Malfunctions . . . . . . . . . . . . . . 3-230

No Power From UPS Power

Extension Box Al7 . . . . . . . . . . . . . . . . . . 3-226.48 CHEMICAL AGENT AUTO ALARM

SYSTEM

No AC/DC Input To ATCCS

UPS Power Box . . . . . . . . . . . . . . . . . . . . . . 3-226.51

In Blackout Mode, Fluorescent

Lights Operate Incorrectly . . . . . . . . . 3-226.57

Chemical Agent Auto Alarm

Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-23 3

Chemical Agent Auto Alarm System

Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-236

3-8.2 (3-9 blank) Change 4

TM 9-2350-261-20-1

ENGINE OVERHEATS

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Tube Pipe Pitting Kit (Item 25, App D)

Radiator Testing Kit (Item 51, App D)

Material&Parts:

Suitable container

Personnel Required:

Unit Mechanic

Helper (H)

References:

See your -10

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Driver’s power plant access panels removed

(see your -10)

Power plant rear access panels removed

(see your -10)

1. Does engine boil over? 1. Verity proper operation of

I coolant TEMP indicator

YES before continuing. See task:

Coolant TEMP indicator

malfunctions (page 3-144).

2. Verify no faults found.

1. Observe coolant TEMP indicator (see your -10).

2. Does coolant temp indicator indicate overheating?

 1. Verify proper operation of

coolant TEMP indicator

before continuing. See task

Coolant TEMP indicator

malfunctions (page 3-144).

2. Verify no faults found.

2. Are all parts and seals in good condition?

1. Inspect power plant front access door, driver’s

access panel, rear access panel, and bottom access

cover seals (see your -10).

1. Inspect power plant coolant hoses, radiator, and

fittings for leaks.

2. Is power plant free of coolant leaks?

1. Repair, Replace and/or

adjust faulty parts and/or

seals as required

(page 24-7).

2. Verify no faults found.

1. Repair cooling

(page 8-1).

2. Verify no faults found.

3-1 0
PAGE 3-13

page 8-35

page 8-9

TM 9-2350-261-20-1

3-11
page 8-28

TM 9-2350-261-20-1

3-12
TM 9-2350-261-20-l

1. Allow system to remain pressurized for 5 minutes.

2. Does pressure drop less than 1 psi?

1. Internal coolant system

2. Notify your supervisor.

1. Has thermostat been replaced? 1. Replace thermostat

(page 8-15).

YES 2. Verify no faults found.

1. Replace coolant pump (page 8-11).

2. Verify no faults found.

1. Stop engine (see your -10).

2. Remove ventilating fan drive belt (page 8-35).

3. Manually rotate ventilating fan drive shaft

pulley (1).

4. Does fan spin freely? 

1. Faulty transfer gear case.

2. Notify your supervisor.

 1. Fan does not spin.

2. Notify your supervisor.

3-1 3
TM 9-2350-261-20-1

ENGINE OVERCOOLS

INITIAL SETUP

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Install air inlet grill curtain (see your-10).

2. Run engine for 3 to 5 minutes at 800 RPM with

steering levers locked and transmission in 2-3 range.

3. Stop engine (see your-10).

4. Does engine reach operating temperature?

1. Go to coolant TEMP indicator malfunctions

(page 3-144).

1. Replace engine thermostat

(page 8-15).

2. Verify no faults found.

3-14 Change 4
TM 9-2350-261-20-1

ENGINE DOES NOT CRANK

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Socket Wrench Set (Item 89, App D)

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

Helper (H)

References:

see your -10

STE/ICE-R engine will not crank

troubleshooting (page 3-270)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant access door open (see your -10

Driver’s power plant access panel removed

(see your -10)

1. Turn MASTER SWITCH to ON (see your-10).

2. Remove cover (1) from auxiliary power receptacle (2).

3. Measure voltage between positive (+) terminal (3) and

negative (-) terminal (4).

4. Does multimeter read more than 17 volts?

GO TO NEXT PAGE

Change 1 3-15
TM 9-2350-261-20-1

1.Turn MASTER SWITCH OFF (see your -10).

2. Remove engine harness plug (1) from front main

harness jack (2) at carrier bulkhead.

3. Turn MASTER SWITCH to ON.

4. Depress start switch and hold for test.

5. Measure voltage between front main harness jack (2)

socket H (3) and ground.

6. Does multimeter read less than 17 volts?

7.Turn MASTER SWITCH OFF (see your -10).

3-16 Change 4
TM 9-2350-261-20-1 

1. Remove front main harness circuit 14 plug (1) from

neutral start switch jack (2).

2. Measure voltage between circuit 14 plug (1) and

ground.

3. Does multimeter read more than 17 volts?

1. Turn MASTER SWITCH to OFF.

2. Remove front main harness circuit 74 plug (1) from

neutral start switch jack (2).

3. Measure resistance between neutral start switch

jacks (2 and 3).

4. Does multimeter read 0 ohms?

GO TO NEXT PAGE

3-17

GO TO PAGE 3-24

GO TO PAGE 3-24
TM 9-2350-261-20-1 

1.

2.

3*

4.

5.

Install circuits 14 and 74 plugs on neutral start

switch jacks.

Remove instrument panel for access (page 11-2).

Remove circuit 74A/74 plug (1) from start switch

(2).

Measure resistance between start switch (2) jack

pins with start switch depressed.

Does multimeter read 0 ohms?

1. Turn MASTER SWITCH to ON.

2. Measure voltage between circuit 74 pin (1) and

ground.

3. Does multimeter read more than 17 volts?

4. Turn MASTER SWITCH to OFF.

1. Repair front main wiring harness circuit 74A

(page 14-3).

2. Verify no faults found.

1. Replace start switch

(page 11-10).

2. Verify no faults found.

1. Repair front main wiring

harness circuit 74

(page 14-3).

2. Verify no faults found.

3-18
TM 9-2350-261-20-1 

1. Install engine harness plug in front main harness

bulkhead jack.

2. Turn MASTER SWITCH to ON.

3. Depress start switch and hold for test.

4. Measure voltage between starter solenoid (1) circuit

74A terminal (2) and ground.

5. Does multimeter read more than 17 volts?

1. Measure voltage between starter solenoid (1) cable

6 terminal (2) and ground.

2. Does multimeter read less than 17 volts?

3. Turn MASTER SWITCH to OFF.

1. Repair engine harness

circuit 74A (page 14-3).

2. Verify no faults found.

GO TO PAGE 3-21

GO TO NEXT PAGE

3-19
1. Turn MASTER SWITCH to OFF.

2. Remove engine harness circuit 6 plug (1) from front

main harness circuit 6 jack (2) at carrier bulkhead.

3. Inspect plug and jack for corrosion and/or other

damage.

4. Are parts in good condition?

YES

1. Remove eight nuts (1), washers (2), and screws (3)

from master switch panel (4). Pull panel away

from distribution box (5).

2. Inspect cable 49 (6) from master switch to

distribution box.

3. Are cable and cable ends free from corrosion and

1. Repair engine wiring

harness or front main

wiring harness circuit 6

(page 14-3).

2. Verify no faults found.

1. Repair master power to

distribution box cable

(page 14-9).

2. Install master switch panel

on distribution box.

3. Verify no faults found.

3-20

damage?

TM 9-2350-261-20-1 
TM 9-2350-261-20-1 

1. Inspect engine harness circuit 6 (1) leads on

distribution box (2).

2. Are leads and terminal free of corrosion and damage?

1. Verify no faults found.

1. Manually rotate engine camshaft pulley (1) (use

breaker bar. socket wrench set, and extension).

2. Does engine rotate?

1. Replace engine starter assembly (page 10-2).

2. Verify no faults found.

1. Repair engine harness

circuit 6 (page 14-3).

2. Install master switch panel

on distribution box.

3. Verify no faults found.

1. Engine or power train

seized.

2. Notify your supervisor.

3-21
TM 9-2350-261-20-1 

1. Remove front main harness circuit 74A plug (1)

from neutral start switch jack (2).

2. Turn MASTER SWITCH to ON.

3. Measure voltage between jack (2) and ground with

start switch depressed.

4. Does multimeter read less than 17 volts?

5. Turn MASTER SWITCH to OFF.

YES

1. Remove front main wiring harness circuit 74 plug

(1) from neutral start switch switch jack (2).

2. Measure voltage between circuit 74 plug (1) with

start switch depressed.

3. Does multimeter read less than 17 volts?

1. Repair front main wiring

harness circuit 74A

(page 14-3).

2. Verify no faults found.

3-22

GO TO PAGE 3-24 
TM 9-2350-261-20-1 

switch.

2. Remove instrument panel for access (page 11-2).

3. Remove circuits 14/74 plug (1) from start

4. Measure resistance between start switch (2) jack

pins with start switch depressed.

5. Does multimeter read 0 ohms?

YES

1. Turn MASTER SWITCH to ON.

2. Measure voltage from panel power harness circuit

14 plug pin (1) and ground.

3. Does multimeter read more than 17 volts?

4. Turn MASTER SWITCH to OFF.

1. Replace start switch

(page 11-10).

2. Verify no faults found.

1. Repair panel wiring

harness circuit 14

(page 14-3).

2. Verify no faults found.

1. Repair front main wiring harness circuit 74

(page 14-3).

2. Verify no faults found. I

3-23

1. Install circuit 14 and 74A plugs on neutral start

switch (2).
TM 9-2350-261-20-1 

1. Has neutral start switch been adjusted?

1. Replace neutral start switch (page 23-53).

2. Verify no faults found.

1.

2.

3.

4.

5.

6.

Remove instrument panel for access (page 11-2).

Remove front main wiring harness circuit 14 plug

(1) from panel power harness circuit 14 jack (2).

Turn MASTER SWITCH to ON.

Measure voltage between circuit 14 jack (2) and

ground.

Does multimeter read less than 17 volts?

Turn MASTER SWITCH to OFF.

1. Repair panel power wiring harness (page 14-3).

2. Verify no faults found.

3-24

1. Adjust neutral start switch

(page 23-53).

2. Verify no faults found.

1. Repair front main wiring

harness circuit 14

(page 14-3).

2. Verify no faults found.
TM 9-2350-261-20-1 

ENGINE CRANKS SLOWL Y

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

Helper (H)

References:

See your -10

STE/ICE-R starter circuit troubleshooting

(page 3-259)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant access door open (see your -10)

1. Remove cover (1) from auxiliary power receptacle (2).

2. Turn MASTER SWITCH to ON (see your -10).

3. Measure voltage between positive (+) terminal (3) and

negative (-) terminal (4) with engine cranking for 3 to 5

seconds.

4. Does multimeter read more than 19 volts?

1. Measure voltage between starter positive (+) terminal

(1) and ground with engine cranking for 3 to 5 seconds.

2. Does multimeter read more than 17 volts?

GO TO NEXT PAGE

GO TO NEXT PAGE

GO TO PAGE 3-27

Change 1 3-25
TM 9-2350-261-20-1 

1. Measure voltage between starter ground (1) and

carrier ground with engine cranking for 3 to 5

seconds.

2. Does multimeter read less than 1/2 volt?

1. Replace starter (page 10-2).

2. Verify no faults found.

1. Replace/repair starter

ground as necessary

(page 10-4).

2. Verify no faults found.

1. Turn MASTER SWITCH to OFF.

2. Clean, Inspect, and Repair earner batteries

(page 13-13 or 13-16).

3. Turn MASTER SWITCH to ON.

4. Measure voltage between positive (+) terminal (3)

and negative (-) terminal (4) with engine cranking

for 3 to 5 seconds..

5. Does multimeter read more than 19 volts?

1. Verify no faults found.

3-26

PAGE 3-29
TM 9-2350-261-20-1 

1.

2.

3.

Remove engine harness circuit 6 plug (1) from

main harness circuit 6 jack (2) at carrier bulkhead.

Inspect plug and jack for corrosion and/or other

damage.

Are parts in good condition?

1.

2.

3.

Install front engine harness circuit 6 plug on main

harness circuit 6 jack at carrier bulkhead.

Inspect engine harness circuit 6 terminal end (1) on

starter (2).

Is terminal end free from corrosion and/or other

damage?

GO TO NEXT PAGE

1. Front main and/or engine

harness damaged.

2. Notify your supervisor.

3-27

1. Repair engine harness

 circuit 6 (page 14-3). 

2. Verify no faults found. 
TM 9-2350-261-20-1 

1. Remove eight nuts (1), washers (2), and screws (3)

from master switch panel (4). Pull panel away

from distribution box (5).

2. Inspect cable 49 (6) from master switch to

distribution box.

3. Are cable and cable ends free from corrosion and

damage?

YES

1. Inspect front main harness circuit 6 (1) lead on

distribution box bus bar (2).

2. Is lead terminal free from corrosion and damage?

1. Install master switch panel (9-16).

2. Replace starter assembly (page 10-2).

3. Verify no faults found.

1. Repair master power to

distribution box cable

(page 14-9).

2. Verify no faults found.

1. Repair front main harness

circuit 6 (page 14-3).

2. Verify no faults found.

3-28 
TM 9-2350-261-20-1 

1. Remove eight nuts (1), washers (2), and screws (3)

from master switch panel (4). Pull panel away

from distribution box (5).

2. Inspect terminal end(s) on master switch (6).

3. Are terminal end and master switch free from

corrosion and/or other damage?

1. Verify no faults found.

1. Repair battery to master

power cable and/or master

switch (page 14-9).

2. Verify no faults found.

3-29
TM 9-2350-261-20-1 

ENGINE CRANKS BUT WILL NOT STAR T

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Suitable container

Personnel Required:

Unit Mechanic

Helper (H)

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant access door open (see your -10)

Driver’s power plant access panel removed

(see your -10)

Power-plant rear access panels removed (see

your -10)

1. Inspect condition and operation of fuel cut off cable

assembly (page 23-44).

2. Is cable assembly in good condition and in proper

adjustment?

1. Check manual fuel shutoff valve (1) at fuel tank.

2. Is fuel shutoff valve on? (see your -10)

1. Replace and/or adjust fuel

cut off cable assembly

(page 23-44).

2. Verify no faults found.

1. Turn manual fuel shutoff

valve on (see your -10).

3-30
Chapter 6

page 6-123 and 6-125

TM 9-2350-261-25-1

3-31
TM 9-2350-261-20-1 

1. Remove engine fuel supply line (1) from bulkhead

fitting (2).

2. Manually depress plunger on bulkhead fitting (2)

quick disconnect coupling.

3. Does fuel flow from coupling?

YES

1. Inspect fuel lines between bulkhead fitting and primary filter.

2. Inspect fuel lines between primary filter and fuel

pump.

3. Inspect fuel lines between fuel pump and secondary

4. Inspect fuel lines between secondary filter and

engine.

5. Are all lines free of kinks and other damage?

1. Replace fuel pump (page 6-121).

2. Verify no faults found.

3-32

filter .

1. Replace engine fuel line(s)

 as required (Chapter 6). 

2. Verify no fualts found. 
TM 9-2350-261-20-1 

NOT E

There are additional fuel lines on the

M677A2 carrier. Make sure to inspect all

fuel lines.

1. Remove rear compartment floor plates

(page 24-37).

2. Inspect fuel lines between fuel tank(s) (1) and bulkhead fittings (2).

3. Are all lines and fittings free from leaks and

damage?

1. Clear clogged fuel pickup inside fuel tank(s)

(Chapter 6).

1. Repair/replace fuel line(s)

as required (Chapter 6).

2. Verify no faults found.

2. Verify no faults found.

3-33
TM 9-2350-261-20-1 

ENGINE CRANKS BUT WILL NOT START BELOW 40° (AIR BO X

HEATER IS USED )

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

Helper (H)

References:

See your -10

References (cont):

STE/ICE-R engine will crank but will not

start troubleshooting

Equipment Conditions:

(page 3-271)

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant access door open (see your -10)

Driver’s power plant access panel removed

(see your -10)

Power plant rear access panels removed

(see your -10)

1. Remove air pump to air box heater hose (1) from air

box (2).

2. Turn MASTER SWITCH to ON (see your -10).

3. Turn air box heater switch to ON.

4. Does airflow from end of hose?

3-34 Change 1

GO TO PAGE 3-38
TM 9-2350-261-20-l

1. Release air box heater switch.

2. Turn MASTER SWITCH to OFF (see your -10).

3. Install air pump to air box heater hose onto air box

heater (page 6-133).

4. Remove air box igniter high voltage wire (1) and

igniter (2).

5. Install high voltage wire (1) on igniter (2).

6. Ground hex portion of igniter (2) on idler pulley

pivot.

WARNING

High voltage. Keep hands

clear.

7. Turn MASTER SWITCH to ON (see your -10).

8. Turn air box heater switch to ON (see your -10).

9. Does igniter produce a spark?

GO TO NEXT PAGE

3-35
TM9-2350-261-20-1

1. Release air box heater switch.

2. Turn MASTER SWITCH to OFF.

3. Install air box igniter.

4. Install air box heater harness plug wire on igniter coil.

5. Remove solenoid to air box heater tube assembly (1).

6. Turn MASTER SWITCH to ON.

7. Turn air box heater switch to ON with engine cranking.

Do not allow engine to start. Have helper assist.

8. Does fuel fail to flow from solenoid with air box heater

1. Release air box heater switch.

2. Turn MASTER SWITCH to OFF.

3. Remove air box heater assembly (page 6-138).

4. Is igniter electrode and spray nozzle free of contamination and damage?

1. Air box heater is working

properly. Go to engine

cranks, but will not start

(page 3-30).

2. Verify no faults found.

1. Clean and/or replace air box

heater assembly

(page 6-138).

2. Verify no faults found.

3-3 6 Change 4
TM 9-2350-261-20-1

1. Release air box heater switch.

2. Turn MASTER SWITCH to OFF.

3. Remove fuel supply line to solenoid (1) at return tee (2).

4. Crank engine for 3-5 seconds.

5. Does fuel flow from return tee with engine cranking?

1. Install solenoid fuel supply

line on return tee.

2. Go to engine cranks, but will

not start (page 3-30)

1. Inspect fuel supply line to solenoid. 1. Clear or replace air box fuel

2. Is line free from kinks or clogs? supply line (page 6-118).

2. Verify no faults found.

YES

1. Install solenoid fuel supply line on return tee.

2. Remove air box heater harness plug (1) from

solenoid (2).

3. Measure voltagebetween plug (1) sockets A (+) and B

(-) with air box heater switch on.

4. Does multimeter read less than 17 volts?

Change 4 3-37
TM 9-2350-261-20-l

1. Install solenoid to air box heater fuel line.

2. Install air box heater harness plug on to fuel solenoid.

GO TO PAGE 3-42

1. Release air box heater switch.

2. Turn MASTERSWITCH to OFF.

3. Remove air hose (1) from air pump (2).

4. Is hose free from restriction and damage?

1. Replace air pump to air box

heater hose (page 6-133).

2. Verify no faults found.

3-38 Change 4
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to ON.

2. Listen to air pump with air box heater switch ON.

3. Is air pump silent?

1. Measure voltage between power lead terminals 1 (+)

and 2 (-) on air pump (3) with air box switch depressed.

2. Turn MASTER SWITCH to OFF.

3. Did multimeter read less then 17 volts?

1. Ins tall air pump to air box heater hose onto air box

heater (page 6-133).

GO TO PAGE 3-42

1. Turn MASTER SWITCH to

OFF.

2. Replace air pump vane set

(page 6-135).

1. Install air pump to air box

heater hose onto air box

heater (page 6-133).

2. Replace air pump

(page 6-133) .

3. Verify no faults found.

Change 4 3-39
TM 9-2350-261-20-1

1. Release air box heater switch.

2. Install air box heater assembly. 1. Replace igniter wire.

3. Disconnect ends of ignition wire (1) from coil (2) and air 2. Verify no faults found.

box heater (3).

4. Measure resistancebetween wire ends (2) and (3).

5. Is ignition wire in good condition and measure 0 ohms?

3-40 Change 4
TM 9-2350-261-20-1 

1. Install ignition wire on igniter.

2. Remove air box heater harness plug (1) from

ignition coil (2).

3. Turn MASTER SWITCH to ON.

4. Turn air box heater switch ON.

5. Measure voltage between air box heater harness

plug sockets A (+) and B (-).

6. Does multimeter read less than 17 volts?

1. Release air box heater switch.

2. Turn MASTER SWITCH to OFF.

3. InstalI ignition wire on coil.

GO TO NEXT PAGE

1. Replace ignition coil

(page 6-132).

2. Verify no faults found.

3-41
TM 9-2350-261-20-1 

1.

2.

3.

4.

5.

Remove engine harness plug (1) from air box

heater harness jack (2).

Turn MASTER SWITCH to ON.

Measure voltage between engine harness plug (1)

pin A (3) to ground (4) and pin B (5) to ground (4)

with air box heater switch depressed.

Turn MASTER SWITCH to OFF.

Did multimeter read less than 17 volts for both

readings?

1. Remove engine harness plug (1) from front main

harness jack (2) at earner bulkhead.

2. Turn MASTER SWITCH to ON.

3. Measure voltage from front main harness jack (2)

pin C (3) and ground with air box heater switch

4. Turn MASTER SWITCH to OFF.

5. Did multimeter read less than 17 volts? 

1. Replace air box heater wiring harness (page 6-140).

2. Verify no faults found.

1. Faulty engine harness.

2. Notify your supervisor.

3-42
TM 9-2350-261-20-1 

Remove air box heater switch (page 11-7).

Remove circuits 406 (1) and 27C (2) plugs from air

box heater switch jacks (3) and (4).

Measure resistance between switch jack (3) and (4

with air box heater ON.

Does multimeter read 0 ohms?

1.

2.

3.

4.

Remove circuit 27 plug (1) from instrument panel

circuit breaker (2).

Measure resistance between instrument panel

wiring harness circuit 27 (1) and 27C (3) plug

pins.

Does multimeter read 0 ohms?

1.

2.

3.

1. Replace air box heater

switch (page 11-7).

2. Verify no faults found.

1. Repair front main harness circuit 406 (page 14-3).

2. Verify no faults found.

1. Repair instrument panel

wiring harness circuit

27C/27 (page 14-3).

2. Verify no fault found.

3-43
TM 9-2350-261-20-1 

ENGINE RUNS ROUGH, STALLS, OR DOES NOT PUT OUT FUL L

POWE R

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

STE/ICE-R Test Set (Item 71.1, App D)

Materials/Parts:

Suitable container

Wiping rag

Personnel Required:

Unit Mechanic

Helper (H)

References:

See your -10

References (cont):

See your LO

STE/ICE-R Test 14 (page 3-287)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Air cleaner element cleaned (see your -10)

Primary and secondary fuel filters serviced

(see your -10)

Trim vane lowered (see your -10)

Power plant access door

Power plant rear access

(see your -10)

Rear compartment floor

(page 24-37)

open (see your -10)

panels removed

plates removed

1. Ensure manual shutoff valve is open (see your -10).

2. Push forward on quick disconnect coupling (1) to disconnect return hose (2) from fuel return line (3).

CAUTION

Keep return hose clear of generator

drive belts.

3. Pull return hose (2) with quick disconnect coupling (1)

out of power plant compartment. Remove half of quick

disconnect coupling (1) from return hose (2), and retain.

3-44 Change 1
TM 9-2350-261-20-1 

3. Insert hose into metal container (1) with at least 1

gallon (4 liter) capacity.

WARNIN G

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

4. Make sure container (1) is making metal-to-metal

contact with earner floor so there is a good ground.

WARNIN G

Loose clothing is dangerous

around moving belts and

pulley. You could get badly

hurt if your clothes get

caught in moving parts.

5. Start engine (see your -10). Run engine at 1200

RPM for 1 minute. Hold end of fuel return hose in

fuel.

6. Install rear half of quick disconnect on hose.

7. Place fuel return hose inside power plant

compartment and connect hose to return line. Make

sure quick disconnect snaps firmly in place.

8. Did fuel flow at least 1/2 gallon (2 liter) per

minute?

GO TO NEXT PAGE

3-45

GO TO PAGE 3-49
TM 9-2350-261-20-1 

1. Inspect fuel cut off control cable assembly (1) and

fuel control arm (2).

2. Are fuel cut off control cable assembly and fuel

control arm parts in good condition and working

properly?

1. Inspect governor throttle linkage (1) for bent, loose,

broken or missing parts.

2. Are governor throttle linkage parts in good condition and working properly?

3-46

1. Adjust/replace fuel cutoff

cable (page 23-44).

 2. Verify no faults found.

1. Repair/replace governor

throttle linkage

(page 23-31 and 23-33).

2. Verify no faults found.
TM 9-2350-261-20-1 

1. Inspect accelerator linkage for bent, loose, broken or

missing parts.

2. With pedal (1) in full throttle position, travel spring

(2) should be compressed so that a gap of 1/64 to

3/64 inch (0.4 to 1.0 mm) exists between pivot pin

(3) and rod stop (4).

3. Are accelerator linkage parts in good condition, cor1. Remove air cleaner element (see your -10).

2. Remove air cleaner hose (page 7-3).

3. Inspect air cleaner hose (l), engine intake (2), and

air cleaner cover (3) for signs of obstruction or

collapse.

4. Are air cleaner hose, engine intake, and air cleaner

1. Repair/adjust accelerator

linkage parts (page 23-27).

2. Verify no faults found.

1. Remove any obstructions.

2. Replace unserviceable air

cleaner hose (page 7-3) or

air cleaner cover

(page 7-5).

3. Verify no faults found.

GO TO NEXT PAGE 3-47

rectly adjusted, and working properly? 

cover serviceable?
TM 9-2350-261-20-1 

1.

2.

3.

4.

5.

Install air cleaner hose (page 7-3).

Remove five screws (1), washers (2), plate (3), and

two spacers (4) from drivers compartment bulkhead.

Ensure that air control valve handle is pushed in

(see your -10).

Inspect air control valve baffle (5) for operation.

Are air control valve parts in good condition and

operating properly?

1. Engine does not produce full power.

2. Install plate on drivers compartment bulkhead.

3. Notify your supervisor.

1. Repair air control valve

(page 7-11).

2. Report problem to

supervisor.

3-48
TM 9-2350-261-20-1

1. Does fuel with no air bubbles come out of return fuel

1. Replace primary and secondary fuel filter elements

(page 6-128).

2. Verify no faults

Have primary and secondary fuel filter elements been

replaced?

1. Pull fuel supply hose (1) from quick disconnect coupling

(2) in power plant compartment.

2. Place wiping rags under fuel supply hose quick disconnect coupling (2).

3. Depress plunger inside quick disconnect coupling (2) for

about 5 seconds.

4. Connect fuel supply hose (1) to quick disconnect coupling (2).

5. Did fuel flow freely from fuel supply hose?

1. Replace engine fuel pump (page 6-121).

2. Verify no faults found.

1. Air leak in suction side of

fuel system.

2. Tighten all connections on

valves, fuel hoses, filter and

pump from fuel tank to fuel

3. Replace damaged hoses

and/or fittings (Chapter 6).

4. Verify no faults found.

1. Fuel supply hose or fuel tank

pick-up tube obstructed.

2. Go to fuel system maintenance (Chapter 6).

3. Verify no faults found.

Change 4 3-49
TM 9-2350-261-20-1

ENGINE OIL LOW PRESSURE INDICATOR FAILS TO GO OFF

AFTER ENGINE STARTS

INITIAL SETUP

Tools:

General Mechanic6 Tool Kit (Item 30, App D)

Oil Pressure Gage Kit (Item 28, App D)

STE/ICE-R Test Kit (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

See your LO

References (cont):

STE/ICE-R oil pressure troubleshooting

(page 3-264)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Engine warm

Engine oil level checked (see your -12)

Engine idle speed checked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

1. Remove engine oil low pressure switch (page 15-2).

2. Install adapter (1) and pressure tester (2).

3. Start engine and let idle (see your -10).

4. Does pressure tester read less than 13 psi?

1. Low engine oil pressure.

2. Notify your supervisor.

1. Go to engine oil low pressure

indicator malfunctions

(page 3-148).

3-50 Change 1
TM 9-2350-261-20-1 

ENGINE DOES NOT REMAIN AT IDLE RPM WITH SUSPENSIO N

LOCKOUT SYSTEM ENGAGED (M741A1 ONLY)

INITIAL SETUP 

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

References (cont):

TM 9-2350-300-10

Equipment Conditions:

Engine stopped/shutdown (see you -10)

Carrier blocked (see your -10)

1. Verify no faults found.

1. Go to: Suspension Lockout

Indicator Light Malfunctions (M741A1 Only)

(page 3-164).

2. Verify no faults found.

1. Replace suspension lockout

solenoid (page 26-76).

2. Verify no faults found.

3-51

1. Start engine. (See your -10).

2. Engage suspension lockout. (See

 TM 9-2350-300-10). 

3. Does SUSPENSION LOCKOUT indicator light (1)

 come on?

1. Check engine rpm.

2. Does engine rpm read bbetween 650 and 700 rpm?
TM 9-2350-261-20-1 

ENGINE FUEL SYSTEM SCHEMATI C

3-52
3-53 
TM 9-2350-261-20-1

AIR BOX HEATER SYSTEM SCHEMATIC

3-54 
TM 9-2350-261-20-l

CHARGING SYSTEM MALFUNCTIONS

INITIAL SETUP

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Inspection Mirror (Item 42, App D)

Digital Multimeter (Item 43, App D)

Jumper Wire

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

STE/ICE-R charging circuit troubleshooting

(page 3-256)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Driver’s power plant access panel removed

(see your -10)

Power plant rear access panels removed

(see your -10)

Engine disconnect lever IN (see your -10)

1. Start engine and run at 1200 RPM (see your -10).

2. Remove cap (1) from slave receptacle (2).

3. Measure voltage between contacts (+) (3) and (-) (4) on

auxiliary power receptacle.

4. Does multimeter read less than 26 or more than 29

volts?

1. Stop engine (see your -10).

2. Go to battery/generator

indicator malfunctions

(page 3-143).

1. Belt needs adjustment

1. Is generator belt tight or in good condition? or replacement

100 amp (page 9-31).

YES

200 amp (page 9-34).

1. Has regulator been adjusted?

1. Adjust regulator when all

other troubleshootingis complete. (page 9-38).

2. Verify no faults found.

GO TO PAGE 3-6 1

GO TO NEXT PAGE Change 4 3-55
TM 9-2350-261-20-1

1. Stop engine (see your -10).

2. Remove engine harness plug C8 (1) from generator jack

(2) and engine harness plug C3 (3) from front main

harness bulkhead jack (4).

3. Inspect engine harness plugs C8 (l), C3 (3) and

generator jack (2) and bulkhead jack (4) for corrosion

and damage. Use mirror.

4. Are plugs and jacks clean and in good condition?

1. Measure resistance between engine harness plug

C8 (1) and plug C3 (2), sockets D (3) to pins B (4), C (5)

to C (6), B (7) to D (8), and E (9) to E (10).

2. Does multimeter read 0 ohms each time?

1. Repair/replace engine

harness and/or generator

(page 14-3 or 9-31).

2. Verify no faults found.

1. Repair/replace engine

harness (page 14-3).

2. Verily no faults found. I

3-56 Change 4
TM 9-2350-261-20-1

1. Install engine harness plug C8 on generator jack.

2. Remove engine wiring harness plug C3 (1) from

bulkhead jack (2) and plug C4 (3) from regulator jack

C4 (4).

3. Inspect engine harness plug C3 (1), bulkhead jack (2),

front main plug C4 (3) and regulator jack C4 (4) for

corrosion and damage.

4. Is plug and jack in clean and good condition?

1. Repair/replace front main

wiring harness and/or

regulator (pages 14-3

and 9-40).

2. Verify no faults found.

1. Measure resistance between front main harness

bulkhead jack (1) and front main plug C4 (2), sockets B

(3) to pins B (4), C (5) to C (6), D (7) to D (8), and E (9)

to E (10).

2. Does multimeter read 0 ohms each time?

GO TO NEXT PAGE

1. Repair/Replace Front Main

Harness (page 14-3).

2. Verify no faults found.

Change 4 3-57
TM 9-2350-261-20-1

NOTE

1. Replace regulator

(page 9-40).

If regulator is a 200 amp, reattach 2. Verify no faults found.

ground wire.

1. Install engine wiring harness plug C3 on front main

harness bulkhead jack.

2. Remove front main harness plug C5 (1) from

regulator (2).

3. Remove four screws (3) and regulator (2) from regulator plate (4).

4. Measure resistance between regulator jacks (5 and 6),

socket C (7) to pin A (8), and socket D (9) to pin C (10).

5. Does multimeter read 0 ohmsbetween socket D (9) and

pin C (10), and infinity ohms between socket C (7) and

pin A (8)?

1. Measure voltage between front main wiring harness

plug C5 (1), socket A (+) (2), and socket C (-) (3). (If

your carrier is equipped with a 200 amp generator

system, measure voltage between socket A and ground,

then between pin C and ground).

2. Turn on Master Switch.

3. Does multimeter read more than 17 volts?

GO TO PAGE 3-62

3-58 Change 4
TM 9-2350-261-20-1

1. Start engine and let idle (see your -10).

2. Measure voltage between front main harness plug C5

(1), socket F (2), leave in ground.

3. Does multimeter read less than 17 volts?

GO TO NEXT PAGE

1. Stop engine (see your -10).

2. Replace generator and regulator assemblies (page 9-31

or 9-34 and 9-40).

3. Verify no faults found.

Change 4 3-59
TM 9-2350-261-20-1

1. Stop engine (see your -10).

2. Install regulator on regulator plate.

3. Install front main wiring harness plug C4 on regulator.

4. Remove engine harness plug (1) from generator field

switch jack (2).

5. Install jumper (3) on engine harness plug (1) between

pins NO (4) and C (5).

6. Turn MASTER SWITCH to ON.

7. Measure voltage between front main wiring harness

plug C5 (6), socket F (7), and ground.

8. Does multimeter read less than 17 volts?

1. Turn MASTER SWITCH to OFF.

2. Remove engine wiring harness plug C7 (1) from front

main wiring harness bulkhead jack C7 (2).

3. Measure resistancebetween C7 plug (1), pins B (3),

and F (4).

4. Does multimeter read 0 ohms?

1. Replace generator field

switch (page 9-44).

2. Verity no faults found.

1. Remove jumper wire from

generator field switch plug.

2. Measure resistancebetween

plug C7, pin B, and engine

harness plug pin NO. If

multimeter reads 0 ohms,

see step 4.

3. Measure resistance between

plug C7, pin F, and engine

harness plug pin C. If

multimeter reads 0 ohms,

see step 4.

4. Repair engine wiring harness

circuit 1A or 1B (page 14-3).

5. Verify no faults found.

3-60 Change 4
TM 9-2350-261-20-1

1. Remove jumper wire from engine harness plug.

2. Install engine wiring harness on generator field switch.

3. Turn MASTER SWITCH to ON.

4. Measure voltage between front main harness bulkhead

jack C7 (1) pin F (2) to ground.

5. Turn MASTER SWITCH to OFF.

6. Did multimeter read more than 17 volts?

1. Repair front main wiring harness circuit 1B

(page 14-3).

2. Verify no faults found.

1. Engine stopped/shutdown (see your -10).

2. Measure resistancebetween regulator housing (1) and

ground.

3. Does multimeter read 0 ohms?

1. Install front main harness

plug C5 on regulator jack.

2. Repair front main wiring

harness circuit 1A

(page 14-3).

3. Verify no faults found.

1. Remove regulator

(page 9-40) and clean

ground contacts

(bolted surface).

2. Install regulator.

3. Verify no faults found.

GO TO NEXT PAGE Change 4 3-61
TM 9-2350-261-20-1

1. Has regulator been replaced? 1. Replace regulator

(page 9-40).

2. Verify no faults found.

1. Replace generator (page 9-31 or 9-34).

2. Verify no faults found.

1. Does your carrier have a 100 amp charging system?

1. Install regulator on regulator plate.

2. Removeeight nuts (1), washers (2), and screws (3)

from master switch panel (4). Pull panel away from

distribution box (5).

3. Measure resistancebetween front main harness circuit

3 terminal (6) on circuit breaker (7) and ground.

4. Does multimeter read 0 ohms?

1. Replace generator-regulator

circuit breaker (page 9-42).

2. Verify no faults found.

1. Repair front main wiring harness circuit 2 or 3

(page 14-3).

2. Verify no faults found.

3-62 Change 1
TM 9-2350-261-20-1 

1. Install plug C4 to regulator jack. NO 1. Front main wiring harness

2. Is this earner a M741A1? circuit 2 or 2A for 200

amp systems damaged.

2. Notify your supervisor. YES

1.

2.

3.

4.

Remove six nuts (1), washers (2), screws (3), cover

(4), and gasket (5) from turret distribution box (6).

Turn MASTER SWITCH to ON.

Measure voltage in turret distribution box (6)

circuit 2A (7) to ground.

Does multimeter read more than 18 volts?

NO 1. Turn MASTER SWITCH

to OFF.

I

2. Repair circuit 2A

(page 14-3).

3. Verify no faults found.

GO TO NEXT PAGE

 3-63 
TM9-2350-261-20-1

1. Measure voltage in turret distribution box (1)

circuit 2 (2) to ground.

2. Turn MASTER SWITCH to OFF.

3. Did multimeter read more than 17 volts?

I

1. Repair front main wiring harness (page 14-3).

2. Verify no faults found. I

NO 1. Replace all damaged diode

semiconductor device

assemblies and wire wound

fixed resistors in turret

distribution box

(page 17-25).

2. Verify no faults found.

3-64
TM 9-2350-261-20-1

DISCONNECT/CONNECT ALTERNATOR (GENERATOR) TEST KI T

INITIAL SETUP 

Tools: Equipment Conditions: 

General Mechanic’s Tool Kit (Item 30, App D) Engine stopped (see your -10)

Alternator Test Kit (Item 74.1, App D) Ramp lowered (see your -10)

Electrical Connector Pliers (Item 44, App D) All radio and heaters turned off

(see your -10)

Personnel Required: Battery box cover removed (page 13-3)

Unit Mechanic Battery drawer open (page 13-24)

References:

See your -10

CONNECT

3.

1. Disconnect batteries (page 13-2).

2. Check all electrical connectors, cannon plugs, 4.

and wiring harnesses

alternator test kit.

before connecting

Remove two front main wiring harness cannon plugs (1,2) from voltage regulator (3).

Use electrical connector pliers.

Connect two cannon plugs (4,5) of diagnostic

test wiring harness (6) to cannon plugs (1,2).

.

Use

—

electrical connector pliers.

GO TO NEXT PAGE

Change 1 3-64.1
TM 9-2350-261-20-1

Connect lead 2 (1) of diagnostic test wiring

harness (2) to terminal 5 (3) of alternator

test kit (4).

CAUTIO N

If ground lead (5) is not connected to

chassis and test kit, the alternator could

be damaged when engine is started.

Connect ground lead (5) to terminal 6 (6) of

alternator test kit (4) and ground.

a. Remove screw (7), lock washer (8), and

ground lead (9) from voltage regulator

mounting plate (10).

b. Secure ground lead (5) and ground lead

(9) to mounting plate (10) with lock

washer (8) and screw (7).

Connect batteries (page 13-2).

3-64.2 Change 1

5. 

6. 

 7. 
TM 9-2350-261-20-1

DISCONNECT

8.

9.

10.

11.

12.

13.

Disconnect batteries (page 13-2).

Disconnect ground lead (1) from terminal 6

(2)

a.

b.

of alternator test kit (3) and ground.

Remove screw (4), lock washer (5), and

ground leads (1,6) from voltage regulator

mounting plate (7).

(7) with lock washer

Disconnect lead 2 (8) of

wiring harness (9) from

alternator test kit (3).

Secure ground lead (6) to mounting plate

(5) and screw (4).

diagnostic test

terminal 5 (10) of

Disconnect two cannon plugs (11,12) of diagnostic test wiring harness (9) from two cannon plugs (13 ,14) of front main wiring

harness (15). Use electrical connector pliers.

Connect two cannon plugs (13 ,14) of front

main wiring harness (15) to voltage

regulator (16). Use electrical connector

Connect batteries (page 13-2).

END OF TASK

Change 1 3-64.3
TM 9-2350-261-20-1 

200 AMP CHARGING SYSTEM OPERATIONAL CHEC K

INITIAL SETUP

Tools : References:

General Mechanic’s Tool Kit (Item 30, App D) See your-10

Multimeter (Item 43, App D) TM 9-6140-200-14

Personnel Required: Equipment Conditions:

Unit Mechanic Engine stopped (see your -10)

Carrier blocked (see your-10)

1. Turn MASTER SWITCH ON.

2. Measure battery voltage by placing red lead (1) in positive socket of nato plug (2) on auxiliary power (slave)

receptacle (3). Touch negative lead (4) to outside of nato

plug on receptacle.

NOTE

On carriers that have standard auxiliary

power receptacles, touch red lead to

positive and black lead to negative

sockets in the receptacle.

3. Is battery voltage more than 24.8 volts?

NO 1. Replace or charge batteries

(TM 9-6140-200-14).

2. Verify no faults found.

I

1. Start engine and run at fast idle (800 rpm) with no I

NO

.

1. Go to no charge/regulation

troubleshooting 2. Is voltage higher than battery voltage? (page 3-64.7).

2. Verify no faults found.

3-64.4 Change 1

electrical equipment/load. 
TM 9-2350-261-20-1 

1. Is voltage 27.5 or higher? NO

/

CAUTION

If voltage is 35 or more volts, shut off

engine. Alternator could be damaged.

1. Raise engine speed slowly.

2. Is voltage between 27.5 and 28.5 volts?

YES

1. Run engine at 900 rpm and turn on electrical

equipment (lights and radio).

2. Does voltage vary less than ± 0.5 volts?

1. No faults found.

.

1. Adjust voltage regulator setting (page 9-38).

2. Start engine and run at fast idle (800 rpm) with no

electrical equipment/load.

3. Is voltage higher than battery voltage?

NO

NO

NEXT PAGE

1. Go to no charge/regulation

troubleshooting

(page 3-64.7).

2. Verify no faults found.

1. Go to no charge/regulation

troubleshooting

(page 3-64.7).

2. Verify no faults found.

 1. No faults found.

Change 1 3-64.5

GO T O
TM 9-2350-261-20-1

.

1. Raise engine speed slowly. NO 1. Replace voltage regulator

2. Is voltage below 34 volts? (page 9-40).

2. Verify no faults found.

I

1. Does voltage climb to 32 to 34 volts and immediately

drop to battery voltage?

I

1. Go to over voltage troubleshooting (page 3-64.11).

2. Verify no faults found.

1. Does voltage climb above 28.5 volts but below 33 volts NO 1. Go to over voltage troubleand remain constant? shooting (page 3-64. 11).

2. Verify no faults found.

I

1. Go to full field charge troubleshooting (page 3-64.9).

2. Verify no faults found. I

3-64.6 Change 1
TM 9-2350-261-20-1 

200 AMP NO CHARGE/REGULATION TROUBLESHOOTIN G

INITIAL SETUP 

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Multimeter (Item 43, App D)

Electrical Connector Pliers (Item 44, App D)

Alternator Test Kit (Item 74.1, App D)

Personnel Required: 

Unit Mechanic

References:

See your -10

TM 9-6140-200-14

Equipment Conditions: 

Engine stopped (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

All radios and heaters OFF (see your -10)

Battery box cover removed (page 13-3) or

battery drawer open (page 13-23)

1. Disconnect batteries (page 13-2).

2. Check all electrical connectors, harnesses, and cannon

plugs before connecting alternator test kit.

3. Are connectors and cannon plugs tight and pins in place

in harnesses?

1. Tighten or repair connections, cannon plugs, and

harnesses. Use electrical

connector pliers.

2. Repeat charging system

operational check

(page 3-64.4). YES I

1. Check generator drive belt. NO 1. Adjust generator

2. Is belt tight and in good condition? (page 9-34) or replace drive

belt (page 9-47).

1. Connect alternator test kit (page 3-64.1).

2. Measure battery voltage using multimeter.

3. Start engine and check generator field switch circuit

(lead 1 to ground).

4. Is battery voltage present?

1. Repair generator field switch

circuit (page 9-44).

2. Repeat charging system operational check

(page 3-64.4).

GO TO NEXT PAGE

Change 1 3-64.7

operational check 

(page 3-64.4). 

2. Repeat charging system 
TM 9-2350-261-20-1 

1. Check batteries to make sure they are fully charged

(TM 9-6140-200–14).

2. Turn off all electrical equipment/loads.

CAUTION

If voltage climbs above 33 or more volts,

shut off engine. Alternator could be

damaged.

3. Adjust rheostat to maximum resistance.

4. Connect diagnostic test harness leads 1 and 4 together.

5. Start engine and run at 800 rpm and lower resistance.

6. Does voltage rise above battery voltage (test harness

lead 3 to ground) to approximately 28 volts?

1. Remove alternator test kit (page 3-64.1).

2. Replace voltage regulator (200 amp generator)

(page 9-40).

3. Repeat charging system operational check

(page 3-64.4).

1. Remove alternator test kit

(page 3-64.1).

2. Replace generator (200 amp)

(page 9-34).

3. Repeat charging system

operational check

(page 3-64.4).

3-64.8 Change 1
TM 9-2350-261-20-1

200 AMP FULL FIELD CHARGE TROUBLESHOOTIN G

INITIAL SETUP 

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Multimeter (Item 43, App D)

Electrical Connector Pliers (Item 44, App D)

Alternator Test Kit (Item 74.1, App D)

Personnel Required: 

Unit Mechanic

References:

See your -10

Equipment Conditions: 

Engine stopped (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

All radios and heaters OFF (see your -10)

Battery box cover removed (page 13-3) or

battery drawer open (page 13-24)

1. Disconnect batteries (page 13-2). NO

2. Check all electrical connectors. harnesses. and cannon

plugs before connecting alternator test kit.

3. Are connectors and cannon plugs tight and pins in place

in harnesses? I

1. Remove six screws (1) and cover (2) from voltage

regulator (3).

2. Connect multimeter to clean unpainted surface and

vehicle ground.

3. Does multimeter read 0.5 ohms or less?

1. Tighten or repair connections, cannon plugs, and

harnesses. Use electrical

connector pliers.

2. Repeat charging system

operational check

(page 3-64.4).

1. Ensure lock washers (4) and

screws (5) are tight on

plate (6).

2. Tighten nut (7) securing

ground lead (8) to

regulator (3).

3. Install cover and screws on

voltage regulator.

4. Repeat charging system

operational check

(page 3-64.4).

GO TO NEXT PAGE

Change 1 3-64.9
TM 9-2350-261-20-1 

1. Install cover and six screws on voltage regulator.

2. Connect alternator test kit (page 3-64.1).

3. Check capacitors from field to ground (test harness lead

2 to ground) with multimeter.

4. Does multimeter read between 100,000 ohms and

infinity?

1. Check capacitors from field to positive (test harness

lead 3 to 4) with multimeter.

2. Does multimeter read between 100,000 ohms and

infinity?

1. Remove alternator test kit (page 3-64.1).

2. Replace voltage regulator (page 9-40).

3. Repeat charging system operational check

(page 3-64.4).

1.

2.

Replace generator

(page 9-34).

Repeat charging system

operational check -

(page 3-64.4).

1. Replace generator

(page 9-34).

2. Repeat charging system

operational check

(page 3-64.4).

3-64.10 Change 1
TM 9-2350-261-20-1 

200 AMP OVER VOLTAGE TROUBLESHOOTIN G

INITIAL SETUP 

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Multimeter (Item 43, App D) TM 9-6140-200-14

Electrical Connector Pliers (Item 44, App D)

AlternatorTest Kit (Item 74.1, App D) Equipment Conditions: 

Engine stopped (see your -10)

Personnel Required: Carrier blocked (see your -10)

Unit Mechanic

1. Turn MASTER SWITCH ON.

2. Measure battery voltage by placing red lead (1) in positive socket of NATO plug (2) on auxiliary power (slave)

receptacle (3). Touch black negative lead (4) to outside

of NATO plug on receptacle.

NOTE

On earners that have standard auxiliary

power receptacles, touch red lead to

positive and black lead to negative

sockets in the receptacle.

3. Adjust voltage regulator (200 amp) to lowest setting

(page 9-38).

4. Start engine and accelerate.

5. Does voltage climb to 32 to 34 volts and suddenly drop

to battery voltage?

 GO TO PAGE 344.13 

Change 1 3-64.11
TM 9-2350-261-20-1 

1.

2.

3.

Remove six screws (1) and cover (2) from voltage

regulator (3).

Connect multimeter to clean unpainted surface and

vehicle ground.

Does multimeter read 0.5 ohms or less?

1. Install cover and six screws on voltage regulator.

2. Connect alternator test kit (page 3-64.1).

3. Check batteries to make sure they are fully charged

(see TM 9-6140-200-14).

4. Turn off all electrical equipment/loads.

CAUTION

If voltage climbs above 33 or more volts,

shut off engine. Alternator could be

damaged.

5. Adjust rheostat to maximum resistance.

6. Connect diagnostic test harness leads 1 and 4 together.

7. Start engine and run at 800 rpm and lower resistance.

8. Does voltage rise above battery voltage (test harness

lead 3 to ground) to approximately 28 volts?

1.

2.

Ensure lock washers (4) and

screws (5) are tight on

plate (6).

Tighten nut (7) securing

ground lead (8) to -

regulator (3).

3. Install cover and screws on

voltage regulator.

4. Repeat charging system

operational check

(page 3-64.4).

1. Remove alternator test kit

(page 3-64.1).

2. Replace generator (200 amp)

(page 9-34).

3. Repeat charging system

operational check

(page 3-64.4).

3-64.12 Change 1
TM 9-2350-261-20-1 

1. Remove alternator test kit (page 3-64.1).

2. Replace voltage regulator (200 amp) (page 9-40).

3. Repeat charging system operational check

(page 3-64.4).

1. Adjust voltage regulator to 27.9 to 28.1 volts

(page 9-38).

2. Repeat charging system operational check

(page 3-64.4).

3. After slowly raising engine rpms in charge system

operational check, does voltage climb to 32 to 34 volts

and suddenly drop to battery voltage?

GO TO PAGE 3-64.12

1. Verify no faults found.

Change 1 3-64.13 (3-64.14 blank)

TM 9-2350-261-20-1 

100 AMP ENGINE CHARGING SYSTEM SCHEMATIC

 3-65 
TM 9-2350-261-20-1

200 AMP ENGINE CHARGING SYSTEM SCHEMATIC

3-66
TM 9-2350-261-20-1

200 AMP ENGINE CHARGING SYSTEM SCHEMATIC (M981 ONLY)

3-67
TM 9-2350-261-20-1 

DIFFERENTIAL HI OIL TEMP INDICATOR COMES O N

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required: 

Unit Mechanic

Helper (H)

Equipment Conditions: 

Engine stopped/shutdown see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see vour -10)

Power plant access door open (see your -10)

Differential cold

Reference:

see your -10

1.

2.

3.

CAUTIO N

Do not operate carrier with differential

HI OIL TEMP indicator on.

damage may result.

Disconnect engine harness circuit 328

differential hi oil temp switch (2).

Turn MASTER SWITCH ON.

Serious

(1) from

Is differential HI OIL TEMP indicator off?

NO 1. Go to differential OIL HI

TEMP indicator

malfunctions (page 3-159).

4

 3-68 
TM 9-2350-261-20-1 

1. Turn MASTER SWITCH OFF.

2. Measure resistance between connector pin (1) and

ground (2) of differential high oil temp switch.

3. Does multimeter read more than 5 ohms?

YES

1. Connect engine harness circuit 328 plug to

differential HI OIL TEMP switch.

2. Inspect differential oil cooler hoses (1) for blockage

and/or damage.

3. Are differential oil cooler hoses free from blockage

and/or damage?

1. Replace differential high oil

temp switch (page 15-4).

2. Verify no faults found. I

1. Clear blockage or replace

differential oil cooler hoses

( page 21-14).

I

GO TO NEXT PAGE

 3-69 

2. Verify no faults found. 
TM 2350-261-20-1 

1. Check differential oil pump for leaks from hoses

and housing. Does it appear to be in good working

order?

1. Tighten elbows or replace

packing (page 21-2).

2. Replace differential oil

pump (page 21-2).

3. Verify no faults found.

1. Has differential oil falter been replaced? 1. Replace differential oil filter

(page 21-6).

YES

2. Verify no faults found.

1. Suspected faulty oil cooler.

2. Notify your supervisor.

3-70
TM 9-2350-261-20-1

TRANSMISSION OIL HI TEMP INDICATOR COMES O N

INITIAL SETUP 

Tools: Equipment Conditions: 

General Mechanics Tool Kit (Item 30, App D) Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Personal Required: Trim vane lowered (see your -10)

Unit Mechanic Power plant access door open (see your -10)

Helper (H)

Reference:

see your -10

CAUTIO N

Do not operate carrier with TRANS OIL

HI TEMP indicator on. Serious damage

may result.

1. Disconnect engine harness circuit 327 (1) from

transmission oil hi temp switch (2).

2. Turn MASTER SWITCH ON.

3. Is TRANS OIL HI TEMP indicator off?

1. Turn MASTER SWITCH

OFF.

2. Go to TRANS OIL HI

TEMP indicator

malfunctions (page 3-159).

GO TO NEXT PAGE

3-71
TM 9-2350-261-20-1 

1. Turn MASTER SWITCH OFF.

2. Inspect transmission oil cooler hoses (1) for blockage and/or damage.

3. Are transmission oil cooler hoses free from blockage

and serviceable?

YES

1. Connect engine harness circuit 327 plug to

transmission oil hi temp switch.

2. Has transmission oil filter been replaced?

1. Clear blockage or replace

transmission oil cooler

hoses (page 18-2).

2. Verify no faults found. I

1. Replace transmission oil

falter (page 18-8).

2. Verify no faults found. I

I

1. Suspected faulty oil cooler/oil pump.

2. Notify your supervisor. I

3-72
NO EXTERIOR LIGHTS OPERAT E

INITIAL SETUP 

Tools:

General Mechanics

Digital Multimeter

Tool Kit (Item

(Item 43, App

Personnel Required: 

Unit Mechanic

References:

30, App D) see your -10

D)

Equipment Conditions: 

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Remove instrument panel for access. See task:

replace instrument panel mounts and ground lead

(page 11-2).

2. Remove front main harness plug (1) from lighting

control switch jack (2).

3. Remove front main harness circuit 15 plug (3) from

master power harness circuit 15 jack (4).

4. Measure resistance between front main harness

circuit 15 plug (3) and lighting control switch plug

(1) pin F (5).

5. Does multimeter read 0 ohms?

GO TO NEXT PAGE

1. Repair front main harness

circuit 15 (page 14-3).

2. Verify no faults found. I

3-73

TM9-2350-261-20-1 
TM 9-2350-261-20-1 

1. Remove master power harness circuit 10 plug (1)

from instrument panel circuit breaker (2).

2. Measure resistance between master power harness

circuit 15 plug (3) and circuit 10 plug (l).

3. Does multimeter read 0 ohms?

1. Install master power harness circuit 10 and 15

plugs.

2. Replace lighting control switch (page 11-9).

3. Verify no faults found.

1. Install front main harness

lighting control switch plug

on switch.

2. Repair master power

harness (page 14-3).

3. Verify no faults found.

3-74
TM 9-2350-261-20-1 

BLACKOUT DRIVE LIGHT DOES NOT WOR K

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D)

Equipment Conditions: 

Personnel Required: Engine stopped/shutdown (see your -10)

Unit Mechanic Carrier blocked (see your -10)

Helper (H) IR/BO selector on BO (see your -10)

1. Operate exterior lights in all positions 1. Go to no exterior lights

(see your -10). operate (page 3-73).

2. Do any exterior lights operate in any lighting

control switch positions?

1. Remove front main harness plug (1) from BO

DRIVE light jack (2).

2. Measure resistance between BO DRIVE light

jack (2) and ground.

3. Does multimeter read less than infinity?

1. Does multimeter read more than O ohms?

/

1. Install front main harness

plug on BO DRIVE light.

2. Replace BO DRIVE lamp

unit (page 12-8).

3. Verify no faults found.

1. Replace BO DRIVE light

assembly (page 12-9.

2. Verify no faults found.

3-76

GO TO NEXT PAGE
TM 9-2350-261-20-1 

 

1. Install front main harness plug on BO DRIVE

light.

2. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

3. Remove front main harness circuit 19 (1) and 520

(2) from IR/BO selector jacks (3) and (4).

4. Measure resistance between IR/BO selector jacks

(3) and (4) with selector on BO.

5. Does multimeter read O ohms?

YES

1. Remove front main harness plug (1) from lighting

control switch jack (2).

2. Turn lighting control switch to BO DRIVE.

3. Measure resistance between lighting control switch

jack (2) pins D (3) and F (4).

4. Does multimeter read 0 ohms?

1. Install front main harness

plug on BO DRIVE light.

2. Replace IR/BO selector

switch (page 11-7).

3. Verify no faults found.

1. Install front main harness

plugs on IR/UBO selector

switch jacks.

2. Replace lighting control

switch (page 11-9).

3. Verify no faults found.

3-76
TM 9-2350-261-20-1 

1. Measure resistance between front main harness

circuit 620 plug (1) and lighting control switch plug

(2) pin D (3).

2. Does multimeter read 0 ohms?

1. Install front main harness circuit 520 plug on

IR/BO selector switch jack.

2. Install front main harness plug on light control

switch jack.

3. Repair front main harness circuit 19 (page 14-3).

4. Verify no faults found.

1. Install front main harness

circuit 19 plug on IR/BO

selector switch jack.

2. Repair front main harness

circuit 520 (page 14-3).

3. Verify no faults found.

3-77
TM 9-2350-261-20-1 

SERVICE HEADLIGHTS DO NOT OPERAT E

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D)

Equipment Conditions: 

Personnel Required: Engine stopped/shutdown (see your -10)

Unit Mechanic Carrier blocked (see your -10)

1. Operate lights in all lighting control positions

(see your -10).

2. Do any exterior lights operate in any lighting

control switch positions?

1. Go to no exterior lights

operate (page 3-73).

A

1. Turn main light switch to SER DRIVE.

2. Do both high beams, and/or both low beams fail to

come on?

1.

2.

3.

4.

5.

6.

Turn MASTER SWITCH to OFF.

Remove hull front access cover (page 24-24).

Remove front main harness plug (1) from dimmer

switch jack (2).

Turn MASTER SWITCH to ON.

Measure voltage between front main harness

plug (1) pin G (3) and ground.

Does multimeter read less than 17 volts?

PAGE

PAGE

3-80

3-82

 3-78 
TM 9-2350-261-20-1 

1. Turn MASTER SWITCH to OFF.

2. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

3. Remove front main harness plug (1) from lighting

control switch jack (2).

4. Measure resistance between lighting control switch

jack (2) pins F (3) and M (4).

5. Does multimeter read 0 ohms?

1. Install dimmer switch and

front main harness plug on

dimmer switch jack.

2. Replace lighting control

switch (page 11-9).

3. Verify no faults found.

\

1. Repair front main harness circuit 16 (page 14-3).

2. Verify no faults found.

3-79
TM 9-2350-261-20-1 

1. Remove circuit 17 (high beam) plug (1) or circuit

18 (low beam) plug (2) from failing service

headlight jack (3).

2. Measure voltage on front main harness circuit 17

plug (1) or circuit 18 plug (2) and ground.

3. Does multimeter read less than 17 volts?

1. Is failing headlight located on right side of carrier?

1. Replace service headlight

lamp unit (page 12-5) or

service headlight assembly

(page 12-3). -

2. Verify no faults found.

1. Repair front main harness

circuit 517 or 518 between

left headlight and dimmer

switch.

2. Verify no faults found.

3-80
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

Lower trim vane (see your -10).

Open power plant front access door (see your -10).

Remove right headlight wiring harness plug (1)

from connector jack (2) at carrier bulkhead.

Measure voltage between front main wiring harness

jack (2) pin C (low beam) (3) or pin B (high beam)

(4) and ground.

Does multimeter read less than 17 volts?

1. Turn MASTER SWITCH to OFF.

2. Install right headlight wiring harness circuit 17

(high beam) or 18 (low beam) on service headlight.

3. Repair front main wiring harness circuit 17 or 18

between bulkhead and dimmer switch (page 14-3).

4. Verify no faults found.

1. Repair faulty right headlight wiring harness

(page 14-3).

2. Verify no faults found.

 3-81
TM 9-2360-261-20-1

1. Measure resistance between dimmer switch jack (1)

pins G (2) and E (3) and between pins G (2) and

F (4). Multimeter should read O ohms once and

infinity once.

2. Click dimmer switch and measure resistance

between dimmer switch jack (1) pins G (2) and E

(3) and between pins G (2) and F (4). Multimeter

should read infinity once and O ohms once.

3. Is high beam selector switch operating properly?

YES

1. Repair front main wiring harness circuit 18

(low beam) or circuit 17 (high beam) (page 14-3).

2. Verify no faults found.

1. Replace dimmer switch

(page 12-77).

2. Verify no faults found. I

 3-82 
INFRARED HEADLIGHT(S) DOES NOT OPERATE 

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Electrical Connector Pliers (Item 44, App D)

Digital Multimeter (Item 43 App D)

Personnel Required: 

Unit Mechanic

Helper (H)

References:

see your -10

Equipment Conditions: 

Engine

Carrier

stopped/shutdown (see your -10)

blocked (see your -10)

1. Operate all exterior lights (see you -10).

2. Do any exterior lights operate in any lighting

control switch positions?

YES

1. Turn master light switch to BO DRIVE.

2. Move IR/BO selector switch to IR (see your -10).

3. Do both IR high beams and/or both IR low beams

fail to come on?

1. Go to no exterior lights

operate (page 3-73).

GO TO NEXT PAGE

TM9-2350-261-20-1 

GO TO NEXT PAGE 3-86

 3-83
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

6.

Turn MASTER SWITCH to OFF.

Remove hull front access cover (page 24-24).

Remove front main harness plug (1) from dimmer

switch jack (Z).

Turn MASTER SWITCH to ON.

Measure voltage between front main harness

plug (1) pin C (3) and ground.

Does multimeter read less than 17 volts?

1.

2.

3.

4.

5.

Turn MASTER SWITCH to OFF.

Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

Remove front main harness circuit 514/515 (1) and

520 (2) from IR/BO selector switch jacks

(3 and 4).

Measure resistance between IR/BO selector switch

jacks (3 and 4).

Does multimeter read 0 ohms?

GO TO PAGE 3-88

1. Install dimmer switch and

front main harness plug on

dimmer switch.

2. Replace IR/BO selector

switch (page 11-7).

3. Verify no faults found.

 3-84 
TM9-2350-261-20-1

1. Measure resistance between front main harness

circuit 514/515 selector switch plug (1) and dimm

switch plug (2) pin C (3).

2. Does multimeter read 0 ohms?

1.

2.

3.

4.

5.

Install dimmer switch and front main wiring

harness plug on dimmer switch.

Install front main wiring harness circuit 514/515

plug on IR/BO selector switch jack.

Remove front main harness plug (1) from lighting

control switch jack (2).

Measure resistance between wiring front main

harness lighting control switch plug (1) pin D (3)

and IR/BO selector circuit 520 plug (4).

Does multimeter read 0 ohms?

1. Install dimmer switch and

front main harness plug on

I

dimmer switch.

2. Repair front main harness

circuit 514/515

(page 14-3).

3. Verify no faults found.

1. Repair front main wiring

harness circuit 520

I

(page 14-3).

2. Verify no faults found. I

GO TO NEXT PAGE

er 

 3-85 
TM 9-2350-261-20-1 

1. Install circuit 520 plug on IR/BO selector switch.

2. Replace lighting control switch (page 11-9).

3. Verify no faults found.

1. Remove circuit 514 (high beam) plug (1) or

515 (low beam) plug (2) from failing IR service

headlight (3).

2. Measure voltage between front main harness circuit

514 plug (1) or 515 plug (2) and ground.

3. Does multimeter read less than 17 volts?

N O 1. Replace IR service

headlight lamp unit

(page 12-3).

2. Verify no faults found.

1. Is failing IR headlight located on right side of 1. Repair front main harness

carrier? circuit 514 or 515 between

left IR head light and

YES

dimmer switch

(page 14-3).

2. Verify no faults found.

 3-86 
TM 9-2350-261-20-1 

1. Lower trim vane (see your -10).

2. Open power plant front access door (see your -10).

3. Remove right headlight wiring harness plug (1)

from front main harness jack (2) at bulk head.

4. Measure voltage between front main harness jack

(2) pin F (low beam) (3) or pin E (high beam) (4)

and ground.

5. Does multimeter read less than 17 volts?

1. Install right headlight wiring harness circuit 514 or

515 plug on IR head light.

2. Faulty front main wiring harness

3. Notify your supervisor.

1. Repair faulty right headlight wiring harness circuit

514/515. (page 14-3).

2. Verify no faults found. I

3-87
TM 9-2350-261-20-1 

1. Measure resistance between dimmer switch jack (1)

pins C (2) to A (3) and between pins C (2) to B

(4). Multimeter should read 0 ohms once and

infinity once.

2. Click dimmer switch and repeat above test.

Multimeter should read infinity once and O ohms

once.

3. Is dimmer switch operating properly?

1. Faulty front main wiring harness circuit 514 or

515.

2. Notify your supervisor.

NO 1. Replace dimmer switch

(page 12-77).

I 2. Vefify no faults found.

 3-88
TM 9-2350-261-20-1

SERVICE AND/OR BLACKOUT STOP LIGHTS MALFUNCTIO N

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -10

Digital Multimeter (Item 43, App D)

Equipment Conditions: 

Personnel Required: Engine stopped/shutdown (see your -10)

Unit Mechanic Carrier

Helper (H) Ramp lowered (see your -10)

blocked (see your -10)

1. Operate all exterior lights (see your -10).

2. Do any exterior lights operate in any lighting

control switch positions?

1. Go to no exterior lights

operate (page 3-73).

1. Do service stop and BO stop lights both

malfunction? GO TO PAGE 3-91

1. Check stop light switch adjustment (page 12-133).

2. Is brake switch in proper adjustment?

GO TO NEXT PAGE

1. Adjust stop light switch

(page 12-133).

2. Verify no faults found.

 3-89 
TM 9-2350-261-20-1 

1.

2.

3.

4.

5.

Turn MASTER SWITCH to OFF.

Remove front main harness circuit 75A plug (1)

from stop light switch jack (2).

Remove front main harness circuit 75B plug (3)

from stop light switch jack (4).

Measure resistance between switch jacks (2) and

(4) with switch depressed and with switch released.

Does multimeter read infinity with switch depressed

and O ohms with switch released?

1.

2.

3.

4.

5.

Install front main harness circuit leads 75A and

75B on stop light switch.

Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

Remove front main harness plug (1) from lighting

control switch jack (2).

Measure resistance between front main harness

plug (1) pins K (3) and A (4) with both steering

levers locked in parking brake position.

Does multimeter read 0 ohms?

I

1. Replace main light switch (page 11-9).

2. Verify no faults found.

3-90

NO 1. Replace stop light switch

(page 12-132).

2. Verify no faults found.

NO 1. Faulty front main harness

circuit 75A and/or 75B.

I 2. Notify your supervisor.
TM 9-2350-261-20-1

1.

2.

3.

4.

Remove rear main harness circuit 22 plug (1) from

jack (2) on malfunctioning left tail light, or circuit

23 plug from jack on malfunctioning right tail

light.

Turn main light switch lever on lighting control

switch to STOP LIGHT or to BO MARKER.

Measure voltage between circuit 22 (Ieft) plug (1)

or circuit 23 (right) plug and ground with both

steering levers locked in parking brake position.

Does multimeter read less than 17 volts?

1.

2.

3.

Remove rear main harness circuit 22 plug (left) (1)

or circuit 23 plug (right) (2) from front main wiring

harness circuit 22 jack (3) or circuit 23 jack (4).

Measure voltage between rear main harness circuit

22 jack (2) or circuit 23 jack (3) and ground.

Does multimeter read less than 17 volts?

GO TO NEXT PAGE

NO 1. Install rear main harness

jack on tail light.

2. Replace service stop or BO

stop light bulb

(page 12-3).

3. Verify no faults found.

NO 1. Repair rear main harness

circuit 22 or circuit 23

I

(page 14-3).

2. Verify no faults found.

3-91
TM 9-2350-261-20-1 

1. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

2. Remove front main harness plug (1) from lighting

control switch (2).

3. Measure resistance between lighting control switch

plug (1) pin C (3) to circuit 22 jack (4) (service

stop) or pin N (5) to circuit 23 jack (6) (BO stop) .

4. Does multimeter read 0 ohms?

YES

1. Install rear main harness plugs on jack and tail

light.

2. Replace main light switch (page 11-9).

3. Verify no faults found.

1. Install rear main harness

on tail light.

2. Repair front main harness

circuit 22 or 23

(page 14-3).

3. Verify no faults found.

3-92
TM 9-2350-261-20-1

BLACKOUT MARKER LIGHT(S) AND/OR TAIL LIGHT(S) DO NO T

OPERAT E

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Unit Mechanic

Helper (H)

References

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Operate all exterior lights (see your -10).

2. Do any exterior lights operate in any lighting

control switch positions?

YES

1. Turn lighting control switch to BO MARKER.

2. Is just one BO marker and/or just one BO tail

light out?

1. Go to no exterior lights

operate (page 3-73).

PAGE 3-96

GO TO NEXT PAGE

3-93
TM 9-2350-261-20-1

1. Locate failing light(s).

2. Remove circuit 20 plug (1) (BO marker) and/or

circuit 24 plug (2) (BO tail light) from failing light

jack.

3. Measure voltage between plug pin and ground.

4. Does multimeter read less than 17 volts?

1. Replace faulty light bulb.

For BO marker light

(page 12-7). For left/right

tail light (page 12-13).

2. Verify no faults found.

1. Repair rear main wiring

harness circuit 24

(page 14-3).

2. Verify no faults found.

1. Is one front BO marker light not operating?

3-9 4
TM 9-2350-261-20-1

1. Is right BO marker light out? 1. Repair front main wiring

harness circuit 20

1. Lower trim vane (see your -10).

2. Open power plant front access door (see your -10).

3. Remove right headlight wiring harness plug (1)

from front main harness jack (2) at carrier

bulkhead.

4. Measure voltage between front main harness

jack (2) pin D (3) and ground.

5. Does multimeter read less than 17 volts?

1. Install right headlight wiring harness circuit 20

jack on right BO marker light.

2. Repair front main harness circuit 20 (page 14-3).

3. Verify no faults found.

(page 14-3).

2. Verify no faults found.

1. Repair right headlight wiring harness (page 14-3).

2. Verify no faults found.

3-95
TM 9-2350-261-20-1

1. Are only both BO tail lights out or only both BO

markers out?

1. Are both BO tail lights out? 1. Repair front main harness

circuit 20 (page 14-3).

2. Verify no faults found.

1. Remove rear main harness circuit 24 plug (1) from

front main harness circuit 24 jack (2).

2. Measure voltage between front main harness

jack (2) pin and ground.

3. Does multimeter read less than 17 volts?

1. Repair front main harness circuit 24 (page 14-3).

2. Verify no faults found.

1. Repair rear main harness

circuit 24 (page 14-3).

2. Verify no faults found.

3-96
1. Turn MASTER SWITCH to OFF.

2. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2). - —

3. Remove front main harness plug (1) from lighting

control switch jack (2). - -

4. Measure resistance between switch jack (2) pins F

(3) and E (4).

5. Does multimeter read 0 ohms?

1. Repair front main harness circuit 20/24

(page 14-3).

2. Verify no faults found.

TM 9-2360-261-20-1

1. Replace main light switch

(page 11-9).

2. Verify no faults found.

3-97
TM 9-2350-261-20-1

SERVICE TAIL LIGHT DOES NOT OPERAT E

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Unit Mechanic

References:

see your -10

Equipment Conditions

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Operate exterior lights in all positions

(see your -10).

2. Do any exterior lights operate in any lighting

control switch positions?

1. Turn main light switch on lighting control switih

to SER DRIVE.

2. Remove rear main harness circuit 21 plug (1) from

left tail light jack (2).

3. Measure voltage between rear main harness circuit

21 plug (1) and ground.

4. Does multimeter read less than 17 volts?

1. Go to no exterior lights

operate (page 3-73).

1. Replace service tail light

bulb (page 12-13).

2. Verify no faults found.

3-98
1. Remove rear main harness circuit 21 plug (1) from

front main harness circuit 21 jack (2) on

instrument panel.

2. Measure voltage between front main harness

jack (2) and ground.

3. Does multimeter read less than 17 volts?

1. Turn MASTER SWITCH to OFF.

2. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

3. Remove front main harness plug (1) from lighting .

control switch jack (2).

4. Measure resistance between lighting control switch .

jack (2) pin H (3) and circuit 21 jack (4).

1. Does multimeter read O ohms?

1. Repair rear main harness

circuit 21 (page 14-3).

2. Verify no faults found.

1. Install rear main harness circuit 21 plug on left

tail light jack.

2. Replace main light switch (page 11-9).

3. Verify no faults found.

1. Install rear main harness

circuit 21 plug on left tail

light jack.

2. Repair front main harness

circuit 21 (page 14-3).

3. Verify no faults found.

3-99

TM 9-2350-261-20-1
TM 9-2350-261-20-1

TRAILER LIGHTS DO NOT OPERAT E

INITIAL SETU P

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43. App D)

Personnel Required:

Unit Mechanic

Helper (H)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Operate all exterior lights (see your -10).

2. Do any exterior lights operate in any lighting

control switch positions?

1. Go to no exterior lights

operate (page 3-73).

1. Remove trailer plug from carrier trailer receptacle. 1. Troubleshoot carrier

2. Do all carrier exterior lights operate properly? exterior lights

(see chapter 3).

1. Turn MASTER SWITCH to OFF.

2. Measure resistance between vehicle trailer

receptacle (1) pin L (2) and ground.

3. Does multimeter read O ohms?

1. Replace trailer receptacle

harness (page 17-2).

2. Verify no faults found.

3-100
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to ON.

2. Turn lighting control switch to BO marker.

3. Measure voltage between trailer receptacle (1) pins

A (2), C (3), and F (4) to ground with steering

levers pulled back.

4. Does multimeter read 17 volts or more for all readings?

1. Turn lighting control switch to SER DRIVE.

2. Measure voltage between trailer receptacle (1) pins

B (2) and E (3) to ground with steering levers

pulled back.

3. Does multimeter read 17 volts or more?

1. Faulty trailer harness and/or lights.

2. Notify your supervisor.

4

1. Replace trailer receptacle

harness (page 17-2).

2. Verify no faults found.

3-101

1. Replace trailer receptacle

harness (page 17-2).

2. Verify no faults found.
TM 9-2350-261-20-1

HORN DOES NOT OPERAT E

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Jumper Wire

Personnel Required:

Unit Mechanic

Helper (H)

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10) -

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

1. Turn MASTER SWITCH to ON.

2. Is MASTER POWER indicator on?

1. Remove horn ground lead plug (1) from horn

jack (2).

2. Measure continuity between horn ground lead

plug (1) and ground.

3. Does multimeter read 0 ohms?

1. Go to Master Switch On

Indicator Does Not Light

(page 3-129).

1. Replace horn ground lead

and/or connector

(page 12-2).

2. Verify no faults found.

References:

3-102
TM 9-2350-261-20-1

1. Remove right headlight wiring harness circuit 25

plug (1) from horn iack (2).

2. Turn MASTER SWlTCH to ON.

3. Measure voltage between right headlight wiring

harness circuit 25 plug (1) and ground with horn

button depressed.

4. Does multimeter read less than 17 volts?

GO TO NEXT PAGE

1. Replace horn (page 12-2).

2. Verify no faults found.

3-103
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Install jumper wire between right headlight wiring

harness circuit 25 plug (1) and ground.

3. Remove right headlight wiring harness plug (2)

from front main harness (3) at carrier bulkhead.

4. Measure resistance between right headlight wiring

harness plug (2) pin A (4) and ground.

5. Does multimeter read O ohms?

1. Remove jumper wire.

2. Repair right headlight wiring harness circuit 25

(page 14-3).

3. Verify no faults found.

3-104
1. Remove circuit 25/25A plug (1) from horn switch

jack (2).

2. Measure resistance between horn switch jack (2)

pins with horn switch depressed.

3. Does multimeter read 0 ohms?

1. Install right headlight wiring harness plug to front

main harness jack at fire

wall.

2. Install horn ground lead

plug to horn jack.

3. Install right headlight wiring harness circuit 25 plug

onto horn jack.

4. Replace horn switch

(page 11-24).

5. Verify no faults found.

GO TO NEXT PAGE

3-105

TM 9-2350-261-20-1
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

Remove jumper wire from right headlight wiring

harness circuit 25.

Install circuit 25 plug on horn jack.

Install a jumper wire between horn switch plug (1)

circuit 25 pin (2) and ground.

Measure resistance between front main harness

jack (3) pin A (4) and ground.

Does multimeter read O ohms?

1. Remove jumper wire from instrument panel cable

assembly circuit 25A.

2. Repair instrument panel cable assembly circuit 25A

(page 14-3).

3. Verify no faults found.

1. Remove jumper wire from

horn switch plug.

2. Repair front main harness

circuit 25 (page 14-3).

3. Verify no faults found.

3-106
TM 9-2350-261-20-1

INSTRUMENT PANEL ILLUMINATION LIGHTS MALFUNCTIO N

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Unit Mechanic

Helper (H)

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (me your -10)

1. Operate all exterior lights (see your -10). 1. Go to no exterior lights

2. Do any exterior lights operate in my lighting operate (page 3-73).

control switch positions?

1. Remove instrument panell illumination light cover

lenses (1 and 2) and gaskets (3 and 4).

2. Operate lighting control switch to DIM and BRT

positions (see your -10).

3. Do both lights malfunction?

1. Remove malfunctioning bulbs from instrument panel

illumination light indicator assemblies.

2. Measure resistance between bulb center contact (1)

and bulb base (2) of each bulb.

3. Does multimeter read 0-5 ohms?

GO TO NEXT PAGE

GO TO PAGE 3-109

1. Replace light bulbs as

required (page 11-5).

2. Verify no faults found.

3-107
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Install instrument panel light buIbs.

3. Install instrument panel illumination light cover

lenses and gaskets.

4. Remove instrument panel for access (page 11-2).

5. Remove front main harness plug (1) from lighting

control switch jack (2).

6. Remove from main harness circuit 40 plug (3) from

either illumination light jack (4).

7. Measure resistance between front main harness

lighting control switch plug (1) pin B (5) and

illumination light plug circuit 40 (3).

8. Does multimeter read O ohms?

1. Replace main light switch (page 11-9).

2. Verify no faults found.

1. Repair front main harness

circuit 40 (page 14-3).

2. Verify no faults found.

3-108
TM 9-2350-261-20-1

1. Remove malfunctioning bulb from instrument panel

illumination light indicator assembly.

2. Measure resistance between bulb center contact (1)

and bulb base (2).

3. Does multimeter read 0-5 ohms?

1. Remove instrument panel for access (page 11-2).

2. Remove front main harness plug (1) from lighting

control switch jack (2).

3. Remove front main harness circuit 40 plug (3)

or (4) from failing instrument panel light (5 or 6).

4. Measure resistance between front main harness

lighting control switch plug (1) pin B (7) and

failing circuit 40 light plug (3 or 4).

5. Does multimeter read O ohms?

1. Install front main harness plug on lighting control

switch jack.

2. Replace instrument panel light assembly

(page 11-5).

3. Verify no faults found.

1. Install bulbs.

2. Repair front main harness

circuit 40 (page 14-3).

3. Verify no faults found.

3-109

1. Replace light bulb as 1

required (page 11-5).

2. Verify no faults found.
TM 9-2350-261-20-1

DOME LIGHT(S) WORK IMPROPERL Y

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Unit Mechanic

Helper (H)

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Turn MASTER SWITCH to ON. Go to Master Switch On

2. Is MASTER POWER indicator ON? Indicator Does Not Light

(page 3-129).

1.

2.

3.

4.

Remove rear main harness plug (1) from jack

on failing dome light.

Turn MASTER SWITCH to ON.

Measure voltage between rear main harness

plug (1) and ground.

Does multimeter read 17 volts or more?

( 2

1. Install rear main harness plug on dome light. 1. Replace dome light bulbs

2. Have dome light bulbs been replaced? (page 12-62).

2. Verify no faults found.

1. Replace dome light assembly (page 12-61).

2. Verify no faults found.

3-110
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Remove instrument panel for access (page 11-2).

3. Remove rear main harness circuit 38 plug (1) from

instrument panel cable assembly circuit 38 jack (2).

4. Remove instrument panel cable assembly circuit 27

plug (3) from instrument panel circuit breaker

jack (4).

5. Measure resistance between instrument panel cable

assembly circuit 38 jack (2) and circuit 27 plug (3).

6. Does multimeter read O ohms?

1. Repair rear main harness circuit 38 (page 14-3).

2. Verify no faults found.

1. Install rear main harness

plug on dome light jack.

2. Repair instrument panel

cable assembly circuit 38

(page 14-3).

3. Verify no faults found.

3-111
TM 9-2350-261-20-1

INFRARED PERISCOPE WORKS IMPROPERL Y

INITIAL SETUP

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your-10)

Periscope stowed (see your -10)

I.R. power switch OFF (see your-10)

1. Turn MASTER SWITCH to ON. 1. Go to: Master switch on

2. Is MASTER SWITCH indicator light ON? indicator does not light (page

.

3-129).

WARNING

High voltage in the M19

periscope can cause serious

injury or death. Voltage

could exceed 16,000 volts.

To avoid accidents, observe

the following

Always connect power cable to periscope

before turning MASTER SWITCH and

infrared (I.R.) POWER switch to ON.

Before disconnecting power cable from

M19 periscope, always wait at least two

minutes after turning infrared (I.R.)

POWER switch and MASTER SWITCH

OFF.

Do not disconnect power cable until image

disappears from periscope screen.

Never touch end of power cable, or allow it

to contact metal surfaces.

1. Replace I.R. power pack with known good power pack

(page 12-134 or 12-137).

3-112 Change 1
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to ON.

2. Turn I.R. switch to ON (See your -10).

3. Does I.R. periscope work?

1. Replace original I.R. power pack

(page 12-134 or 12-137).

2. Verify no faults found.

1. Remove periscope power circuit 517 lead (1) from I.R.

power pack (2).

2. Measure resistance between lead ends (1) and (3)

(inner and outer).

3. Does multimeter read O ohms both times?

1. Replace I.R. periscope power

lead.

2. Install original I.R. power

pack

(page 12-134 or 12-137).

3. Verify no faults found.

GO TO NEXT PAGE

Change 1 3-113
TM 9-2350-261-20-1

1. Remove circuit plugs 516 (1) and 516A (2) from I.R.

POWER switch jacks (3) and (4).

2. Measure resistance between I.R. POWER switch jacks

(3) and (4) with switch ON.

3. Does multimeter read O ohms?

1. Remove instrument panel cable assembly circuit 27

plug (1) from instrument panel circuit breaker (2).

2. Measure resistance between circuit 516 plug (3) and

circuit 27 plug (1).

3. Does multimeter read O ohms?

1. Replace I.R. POWER switch

(page 11-7).

2. Install original I.R. power

pack

(page 12-134 or 12-137).

3. Verify no faults found.

1. Repair instrument panel

cable assembly circuit 516

(page 14-3).

2. Install original I.R. power

pack

(page 12-134 or 12-137).

3. Verify no faults found.

3-114 Change 1
TM 9-2350-261-20-1

1. Remove cable assembly circuit 5160A plug (1) from I.R.

power pack (2).

2. Turn MASTER SWITCH to ON.

3. Tum I.R. POWER switch to ON.

4. Measure voltage between cable assembly circuit 516A

plug (1) and ground.

5. Turn MASTER SWITCH to OFF.

6. Did multimeter read less than 17 volts?

1. Faulty I.R. periscope.

2. Install original I.R. power pack

(page 12-134 or 12-137).

3. Notify your supervisor.

1. Repair front main harness

circuit 516A (page 14–3).

2. Install original I.R. power

pack

(page 12-134 or 12-137).

3. Verify no faults found.

Change 1 3-115
TM 9-2350-261-20-1

RADIO(S) DOES NOT WOR K

INITIAL SETU P

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D)

Jumper Wire Equipment Conditions:

Carner blocked (see your -10)

Personnel Required: Ramp lowered (see your -10)

Unit Mechanic

Helper (H)

1.

2.

3.

Remove radio plug (1) from receptacle (2).

Measure voltage between receptacle jack (2) pins A

and B.

Does multimeter read less than 17 volts?

1. Remove circuit 48 lead from battery positive

terminal (page 13-2).

2. Install a jumper wire between circuit 48 lead and

ground.

3. Measure resistance between receptacle jack pin A

and ground.

4. Does multimeter read O ohms?

1. Remove jumper wire.

2. Service earner batteries (see your -10).

3. Verify no faults found.

1. Faulty radio or mount.

2. Notifiy your supervisor.

1. Remove jumper wire.

2. Repair wiring harness

circuit 48 (page 14-3).

3. Verify no faufis found.

3-116
TM 9-2350-261-20-1

DOME LIGHTS MALFUNCTION (M577A2 ONLY)

INITIAL SETU P

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D)

Equipment Conditions:

Personnel Required:

Engine stopped/shutdown (see your -10)

Unit Mechanic Ramp lowered (see your -10)

Helper (H)

1. Turn MASTER SWITCH to ON (see your-10).

2. Turn BLACKOUT BYPASS switch to ON.

3. Do white dome lights come on?

1. Turn BLACKOUT BYPASS switch to OFF.

2. Operate rear dome light switch.

3. Operate front dome light switch.

4. Do blackout lights malfunction?

1. Remove circuit 38E (1) and 38A (2) plugs from rear

dome light switch jacks (3 and 4).

2. Install a jumper wire between circuit 38E and 38A

plugs (1 and 2).

3. Operate front dome light switch.

4. Do blackout dome lights malfunction?

G O

G O

G O

T O

T O

T O

PAG E

PAG E

3-119

3-119

PAGE 3-120

CHANGE 3 3-117
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Install circuit 38E and 38A plugs on rear dome light

switch.

3. Remove eight nuts (1), washers (2) and screws (3) from

master switch panel (4). Pull panel away from

distribution box.

4. Remove circuits 10 (5) and 38A (6) plugs from circuit

breaker (7) and front dome light switch (8).

5. Install a jumper wire between circuit 10 and 38A plugs.

6. Turn MASTER SWITCH to ON.

7. Operate rear dome light switch.

1. Remove jumper wire from circuits 10 and 38A plugs.

2. Measure voltage at circuit 10 plug.

3. Does multimeter read 17 volts or more?

GO TO PAGE 3-120.1

1. Turn MASTER SWITCH to

OFF.

2. Repair/replace wiring

harness 10917788

1. Turn MASTER SWITCH to OFF.

2. Repair wiring harness circuit 38A (page 14-3).

3. Verify no faults found.

(page 14-3).

3. Verify no faults found.

3-118 Change 3

1. Remove jumper from circuite 38E and 38A plugs.

2. Measure voltage at circuit 38E plug.

3. Does multimeter read 17 volts or more?

1. Turn MASTER SWITCH to

OFF

2. Repair rear main harness

circuit 38E (page 14-3).

3. Verify no faults found.

8. Do blackout dome lights still malfunction?
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Remove eight nuts (1), washers (2), and screws (3)

from master switch panel (4). Pull panel away

from distribution box (5).

3. Remove circuit 10 plugs (6) from circuit breaker

jacks (7).

4. Measure resistance between circuit breaker

jacks (7).

5. Does multimeter read 0 ohms?

1. Repair circuit 10 lead assembly from the circuit

breaker to the front dome light switch.

2. Verify no faults found.

1. Replace circuit breaker

(page 12-70).

2. Verify no faults found.

1. Adjust the ramp door

switch (page 12-75.

2. Verify no faults found.

1. Replace ramp door switch (page 12-74).

2. Verify no faults found.

3-119

1. Has the ramp door switch been adjusted?
TM 9-2350-261-20-1

1.

2.

3.

4.

Turn blackout dome lights on using front dome

light switch.

Remove circuit 38 plug (1) from rear dome light

switch jack (2).

Measure voltage between circuit 38 plug (1) and

ground.

Does multimeter read 17 volts or more?

1. Turn MASTER SWITCH to OFF.

2. Replace rear dome light switch (page 12-69).

3. Verify no faults found.

1. Turn MASTER SWITCH

to OFF.

2. Repair rear main harness

circuit 38 (page 14-3)

3. Verify no faults found.

3-120
TM 9-2350-261-20-1

1.

2.

3.

4.

Turn dome lights on using rear dome light switch.

Remove circuit 38 plug (1) from front dome light switch

jack (2).

Measure voltage between circuit 38 plug (1) and

ground.

Does multimeter read 17 volts or more?

1. Turn MASTER SWITCH to OFF.

2. Remove jumper wire from circuit 10 and 38 plugs.

3. Replace front dome light switch (page 12-68).

4. Verify no faults found.

1. Turn MASTER SWITCH to

OFF.

2. Repair wiring harness

circuit 38 (page 14-3).

3. Install master switch panel

on distribution box.

4. Verify no faults found.

Change 3 3-120.1
TM 9-2350-261-20-1

BLACKOUT DOME LIGHTS DO NOT WORK (M1068 ONLY)

INITIAL SETU P

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D) See M1068 Wiring Diagrams (FO-9 & FO-10)

Personnel Required: Equipment Conditions:

Unit Mechanic Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Disconnect cable W28 plug P2 (1) from dome light

lead (2).

2. Ensure ramp door is open or ramp is down.

3. Turn MASTER SWITCH to ON.

4. Turn on either front dome light switch (3) on master

switch panel in driver’s compartment or rear dome light

switch (4) on switch panel next to ramp opening.

5. Measure voltage between plug P2 (1) and ground.

6. Does multimeter read 17 volts or more?

1. Turn MASTER SWITCH to OFF.

2. Have dome light bulbs been replaced?

1. Repair dome light assembly (page 12-65).

2. Verify no faults found.

3-120.2 Change 3

1. Replace dome light bulbs

(page 12-64).

2. Verify no faults found.
TM 9-2350-261-20-1

1. Turn dome lights on using rear dome light switch.

2. Remove circuit 38 plug (1) from front dome light

switch jack (2).

3. Measure voltage between circuit 38 plug (1) and

ground.

4. Does multimeter read 17 volts or more?

1. Turn MASTER SWITCH to OFF.

2. Remove jumper wire from circuit 10 and 38 plugs.

3. Replace front dome light switch (page 12-68).

4. Verify no faults found.

1. Turn MASTER SWITCH

to OFF.

2. Repair wiring harness

circuit 38 (page 14-3).

3. Install master switch panel

on distribution box.

4. Verify no faults found.

3-121
TM 9-2350-261-20-1

RIGHT REAR UTILITY OUTLET/ADMITTANCE BUZZER WORK S

IMPROPERLY (M577A2 AND M1068 ONLY)

INITIAL SETU P

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D)

Jumper Wire Equipment Conditions:

Personnel Required: Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Unit Mechanic MASTER SWITCH turned to ON

Helper (H) (see your -10)

1. Does either the right rear utility outlet or the admittance buzzer operate?

1. Does the admittance buzzer operate correctly?

1.

2.

3.

Remove circuit 37A plug (1) from utility outlet jack (2).

Measure voltage between circuit 37A plug (1) and

ground.

Does multimeter read less than 17 volts?

1. Turn MASTER SWITCH to OFF.

2. Repair rear main wiring harness (page 14-3).

3. Verify no faults found.

3-122 Change 3

1. Turn MASTER SWITCH to

OFF (see your -10).

2. Replace utility outlet receptacle (page 17-9).

3. Verify no faults found.

GO TO PAGE 3-124
TM 9-2350-261-20-1

1.

2.

3.

4.

Remove eight nuts (1), washers (2), and screws (3)

from master switch panel (4). Pull panel away

from distribution box (5).

Remove circuit 10 and 37A plugs (6 and 7) from

circuit breaker jacks (8 and 9).

Measure resistance between circuit breaker jacks

(8 and 9).

Does multimeter read 0 ohms?

1. Turn MASTER SWITCH to ON.

2. Measure voltage at circuit 10 plug.

3. Does multimeter read less than 17 volts?

1. Replace circuit breaker

(page 17-11).

2. Verify no faults found.

1. Turn MASTER SWITCH

to OFF.

2. Repair rear main wiring

harness circuit 37A

(page 14-3).

3. Verify no faults found.

1. Turn MASTER SWITCH to OFF.

2. Repair circuit 10 in master switch panel from the

bus bar to the circuit breaker (page 14-3).

3. Verify no faults found.

3-123
TM 9-2350-261-20-1

1. Remove circuit 509 plug (1) from admittance buzzer

jack (2).

2. (H) Depress admittance buzzer switch.

3. Measure voltage between circuit 509 plug (1) and

ground.

4. Does multimeter read less than 17 volts?

1. Remove rear main harness circuit 509 plug (1)

from admittance buzzer switch (2).

2. Install a jumper wire between admittance buzzer

circuit 509 plug (1) and ground.

3. Measure voltage across two pin contacts of circuit

509 plug (1) from admittance buzzer switch.

4. Does multimeter read less than 17 volts?

1. Turn MASTER SWITCH to OFF.

2. Remove jumper wire.

3. Repair rear main wiring harness circuit 509

(page 14-3).

4. Verify no faults found.

1. Turn MASTER SWITCH

to OFF.

2. Replace admittance buzzer

(page 12-72).

3. Verify no faults found.

1. Turn MASTER SWITCH

to OFF.

2. Replace admittance buzzer

switch (page 12-72).

3. Verify no faults found.

3-124
TM 9-2350-261-20-1

LEFT REAR UTILITY OUTLET/BLOWER DOES NOT WOR K

(M577A2 AND M1068 ONLY)

INITIAL SETU P

Tools:

General Mechanics

Digital Multimeter

References:

Tool Kit (Item 30, App D) See your –10

(Item 43, App D)

Equipment Conditions:

Personnel Required: Engine stopped/shutdown (see your -10)

Unit Mechanic Carrier blocked (see your -10)

Helper (II) MASTER SWITCH turned to ON

(see your –10)

1. Does either the blower or the left rear utility outlet

work?

1. Does the blower operate normally?

1. Remove rear main harness circuit 37B plug (1)

from left rear utility outlet jack (2).

2. Measure voltage between circuit 37B plug (1) and

ground.

3. Does multimeter read less than 17 volts?

GO TO NEXT PAGE

1. Turn MASTER SWITCH

to OFF.

2. Replace utility outlet receptacle (page 17-9).

3. Verify no faults found.

Change 3 3-125

GO TO PAGE 3-127

GO TO PAGE 3-128
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Remove eight nuts (1), washers (2), and screws (3)

from master switch panel (4) and distribution box

(5). Pull panel away from distribution box.

3. Remove circuit 37B plug (6) from circuit breaker

jack (7).

4. Turn MASTER SWITCH to ON.

5. Measure voltage between circuit breaker jack (7)

and ground.

6. Does multimeter read less than 17 volts?

1. Remove circuit 10 plug (1) from circuit breaker jack

(2).

2. Measure voltage between circuit 10 plug (1) and

ground.

3. Does multimeter read less than 17 volts?

1. Turn MASTER SWITCH

to OFF.

2. Repair rear main wiring

harness circuit 37B

(page 14–3).

3. Verify no faults found.

1. Turn MASTER SWITCH

to OFF.

2. Replace circuit breaker

(page 17-11).

3. Verify no faults found.

3-126
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Repair circuit 10 lead from bus bar to circuit breaker (page 14-3).

3. Install master switch panel on distribution box.

4. Verify no faults found.

1. Remove eight nuts (l), washers (2), and screws (3)

from master switch panel (4) and distribution box

(5). pull panel away from distribution box.

2. Remove circuit 37B plug (6) from circuit breaker

jack (7) and two circuit 10 plugs (8 and 9) from

circuit breaker jacks (10 and 11).

3. Measure resistance between circuit breaker contacts.

4. Does multimeter read O ohms?

YES

1. Repair circuit 10 from bus bar to circuit breaker

(page 14-3).

2. Install master switch panel on distribution box.

3. Verify no faults found.

1. Replace circuit breaker

(page 17-11).

3. Verify no faults found.

3-127
1.

2,

3.

4,

Remove circuit 59 plug (1) from blower motor

jack (2).

Turn BLOWER SWITCH to ON.

Measure voltage between circuit 59 plug (1) and

ground.

Does multimeter read less than 17 volts?

1. Turn MASTER SWITCH to OFF.

2.

9.

4.

6.

6.

Install a jumper wire between circuit 59 plug at

blower motor and ground.

Remove eight nuts (1), washers (2), and screws (3)

from master switch panel (4) and distribution box

(5). Pull panel away from distribution box.

Remove circuit 59 plugs (6) from blower switch (7).

Check for continuity between circuit 59 plugs (6).

Does multimeter read 0 ohms?

1. Repair wiring harness circuit 59 from circuit

breaker to blower switch (page 14-3).

2. Install master switch panel on distribution box.

3. Verify no faults found.

1. Replace blower motor

(page 17-15).

2. Verify no faults found.

1. Replace blower switch

(page 17-16).

2. Install master switch panel

on distribution box.

3. Verify no faults found.

3-128

TM 9-2350-261-20-1
TM 9-2350-261-20-1

MASTER SWITCH ON INDICATOR DOES NOT LIGH T

INITIAL SETU P

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Remove MASTER SWITCH ON indicator cover lens

(1), gasket (2), bulb (3), and gasket (4).

2. Measure resistance between bulb center contact (5)

and bulb base (6).

3. Does multimeter read less than infinity?

1. Turn MASTER SWITCH to ON (See your -10).

2. Is BATTERY/GENERATOR indicator in the green

.

GO TO NEXT PAGE

1. Replace MASTER SWITCH

ON bulb (page 11-5).

2. Verify no faults found.

GO TO PAGE 3-131

3-129
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

3. Remove circuit 10 plug (1) and circuit 27 plug (2)

from instrument panel circuit breaker jacks (3)

and (4).

4. Measure resistance between circuit breaker

jacks (3 and 4).

5. Does multimeter read 0 ohms?

1. Replace instrument panel

circuit breaker (page 11-4).

2. Verify no faults found.

3-130
TM 9-2350-261-20-1

1. Remove circuit 459 plug (1) from MASTER

SWITCH ON indicator jack (2).

2. Measure resistance between circuit 27 plug (3) and

circuit 459 plug (1).

3. Does multimeter read 0 ohms?

1. Replace indicator light assembly (page 11-5).

2. Verify no faults found.

1. Turn MASTER SWITCH to OFF.

2. Inspect carrier batteries (page 13-3).

3. Are batteries in proper maintenance and well

charged?

1. Repair instrument panel

cable assembly

(page 14-9).

2. Verify no faults found.

1. Service carrier batteries

(see your -10).

2. Verify no faults found.

GO TO NEXT PAGE

3-131
1. Remove eight nuts (l), washers (2), and screws (3)

from master switch panel (4). Pull panel away

from distribution box (5).

2. Inspect circuit 6 terminal end on master switch (6).

3. Is terminal end and master switch free from

corrosion and/or other damage?

1. Turn MASTER SWITCH to ON (see your -10).

2. Measure voltage between master switch terminals

(1) and ground.

3. Does multimeter read more than 17 volts?

1. Repair battery to master

power cable (page 14-9).

2. Verify no faults found.

1. Replace master switch

(page 9-13).

2. Verify no faults found.

3-132

TM 9-2350-261-20-1
TM 9-2350-261-20-1

1. Inspect cable 49 (1) from master switch to

distribution box.

2. Are cable and cable ends frkee from corrosion and

damage?

1. Repair master power harness (page 14-3).

2. Verify no faults found.

1. Repair master power to

distribution box cable

(page 14-9).

2. Verify no faults found.

3-133
TM 9-2350-261-20-1

FUEL LEVEL INDICATOR MALFUNCTION S

INITIAL SETU P

Tools:

General Mechanics

Digital Multimeter

Jumper Wire

Tool Kit (Item 30, App D)

(Item 43, App D)

Personnel Required:

Unit Mechanic

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Turn MASTER SWITCH to ON (me your -10). Go to Master Switch On

2. Is MASTER SWITCH INDICATOR light ON? Indicator Does Not Light

(page 3-129).

1. Is carrier equipped with dual fuel tanks?

1. Does indicator malfunction with FUEL TANK

indicator switch on LEFT and on RIGHT?

GO TO PAGE

GO TO PAGE

3-137

3-138

3-134
TM 9-2350-261-20-1

1. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

2. Remove circuit 28 plug (1) from FUEL TANK

switch jack (2).

3. Remove circuit 29 or 31A plug (3) from FUEL

TANK switch jack (4).

4. Remove circuit 30 or 30A plug (5) from FUEL

TANK switch jack (6).

5. Turn FUEL TANK switch to LEFT and measure

resistance between FUEL TANK switch jack (2)

and FUEL TANK switch jack (6).

6. Turn FUEL TANK switch to RIGHT and measure

resistance between FUEL TANK switch jack (2)

and FUEL TANK switch jack (4).

7. Did multimeter read O ohms both times?

1. Replace FUEL TANK select switch (page 11-7).

2. Verify no faults found.

GO TO NEXT PAGE

3-135
TM 9-2350-261-20-1

1. Remove circuit 27 plug (1) from instrument panel

circuit breaker jack (2).

2. Remove circuit 27A plug (3) from fuel level

indicator jack (4).

3. Measure resistance between circuit 27 plug (1) and

circuit 27A plug (3) .

4. Does multimeter read 0 ohms?

1. Install circuit 29 or 31A plug and circuit 30 or 30A

plug onto fuel level switch jacks.

2. Remove circuit 28 lead (1) from FUEL LEVEL

indicator jack (2).

3. Measure resistance between circuit 28 lead ends

ends (1) and (3).

4.Does multimeter read 0 ohms?

1. Install circuit 28 lead on FUEL TANK switch jack.

2. Replace FUEL LEVEL indicator (page 11-11).

3. Verify no faults found.

1. Install circuit 29 or 31A

and 30 or 30A plugs on

FUEL TANK switch.

2. Repair instrument panel

cable assembly circuit 27A

(page 14-3).

3. Verify no faults found.

1. Replace circuit 28 lead

(page 14-3).

2. Verify no faults found.

3-136
TM 9-2350-261-20-1

1. Remove circuit 28 plug (1) from fuel tank jack (2).

2. Turn MASTER POWER switch to ON.

3. Does fuel indicator read full?

1. Repair circuit 28 lead to

fuel tank sender

(page 14-3 ).

2. Verify no faults found.

1. Install jumper wire between circuit 28 plug and

ing unit

1. Replace fuel quantity sendground.

2. Does fuel quantity gage fail to read empty? (page 6-9 or 6-32).

2. Verify no faults found.

1.

2.

3.

4.

5.

6.

Turn MASTER POWER switch to OFF.

Remove instrument panel for access (page 11-2).

Remove circuit 27A plug (1) from fuel quantity

gage jack (2).

Remove circuit 27 plug (3) from instrument panel

circuit breaker jack (4).

Measure continuity between circuit 27 plug (3) and

circuit 27A plug (1).

Does multimeter read 0 ohms?

1. Replace fuel quantity gage (page 11–11).

2. Verify no faults found.

1. Repair instrument panel

cable assembly

(page 14–9).

2. Verify no faults found.

3-137
TM 9-2350-261-20-1

1. Remove circuit 29 (M577A2 only) or 31A (M981 and

M1064 only) plug (1) from right tank (2) or circuit 30 or

30A (M981 and M1064 only) plug (3) from left tank (4).

2. Turn FUEL TANK switch to failing side.

3. Does indicator read full scale?

1. Install jumper wire between plug removed above and

ground.

2. Does fuel indicator fail to read empty?

1. Repair main harness circuit

29 or 30 (M577A2 only), or

30 or 31A (M981 and M1064

only) (page 14-3).

2. Verify no faults found.

1. Replace FUEL LEVEL

transmitter for M577A2,

page 6-54 and M981 and

M1064, page 6–32.

2. Verify no faults found.

GO TO NEXT PAGE

3-138 Change 2
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

Remove instrument panel for access. See task: remove

instrument panel mounts and ground lead (page 11-2).

Remove circuit 29 M577A2 only) or 31A (M981 and

M1064 only) plug (1) (right tank) or circuit 30A plug (2)

(left tank) from FUEL TANK switch jack (3) or jack

(4).

Remove circuit 28 plug (5) from FUEL TANK switch

jack (6).

Measure resistance between exposed jack pins on

FUEL TANK switch (7).

Does multimeter read O ohms?

1. Repair rear main harness circuit 29,30, 30A, or 31A

(page 14-3).

2. Verify no faults found.

1. Install plug on fuel tank

transmitter.

2. Replace FUEL TANK switch

(page 11-7).

3. Verify no faults found.

Change 2 3-139
TM 9-2350-261-20-1

HIGH BEAM INDICATOR LIGHT MALFUNCTION S

INITIAL SETU P

Tools:

General Mechanics

Digital Multimeter

Jumper Wire

Personnel Required:

Unit Mechanic

References:

Tool Kit (Item 30, App D) See your -10

(Item 43, App D)

Equipment Conditions:

Engine

Carrier

stopped/shutdown

blocked (see your

MASTER SWITCH OFF

(see your -10)

-10)

(see your –10)

1. Check service and IR headlights (see your –10). 1. Go to service headlights do

2. Do all lights operate properly? not operate (page 3–78), or

1.

2.

3.

Remove headlight high beam indicator light cover

lens (1), gasket (2), bulb (3), and gasket (4).

Measure resistance between bulb center contact (5)

and bulb base (6).

Did multimeter read 0-5 ohms?

1. Replace headlight high beam indicator bulb

(page 11-5).

2. Verify no faults found.

infrared headlights do not

operate (page 3–83 ).

2. Verify no faults found.

3-140
TM 9-2350-261-20-1

1. Remove circuit 519/519A lead (1) from high beam

indicator light assembly.

2. Measure resistance between each terminal (2), (3),

and ground.

3. Does meter read less than infinity?

YES

1. Replace high beam indicator light assembly

(page 11-5).

2. Verify no faults found.

GO TO NEXT PAGE

3-141

.
TM 9-2350-261-20-1

1.

2.

3.

4.

Remove power plant access cover (page 24-24).

Remove front main harness plug (1) from dimmer

switch jack (2).

Measure resistance between dimmer switch jack (2)

pins D (3) and B (4) and between pins F (5) and

H (6).

Did multimeter read 0 ohms for both

measurements?

1.

2.

3.

Install jumper wire between front main harness

dimmer switch plug (1) pins D (2) and H (3).

Measure resistance between pins on plug (4).

Does multimeter read 0 ohms?

1. Replace high beam indicator light assembly

(page 11-5).

2. Verify no faults found.

1. Replace dimmer switch

(page 12-77).

 2. Verify no faults found.

1. Repair front main harness

circuits 519 or 519A

(page 14-3).

2. Verify no faults found.

3-142
TM 9-2350-261-20-1

BATTERY/GENERATOR INDICATOR MALFUNCTION S

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D) STE/ICE-R battery troubleshooting

STE/ICE-R Test Kit (Item 71.1, App D) (page 3-266)

Personnel Required: Equipment Conditions:

Unit Mechanic Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

1. Remove instrument panel for access (page 11-2).

2. Remove circuit 27E plug (1) from battery generator

indicator jack (2).

3. Remove circuit 10 plug (3) from instrument panel

circuit breaker jack (4).

4. Measure resistance between circuit 27E plug (1) and

circuit 10 plug (3).

5. Does multimeter read 0 ohms?

2. Verify no faults found.

1. Replace BATTERY/GENERATOR indicator

(page 11-5).

 1. Repair master power

harness circuit 27E

(page 14-3).

2. Verify no faults found.

Change 1 3-143
TM 9-2350-261-20-1

COOLANT TEMPERATURE INDICATOR MALFUNCTIONS

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Jumper Wire

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Driver's power plant access panels removed

(see your -10)

Power plant rear access panel removed

(see your -10)

1. Remove engine harness circuit 33 plug (1) from

water temperature transmitter jack (2).

2. Turn MASTER SWITCH to ON (see your -10).

3. Is TEMP indicator needle in full left (cold) position?

1. Turn MASTER SWITCH to OFF.

2. Install jumper wire between engine harness circuit

33 plug and ground.

3. Observe TEMP indicator needle.

4. Turn MASTER SWITCH to ON for two seconds.

5. Did TEMP indicator needle move to full right (hot)

position?

GO TO PAGE 3-146

1. Remove jumper wire,

2. Replace water temperature switch (page 15-3).

3. Verify no faults found.

3-144 Change 4
TM 9-2350-261-20-1

1. Tum MASTER SWITCH to OFF.

2. Remove engine harness plug (1) from front main

harness jack (2) at earner bulkhead.

3. Tum MASTER SWITCH to ON.

4. Is TEMP indicator still not in full left (cold)

YES

1. Turn MASTER SWITCH to OFF.

2. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

3. Remove front main harness circuit 33 plug (1) from

TEMP indicator jack (2).

4. Measure resistance between front main harness

circuit 33 plug (1) and ground.

5. Does multimeter read infinity?

YES

1. Install engine harness plug on front main harness

jack at carrier bulkhead.

2. Install engine harness circuit 33 plug on TEMP

transmitter jack.

3. Replace TEMP indicator (page 11-11).

4. Verify no faults found.

1. Repair engine harness

circuit 33 (page 14-3).

 2. Verify no faults found.

1. Repair front main harness

circuit 33 (page 14-3).

2. Verify no faults found. I

3-145

 position ?
TM 9-2350-261-20-1

1. Remove instrument panel for access. See task:

Remove instrument panel mounts and ground leads

(page 11-2).

2. Remove circuit 27B plug (1) from coolant temperature indicator (2).

3. Turn MASTER SWITCH to ON.

4. Measure voltage between circuit 27B plug (1) pin

and ground.

5. Does multimeter read at least 17 volts?

I

YES

1. Turn MASTER SWITCH to OFF.

2. Remove engine harness plug (1) from front main

harness jack (2) at carrier bulkhead.

1. Repair faulty special purpose cable circuit 27B

I

(page 14-9).

Z. Verify no faults found.

1. Repair engine harness

circuit 33 (page 14-3).

2. Verify no faults found.

3-146

3. Measure resistance between engine harness plug (1)

 pin E (3) and ground.

4. Does multimeter read 0 ohms?
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

6.

7.

Remove jumper wire.

Install engine harness circuit 33 plug on water

temperature transmitter.

Install jumper wire between front main harness

jack (1) pin E (2) and ground (at bulkhead).

Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

Remove front main harness circuit 33 plug (3) from

TEMP indicator jack (4).

Measure resistance between front main harness

circuit 33 (3) and ground.

Does multimeter read 0 ohms?

1. Remove jumper wire.

2. Install engine harness plug onto front main harness

jack at carrier bulkhead.

3. Replace TEMP indicator (page 11-11).

4. Verify no faults found.

1. Remove jumper wire.

2. Repair front main harness

circuit 33 (page 14-3).

3. Verify no faults found. I

3-147
TM 9-2350-261-20-1

ENGINE OIL LOW PRESSURE INDICATOR MALFUNCTION S

INITIAL SETUP

Tool: Referenence:

General Mechanics Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D)

Jumper Wire Equipment Conditions:

Engine stopped/shutdown (see your -10)

Personnel Required: Carrier blocked (see your -10)

Unit Mechanic Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

1. Remove engine harness circuit 34 plug (1) from

engine oil low pressure transmitter (2).

2. Turn MASTER SWITCH to ON (see your -10).

3. Is ENGINE OIL LOW PRESSURE indicator off?

1. Install jumper wire between engine harness circuit

34 plug pin and ground.

2. Is ENGINE OIL LOW PRESSURE indicator on?

I

1. Replace engine oil low pressure switch (page 15-2).

2. Verify no faults found. I

GO TO PAGE 3-150

3-148 
1. Remove engine harness plug (1) from front main

harness jack (2) at carrier bulkhead.

2. Is ENGINE OIL LOW PRESSURE indicator still

on?

YES

1. Remove ENGINE OIL LOW PRESSURE indicator

cover lens (1) gasket (2), bulb (3), and gasket (4).

2. Remove front main harness circuit 27J/34 plug (5)

from ENGINE OIL LOW PRESSURE indicator

jack (6).

3. Measure resistance between indicator jack (6) pins

and ground, one at a time.

4. Did multimeter read less than infinity for either

measurement?

I

1. Replace ENGINE OIL LOW PRESSURE indicator

light assembly (page 11-22).

2. Verify no faults found. I

1. Repair front main harness

circuit 34 (page 14-3).

2. Verify no faults found.

3-149

1. Repair engine harness 

 circuit 34 (page 14-3) .

2. Verify no faults found. 

TM 9-2350-261-20-1
TM 9-2350-261-20-1

1.

2.

3.

Remove ENGINE OIL LOW PRESSURE indicator

cover lens (1), gasket (2), bulb (3), and gasket (4)

from indicator assembly (5).

Measure resistance between bulb center contact (6)

and bulb base (7).

Does multimeter read 0–5 ohms?

1. Measure voltage between indicator assembly (1)

center contact and ground.

2. Does multimeter read less than 17 volts?

1. Replace ENGINE OIL

LOW PRESSURE bulb

(page 11-22).

2. Verify no faults found.

3-150

GO TO PAGE 3-152
TM 9-2350-261-20-1

1. Remove front main harness circuit 27J/34 plug (1)

from ENGINE OIL LOW PRESSURE indicator

assembly jack (2).

2. Measure voltage between circuit 27J plug pin and

ground.

3. Does multimeter read less than 17 volts?

YES

1. Remove instrument panel for access (page 11-2).

2. Remove front main harness circuit 27F plug (1)

from instrument panel cable assembly circuit 27F

jack (2).

3. Measure resistance between front main harness

circuit 27J plug and circuit 27F plug (1).

4. Does multimeter read 0 ohms?

1. Replace ENGINE OIL

LOW PRESSURE indicator I

1. Repair instrument panel cable assembly circuit 27F

(page 14-9).

2. Verify no faults found.

I

assembly (page 11-22).

2. Verify no faults found. I

1. Repair front main harness

circuit 27F/27J

(page 14-3).

2. Verify no faults found.

\ -------

3-151
TM 9-2350-261-20-1

1, Remove front main harness circuit 27J/34 plug (1)

from ENGINE OIL LOW PRESSURE indicator

assembly jack (2).

2. Measure resistance between circuit 34 plug pin and

ground.

3. Does multimeter read more than O ohms?

YES

1. Remove engine harness plug (1) from front main

harness jack (2) at carrier bulkhead.

2. Measure resistance between engine harness plug (1)

pin D (3) and ground.

I

1. Install front main harness

plug on ENGINE OIL

LOW PRESSURE indicator

jack.

2. Remove jumper wire.

3. Replace engine oil low

pressure switch

(page 15-2).

4. Verify no faults found.

1. Remove jumper wire.

2. Install front main harness

plug on ENGINE OIL

LOW PRESSURE indicator

assembly jack.

3. Install indicator cover lens

and bulb.

4. Repair engine harness

circuit 34 (page 14-3).

5. Verify no faults found.

3-152

1. Remove jumper wire.

2. Install engine harness onto ENGINE OIL LOW

PRESSURE switch.

3. Repair front main harness circuit 34 (page 14-3).

4. Verify no faults found.

 3. Does multimeter read 0 ohms
TM 9-2350-261-20-1

TRANSMISSION OIL HI TEMP INDICATOR MALFUNCTIONS

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Jumper Wire

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Engine and transmission cooled down

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Driver’s power plant access panel removed

(see your -10)

Power plant rear access panels removed

(see your -10)

1. Remove TRANS OIL HI TEMP indicator cover lens

(1), gasket (2), bulb (3), and gasket (4.

2. Measure resistance between bulb center contact (5)

and bulb base (6).

3. Does multimeter read 0-5 ohms?

1. Replace TRANS OIL HI

TEMP indicator bulb

(page 11-22).

2. Verify no faults found.

GO TO NEXT PAGE

3-153
TM 9-2350-261-20-1

1. Install TRANS OIL HI TEMP indicator cover lens

bulb and gaskets.

2. Remove engine harness circuit 327 plug (1) from

trans oil hi temp switch (2).

3. Turn MASTER SWITCH to ON (see your -10).

4. Is TRANS OIL HI TEMP indicator off?

1. Install jumper wire between engine harness circuit

327 plug and ground.

2. Is TRANS OIL Hl TEMP indicator on?

I

1. Remove jumper wire.

2. Replace trans oil hi temp switch (page 15-6).

3. Verify no faults found. I

3-154

 GO TO PAGE 3-156
TM 9-2350-261-20-1

1. Remove engine harness plug (1) from front main

harness jack (2) at earner bulkhead.

2. Is TRANS OIL HI TEMP indicator still on?

YES

1. Remove front main harness circuit 327/27G

plug (1) from TRANS OIL HI TEMP indicator (2).

2. Measure resistance between front main harness

circuit 327/27G plug (1) circuit 327 pin and

ground.

8. Does multimeter read 0 ohms?

1

1. Repair engine harness

(page 14-3).

2. Verify no faults found.

1. Replace TRANS OIL HI

TEMP indicator assembly

(page 11-22).

2. Verify no faults found.

1. Shorted front main harness circuit 327.

2. Notify your supervisor.

3-155
TM 9-2350-261-20-1

1. Remove TRANS OIL HI TEMP indicator cover

lens, gasket, bulb, and gasket. GO TO PAGE 3-158

2. Measure voltage between indicator assembly center

contact and ground.

3. Does multimeter read less than 17 volts?

1. Remove jumper wire and install engine harness

circuit 327 plug on trans oil hi temp switch.

2. Remove front main harness circuit 327/27G

plug (1) from TRA.NS OIL HI TEMP indicator

assembly jack (2).

3. Measure voltage between front main harness circuit

327/27G plug (1) circuit 27G pin and ground.

4. Does multimeter read less than 17 volts?

1. Replace TRANS OIL HI

TEMP indicator assembly

(page 11-22).

2. Verify no faults found.

3-156
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to OFF.

2. Remove instrument panel for access (page 11-2).

3. Remove front main harness circuit 27F plug (1)

from instrument panel cable assembly circuit 27F

jack (2).

4. Measure resistance between front main harness

circuit 27F plug (1) and circuit 27G pin on circuit

327/27G plug.

5. Does multimeter read 0 ohms?

YES

1. Install front main harness circuit 327/27G plug on

TRANS OIL HI TEMP indicator jack.

2. Repair instrument panel cable assembly circuit 27F

(page 14-9).

3. Verify no faults.

1. Repair front main harness

circuit 27G/27F

I

(page 14-3).

2. Verify no faults found

3-157
TM 9-2350-261-20-1

1.

2.

3.

4.

Turn MASTER SWITCH to OFF.

Remove front main harness circuit 327/27G

plug (1) from TRANS OIL HI TEMP assembly

jack (2).

Measure resistance between front main harness

circuit 327/27G (1) circuit 327 pin and ground.

Does multimeter read more than 0 ohms?

1. Install TRANS OIL HI TEMP indicator cover lens,

gasket, bulb, and gasket.

2. Remove engine harness plug (1) from front main

harness jack (2) at earner bulkhead.

3. Measure resistance between engine harness plug (1)

pin G (3) and ground.

4. Does multimeter read more than O ohms?

1. Install front main harness circuit 327/27G plug on

trans oil hi temp indicator.

2. Repair engine harness circuit 327 (page 14-3).

3. Verify no faults found.

1. Remove jumper cable and

install circuit 327 plug on

trans oil hi temp switch.

2. Replace TRANS OIL HI

TEMP indicator assembly

(page 11-22).

3. Verify no faults found.

1. Remove jumper wire and

install engine harness

circuit 327 plug on trans

oil hi temp switch.

2. Repair front main harness

circuit 327 (page 14-3).

3. Verify no faults found.

3-158
TM 9-2350-261-20-1

DIFFERENTIAL OIL HI TEMP INDICATOR MALFUNCTION S

INITIAL SETUP

Tools:

General Mechanics

Digital Multimeter

Equipment Conditions:

Tool Kit (Item 30, App D) Engine stopped/shutdown (see your -10)

(Item 43, App D) Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Personnel Required: Power plant front access

Unit Mechanic (see your -10)

References:

See your -10

door open

1.

2.

3.

Remove DIFF OIL HI TEMP indicator cover lens

(1), gasket (2), bulb (3), and gasket (4).

Measure resistance between bulb center contact (5)

and bulb base (6).

Does multimeter read 0-5 ohms?

1. Replace DIFF OIL HI

TEMP bulb (page 11-22).

2. Verify no faults found.

GO TO NEX T PAGE

3-15 9
1. Install indicator buIb, gaskets, and lens.

2. Remove engine harness circuit 328 plug (1) from

differential high oil temp switch (2).

3. Tum MASTER SWITCH to ON (see your -10).

4. Is DIFF OIL HI TEMP indicator off?

l

1. Install a jumper wire between engine harness

circuit 328 plug pin and ground. GO TO PAGE 3-162

2. Is DIFF OIL HI TEMP light ON?

I

1. Replace differential high oil temp switch

2. Verify no faults found.

3-160

TM 9-2350-261-20-1

(page 15-4)
TM 9-2350-261-20-1

1. Remove engine harness plug (1) from front main

harness jack (2) at carrier bulkhead.

2. Is the DIFF OIL HI TEMP indicator still ON?

YES

1. Turn MASTER SWITCH to OFF.

2. Remove front main harness circuit 328/27K plug

(1) from DIFF OIL HI TEMP jack (2).

3. Measure resistance between indicator jack (2) pins

and ground one at a time.

4. Did multimeter read 0 ohms for either measurement?

YES

1. Install engine harness plug on front main harness

jack at carrier bulkhead.

2. Replace DIFF OIL HI TEMP indicator light

assembly (page 11-22).

3. Verify no faults found.

1. Repair engine harness

circuit 328 (page 14-3).

2. Verify no faults found.

1. Repair front main harness

circuit 328/27K

(page 14-3).

2. Verify no faults found.

3-161
TM 9-2350-261-20-1

1.

2.

3.

Remove DIFF OIL HI TEMP indicator cover lens

(1), gasket (2), bulb (3) and gasket (4) from

indicator assembly.

Measure voltage between indicator center contact

and ground.

Does multimeter read less than 17 volts?

1.

2.

3.

Remove front main harness circuit 328/27K plug

(1) from DIFF OIL HI TEMP indicator jack (2).

Measure voltage between circuit 27K pin and plug

on ground.

Does multimeter read less than 17 volts?

1. Do any of the other indicators on the warning light

panel operate normally?

I

1. Repair front main harness circuit 27K (page 14-3).

2. Verify no faults found.

3-162

1. Replace DIFF OIL HI

TEMP indicator assembly

(page 11-22).

2. Verify no faults found.

1. Repair instrument panel

harness circuit 27F

(page 14-3).

2. Verify no faults found.
TM 9-2350-261-20-1

1. Turn MASTER POWER SWITCH to OFF.

2. Remove circuit 328/27K plug (1) from DIFF OIL

HI TEMP indicator (2).

3. Measure resistance between circuit 328 and ground.

4. Does multimeter mad more than 0 ohms?

YES

1. Remove engine harness plug (1) from front main

harness jack (2) at bulkhead.

2. Measure resistance between engine harness plug (1)

1. Remove jumper wire.

2. Install plug on DIFF OIL HI TEMP indicator

assembly.

3. Repair front main harness circuit 328 (page 14-3).

4. Verify no faults found.

1. Remove jumper wire.

2. Install plug on differential

high oil temp switch in

engine compartment.

3. Replace differential high oil

temp indicator assembly

(page 11-22).

4. Verify no faults found.

1. Remove jumper wire.

2. Install plug on differential

high oil temp switch in

engine compartment.

3. Install indicator bulb,

gaskets, and lens.

4. Repair engine harness

circuit 328 (page 14-3).

5. Verify no faults found.

pin A (3) and ground.

3. Does multimeter read 0 ohms?

3-163 
TM 9-2350-261-20-1

SUSPENSION LOCKOUT INDICATOR MALFUNCTION S

(M741A1 ONLY)

INITIAL SETUP

Tools:

General Mechanics

Digital Multimeter

Jumper Wire

Personnel Required:

Unit Mechanic

References:

See your -10

Tool Kit (Item 30, App D)

(Item 43, App D)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Driver’s power plant access panel removed

(see your -10)

Power plant rear

(see your -10)

access panels removed

1.

2.

3.

Remove SUSPENSION LOCKOUT indicator cover

lens (l), gasket (2), bulb (3) and gasket (4).

Measure resistance between bulb center contact (5)

and bulb base (6).

Does multimeter read 0-5 ohms?

1. Replace SUSPENSION

LOCKOUT indicator bulb

I

(page 11-22).

2. Verify no faults found.

3-164 
TM 9-2350-261-20-1

1. Install SUSPENSION LOCKOUT indicator cover

lens, bulb, and gaskets.

2. Remove special purpose cable circuit 509 plug (1)

from suspension lockout pressure switch (2).

3. Turn MASTER SWITCH to ON.

4. Is SUSPENSION LOCKOUT indicator off?

GO TO NEXT PAGE

1. Install a jumper wire between special purpose cable

circuit 509 and ground. GO TO PAGE 3-167

2. Is SUSPENSION LOCKOUT indicator ON?

1. Turn MASTER SWITCH to OFF.

2. Remove jumper wire.

3. Replace SUSPENSION LOCKOUT indicator

pressure switch. (page 29-60).

4. Verify no faults found.

3-165
TM 9-2350-261-20-1

1. Remove special purpose cable plug (1) from jack (2)

at carrier bulkhead.

2. Is SUSPENSION LOCKOUT indicator still ON?

YES

1. Remove lead assembly 27H/509 plug (1) from SUSPENSION LOCKOUT indicator (2).

2. Measure resistance between lead assembly 27H/509

plug (1) circuit 509 and ground.

3. Does multimeter read 0 ohms?

1. Turn MASTER SWITCH

to OFF.

2. Repair special purpose

cable (page 14-9).

3. Verify no faults found.

1. Replace SUSPENSION

LOCKOUT indicator I

assembly .(page 11-22).

2. Verify no faults found.

1. Repair lead assembly 11616349 from indicator to

bulkhead connector (page 14-3).

2. Verify no faults found.

3-166
TM 9-2350-261-20-1

1. Remove SUSPENSION LOCKOUT indicator cover

lens, gasket, buIb and gasket.

2. Measure voltage between indicator assembly center

contact and ground.

3. Does multimeter read less than 17 volts?

YES

1. Turn MASTER SWITCH to OFF.

2. Install SUSPENSION LOCKOUT indicator cover

lens, bulb, and gaskets.

3. Remove jumper wire.

4. Install special purpose cable circuit 509 plug on

suspension lockout pressure switch.

5. Repair lead assembly 11616349 circuit 27H

(page 14-3).

6. Verify no faults found.

1. Remove jumper wire.

2. Install special purpose

cable circuit 509 plug on

suspension lockout pressure

switch.

3. Replace SUSPENSION

LOCKOUT indicator

assembly (page 11-22).

4. Verify no faults found.

3-167
TM 9-2350-261-20-1

TURRET POWER/PROXIMITY SWITCH TROUBLESHOOTIN G

(M741A1 ONLY)

INITIAL SETUP

Tools: Equipment Conditions:

General Mechanics Tool Kit (Item 30, App D) Engine stopped/shudown (see your -10)

Digital Multimeter (Item 43, App D) Carrier blocked (see your -10)

Driver and cargo hatches closed Personnel Required: (see Your -10)

Unit Mechanic Rear compartment floor plates removed

(page 24-40)

References:

See your -10

1. Turn MASTER SWITCH to ON (see your -10).

2. Turn TURRET POWER to ON (see your -10). GO TO PAGE 3-170

3. Does turret power come on?

1. Move MASTER SWITCH to OFF.

2. Remove wiring harness plug (1) from slip ring jack

A14J1.

3. Measure resistance on terminal board TB1 (2) between terminals 1 (3) and 4 (4). Reed measurement.

4. Open commander’s hatch door and repeat

measurement.

5. Does multimeter read 0 ohms with hatch closed and

infinity with hatch open?

3-168

1. Replace commanders hatch

interlock switch

(page 17-22).

2. Verify no faults found.
TM 9-2350-261-20-1

1. Measure resistance on terminal board TB2 (1) between terminals 3 (2) and 4 (3). Record measurement.

2. Open drivers hatch and repeat measurement.

3. Does multimeter read 0 ohms with hatch closed and

infinity with hatch open?

YES

1. Install a jumper wire on terminal board TB1 (1)

between terminals 2 (2) and 4 (3).

2. Measure resistance between wiring harness

11677930 plug (4) pin K (5) and S (6).

3. Does multimeter read 0 ohms?

1. Replace driver’s hatch interlock switch

I

(page 17-19).

2. Verify no faults found.

1. Repair/replace wiring

harness 11677930

I

(page 14-3).

2. Verify no faults found.

I

1. Hull wiring and switches are OK.

2. Faulty turret wiring. Notify your supervisor. I

3-169 
TM 9-2350-261-20-1

1. Remove wiring harness 11677930 plug (1) from

slipring jack A14J1.

2. Measure voltage between wiring harness plug (1)

pin k (2) and ground.

3. Does multimeter read less than 17 volts?

1. Remove six nuts (1) washers (2) screws (3), cover

(4) and gasket (5) from turret distribution box (6).

2. Measure voltage between bus bar (7) and ground.

3. Does multimeter read less than 17 volts?

1. Faulty turret wiring.

Notify your supervisor.

1. Replace diode semiconductor device assembly

(page 17-27).

2. Verify no faults found.

 1. Go to charging system malfunctions (page 3-55).

3-170 
3-171
3-172
TM 9-2350-261-20-1

TURRET POWER/PROXIMITY SWITCH SYSTEM SCHEMATIC (M741 A1 ONLY)

3-173
3-174
3-175
TM 9-2350-261-20-1

STEERING/BRAKES MALFUNCTION

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power Plant access door open (see your -10)

1. Has steering brake linkage adjustment procedure been

performed?

1. Adjust steering brake

linkage (page 23-2).

2. Verify no faults found.

1. Have differential brakes been adjusted? 1. Adjust differential brakes

(page 21-18).

2. Verify no faults found.

1. Inspect carrier suspension and tracks (see your -10).

2. Are suspension and tracks free from damage and

1. Repair and/or adjust carrier

adjusted properly?

suspension (chapter 22).

2. Verify no faults found.

1. Faulty differential.

2. Notify your supervisor.

3-176 Change 4

TM 9-2350-261-20-1

1. Has range selector linkage been adjusted?

1. Have differential brakes been adjusted?

1. Faulty drive train.

2. Notify your supervisor.

1. Adjust range selector linkage (page 23-55).

2. Verify no faults found.

3-178

1. Adjust differential brakes 

 (page 21-18). 

2. Verify no faults found. 
TM 9-2350-261-20-1

CARRIER DOES NOT PIVO T

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Personal Required:

Unit Mechanic

Helper (H)

Reference:

See your -10

Reference (cont):

See your LO

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant access door open (see your -10)

1. Inspect pivot steer brakes, hoses, tubes, brake

discs, and fittings for leaks or serviceability (see

Chapter 23).

2. Are all parts serviceable?

1. Inspect master cylinder (1) for leaks.

2. Is master cylinder serviceable?

1. Replace damaged parts as

required (page 23-62).

2. Verify no faults found.

1. Replace master cylinder

(page 23-66).

2. Verify no faults found. I

\

l

1. Check hydraulic fluid level (see your LO). 1. Bleed pivot steer system

2. Is master cylinder full? (page 23-61).

2. Verify no faults found.

GO TO NEXT PAGE

3-179
TM 9-2350-261-20-1

1. Has pivot steer linkage been adjusted? 1. Adjust pivot steer linkage — (page 23-72).

2. Verify no faults found.

1. Remove quick disconnect coupling (1 or 2) from left

or right caliper (3 or 4).

2. Pull left or right pivot steer handle and hold.

Handle should stop about half way and not bleed

off or feel spongy.

3. Does handle stop firmly and hold?

NO 1. Replace master cylinder

(page 23-66).

2. Verify no faults found.

1. Inspect pivot steer brake linings for wear

(page 23-68).

1. Replace pivot steer brake

linings (page 23-68).

2. Are brake linings serviceable? 2. Verify no faults found.

I

1. Faulty differential.

2. Notify your supervisor. I

3-18 0
3-181
TM 9-2350-261-20-1

RAMP WILL NOT LOWE R

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Personnel Required:

Unit Mechanic

Helper (H)

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Driver’s power plant access panel removed

(see your -10)

Power plant rear access

(see your -10)

Rear compartment floor

(page 24-36)

panels removed

plates removed

WARNIN G

Lowering ramp could injure

soldiers. Make sure no one

is in ramp zone before you

lower ramp. If tactical situation permits, sound horn

before dropping ramp.

1. Release ramp (see your -10).

2. Observe ramp latches (1).

3. Do ramp latches (1) release ramp?

1. Repair, replace and/or

adjust ramp latches and/or

linkage (page 25-1).

2. Verify no faults found.

3-18 2
TM 9-2350-261-20-1

1. Inspect ramp hydraulic cylinder wire rope (1) and

pulleys (2).

2. Are wire rope and pulleys in good condition?

YES

1. Inspect hydraulic cylinder (1)

2. Is hydraulic cylinder free of bends and dents that

could restrict its movement?

YES

1. Inspect hydraulic lines and quick disconnect couplings between fluid tank and hydraulic cylinder.

2. Are any lines damaged? Are all quick disconnect

couplings fully connected?

t 1

1. Connect couplings.

2. Repair lines as necessary (page 28-1).

3. Verify no faults found.

1. Replace wire rope and/or

Pulleys

(page 25-30 or 25-31).

2. Verify no faults found

1. Replace hydraulic cylinder

(page 28-93).

2. Verify no faults found

3-183

1. Replaced control valve

 (page 28-84 or 28-87).

2. Verify no faults found.
TM 9-2350-261-20-1

RAMP OPERATION IS SLOW OR SLUGGIS H

INITIAL SETUP

Tools: Equipment Conditions:

General Mechanics Tool Kit (Item 30, App D) Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Personnel Required: Ramp lowered (see your -10)

Unit Mechanic Power plant rear access panels removed

(see your -10)

References:

see your -10

1. Remove hydraulic tank fluid strainer (page 28-15). 1. Clean strainer (page

2. Is strainer clean? 28-15).

2. Verify no faults found.

1. Install strainer (page 28-15). 1. Service or replace hydraulic

2. Remove tank breather (page 28-20). tank breather

3. Start engine and operate ramp (see your -10). (page 28-17).

4. Is ramp still sluggish? 2. Verify no faults found.

1. Install tank breather (page 28-17). 1. Tighten fittings and/or

2. Operate ramp several times (see your -10).

3. Observe oil through sight glass (see your -10).

repair/replace tank to

4. Is hydraulic fluid free of air bubbles and foam?

pump hose (page 28-17).

2. Verify no faults found. \

1. Check quick disconnect couplings and lines for 1. Clean couplings and lines.

restrictions. 2. Verify no faults found.

2. Are couplings and lines free of restrictions?

\

I

1. Replace worn ramp pump (page 28-81).

2. Verify no faults found. I

3-184
TM 9-2350-261-20-1

RAMP WILL NOT RAISE OR FREE FALLS

INITIAL SETUP

Tools:

General Mechanics Tool Kit

Personnel Required:

Unit Mechanic

References:

See your -10

see your -12

(Item 30, App D)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Driver’s power plant access panel removed

(see your -10)

Power plant rear access panels removed

(see your -10)

Rear compartment floor plates removed

(page 24-36)

1. If ramp will not raise, check engine disconnect

lever. Ensure lever is locked in the OUT (engage)

position (see your -10).

2. Check ramp hydraulic fluid tank sight glass fluid

level (see your -10).

3. Is fluid level correct?

1. Inspect ramp wire rope (1) and/or pulleys (2).

2. Are wire rope and pulleys in good condition?

GO TO NEXT PAGE

1. Replace wire rope and/or

pulleys

(page 25-30 or 25-31).

2. VerIfy no faults found.

GO TO PAGE 3-187

3-18 5
TM 9-2350-261-20-1

1. Inspect quick-disconnect coupling fittings (1) and

(2) on control valve (3).

2. Inspect control valve (3).

3. Are fittings hooked up to control valve, and are all

parts free from damage and leaks?

1. Inspect ramp hydraulic cylinder (1) for leaks.

2. Is hydraulic cylinder free of leaks?

1. Has pressure relief valve on fluid tank been replaced ?

1 Replace parts as needed

(page 28-1).

2 Verify no faults found.

1. Replace ramp hydraulic

cylinder (page 23-93).

2. Verify no faults found.

1. Replace pressure relief

valve. See task:

Repair/replace hydraulic

tank (page 28-17).

2. Verify no faults found.

3-186 
TM 9-2350-261-20-1

1. Has hydraulic pump been replaced?

1. Replace ramp control valve (page 28-84 or 28-87).

2. Verify no faults found.

1. Check all ramp hydraulic lines for damage or loose

fittings.

2. Are all lines free of leaks?

YES

1. Refill hydraulic tank (see your -12).

2. Verfy no faults found.

1. Replace hydraulic pump

(page 28-81).

2. Verify no faults found.

1. Tighten any loose fittings

and/or replace any damaged fluid lines

(chapter 28).

2. Verify no faults found.

3-187
TM 9-2350-261-20-1

RAMP HYDRAULIC SYSTEM SCHEMATIC

3-188
TM 9-2350-261-20-1

SUSPENSION LOCKOUT DOES NOT EXTEND (M741A1 ONLY) 

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Wiping rag (Item 61, App C)

Personnel Required: 

Unit Mechanic

Helper (H)

See your -10

See your -12

Equipment Conditions: 

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

1. Raise and lower ramp (see your -10).

2. Does ramp raise normally?

YES

1. Check hydraulic reservoir fluid level (see your -12).

2. Is reservoir full?

1. Troubleshoot ramp system.

See task: Ramp operation

is slow or sluggish

(page 3-184), or Ramp will

not raise or free falls

(page 3-185).

2. Verify no faults found.

1. Semite hydraulic reservoir

(see your -12).

2. Verify no faults found.

GO TO NEXT PAGE

3-18 9
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

NOTE

Hydraulic fluid may drain from disconnected tubes and valves. Use wiping

rags.

Remove tube fitting (1) from control valve return

port (2).

Observe return port (2).

NOTE

If hydraulic fluid flows from return port

during step 3 or 4, stop engine and go to

step 5.

Start engine and let idle (see your -10).

Move control valve to EXTEND position.

Does fluid fail to flow from selector valve return

port?

1. Replace ramp control valve

(page 28-84).

2. Verify no faults found. I

3-190
1. Connect tube fitting to control valve return port.

2. Start engine and let idle (see your -10).

3. Disconnect tube fitting (1) from pressure relief

valve (2).

4. Does pressure relief valve leak hydraulic fluid?

1. Replace pressure relief valve (page 28-60).

2. Verify no faults found.

TM 9-2350-261-20-1

1. Replace unloader valve

(page 28-60).

2. Verify no faults found. I

3-191
TM 9-2350-261-20-1

SUSPENSION LOCKOUT DOES NOT HOLD (M741A1 ONLY) 

INITIAL SETUP 

Tools

General Mechanics

Materials/Parts

Wood block

References:

Tool Kit (Item 30, App D) See your -10

See your -12

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Personnel Required: Carrier blocked (see your -10)

Unit Mechanic Ramp lowered (see your -10)

Helper (H)

1. Raise and lower ramp (see your -10)

2. Does ramp raise normally?

YES

1. Check hydraulic reservoir fluid level (see your -12).

2. Is reservoir level correct?

1. Extend suspension lockout cylinders (see your -10).

2. Do all suspension lockout cylinder push rods fully

.

1. Troubleshoot ramp system:

See task: Ramp operation

is slow or sluggish

(page 3-184), or Ramp will

not raise or free falls

(page 3-185).

2. Verify no faults found.

1. Replace suspension lockout

cylinder(s) which does not

extend (page 28-72).

2. Verify no faults found.

3-19 2
TM 9-2350-261-20-1

2.

3.

4.

{

-

Disconnect plug 509 (1) from pressure switch

M9395/31 (2).

Unblock earner (see your -10).

Place a wood block in front of earner and drive

carrier over wood block slowly. Have helper observe.

Does each road arm remain in fixed position when

rolling over block?

1. Block earner (see your -10).

2. Connect plug 509 to pressure switch M9395/31.

3. Go to: Suspension lockout does not extend (page

3-289).

4. Verify no faults found.

1. Block carrier

(see your -10).

2. Replace lockout cylinder

which does not hold road

arm in fixed position

(page 28-72).

3. connect plug 509 to pressure switch M9395/31.

4. Verify no faults found.

3-193

 `1.
TM 9-2350-261-20-1

SUSPENSION LOCKOUT DOES NOT RELEASE (M741A1 ONLY) 

INITIAL SETUP 

Tools:

General Mechanics Tool Kit

Personnel Required: 

Unit Mechanic

References:

See your -10

See your -12

Equipment Conditions:

(Item 30, App D) Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Driver’s power plant access panel removed

(see your -10)

Power plant rear access panels

(see your -10)

removed

1. Raise and lower ramp (see your -10)

2. Does ramp operate normally?

YES

I

1. Check hydraulic reservoir fluid level (see your -12).

2. Is reservoir level correct?

1. Do any of the lockout cylinders retract?

1. Replace suspension lockout cylinders that do not retract (page 28-72).

2. Verify no faults found.

1. Troubleshoot ramp system:

See task: Ramp operation

is slow or sluggish

(page 3-184), or Ramp will

not raise or free falls

(page 3-185).

2. Verify no faults found.

1. Service hydraulic reservoir

(see your -12).

2. Verify no faults found.

1. Replace suspension lockout

control valve (page 28-56).

2. Verify no faults found.

3-194
TM 9-2350-261-20-1

SUSPENSION LOCKOUT SCHEMATIC

(M741A1 ONLY) I

3-195
TM 9-2350-261-20-1

SMOKE GRENADE LAUNCHER(S) MALFUNCTIO N

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Unit Mechanic

Helper (H)

Inferences

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Harness 12313235 removed from launcher

arming/firing unit

1. Does either launcher operate properly?

GO TO PAGE 3-199

I

1.

2.

3.

4.

5.

Remove harness launcher plug (1) from failing

launcher.

Remove harness circuit 7 (2) and 799 (3) plugs

from harness (right launcher) or harness (left

launcher) jacks (4).

Measure resistance between harness launcher plug

(1) pin A (5) and circuit 7 plug (2).

Measure resistance between harness launcher plug

(1) pin C (6) and circuit 799 plug (3).

Does multimeter read 0 ohms for both measurements?

1. Replace harness for left or

right grenade launcher

(page 27-3).

2. Verify no faults found.

3-196
TM 9-2350-261-20-1

1. Is failing launcher on right side of carrier?

1. Install jumper wire between circuit 7 (1) and 799

jacks (2).

2. Remove harness plug (3) from harness jack (4) at

earner bulkhead.

3. Measure resistance between harness plug (3) pins

A (5) and B (6).

4. Does multimeter read 0 ohms?

GO TO 3-200

1. Replace harness

(page 27-3).

2. Verify no faults found. I

GO TO NEXT PAGE

page 

3-197 
TM 9-2350-261-20-1

1. Install jumper wire between harness jack (1), pins

A (2) and B (3) at bulkhead.

2. Measure resistance between harness arming/firing

unit plug (4), pins E (5) and F (6).

3. Does mu.ltimeter read 0 ohms?

I

1. Faulty arming/firing unit.

2. Notify your supervisor.

1. Replace harness

(page 27-3).

2. Verify no faults found.

3-198 
TM 9-2350-261-20-1

1. Turn MASTER SWITCH to ON (see your -10).

2. Measure voltage between harness firing/arming

unit plug (1) pin A (2) and B (3).

3. Does multimeter read at least 17 volts?

1. Faulty arming/firingg unit.

2. Notify your supervisor.

1. Replace harness

(page 27-3).

2. Verify no faults found.

3-199 
TM 9-2360-261-20-1

1. Install jumper wire between harness jacks circuit 7

(1) and circuit 799 (2).

2. Measure resistance between harness arming/firing

unit plug (3) pins C (4) and D (5).

3. Does multimeter read 0 ohms?

1. Faulty arming/firing unit.

2. Notify your supervisor.

3-20 0
TM 9-2350-261-20-1

FRONT AND/OR REAR BILGE pump(s) AND/OR LIGHTS DO NOT 

OPERAT E

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required: 

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

MASTER SWITCH OFF (See your -10)

Power plant front access cover removed

(front bilge pump) (page 24-24)

Trim vane lowered and power plant front

access door open (see your -10)

Ramp lowered (rear bilge pump)

(see your -10)

Rear floor plate removed (rear bilge pump)

(page 24-37)

1. Turn MASTER SWITCH to ON (see your -10).

2. Turn BILGE PUMPS switch to ON (see your -10).

3. Do both bilge pump lights come on?

YES

1. Does either bilge pump fail to come on?

1. Locate bilge pump that is not operating

(see your -10).

2. Remove circuit 451 (rear pump) or circuit 452

(front pump) plug (1) from P UmP jack (2).

3. Measure voltage between plug 451 or 452 (1) and

ground.

4. Does multimeter read more than 17 volts?

1. Repair front main wiring

harness (front bilge pUmp)

or rear main wiring

harness (rear bilge pump)

(page 14-3).

2. Verify no faults found.

GO TO NEXT

3-201
TM 9-2350-261-20-1

1.

2.

3.

Turn MASTER SWITCH to OFF.

Measure resistance between bilge pump body (1)

and ground lead (2).

Does multimeter read 0 ohms?

1. Replace bilge pump

(page 16-2 (front) or 16-8 (rear)).

2. Verify no faults found.

1. Remove BILGE PUMPS ON indicator lens (1) and

bulb (2).

2. Measure resistance between bulb center contact (3)

and bulb base (4).

3. Does multimeter read more than 5 ohms?

1. Replace ground lead to

bilge pump

(page 16-2 or 16-8).

2. Verify no faults found.

1. Replace BILGE PUMPS

ON indicator light bulb

(page 11-5).

2. Verify no faults found.

3-202
TM 9-2350-261-20-1

1. Measure voltage between bulb socket center contact

(1) and ground (2).

2. Does multimeter read less than 17 volts?

YES

1. Turn MASTER SWITCH to OFF.

2. Remove master switch panel from distribution box

(page 9-13). Do not disconnect battery negative

lead.

3. Remove plug 450 B (1) and plug 450 C (2) from

front bilge pump circuit breaker (3) or remove plug

450 (4) and plug 450 A (5) from pump bilge PumP

circuit breaker (6).

4. Measure resistance between circuit breaker jacks.

5. Does multimeter read 0 ohms?

I

1. Replace BILGE PUMPS

ON indicator light

-

assembly (page 11-5).

2. Verify no faults found.

1. Replace bilge pump circuit

breaker (page 16-12).

 2. Verify no faults found.

GO TO NEXT PAGE

3-203
TM 9-2350-261-20-1

1. Measure resistance between plug 450 A (rear bilge

pump) (1) to 450 A lead end at bus bar (2) or

plug 450 C (front bilge pump) (3) to 450 C lead

end at bus bar (4).

2. Does multimeter read 0 ohms?

YES

1. Remove instrument panel for access. See task:

remove instrument panel mounts and ground lead

(page 11-2).

2. Remove plug 450 B (1) and plug 452 A (2) (front

bilge pump) or plug 450 (3) and 451 A (4) (rear

bilge pump) from bilge pump switch (5).

3. Measure resistance between bilge pump switch

jacks with bilge pump switch on.

4. Does multimeter read 0 ohms? 

YES

1. Repair rear main harness circuit 450 or 451A, or

front main harness circuit 450B or 452A

(page 14-3).

2. Install master switch panel on distribution box.

3. Verify no faults found.

(page 14-3). -

2. Verify no faults found.

1. Install master switch panel

on distribution box.

2. Replace bilge pump switch

(page 11-7).

3. Verify no faults found.

1. Replace circuit 450A (rear 

 bilge pump)or circuit 450C 

 (front bilge pump) lead 

3-20 4
TM 9-2350-261-20-1

1. Have bilge pumps been serviced? 1. Service bilge pump

assemblies (see your -10).

YES

2. Verify no faults found.

1. Inspect bilge pump pipes.

2. Are bilge pump pipes damaged?

1. Replace bilge pump pipes

(page 16-5 (front) 16-11 (rear)).

2. Verify no faults found.

1. Replace bilge pump

(page 16-8 (rear) or 16-2

(front)).

2. Verify no faults found.

3-205 
3-206
TM 9-2350-261-20-1

PERSONNEL HEATER MALFUNCTION S

INITIAL SETUP 

Tools:

General Mechanics

Digital Multimeter

Tool Kit (Item 30, App D)

(Item 43, App D)

Electrical Connector Pliers (Item 44, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Front access door open (see your -10)

Driver’s access panel removed (page 24-25)

Rear access panel removed (page 24-27 and

24-29)

Rear floor plates removed (page 24-37)

Ramp lowered (see your -10)

Heater on LOW (see your -10)

1. Turn MASTER SWITCH to ON (see your -10).

2. Depress HEATER ON indicator cover lens

(see your -10).

3. Does indicator light come on?

YES

1. Release HEATER ON indicator.

2. Move HEATER SWITCH to START.

3. Does heater blower come on?

1. Does heater fuel pump come on?

1. Does HEATER ON indicator come on in less than

3 minutes?

T O

T O

TO

T O

PAGE

PAGE

PAGE

PAGE

3-209

3-211

3-212

3-213

1. Turn HEATER SWITCH to ON. Do not stop at 1. Replace heater

OFF position. ON/OFF/START switch.

2. Do blower and pump stay ON? I

I

See task: Repair heater

control box (page 29-42).

2.. Verify no faults found.

GO TO NEXT PAGE

3-207
3-208

TM 9-2350-261-20-1

1. Does heater continue producing hot air for 10 min- 1. Heater shuts off premautes? turely. \

2. Notify your supervisor.

1. Listen to heater blower.

2. Turn HI/LO switch to HI.

3. Does blower sqeed increase?

3-216

YES

1. Feel heater hot air outlet. 1. Shut off heater

2. Has air temperature increased? (see your -10).

I

2. Faulty heater restrictor

I

YES

solenoid.

3. Notify your supervisor.

1. Run heater on HI for 10 minutes.

NOTE

Heater will shut off prematurely if air

inlet temperature is 60 degrees or above.

This is normal.

2. Does heater continue producing hot air?

1. Shut off heater

(see your -10).

2. Insuflicient heater

operation.

3. Notify your supervisor.

1. Turn HEATER SWITCH to OFF. 1. Heater does not purge.

2. Does blower remain on? 2. Notify your supervisor.

1. Listen to heater until blower shuts off.

2. Does blower shut off in less than 5 minutes?

1. Heater is operating properly.

2. No faults found.

1. Faulty heater flame

detector switch.

2. Notify your supervisor.
TM 9-2350-261-20-1

1.

2.

3.

Remove heater indicator cover lens (1) and bulb (2).

Measure resistance between bulb center contact and

base.

Does multimeter read 0-5 ohms?

1. Remove rear main harness circuit 400 plug (1)

from control box jack (2).

2. Measure voltage between rear main harness circuit

400 plug (1) pin and ground.

3. Does multimeter read 17 volts or more?

GO TO NEXT PAGE

1. Replace heater bulb

(page 29-42).

 2. Verify no faults found.

1. Repair rear main harness

circuit 400 between master

switch and heater control

box (page 14-3).

2. Verify no faults found.

3-209
TM 9-2350-261-20-1

1. Remove heater control box (page 29-42).

2. Measure resistance between circuit breaker

terminals 16 (1) and 17 (2).

3. Does multimeter read 0 ohms?

YES

1. Measure resistance between lead ends from circuit

breaker terminal 17 (1) to indicator light terminal

3 (2).

2. Does multimeter read 0 ohms?

1. Replace heater circuit

breaker (page 29-44).

2. Verify no faults found.

1. Repair/replace faulty lead

(page 14-3).

2. Verify no faults found.

1. Replace indicator light assembly (page 29-44).

2. Verify no faults found.

3-21 0
TM 9-2350-261-20-1

1. Remove heater harness plug (1) from heater control

box jack (2).

2. Measure voltage between heater control box jack (2)

pin C (3) and ground with heater switch on start.

3. Does multimeter read 17 volts or more?

.

YES

1. Install heater harness plug on heater control box

jack.

2. Remove heater harness plug (1) from heater

jack (2).

3. Measure voltage between heat= harness plug (1)

pin C (3) and ground with heater switch on start.

4. Does multimeter read 17 volts or more?

1. Faulty Personnel Heater.

2. Notify your supervisor.

1. Faulty heater wiring

harness. I

2. Notify your supervisor.

GO TO NEXT PAGE

3-21 1
TM 9-2350-261-20-1

1.

2.

3.

Remove heater control box (page 29-42).

Measure resistance between lead ends from circuit

breaker terminal 17 (1) and ON/OFF/STA.RT

switch terminal 15 (2).

Does multimeter read 0 ohms?

1. Measure resistance between lead ends from

ON/OFF/START switch terminals 21 (1) and

14 (2).

2. Does multimeter read 0 ohms?

1. Replace heater ON/OFF/START switch

(page 29-43).

2. Verify no faults found.

1. Repair faulty lead

(page 14-3).

2. Verify no faults found.

1. Repair heater switch jumper lead between terminal

21 and 14 (page 14-3).

2. Verify no faults found.

3-212

.
TM 9-2350-261-20-1

1. Remove heater harness plug (1) from heater control

jack (2).

2. Measure voltage between heater control jack (2) pin

A (3) and ground. With HEATER switch on

START.

3. Does multimeter read 17 volts or more?

. .

.

YES

1. Install heater harness on heater control box jack.

2. Remove heater harness circuit 402 plug (1) from

heater fuel pump jack (2).

3. Measure voltage between heater harness plug pin

(1) and ground. With HEATER switch on START.

4. Does multirneter read 17 volts or more?

1. Replace personnel heater fuel pump

(page 29-8, 29-11, or 29-13).

2. Verify no faults found.

GO TO NEXT PAGE

1. Faulty control box to

heater harness circuit 402.

2. Notify your supervisor.

3-213 
TM 92350-261-20-1

1. Remove heater control box (page 29-42).

2. Measure resistance between lead ends of heater

output jack (1) pin A (2) and ON/OFF/START

switch terminal 14 (3).

3. Does multimeter read 0 ohms?

I

1. Replace heater ON/OFF/START switch

(page 29-43).

2. Verify no faults found.

1. Is heater exhaust cold?

1. Replace faulty lead

(page 14-3).

2. Verify no faults found. I

1. Defective flame detector

switch.

2. Notify your supervisor.

3-214
TM 9-2350-261-20-1

1. Loosen fuel inlet line (1) to heater with heater

switch on start.

2. Does fuel fail to flow out of loosened fitting?

YES

1. Inspect fuel lines between fuel tank (1) and

heater (2).

2. are all lines free from kinks, restrictions, or other

damage?

.

.

1. Replace personnel heater fuel pump

(page 29-8, 29-11, or 29-13).

2. Verify no faults found.

1. Heater does not start.

2. Notify your supervisor.

1. Replace heater fuel lines as

required (Chapter 29).

2. Verify no faults found.

3-21 5
TM 9-2350-261-20-1

1.

2.

3.

Remove heater control box (page 29-42).

Measure resistance between HI/LO switch terminals 12 (1) and 13 (2).

Does multimeter read 0 ohms?

1. Repair lead between heater switch and jack or

heater switch and ON/OFF/START switch

(page 14-3).

2. Verify no faults found.

1. Replace heater HI/LO

switch (page 29-43).

2. Verify no faults found.

3-216
TM 9-2350-261-20-1

COOLANT HEATER MALFUNCTIONS 

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Electrical Connector Pliers (Item 44, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Equipment Conditions (cent):

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Ramp lowered (see your -10)

Driver’s power plant access panel removed

(see Your -10)

Power- plant rear access panels removed

(see your -10)

Heater on

Rear floor

Engine cold

HI (see your -10)

plates removed (page 24-37)

.

1. Depress HEATER ON indicator cover lens

(see Your -10).

2. Does-indicator light come on?

I

1. Release HEATER ON indicator.

2. Move HEATER SWITCH to START.

3. Does heater blower come on?

1. Does heater fuel pump come on?

1. Does coolant circulating pump come on?

1. Does HEATER ON indicator come on in less than

3 minutes?

GO TO NEXT PAGE

PAGE

PAGE

PAGE

PAGE

3-220

3-222

3-224

3-225

3-217
PAGE 3-226

TM 9-2350-261-20-1

1. Turn HEATER SWITCH to ON. Do not stop at

OFF position.

2. Does BLOWER stay ON?

YES

1. Run heater on HI for 10 minutes

2. Feel exhaust temperature. Does heater continue to

produce hot exhaust for 10 minutes?

TO PAGE 3-226

1. Has flame detector switch been adjusted?

I

1. Replace flame detector switch (page 31-4).

2. Verify no faults found. I

1. Remove indicator cover lens (1) and bulb (2).

2. Measure resistance between bulb center contact and

base.

3. Does multimeter read less than 5 ohms?

1. Adjust flame detector

switch (page 31-5).

2. Verify no faults found.

1. Replace indicator bulb

(page 32-42).

3-218

2. Verify no faults found. 
TM 9-2350-261-20-l

1.

2.

3.

Remove rear main harness circuit 400A plug (1)

from control box jack (2).

Measure voltage between rear main harness circuit

400A plug (1) pin and ground.

Does multimeter read more than 17 volts?

YES

1.

2.

3.

Remove heater control box (page

Measure resistance between lead

breaker terminals 16 (1) and 17

Does multimeter read 0 ohms?

32-42).

ends from circuit

(2).

1. Repair rear main harness

circuit 400 between master

switch and heater control

box (page 14-3).

2. Verify no faults found.

1. Replace heater circuit

breaker (page 32-42).

2. Verify no faults found.

GO TO NEXT PAGE

3-219
TM 9-2350-261-20-1

1.

2.

Measure resistance between lead ends from circuit

breaker terminal

terminal 3 (2).

Does multimeter

17 (1) to indicator light

read 0 ohms?

1. Replace indicator light assembly (page 32-42).

2. Verify no faults found.

1. Remove heater harness plug (1) from heater control

box jack (2).

2. Measure voltage between heater control box jack (2)

pin C (3) and ground with HEATER switch on

START.

3. Does multimeter read at more than 17 volts?

1. Repair/replace faulty lead

(page 14-3).

2. Verify no faults found.

3-220 
TM 9-2350-261-20-1

1. Install heater harness plug on heater control box

jack.

2. Remove heater harness plug (1) from heater

jack (2).

3. Measure voltage between plug (1) pin C (3) and

ground. With HEATER switch on START.

4. Does multimeter read at least 17 volts?.

1. Replace coolant heater (page 32-49).

2. Verify no faults found.

1. Remove heater control box (page 32-42).

2. Measure resistance between lead ends from circuit

breaker terminal 17 (1) and ON/OFF/START

switch terminal 15 (2) lead ends.

3. Does multimeter read 0 ohms?

1. Faulty coolant heater

harness.

2. Notify your supervisor.

1. Repair faulty lead

(page 14-3).

2. Verify no faults found.

GO TO NEXT

3-221
3-222

TM 9-2350-261-20-1

1. Measure resistance between lead ends from

ON/OFF/START switch terminals 21 (1) and

14 (2).

2. Does multimeter read 0 ohms?

YES

1. Replace heater ON/OFF/START switch

(page 32-42).

2. Verify no faults found.

1. Remove heater harness plug (1) from heater control

jack (2).

2. Measure voltage between heater control jack (2) pin

A (3) and ground with HEATER switch on

START.

3. Does multimeter read more than 17 volts?

1. Repair heater switch

jumper lead between

terminal 21 and 14

(page 14-3).

2. Verify no faults found.
TM 9-2350-261-20-1

1.

2.

3.

4.

Install heater harness on heater control box jack.

Remove heater harness 402A plug (1) from heater

fuel pump jack (2).

Measure voltage between plug (1) pin and ground

with HEATER switch on START.

Does multimeter read more than 17 volts?

1. Replace coolant heater fuel pump (page 32-16).

2. Verify no faults found.

1.

2.

3.

Remove heater control box (page 32-42).

Measure resistance between lead ends of heater

output jack (1) pin A (2) and ON/OFF/START

switch terminal 14 (3).

Does multimeter read 0 ohms?

1. Replace heater ON/OFF/START switch

(page 32-42).

2. Verify no faults found.

1. Faulty heater harness

circuit 402.

2. Notify your supervisor.

4

1. Repair/replace faulty Iead

(page 14-3).

2. Verify no faults found.

3-223 
TM 9-2350-261-20-1

1. Measure voltage between coolant pump to heater

harness terminal circuit 402B (1) on coolant pump

and ground with switch in start position.

2. Does multimeter read less than 17 volts?

YES

1. Measure voltage between coolant pump to heater

harness circuit 402B (1) on terminal strip (2) and

ground with switch in start position.

2. Does multimeter read less than 17 volts?

1

I

1. Replace coolant heater (page 32-49).

2. Verify no faults found. I

1. Replace coolant pump to

heater harness

(page 32-44).

2. Verify no faults found.

3-224
TM 9-2350-261-20-1

1. Is heater exhaust cold?

1. Loosen fuel inlet line (1) to heater with heater

switch on START.

2. Does fuel fail to flow out of loosened fitting?

YES

1. Inspect fuel lines between tee valve (1) and

heater (2).

2. Are all lines free from kinks, restrictions, or other

damage? 

1. Replace coolant heater fuel pump (page 32-14).

2. Verify no faults found.

1. Replace igniter

(page 32-7).

2. Verify no faults found.

1. Replace heater fuel lines as

required (Chapter 32).

2. Verify no faults found.

3-225
TM 9-2350-261-20-1

 1. Does fuel pump stay on?

YES

1. Has flame detector switch been adjusted?

1. Replace flame detector switch (page 32-4).

2. Verify no faults found.

1. Check fuel supply lines for clogged or unserviceable

hoses or

2. Are fuel

fittings.

—.

supply hoses and lines unclogged . -

serviceable:!

and

1. Replace coolant heater (page 32-49).

2. Verify no faults found.

1. Replace heater

ON/OFF/STARTswitch

(page 32-42).

2. Verify no faults found.

A. Adjust flame detector

switch (page 32-5).

2. Verify no faults found.

1. Clear obstruction or replace

fuel hoses/tubing as

required(Chapter 32).

2. Verify no faults found.

3-226
TM 9-2350-261-20-1

POWER CONTROL ENCLOSURE A1 DC INPUT/OUTPUT 

INOPERATIVE 

INITIAL SETUP 

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D) TM 11-7010-256-12&P

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10 Equipment Conditions: Helper (H)

Engine stopped/shutdown (see your –10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.1

the operation of this 

equipment 
TM 9-2350-261-20-1

1.

2.

3.

4.

Loosen wing nut (1) and raise FAX hinged

extension (2).

Loosen three wing nuts (3) and remove battery box

cover (4).

Measure voltage between positive battery terminal (5)

and ground.

Does-multimeter read 22 volts DC or more?

3-226.2 Change 3

1. Service earner batteries

(see your -10).

2. Verify no faults found.
TM 9-2350-261-20-1

1. Remove cable W4 plug P1 (1) from Power Control

Enclosure jack J25 (2).

2. Measure voltage between center of P1 (1) and ground.

3. Does multimeter read 22 volts DC or more?

1. Replace cable W4

(page 40.1-60).

2. Verify no faults found.

GO TO NEXT PAGE

Change 3 3-226.3
PAGE 3-226.6

TM 9-2350-261-20-1

1.

2.

3.

4.

5.

Install cable W4 plug P1 (1) on Power Control

Enclosure jack J25 (2).

Remove cable W6 plug P5 (3) from Power Control

Enclosure jack J26 (4).

Turn MASTER SWITCH to ON and have helper press

DC TO INVERTERS button (5) on Power Control

Enclosure panel (see your -10 and

TM 11-7010-256-128&P).

Measure voltage between center of J26 (4) and ground.

Does multimeter read 22 volts DC or more?

3-226.4 Change 3
PAGE 3-226.10

TM 9-2350-261-20-1

1. Set MASTER SWITCH to OFF (see your -10).

2. Install cable W6 plug P5 (1) on Power Control

Enclosure jack J26 (2).

3. Set MASTER SWITCH to ON (see your -10).

4. Does voltage on DC VOLTS meter (3) on Power Control

Enclosure panel read the same as voltage at earner

batteries?

 1. Verify no faults found.

Change 3 3-226.5
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

6.

Set MASTER SWITCH to OFF (see your -10).

Install cable W6 plug P5 (1) on Power Control

Enclosure jack J26 (2).

Remove cable W38 plug P7 (3) from Power Control

Enclosure jack J28 (4).

Set MASTER SWITCH to ON (see your -10).

Measure voltage between center of P7 (3) and ground.

Does multimeter read 22 volts DC or more?

GO TO PAGE 3-226.11

3-226.6 Change 3
TM 9-2350-261-20-1

GO TO NEXT PAGE Change 3 3-226.7
TM 9-2350-261-20-1

1.

2.

Measure voltage between terminals Xl (1) and X2 (2)

of relay K6 (3).

Does multimeter read 22 volts DC or more?

1.

2.

3.

Measure voltage between terminal Al (1) of relay

K6 (2) and ground.

Repeat measurement between terminal A2 (3) and

ground.

Does multimeter read 22 volts DC or more for both

measurements?

1. Faulty relay K6 in Power

Control Enclosure.

2. Notfy your supervisor.

1. Faulty relay K6 in Power

Control Enclosure.

2. Notify your supervisor.

3-226.8 Change 3
TM 9-2350-261-20-1

1.

2.

3.

4.

Have helper depress DC TO INVERTERS button (1) on

Power Control Enclosure panel.

Measure voltage between terminal 1 (2) of circuit

breaker CB2 (3) and ground.

Repeat measurement between terminal 2 (4) and

ground.

Does multimeter read 22 volts DC or more for both

measurements?

1. Raise faceplate (1) and secure to Power Control Enclosure with ten new lockwashers (2) and screws (3).

2. Verify no faults found.

1. Replace circuit breaker CB2

(page 40.1-33).

 2. Verify no faults found.

3-226. 9
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

Turn all vehicle power OFF (see your -10 and

TM 11-7010-256-12&P).

Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard lockwashers.

Set MASTER SWITCH to ON (see your -10).

Measure voltage between positive (4) and negative (5)

terminals on meter M2 (6).

Does multimeter read 22 volts DC or more, and the

same as meter M2?

1. Raise faceplate (1) and secure to Power Control Enclosure with ten new lockwashers (2) and screws (3).

2. Verify no faults found.

1. Adjust meter M2 needle to

match multimeter reading.

2. If meter cannot be adjusted,

replace DC meter M2

(page 40.1-29).

3. Verify no faults found.

3-226.10 Change 3
TM 9-2350-261-20-1 

1.

2.

3.

4.

5.

6.

Set MASTER SWITCH to OFF (see your -10).

Install cable W38 plug P7 (1) on Power Control

Enclosure jack J28 (2).

Remove circuit 415 plug P1 (3) from adapter T2 plug

P1 (4).

Set MASTER SWITCH to ON (see your -10).

Measure voltage between circuit 415 plug P1 (3) and

ground.

Does multimeter read 22 volts DC or more?

1.

2.

3.

4.

Set MASTER SWITCH to OFF (see your -10).

Remove cable W29 plug P1 (1) from adapter T2 plug

P2 (2).

—

Measure resistance between adapter T2 plugs P2 (2)

and P1 (3).

Does multimeter read 0 ohms?

GO TO NEXT PAGE

1. Go to: MASTER SWITCH

ON indicator does not light

 (page 3-129). 

1. Replace adapter T2

(page 40.1-84).

2. Verify no faults found.

Change 3 3-226.11
TM 9-2350-261-20-1

1.

2.

3.

Remove cable W29 plug P2 (1) from cable W38 plug

P6 (2).

Measure resistance between plugs P2 (1) and P1 (3) of

cable W29.

Does multimeter read 0 ohms?

1. Replace cable W29

(page 40.1-84).

2. Verify no faults found.

3-226.12 Change 3 
TM 9-2350-261-20-1 

1. Remove cable W38 plug P7 (1) from Power Control

Enclosure jack J28 (2).

2. Measure resistance between center of plugs P7 (1) and

P6 (3) of cable W38.

3. Does multimeter read 0 ohms?

1. Install cable W38 plug P7 (1) on Power Control

Enclosure jack J28 (2).

2. Install cable W38 plug P6 (3) on cable W29 plug P2 (4).

3. Install cable W29 plug P1 (5) and circuit 415 plug

P1 (6) on adapter T2 (7).

4. Verify no faults found.

1. Replace cable W38

(page 40.1-84).

2. Verify no faults found.

Change 3 3-226.13
TM 9-2350-261-20-1

NO AC POWER FROM TENT INTERFACE PANEL A5 

INITIAL SETUP

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital multimeter (Item 43, App D) TM 11-7010-256-12&P

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10 Equipment Conditions:

Helper (H)

Engine stopped/shutdown (see your –10)

Carrier blocked (see your –10)

WARNING

HIGH VOLTAGE is used in

equipment. 

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

3-226.14 Change 3

 the operation of this 
TM 9-2350-261-20-1

1.

2.

3.

4.

Remove cable W32, plug P15 (1) from Power Control

Enclosure jack J32 (2).

Apply AC power to SICPS system,

(See TM 11-7010-256-12&P).

Measure voltage between socket A to socket B of jack

J32 (2) and then socket A to socket C.

Does multimeter read 110 volts AC or more for each

measurement?

GO TO NEXT PAGE

 GO TO PAGE 3-226.17

Change 3 3-226.15
TM 9-2350-261-20-1

1. Turn all power OFF,

(see your -10 and TM 11-7010-256-12&P).

2. Remove cable W32, plug P6 (1) from Tent Interface

Panel jack J7 (2).

3. Measure resistance between pins on P6 (1) and P15 (3)

of cable W32 as follows:

P6 pin C to P15 pin A

P6 pin D to P15 pin B

P6 pin E to P15 pin C

4. Does multimeter read 0 ohms for each set of measurements?

1. Faulty Tent Interface Panel.

2. Notify your supervisor.

1. Replace cable W32

(page 40.1-78).

2. Verify no faults found.

3-226.16 Change 3
TM 9-2350-261-20-1 

1.

2.

3.

4.

5.

6.

Remove ALL power from SICPS system,

(see your -10 and TM 11-7010-256-12&P).

Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard Iockwashers.

Apply AC power to the SICPS system,

(see your -10 and TM 11-7010-256-12&P).

Set AC TENT INTERFACE PANEL circuit breaker to

ON, (see TM 11-7010-256-12&P).

Measure voltage between terminal 1 (4) of circuit

breaker CB10 (5) to anywhere on bus bar E4 (6). Repeat measurement for terminal 2 (7) to bus bar E4.

Does multimeter read 110 volts AC for each

measurement?

GO TO NEXT PAGE

1. Replace circuit breaker CB10

(page 40.1-33).

2. Verify no faults found.

Change 3 3-226.17
TM 9-2350-261-20-1

1. Raise faceplate (1) and secure to Power Control Enclosure with ten new lockwashers (2) and screws (3).

2. Press ground fault interrupter TEST button (4).

3. Does RESET button (5) pop out?

1. Go to: No Power To AC Circuits (page 3-226.97).

1. Faulty ground fault interrupter.

2. Notify your supervisor.

3-226.18 Change 3
TM 9-2350-261-20-1 

NO DC POWER FROM TENT INTERFACE PANEL A5 

INITIAL SETUP

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital multimeter (Item 43, App D) TM 11-7010-256-12&P

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10

Helper (H) Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment. 

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

DO NOT attempt power cable

connections until grounding system and

signal/data cabling have been completed.

GO TO NEXT PAGE

Change 3 3-226.19

 the operation of this
TM 9-2350-261-20-1 

1. Remove cable W32, plug P16 (1) from Power Control

Enclosure jack J36 (2).

2. Turn MASTER SWITCH to ON (see your -10).

3. Set DC TENT INTERFACE panel switch to ON

(see TM 11-7010-256-12&P).

4. Measure voltage between jack J36 (2) socket A to

socket B.

5. Does multimeter read 22 volts DC or more?

GO TO PAGE 3-226.22

3-226.20 Change 3
TM 9-2350-261-20-1 

1.

2.

3.

4.

Turn MASTER SWITCH to OFF (see your -10).

Remove cable W32, plug P6 (1) from TENT

INTERFACE panel jack J7 (2).

Measure resistance between pin A on plug P6 (1) and

pin A on P16 (3) of cable W32. Repeat for pins B.

Does multimeter read 0 ohms for each set of measurements?

1. Faulty Tent Interface Panel.

2. Notify your supervisor.

1. Replace cable W32

(page 40.1-78).

2. Verify no faults found.

Change 3 3-226.21
TM 9-2350-261-20-1 

1. Turn MASTER SWITCH to OFF (see your -10).

2. Remove ten screws (1) and lockwashers (2) and lower

faceplate (3). Discard lockwashers.

3. Set DC TENT INTERFACE panel circuit breaker to

ON (see TM 11-7010-256-12&P).

4. Measure resistance between terminals (4) of circuit

breaker CB16 (5).

5. Does multimeter read 0 ohms?

1. Raise faceplate (1) and secure to Power Control Enclosure with ten new lockwashers (2) and screws (3).

2. Go to: Power Control Enclosure DC Input/Output

Inoperative (page 3-226.1).

1. Replace circuit breaker CB16

(page 40.1-33).

2. Verify no faults found.

3-226.22 Change 3
TM 9-2350-261-20-1 

NO POWER FROM ROADSIDE AC POWER EXTENSION BOX A6 

INITIAL SETUP

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

TM 11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment. 

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.23

the operation of this
TM 9-2350-261-20-1 

1. Remove cable W7 plug P10 (1) from Power Control

Enclosure jack J30 (2).

2. With AC power accepted, set AC LEFT OUTLETS

switches (3) on Power Control Enclosure panel to ON

(see TM 11-7010-256-12&P).

3. Measure voltage between sockets A and B of jack J30

(2) . Repeat measurement for sockets C and D.

4. Does multimeter read 110 volts AC or more for both

measurements?

3-226.24 Change 3

GO TO PAGE 3-226.26
TM 9-2350-261-20-1 

1.

2.

3.

4.

Set AC LEFT OUTLETS switches to OFF and remove

all power from SICPS system (see your-10 and

TM 11-7010-256-12&P). 

Remove cable W7 plug P1 (1) from Roadside AC Power

Extension Box jack J1 (2).

Measure resistance between pins of plugs P1 (1) and

P10 (3) on cable W7 as follows:

P1 pin A to P10 pin A

P1 pin B to P10 pin B

P1 pin C to P10 pin C

P1 pin D to P10 pin D

P1 pin E to P10 pin E

Does multimeter read 0 ohms for each set of pins?

1. Replace Roadside AC Power Extension Box A6

(page 40.1-48).

2. Verify no faults found.

1. Replace cable W7

(page 40.1-66).

2. Verify no faults found.

Change 3 3-226.25
TM 9-2350-261-20-1 

1.

2.

3.

4.

5.

Turn MASTER POWER switch to OFF

(see your -10 and TM 11-7010-256-12&P).

Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard lockwashers.

Turn ON AC LEFT OUTLETS circuit breakers CB6 (4)

and CB7 (5).

Measure resistance between terminals 1 and 2 (6) of

circuit breakers CB6 (4) and CB7 (5).

Does multimeter read 0 ohms for each measurement?

1. Raise faceplate (1) and secure to Power Control Enclosure with ten new Iockwashers (2) and screws (3).

2. Go to: No Power To AC Circuits (page 3-226.97).

NOTE

Resistance in CB6 and CB7

should be 0 ohms. If any

resistance is present,

replace that CB.

1. Replace circuit breaker CB6

and/or CB7 (page 40.1-33).

2. Verify no faults found.

3-226.26 Change 3
TM 9-2350-261-20-1

NO POWER FROM CURBSIDE AC POWER EXTENSION BOX A7 

INITIAL SETUP 

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

TM 11-7010-256-12&P 

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your –10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment. 

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.27

the operatio of this
TM 9-2350-261-20-1 

1.

2.

3.

4.

Remove cable W8 plug P11 (1) from Power Control

Enclosure jack J31 (2).

With AC power accepted, set AC RIGHT OUTLETS

switches (3) on Power Control Enclosure panel to ON

(see TM 11-7010-256-12&P).

Measure voltage between sockets A and B of jack

J31 (2). Repeat measurement for sockets C and D.

Does multimeter read 110 volts AC or more for both

measurements?

 GO TO PAGE 3-226.30

3-226.28 Change 3
1.

2.

3.

4.

Set AC RIGHT OUTLETS switches (1) to OFF and

remove ALL power from SICPS system

(see your -10 and TM 11-7010-256-12&P).

Remove cable W8 plug P1 (2) from Curbside AC Power

Extension Box jack J1 (3).

Measure resistance between pins of plugs P1 (2) and

P11 (4) on cable W8 as follows:

P1 pin A to P11 pin A

P1 pin B to P11 pin B

P1 pin C to P11 pin C

P1 pin D to P11 pin D

P1 pin E to P11 pin E

Does multimeter read 0 ohms for each set of pins?

1. Replace Curbside AC Power Extension Box A7

(page 40.1-12).

2. Verify no faults found.

TM 9-2350-261-20-1

1. Replace cable W8

(page 40.1-68). I

 2. Verify no faults found.

Change 3 3-226.29
TM 9-2350-261-20-1 

1. Turn MASTER POWER switch to OFF

(see your -10 and TM 11-7010-256-12&P).

 2. Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard lockwashers.

3. Turn ON AC RIGHT OUTLETS circuit breakers CB8

(4) and CB9 (5).

4. Measure resistance between terminals 1 and 2 (6) of

circuit breakers CB8 (4) and CB9 (5).

5. Does multimeter read 0 ohms for each measurement?

1. Raise faceplate (1) and secure to Power Control Enclosure with ten new lockwashers (2) and screws (3).

2. Go to: No Power To AC Circuits (page 3-226.97).

NOTE

Resistance in CB8 and CB9

should be 0 ohms. If any

resistance is present,

replace that CB.

1. Replace circuit breaker CB8

and/or CB9 (page 40.1-33).

2. Verify no faults found.

3-226.30 Change 3
TM 9-2350-261-20-1

NO POWER FROM DC POWER EXTENSION BOX A8 

INITIAL SETUP

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

TM 11-7010-256-12&P 

See M1068 Wiring Diagram

(FO-9 thru Fo-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment. 

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.31

the operation of this
TM 9-2350-261-20-1 

1. Remove cable W9 plug P15 (1) from Power Control

Enclosure jack J35 (2).

2. Set DC RIGHT OUTLETS switches (3) on Power

Control Enclosure panel to ON

(see TM 11-7010-256-12&P).

3. Set MASTER SWITCH to ON (see your -10).

4. Measure voltage between sockets A and B of jack

J35 (2). Repeat measurement for sockets C and D.

5. Does multimeter read 22 volts DC or more for both

measurements?

3-226.32 Change 3

GO TO PAGE 3-226.34
TM 9-2350-261-20-1

1. Turn MASTERSWTCH to OFF (see your -10).

2. Remove cable W9 plug P1 (1) from DC Power Extension

Box A8 jack J1 (2).

3. Measure resistance between pins of plugs P1 (1) and

P15 (3) on cable W9 as follows:

P1 pin A to P15 pin A

P1 pin B to P15 pin B

P1 pin C to P15 pin C

P1 pin D to P15 pin D

4. Does multimeter read 0 ohms for each measurement?

1. Replace DC Power Extension Box A8 (page 40.1-13).

2. Verify no faults found.

1. Replace cable W9

(page 40.1-70).

2. Verify no faults found.

Change 3 3-226.33
TM 9-2350-261-20-1 

1.

2.

3.

4.

5.

Turn MASTER SWITCH to OFF (see your –10).

Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard lockwashers.

Turn ON DC RIGHT OUTLETS circuit breakers CB14

(4) and CB15 (5).

Measure resistance between terminals 1 and 2 (6) of

circuit breakers CB14 (4) and CB15 (5).

Does multimeter read 0 ohms for each measurement?

1.

2.

Raise faceplate (1) and secure to Power Control Enclosure with ten new lockwashers (2) and screws (3).

Go to: Power Control Enclosure A1 DC Input/Output

Inoperative (page 3-226.1).

NOTE

Resistance in CB14 and

CB15 should be 0 ohms. If

any resistance is present,

replace that CB.

1. Replace circuit breakers

CB14 and/or CB15

(page 40.1-33).

2. Verify no faults found.

3-226.34 Change 3
TM 9-2350-261-20-1 

NO POWER FROM DC POWER EXTENSION BOX A9 

(ALL EXCEPT JACK J23) 

INITIAL SETUP 

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D) TM 11-7010-256-12&P 

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10

Helper (H) Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment. 

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3

the operation of this 

3-226.35 
TM 9-2350-261-20-1 

1. Remove cable W10 plug P14 (1) from Power Control

Enclosure jack J34 (2).

2. Turn MASTER SWITCH to ON (see your -10).

3. Set DC LEFT OUTLETS switches (3) on Power Control

Enclosure panel to ON (see TM 11-7010-256-12&P).

4. Measure voltage between sockets A and B of jack

J34 (2). Repeat measurement for sockets C and D.

5. Does multimeter read 22 volts DC or more for each

measurement?

GO TO PAGE 3-226.38

3-226.36 Change 3
TM 9-2350-261-20-1 

1. Turn MASTER SWITCH to OFF (see your -10).

2. Remove cable W10 plug P1 (1) from DC Power

Extension Box A9 jack J1 (2).

3. Measure resistance between pins of plugs P1 (1) and

P14 (3) on cable W10 as follows:

P1 pin A to P14 pin A

P1 pin B to P14 pin B

P1 pin C to P14 pin C

P1 pin D to P14 pin D

4. Does multimeter read 0 ohms for each set of pins?

1. Replace DC Power Extension Box A9 (page 40.1-48).

2. Verify no faults found.

1. Replace cable W10

(page 40.1-73).

2. Verify no faults found.

Change 3 3-226.37
TM 9-2350-261-20-1 

1.

2.

3.

4.

5.

Turn MASTER SWITCH to OFF (see your –10).

Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard lockwashers.

Turn ON DC LEFT OUTLETS circuit breakers CB12

(4) and CB13 (5).

Measure resistance between terminals 1 and 2 (6) of

circuit breakers CB12 (4) and CB13 (5).

Does multimeter read 0 ohms for each measurement?

1.

2.

Raise faceplate (1) and secure to Power Control Enclosure with ten new lockwashers (2) and screws (3).

Go to: Power Control Enclosure A1 DC Input//Output

Inoperative (page 3-226.1).

. .

NOTE

Resistance in CB12 and

CB13 should be 0 ohms. If

any resistance is present,

replace that CB.

1. Replace circuit breakers

CB12 and/or CB13

(page 40.1-33).

2. Verify no faults found.

3-226.38 Change 3
TM 9-2350-261-20-1 

NO POWER FROM DC POWER EXTENSION BOX A9, JACK J23 

(JTIDS )

INITIAL SETUP 

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D) TM 11-7010-256-12&P 

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10

Helper (H) Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment. 

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.39

the operation of this 
TM 9-2350-261-20-1

1. Remove cable W45 plug P13 (1) from Power Control

Enclosure jack J33 (2).

2. Turn MASTER SWITCH to ON (see your -10).

3. Set JTIDS switch (3) on Power Control Enclosure panel

to ON (see TM 11-7010-256-12&P).

4. Measure voltage between sockets A and B of J33 (2).

5. Does multimeter read 22 volts DC or more?

3-226.40 Change 3

GO TO PAGE 3-226.42
TM 9-2350-261-20-1 

1.

2.

3.

4.

Turn MASTER SWITCH to OFF (see your -10).

Remove cable W45 plug P1 (1) from DC Power

Extension Box A9 jack J2 (2).

Measure resistance between plug P1 (1) pin A and P13

(3) pin A of cable W45. Repeat measurement for pins B.

Does multimeter read 0 ohms for each measurement?

1. Replace DC Power Extension Box A9 (page 40.1-48).

2. Verify no faults found.

1. Replace cable W45

(page 40.1-90).

2. Verify no faults found. I

Change 3 3-226.41 
TM 9-2350-261-20-1 

1. Turn MASTER SWITCH to OFF (see your -10).

2. Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard lockwashers.

3. Turn ON JTIDS circuit breaker CB11 (4).

4. Measure resistance between terminals 1 and 2 (5) of

circuit breaker CB11 (4).

5. Does multimeter read 0 ohms?

1. Raise faceplate (1) and secure to Power Control Enclosure with ten new lockwashers (2) and screws (3).

2. Go to: Power Control Enclosure A1 DC Input/Output

Inoperative (page 3-226.1).

1. Replace circuit breaker CB11

(page 40.1-33).

2. Verify no faults found.

3-226.42 Change 3
TM 9-2350-261-20-1 

NO DC POWER TO SINGLE POINT LAN GROUND BOX A15 

(M1068 ONLY) 

INITIAL SETUP 

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D) See TM 11-7010-256-12&P

See M1068 Wiring Diagram

Personnel Required (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10

Helper (H)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNIN G

HIGH VOLTAGE is used in

the operation of this

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.43
TM 9-2350-261-20-1 

1. Remove cable W40 plug P1 (1) from DC Power

Extension Box A8 jack J17 (2).

2. Turn MASTERSWITCH to ON (See your -10).

3. Set DC RIGHT OUTLETS switches (3) on Power Control Enclosure to ON (see TM 11-7010-256-12&P).

4. Measure voltage between sockets A and B of J17 (2).

5. Does multimeter read 22 volts DC or more?

1. Turn MASTER SWITCH to OFF (see your -10).

2. Disconnect cable W40 plug P2 (1) from Single Point

LAN Ground Box A15 jack J1 (2).

3. Measure resistance between plug P1 (3) pin A and P2

(1) pin A of cable W40. Repeat measurement for pins B.

4. Does multimeter read 0 ohms for each measurement?

1. Go To: No Power From DC

Power Extension Box A8

(page 3-226.31).

2. Verify no faults found.

1. Replace cable W40

(page 40.1-86).

2. Verify no faults found.

1. Repair LAN Ground Box A15 (page 40.1-16).

2. Verify no faults found.

3-226.44 Change 3
TM 9-2350-261-20-1 

NO POWER FROM UPS POWER EXTENSION BOX A16 

INITIAL SETUP

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) see your -10

Digital Multimeter (Item 43, App D) TM 11-7010-256-12&P 

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10

Helper (H)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

the operation of this

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.45
TM 9-2350-261-20-1

1. Open front cover on ATCCS UPS Storage Box and

remove cable W41 plug P1 (1) from UPS jack AC OUT.

2. Remove cable W41 plug P2 (2) from UPS Power

Extension Box A16 jack J4 (3).

3. Measure resistance between pins of plugs P1 (1) and

P2 (2) of cable W41 as follows:

P1 pin H to P2 socket A

P1 pin N to P2 socket B

P1 pin G to P2 socket C

4. Does multimeter read 0 ohms for each measurement?

3-226.46 Change 3

1. Replace cable W41

(page 40.1-88).

2. Verify no faults found.
TM 9-2350-261-20-1

1. Remove cable W50 plug P1 (1) from UPS Power

Extension Box A16 jack J1 (2).

2. Measure resistance between jacks J1 (2), J2 (3), J3 (4),

and J4 (5) of UPS Power Extension Box A16 as follows:

J1 socket H to J2 and J3 socket H

J1 socket N to J2 and J3 socket N

J1 socket G to J2 and J3 socket G

J1 socket H to J4 pin A

J1 socket N to J4 pin B

J1 socket G to J4 pin C

3. Does multimeter read 0 ohms for each measurement?

1. Faulty ATCCS UPS Power.

2. Notify your supervisor.

1. Replace/repair UPS Power

Extension Box A16

(page 40.1-8).

2. Verify no faults found.

Change 3 3-226.47
TM 9-2350-261-20-1

NO POWER FROM UPS POWER EXTENSION BOX A17 

INITIAL SETUP 

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

see your -10

TM 11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

the operation of this

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

3-226.48 Change 3
TM 9-2350-261-20-1

1.

2.

3.

4.

Remove cable W50 plug P1 (1) from UPS Power

Extension Box A16 jack J1 (2).

Remove cable W50 plug P2 (3) from UPS Power

Extension Box A17 jack J4 (4).

Measure resistance between pins of plugs P1 (1) and

P2 (3) of cable W50 as follows:

P1 pin H to P2 socket A

P1 pin N to P2 socket B

P1 pin G to P2 socket C

Does multimeter read 0 ohms for each measurement?

GO TO

1. Replace cable W50

(page 40.1-92).

2. Verify no faults found.

NEXT PAGE

Change 3 3-226.49
TM 9-2350-261-20-1

1. Measure resistance between jacks J1 (1), J2 (2), J3 (3),

and J4 (4) of UPS Power Extension Box A17 as follows:

J1 socket H to J2 and J3 socket H

J1 socket N to J2 and J3 socket N

J1 socket G to J2 and J3 socket G

J1 socket H to J4 pin A

J1 socket N to J4 pin B

J1 socket G to J4 pin C

2. Does multimeter read 0 ohms for each measurement?

1. Replace/repair UPS Power

Extension Box A17 I

(page 40.1-8).

2. Verify no faults found.

1. Faulty ATCCS UPS Power.

2. Notify your supervisor.

3-226.50 Change 3 
TM 9-2350-261-20-1 

NO AC/DC INPUT TO ATCCS UPS POWER BOX 

INITIAL SETUP 

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D) TM 11-7010-256-12&P

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10

Helper (H) Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment. 

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.51

the operation of this
TM 9-2350-261-20-1 

1. Remove cable W43 plug P2 (1) from Roadside AC Power

Extension Box A6 jack J6 (2).

2. Apply AC power to SICPS system

(see TM 11-7010-256-12&P).

3. Set AC LEFT OUTLETS switches on Power Control

Enclosure panel to ON.

4. Measure voltage between sockets H and N of J6 (2).

5. Does multimeter read 110 volts AC or more?

3-226.52 Change 3

1. Go to: No Power From Road-

 side AC Power Extension

 Box A6 (page 3-226.23) .
TM 9-2350-261-20-1 

1. Turn all AC power OFF (TM 11-7010-256-12&P).

2. Open front cover on ATCCS UPS Storage Box and

remove cable W43 plug P1 (1) from UPS jack AC IN.

3. Measure resistance between pins of plugs P2 (2) and

P1 (1) of cable W43 as follows:

P2 pin H to P1 pin B

P2 pin N to P1 pin A

P2 pin G to P1 pin D

P1 pin F to P1 pin G

4. Does multimeter read 0 ohms for each measurement?

GO TO NEXT PAGE

Change 3 3-226.53

1. Replace cable W43 

 (page 40.1-88) .

2. Verify no faults found.
page 40.1-77

TM 9-2350-261-20-1

3-226.54 Change 3
TM 9-2350-261-20-1

1. Install ground strap W12 terminal (1), new lockwasher

(2), and nut (3) on ATCCS UPS storage box (4).

2. Install ground strap W12 terminal (5), new lockwasher

(6), and screw (7) on ground lug (8).

3. Remove cable W42 plug P2 (9) from DC Power

Extension Box A9 jack J21 (10).

4. Set MASTER SWITCH to ON (see your -10).

5. Set DC LEFT OUTLETS switches on Power Control

Enclosure panel to ON (see TM 11-7010-256-12&P).

6. Measure voltage between sockets A and B of J21 (10).

7. Does multimeter read 22 volts DC or more?

GO TO NEXT PAGE

1. Go to: No Power from DC

Power Extension Box A9

(page 3-226.35).

Change 3 3-226.55
TM 9-2350-261-20-1 

1. Set MASTER SWITCH to OFF (see your -10).

2. Open front cover on ATCCS UPS Storage Box and

remove cable W42 plug P1 (1) from UPS jack DC IN.

3. Measure resistance between pins of plugs P2 (2) and

P1 (1) of cable W42 as follows:

P2 pin A to P1 pin A, E, and F

P2 pin B to P1 pin B, C, and D

1. Faulty ATCCS UPS Power.

2. Notify your supervisor.

1. Replace cable W42

(page 40.1-88).

2. Verify no faults found.

3-226.56 Change 3
TM 9-2350-261-20-1 

IN BLACKOUT MODE, FLUORESCENT LIGHTS OPERATE 

INCORRECTLY 

INITIAL SETUP 

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital multimeter (Item 43, App D)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

References (cont):

See TM 11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your –10)

All AC External and Internal Power is OFF

(see TM 710-256-12&P)

Carrier blocked (see your –10)

WARNING

HIGH VOLTAGE is used in

operation of this equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person is near by and is

familiar with its operations and hazards.

That person should also be familiar with

giving first aid. When an operator helps a

mechanic, that operator must be warned

about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all AC

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

3-226.57
TM 9-2350-261-20-1 

1.

2.

3.

4.

5

Disconnect cable W28, plug P2 (1) from light lead (2).

Ensure ramp door is open or down. Set MASTER

SWITCH to ON (see your-10 and

TM 11-7010-256-12&P).

Turn on dome lights from either the front dome light

switch (on master switch panel) or at the rear dome

light switch near the ramp. To do this, the

blackout-by-pass switch must be OFF, the ramp up,

and the rear door closed.

Measure voltage between plug P2 (1) and ground. Use

multimeter.

Does multimeter read 22 volts DC or more?

1. Turn MASTER SWITCH to OFF (see your-10). 1. Replace light bulbs

2. Have light bulbs been replaced? (page 12-65).

 2. Verify no faults found.

1. Repair light assembly (page 12-65).

2. Verify no faults found.

3-226.58

GO TO PAGE 3-226.59
TM 9-2350-261-20-1 

1. Set MASTER SWITCH to OFF (see your-10).

2. Remove cable W28, plug P1 (1) from adapter plug

P1 (2).

3. Measure resistance between cable W28 plugs P1 and

P2 (3).

4. Does multimeter read 0 ohms?

YES

1. Remove lead 38B (1) from adapter plug P3 (2).

2. Set MASTER SWITCH to ON (see your -10).

3. Measure voltage between lead 38B (1) and ground.

4. Does multimeter read 22 volts DC or more?

1. Refer to: “Dome Lights Malfunction (M577A2)”

(page 3-117).

GO TO NEXT PAGE

3-226.59

1. Replace cable W28

 (page 40.1-82) .

2. Verify no faults found.
TM 9-2350-261-20-1

1. Set MASTER SWITCH to OFF (see your-10).

2. Remove cable W35, plug P1 (1) from adapter plug

P2 (2).

3. Measure resistance between plugs P1 (3), P2 (2), and

P3 (4) of adapter (5).

4. Does multimeter read 0 ohms for each measurement?

1. Replace adapter

(page 40.1-82).

2. Verify no faults found.

3-226.60
1.

2.

3.

Remove cable W35, plug P9 (1) from jack J29 (2) of

Power Control Enclosure.

Measure resistance between plugs P1 (3) and P9 (1) of

cable W35.

Does multimeter read 0 ohms?

GO TO NEXT PAGE

TM 9-2350-261-20-1

1. Replace cable W35

(page 40.1-82).

2. Verify no faults found.

 3-226.61
TM 9-2350-261-20-1 

WARNING

Make sure ALL AC external

and internal power is OFF.

1. Faulty inside lead 34A of

Power Control Enclosure.

2. Notify your Supervisor.

1. Install front light lead 38B (1) on cable W28 P2 (2) and

cable to plug P1 of adapter (3).

2. Install rear domelight lead 38B (4) on plug P3 of

adapter (3).

3. Remove ten screws (5) and lockwashers (6), and lower

faceplate (7). Discard lockwashers.

4. Lift relay bail (8) and remove XK2 relay (9) from relay

socket (10).

5. Measure resistance between jack J29 center pin (11)

and pin X1 (12) of relay XK5 (13).

6. Does multimeter read 0 ohms?

3-226.62
TM 9-2350-261-20-1 

1. Install cable W35 plug P1 (1) on adapter plug P2 (2).

2. Install W35 plug P9 (3) on jack 29 (4) of Power Control

Enclosure.

3. Measure resistance between relay XK5 (5), pin X2 (6),

and relay XK3 (7), pin X2 (8).

4. Does multimeter read O ohms?

1. Faulty lead 3F of XK2.

2. Notify your Supervisor.

GO TO NEXT PAGE

3-226.63
TM 9-2350-261-20-1

1. Measure resistance between relay XK3 (1), pin X2 (2)

and terminal block E4 (3).

2. Does multimeter read 0 ohms?

3. Lift relay bail (4) and install XK2 relay (5) on relay

socket (6).

1. Faulty lead 3E of XK3.

2. Notify your Supervisor,

3-226.64
TM 9-2350-261-20-1

1.

2.

3.

4.

Raise faceplate (1) and secure to enclosure with ten new

lockwashers (2) and screws (3).

Set MASTER SWITCH to ON. Set vehicle

BLACKOUT LIGHT to ON. Be sure ramp door is open

(see your-10).

Apply AC power to SICPS system. Set BLACKOUT

ENABLE switch (4) on Power Control Enclosure panel

in upward position (TM 11-7010-256-12&P).

Do fluorescent lights illuminate?

1. Verify no faults found.

1. Faulty relay XK5.

2. Notify your Supervisor.

3-226.65

-—--.--= —.— —.——-—. ~==. .-=—- ———-——-—--
TM 9-2350-261-20-1

FLUORESCENT LIGHTS DO NOT OPERAT E

INITIAL SETU P

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital multimeter (Item 43, App D)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

See TM 10-5410-229-13&P

See TM 11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

Change 3

the operation of this

3-226.66
TM 9-2350-261-20-1

1. Has light assembly fuse been replaced? NO 1. Replace fuse

(see TM 10-5410-229-13&P).

YES 2. Verify no faults found.

.

1. Has fluorescent lamp(s) been replaced? 1. Replace lamp

(see TM 10-5410-229-13&P).

1. Remove all power (see your -10 and

TM 11-7010-256-12&P).

2. Remove cable W11, plug P17 (1) from power control

enclosure jack J37 (2).

3. Apply AC power and set AC LIGHTS and BLACKOUT

ENABLE switches to upward position

(see TM 11-7101-256-12&P).

4. Measure voltage between sockets A and B of jack

J37 (2).

5. Does multimeter read 110 volts AC or more?

2. Verify no faults found.

1. Go to: No Power To AC Circuits (page 3-226.97).

GO TO NEXT PAGE

Change 3 3-226.67
TM 9-2350-261-20-1

1.

2.

3.

4.

Set power control enclosure AC MAIN switch to OFF

(see TM 11-7010-256-12&P).

Remove cable W11 plug P2 (1) from light assembly plug

P1 (2).

Measure resistance between sockets of P2 (1) and pins

of plug P17 (3) on cable W11 (4) as follows:

P2 socket H to P17 pin A

P2 socket N to P17 pin B

P2 socket G to P17 pin C

Does multimeter read 0 ohms for each measurement?

1. Repair/replace light set assembly

(See TM 10-5410-229-13&P).

1. Replace cable W11 (page

40.1-75).

2. Verify no faults found.

3-226.68 Change 3
TM 9-2350-261-20-1

VEHICLE BATTERIES DISCHARGE WITH EXTERNAL AC POWE R

APPLIE D

INITIAL SETU P

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital multimeter (Item 43, App D) TM 11-7010-256-12&P

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-generation Equipment Repairer 52D10

Helper (H) Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your –10)

WARNING

HIGH VOLTAGE is used in

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.69

the operation of this
TM 9-2350-261-20-1

1.

2.

3.

4.

Remove ten screws (1), lock washers (2), and lower

faceplate (3) on Power Control Enclosure. Discard lock

washers.

Set MASTER SWITCH to ON (see your-10).

Measure voltage between positive (+) terminal (4) on

meter M2 (5) and ground.

Does multimeter read 22 volts DC or more?

1.

2.

Measure voltage between positive (+) terminal (1) and

negative (-) terminal (2) of meter M2.

Does multimeter read 22 volts DC or more?

1. Go to: Power Enclosure DC

Input/Output Inoperative

(page 3-226.1).

1. Replace meter M2

(page 40.1-29).

2. Verify no faults found.

3-226.70 Change 3
TM 9-2350-261-20-1

1.

2.

3.

4.

Set MASTER SWITCH to OFF (see your-10).

Apply external AC power to SICPS vehicle

(see TM 11-7010-256-12&P).

Measure voltage between terminal 1 (1) of circuit

breaker CB1 (2) and terminal block E4 (3).

Does multimeter read 110 volts AC or more?

1.

2.

3.

Set AC MAIN switch to ON

(see TM 11-7010-256-12&P).

Measure voltage between terminal 2 (1) of circuit

breaker CB1 (2) and anywhere on terminal block

E4 (3).

Does multimeter read 110 volts AC or more?

1. Go to: Vehicle Will Not Accept External AC Power

(page 3-226.80).

1. Replace circuit breaker CB1

(page 40.1-33).

2. Verify no faults found.

GO TO NEXT PAGE

Change 3 3-226.71
TM 9-2350-261-20-1

1. Set DC POWER SUPPLY switch to ON

(see TM 11-7010-256-128ZP).

2. Measure voltage between terminal 1 (1) of circuit

breaker CB5 (2) to terminal block E4 (3).

3. Does multimeter read 110 volts AC or more?

1. Measure voltage between terminal 2 (1) of circuit

breaker CB5 (2) and terminal block E4 (3).

2. Does multimeter read 110 volts AC or more?

1. Faulty circuit 9D.

2. Notify your Supervisor.

1. Replace circuit breaker CB5

(page 40.1-33).

2. Verify no faults found.

3-226.72 Change 3
TM 9-2350-261-20-1

1.

2.

3.

4.

Turn OFF AC/DC Power.

Remove 12 screws (1), lockwashers (2), and cover (3)

from Power Control Enclosure (4). Discard lockwashers.

Measure resistance between terminal 2 (5) of circuit

breaker CB5 (6) and AC HIGH terminal (7) of power

supply PS2 (8) .

Does multimeter read 0 ohms?

GO TO NEXT PAGE

1. Faulty circuit 10A.

2. Notify your Supervisor.

Change 3 3-226.73
TM 9-2350-261-20-1 

1.

2.

Measure resistance between terminal AC LOW (1) of

power supply PS2 (2) and terminal L2 (3) of relay

K1 (4).

Does multimeter read 0 ohms?

1. Faulty circuit 8B.

2. Notify your Supervisor.

3-226.74 Change 3
1.

2.

3.

4.

Measure resistance between circuit 10B terminals(1)

on power supply PS2 (2) and power supply PS1 (3).

Measure resistance between circuit 8C terminals(4) on

power supply PS2 (2) and power supply PS1 (3).

Measure resistance between circuit 3Z terminals (5) on

power supply PS2 (2) and power supply PS1 (3).

Does multimeter read 0 ohms for each measurement?

1. Install 12 screws (6), new lockwashers (7), and cover

(8) on Power Control Enclosure (9).

2. Raise faceplate on Power Control Enclosure (9) and secure with ten screws (10) and new lockwashers (11).

3. Faulty power supply(s).

4. Notify your Supervisor.

TM 9-2350-261-20-1 

1. Faulty circuit 10B, 8C,

and/or 3Z.

2. Notify your Supervisor.

Change 3 3-226.75
TM 9-2350-261-20-1

VEHICLE WILL NOT ACCEPT EXTERNAL AC POWE R

INITIAL SETU P

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital multimeter (Item 43, App D)

Personnel Required:

Power–Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

References (cont):

TM 11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your –10)

Carrier blocked (see your –10)

Vehicle grounded (see your –10 and

TM 11-7010-256-12&P)

WARNING

HIGH VOLTAGE is used in

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechcanic, that operator must be warned about dangerous

areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

1. Is SICPS system properly grounded? NO 1. Ensure SICPS Grounding

(see TM 11-7010-256-12&P

Change 3

the operation of this

3-226.76
TM 9-2350-261-20-1

1. Is external source read between 103 and 135 vac? 1. Apply a new source of external AC power.

1. Apply external source of AC power to SICPS vehicle

(TM 11-7010-256-12&P).

2. Remove cable W1 leads (1) from generator (2), if

applicable.

3. Remove cable W2, J1 (3) from Power Entry Box (4).

4. Measure resistance between W1 leads and W2 plug J1

as follows:

W1 HOT to J1 pin A

W1 NEU to J1 pin N

W1 GND1 to J1 pin G1

W1 GND2 to J1 pin G2

5. Does multimeter read 0 ohms for all readings?

2. Verify no faults found.

1. Replace cable W1/2

(see TM 11-7010-256-12&P).

2. Verify no faults found.

GO TO NEXT PAGE

Change 3 3-226.77
TM 9-2350-261-20-1

1. Remove 12 screws (1), lockwashers (2), and lid (3) from

Power Distribution Box (4).

2. Measure resistance between Power Entry Box A4 plug

P1 (5) and Power Distribution Box A3 (4) terminal

block as follows:

P1 socket A to Post E1

P1 socket N to Post E2

P1 socket G1 to Post E3

P1 socket G2 to Post E3

3. Does multimeter read 0 ohms for each reading?

1. Replace Power Entry Box A4

(page 40.1-54).

2. Verify no faults found.

3-226.78 Change 3
 TM 9-2350-261-20-1

1. Replace cable W3

(page 40.1-58).

2. Verify no faults found.

1.

2.

3.

Remove cable W3 plug P1 (1) from jack J1 (2) on Power

Distribution Box (3) and plug P3 (4) from jack J24 (5)

on Power Control Enclosure (6).

Measure resistance between plug P1 (1) and plug

P3 (4) as follows:

P1 pin A to P3 socket A

P1 pin B to P3 socket B

PI pin C to P3 socket C

Does multimeter read 0 ohms for each reading?

1. Faulty Power Control Enclosure.

2. Notify your Supervisor.

Change 3 3-226.79
TM 9-2350-261-20-1

VEHICLE WILL NOT ACCEPT INVERTER AC POWE R

INITIAL SETU P

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital multimeter (Item 43, App D)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

References (cont):

TM 11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Vehicle grounded (see your -10 and

TM 11-7010-256-12&P)

WARNING

HIGH VOLTAGE is used in

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

3-226.80 Change 3

the operation of this
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

6.

Remove all external power from SICPS system (see

your -10 and TM 11-1070-256-12&P).

Remove cable W5 plug P6 (1) from power enclosure jack

J27 (2).

Turn MASTER POWER switch ON.

Turn on inverters (TM 11-1070-256-12&P).

Measure voltage between pins A and B of plug P6 (1).

Repeat measure for pins C and D.

Does multimeter read 110 volts AC or more for both

measurements?

GO TO NEXT PAGE

1. Go to: No AC Power From

Inverters (page 3-226.114).

Change 3 3-226.81
TM 9-2350-261-20-1

1. Turn MASTER POWER switch OFF.

2. Install cable W5 on power enclosure.

3. Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard lockwashers.

4. Measure resistance between circuit breaker CB3 pin 2

(4) and reversing contactor RC1-REV terminal L1 (5).

5. Does multimeter read 0 ohms?

Change 3

1. Faulty lead 13A.

2. Notify your Supervisor.

3-226.82
TM 9-2350-261-20-1

1.

2.

Measure resistance between reversing contactor

RC1-REV terminal L1 (1) and reversing contactor

RC1-FWD terminal 51 (2).

Does multimeter read 0 ohms?

GO TO NEXT PAGE

1. Faulty lead 13D.

2. Notify your Supervisor.

Change 3 3-226.83
TM 9-2350-261-20-1

1.

2.

Measure resistance between reversing contactor

RC1-FWD terminal 52 (1) and relay K4 terminal

A3 (2).

Does multimeter read 0 ohms?

Change 3

1. Faulty lead 14A.

2. Notify your supervisor.

3-226.84
1.

2.

TM 9-2350-261-20-1 

Measure resistance between relay K4 terminal A2 (1)

and reversing contactor RC1-REV terminal A2 (2).

Does multimeter read 0 ohms?

1. Faulty lead 16A.

2. Notify your Supervisor.

GO TO NEXT PAGE

Change 3 3-226.85
TM 9-2350-261-20-1

1.

2.

Measure resistance between reversing contactor

RC1-REV terminal A1 (1) and terminal L2 (2).

Does multimeter read 0 ohms?

Change 3

1. Faulty lead 28D.

2. Notify your Supervisor.

3-226.86
TM 9-2350-261-20-1 

1.

2.

Measure resistance between reversing contactor

RC1-REV terminal L2 (1) and anywhere on terminal

block E4 (2).

Does multimeter read 0 ohms?

1. Faulty lead 28G.

2. Notify your Supervisor.

GO TO NEXT PAGE

Change 3 3-226.87
TM 9-2350-261-20-1 

1. Measure resistance between anywhere on terminal

block E4 (1) and power enclosure jack J26 outer

shell (2).

2. Does multimeter read 0 ohms?

1. Faulty lead 32C.

2. Notify your Supervisor.

3-226.88 Change 3
 TM 9-2350-261-20-1

1. Measure resistance between reversing contactor

RC1–REV terminal A2 (1) and reversing contactor

RC1-FWD terminal 52 (2).

2. Does multimeter read 0 ohms?

1. Faulty relay K4.

2. Notify your Supervisor.

GO TO NEXT PAGE

Change 3 3-226.89
TM 9-2350-261-20-1

1.

2.

Measure resistance between reversing contactor

RC1-FWD terminal 51 (1) and terminal 52 (2).

Does multimeter read 0 ohms?

1. Verify no faults found.

2. Raise faceplate (1) and secure with ten washers (2) and

screws (3).

1. Faulty reversing contactor.

2. Notify your Supervisor.

3-226.90 Change 3
TM 9-2350-261-20-1

NO POWER TO DC CIRCUITS

INITIAL SETU P

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

TM 11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is offl/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

.

Change 3 3-226.91

the operation of this
TM 9-2350-261-20-1 

1. Remove all external power from SICPS system

(see your -10 and TM 11-7010-256-12&P).

2. Remove ten screws (1) and lockwashers (2), and lower

faceplate (3) of Power Control Enclosure (4). Discard

lockwashers.

3. Remove twelve screws (5), lockwashers (6), and cover

(7) from front of Power Control Enclosure (4). Discard

lockwashers.

4. Set MASTER SWITCH to ON (see your -10).

5. Measure voltage between relay K6 (8) terminal 2 and

Power Control Enclosure jack J25 (9) negative

terminal.

6. Does multimeter read 22 volts DC or more?

1. Go to: Power Enclosure A1

DC Input/Output Inoperative (page 3-226.1). 

3-226.92 Change 3
TM 9-2350-261-20-1

1. Measure voltage between circuit breaker CB15 (1)

terminal 1 at DC bus bar and Power Supply PS1 output

negative terminal (2).

2. Does multimeter read 22 volts DC or more?

GO TO NEXT PAGE

1. Go to: Vehicle Batteries

Discharge with External AC

Power Applied

(page 3-226.69).

Change 3 3-226.93
TM 9-2350-261-20-1

1. Set MASTER SWITCH to OFF (see your -10).

2. Measure resistance of circuit 32C between Power

Control Enclosure jack J26 (1) and terminal block E4

terminal 2(2).

3. Does multimeter read 0 ohms?

1. Faulty lead 32C in Power

Control Enclosure.

2. Notify your supervisor.

3-226.94 Change 3
TM 9-2350-261-20-1

1. Remove the following cable plugs from jacks on Power

Control Enclosure:

W45 plug P13 (1) from jack J33 (2)

W10 plug P14 (3) from jack J34 (4)

W9 plug P15 (5) from jack J35 (6)

W32 plug P16 (7) from jack J36 (8)

2. Measure resistance of the following leads between

terminal block E4 (9) and the following jacks on Power

Control Enclosure:

Lead 32G to J33 (2) socket B

Lead 32H to J34 (4) socket B

Lead 32J to J34 (4) socket D

Lead 32L to J35 (6) socket B

Lead 32N to J35 (6) socket D

Lead 32P to J36 (8) socket B

3. Does multimeter read 0 ohms for all readings?

1. Faulty leads 32G, H, J, L,

N, and P in Power Control

Enclosure.

2. Notify your supervisor.

GO TO NEXT PAGE

Change 3 3-226.95
TM 9-2350-261-20-1 

1.

2.

3.

4.

Set MASTER SWITCH to ON (see your -10).

Set all DC CIRCUITS circuit breakers on Power Control Enclosure panel to ON.

Measure voltage between terminal block E4 (1) and the

following jacks on Power Control Enclosure:

J33 (2) socket A

J34 (3) socket A

J35 (4) socket A

J36 (5) socket A

Does multimeter read 22 volts DC or more for all

readings?

1. Install cover (1) on Power Control Enclosure (2) and

secure with twelve new lockwashers (3) and screws (4).

2. Raise faceplate (5) and secure to Power Control Enclosure (2) with ten new lockwashers (6) and screws (7).

3. Install the following cable plugs:

W45 plug P13 (8) on jack J33 (9)

W10 plug P14 (10) on jack J34 (11)

W9 plug P15 (12) on jack J35 (13)

W32 plug P16 (14) on jack J36 (15)

4. Verify no faults found.

1. Go to: Power Enclosure A1

DC Input/Output Inoperative (page 3-226.1).

3-226.96 Change 3
 TM 9-2350-261-20-1

NO POWER TO AC CIRCUITS

INITIAL SETU P

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital multimeter (Item 43, App D) TM 11-7010-256-12&P

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-generation Equipment Repairer 52D10

Helper (H) Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

operation of this

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with operation and hazards of equipment is nearby. That person should also be familiar

with giving first aid. When an operator

helps a mechanic, that operator must be

warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is OFF/disconnected.

BE CAREFUL not to touch high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.97
TM 9-2350-261-20-1

1. Turnoff all power from SICPS system (see your -10

and TM 11-7010-256-12&P).

2. Remove ten screws (1), lockwashers (2), and lower

faceplate (3) of power enclosure (4).

3. Measure resistance of circuit 17B between reversing

contactor reverse terminal T1 (5) and circuit breaker

CB10 terminal 1 (6). Also measure resistance of circuit

17A between terminal T1 and forward terminal T1 (7).

4. Does multimeter read 0 ohms for both readings?

1. Faulty lead 17A and/or lead

17B.

2. Notify your Supervisor.

3-226.98 Change 3
TM 9-2350-261-20-1

1. Measure resistance of circuit 18B between reversing

contactor reverse terminal T2 (1) and terminal block E3

terminal 1 (2). Also measure resistance of circuit 18A

between terminal T2 (1) and forward terminal T2 (3).

2. Does multimeter read 0 ohms for both readings?

GO TO NEXT PAGE

1. Faulty lead 18A and/or lead

18B.

2. Notify your Supervisor.

Change 3 3-226.99
TM 9-2350-261-20-1 

1. Remove plug P1 (1) from J30 (2).

2. Measure resistance of circuit 18N between power

enclosure jack J30 (2), socket B, and terminal block E3

(3). Also measure resistance for circuit 18K between

jack J30, socket D, and E3.

3. Does multimeter read 0 ohms for both readings?

1. Faulty lead 18N and/or lead

2. Notify your Supervisor.

3-226.100 Change 3

18K. 
TM 9-2350-261-20-1

1. Remove plug P11 (1) from J31 (2).

2. Measure resistance of circuit 18H between power

enclosure jack J31 (2), socket B, and terminal block E3

(3). Also measure resistance for circuit 18E between

jack J31, socket D, and E3.

3. Does multimeter read O ohms for both readings?

GO TO NEXT PAGE

1. faulty lead 18E and/or lead

18H.

2. Notify your Supervisor.

Change 3 3-226.101
TM 9-2350-261-20-1

1.

2.

3.

Remove plug P17 (1) from J37 (2).

Measure resistance of circuit 18D between power

enclosure jack J37 (2), socket B, and terminal block

E3 (3).

Does multimeter read 0 ohms?

3-226.102 Change 3

\ I -l =A /Jl- 1 Iv

1. Faulty lead 18D.

2 Notify your Supervisor. .
TM 9-2350-261-20-1

1. Set BLACKOUT ENABLE switch to upward position

(See TM 11-7010-256-12&P).

2. Measure resistance of circuit 20B between power

enclosure jack J37 (1), socket A, and BLACKOUT

ENABLE switch S1 (2), terminal 3.

3. Does multimeter read 0 ohms?

1. Faulty lead 20B.

2. Notify your Supervisor.

GO TO NEXT PAGE

Change 3 3-226.103
TM 9-2350-261-20-1

1.

2.

3.

Measure resistance of circuit 19B from terminal 2 (1) of

switch S1 (2) and A2 (3) of relay K5 (4).

Measure resistance of circuit 20A from terminal 3 (5) of

switch S1 (2) and A3 (6) of relay K5 (4).

Does multimeter read 0 ohms?

1.

2.

3.

Remove leads 19A and 19B from switch S1 positing 2.

Measure resistance with switch S1 (1) in both up and

down positions.

Does multimeter read 0 ohms when switch is down and

infinite ohms when switch is up?

1. Faulty leads 19B and/or

20A.

2. Notify your Supervisor.

1. Replace switch S1

(page 40.1-33).

2. Verify no faults found.

3-336.104 Change 3
1.

2.

3.

4.

TM 9-2350-261-20-1

Reconnect leads 19A and 19B to S1 position 2.

Set BLACKOUT ENABLE switch to upward position

(see TM 11-7010-256-12&P).

Measure resistance between terminal 2 (1) and terminal 3 (2) of BLACKOUT ENABLE switch S1 (3).

Does multimeter read infhite ohms?

GO TO NEXT PAGE

1. Faulty relay K5.

2. Notify your Supervisor.

Change 3 3-226.105
TM 9-2350-261-20-1

1. Measure resistance of circuit 19A between BLACKOUT ENABLE switch S1 (1), terminal 2. and circuit

breaker CB17 (2), terminal 2.

2. Does multimeter read 0 ohms for both readings?

3-226.106 Change 3

1. Replace lead 19A

(page 40.1-33).

2. Verify no faults found.
TM 9-2350-261-20-1

1. Set BLACKOUT ENABLE switch to down position.

2. Set AC LIGHTS switch in upward position (see

TM 11-7010-256-12&P).

3. Measure resistance between terminal 2 (1) and terminal 1 (2) of circuit breaker CB17 (3).

4. Does multimeter read 0 ohms?

GO TO NEXT PAGE

1. Replace circuit breakers

CB17 (page 40.1-33).

2. Verify no faults found.

Change 3 3-226.107
TM 9-2350-261-20-1

1.

2.

3.

Set AC LIGHTS switch in upward position (see

TM 11-7010-256-12&P).

Measure resistance of circuit 17C between circuit

breaker CB17, terminal 2 (1), and AC bus bar at CB9

(2) terminal 1.

Does multimeter read 0 ohms?

1.

2.

Verify no faults found.

Raise faceplate (1) and secure with 10 lockwashers

and screws (3).

(2)

3-226.108 Change 3

1. Replace lead 17C

(page 40.1-33).

2. Verify no faults found.
TM 9-2350-261-20-1

NO DC OUTPUT FROM DC POWER SUPPLY

INITIAL SETU P

Tools: References:

General Mechanic’s Tool Kit (Item 30, App D) See your -10

Digital Multimeter (Item 43, App D) TM 11-7010-256-12&P

See M1068 Wiring Diagram

Personnel Required: (FO-9 thru FO-11)

Power-Generation Equipment Repairer 52D10

Helper (H) Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your –10)

WARNING

HIGH VOLTAGE is used in

equipment.

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

GO TO NEXT PAGE

Change 3 3-226.109

the operation of this
TM 9-2350-261-20-1

1. Remove ten screws (1) and lockwashers (2), and lower

faceplate (3). Discard lockwashers.

2. Remove twelve screws (4), lockwashers (5), and cover

(6) from Power Control Enclosure (7). Discard

lockwashers.

3. Apply an external source of AC power

(TM 11-7010-256-12&P).

4. Set AC MAIN circuit breaker on Power Control

Enclosure panel to ON.

5. Is external source of AC power accepted by Power

Control Enclosure?

1. Go to: Vehicle Will Not

Accept External AC Power

(page 3-226.76).

3-226.110 Change 3
page 40.1-33

TM 9-2350-261-20-1

GO TO NEXT PAGE

Change 3 3-226.111
TM 9-2350-261-20-1

3-226.112 Change 3
3-226.113

TM 9-2350-261-20-1

Change 3
TM 9-2350-261-20-1

NO AC POWER FROM INVERTER S

INITIAL SETU P

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

Digital Multimeter (Item 43, App D)

Inverter Test Solo Plug (Fig 1, App E)

Personnel Required:

Power-Generation Equipment Repairer 52D10

Helper (H)

References:

See your -10

TM11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

WARNING

HIGH VOLTAGE is used in

the operation of this

equipment.

DEATH ON CONTACT may

result if personnel fail to

‘observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

3-226.114 Change 3
page 3-226.1

TM 9-2350-261-20-1

GO TO NEXT PAGE

Change 3 3-226.115
page 40.1-28.1

TM 9-2350-261-20-1

I. Remove ten screws (1), lockwashers (2), and cover (3)

from inverter housing (4). Discard Iockwashers.

2. Measure voltage between terminal E2 (5) on terminal

block TB1 (6) and ground.

3. Repeat measurement between terminal E4 (7) and

ground.

4. Does multimeter read 22 volts DC or more for both

measurements?

3-226.116 Change 3
TM 9-2350-261-20-1

1.

2.

3.

4.

Set MASTER SWITCH to OFF.

Tag leads E1 thru E5 before removal. Remove cable W5

leads (1) from posts on terminal block TB2 (2).

Measure resistance between sockets of plug P6 (3) and

W5 leads (1) as follows:

Socket A to lead E1

Socket B to lead E2

Socket C to lead E3

Socket D to lead E4

Socket E to lead E5

Does multimeter read 0 ohms for each measurement?

1. Replace cable W5 (page

40.1-62).

2. Verify no faults found.

GO TO NEXT PAGE

Change 3 3-226.117
TM 9-2350-261-20-1

1. Install cable W5 leads on terminal block TB2.

2. Remove cable W15 plugs (1) from inverters IN1 (2) and

IN2 (3).

3. Install inverter test solo plug (4) in inverter IN1 (2).

4. Set MASTER SWITCH to ON.

5. On inverter front panel (5), set POWER switch (6) to

ON and momentarily move RESET switch (7) up.

6. Measure voltage between sockets A and B of cable W5

plug P6 (8).

7. Does multimeter read 110 volts AC or more?

3-226.118 Change 3

1. Faulty inverter IN1 (with

solo plug installed).

2. Notify your supervisor.
TM 9-2350-261-20-1

1.

2.

3.

4.

5.

6.

Set MASTER SWITCH to OFF.

Remove solo plug (1) from tested inverter IN1 (2) and

install in other inverter IN2 (3).

Set MASTER SWITCH to ON.

On inverter front panel (4), set POWER switch (5) to

ON and momentarily move RESET switch (6) up.

Measure voltage between sockets C and D of cable W5

plug P6 (7).

Does multimeter read 110 volts AC or more?

1. Install cable W5 plug P6 (1) on Power Control

Enclosure jack J27 (2).

2. Replace cascade remote harness W15 (page 40.1-26).

3. Verify no faults found.

NO 1. Faulty inverter IN2 (with

solo plug installed).

2. Notify your supervisor.

Change 3 3-226.119
TM 9-2350-261-20-1

NO DATA OUTPUT FROM DATA PANEL A1 2

INITIAL SETU P

Tools:

Electronic Equipment Tool Kit

(Item 75.1, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Signal Support System Specialist 31U10

Helper (H)

References:

See your -10

TM11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your –10)

Carrier blocked (see your -10)

1. Remove cable W124 plug P1 (1) from Data Panel A12

jack J3 (2).

2. Measure resistance between posts(3) and pins of jack

J3 (2) as follows:

Post 1 (Red) to pin A Post 7 (Red) to pin N

Post 1 (Blk) to pin B Post 7 (Blk) to pin P

Post 2 (Red) to pin C Post S (Red) to pin R

Post 2 (Blk) to pin D Post 8 (Blk) to pin S

Post 3 (Red) to pin E Post 9 (Red) to pin T

Post 3 (Blk) to pin F Post 9 (Blk) to pin U

Post 4 (Red) to pin G Post 10 (Red) to pin V

Post 4 (Blk) to pin H Post 10 (Blk) to pin W

Post 5 (Red) to pin J Post 11 (Red) to pin X

Post 5 (Blk) to pin K Post 11 (Blk) to pin Y

Post 6 (Red) to pin L Post 12 (Red) to pin Z

Post 6 (Blk) to pin M Post 12 (Blk) to pin a

3. Does multimeter read 0 ohms for each measurement?

 2. verify no faults found. 

 1. Replace Data Panel A12 

3-226.120 Change 3

(page 40.1-4) 
TM 9-2350-261-20-1

1. Remove cable W 124 plug P109 (1) from Patch Panel

Box A10 jack J140(2).

2. Measure resistance between pin A on plug P109 (1) and

socket A on plug PI (3) of cable W124. Repeat for pins B

thru a

3. Does multimeter read 0 ohms for each measurement?

1. Replace Patch Panel Box A10 (page 40.1-21).

2. Verify no faults found.

1. Replace cable W124

(page 40.1-97).

2. Verify no faults found.

Change 3 3-226.121
TM 9-2350-261-20-1

NO LAN OUTPUT FROM DATA PANEL A 1 2

INITIAL SETU P

Tools:

Electronic Equipment Tool Kit

(Item 75.1, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Signal Support System Specialist 31U1O

Helper (H)

References:

See your -10

TM11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11

Equipment Conditions:

Engine stopped/shutdown (see your –10)

Carrier blocked (see your –10)

WARNING

HIGH VOLTAGE is used in

DEATH ON CONTACT may

result if personnel fail to

observe safety precautions.

NEVER work on equipment unless at

least one other person familiar with the

operation and hazards of the equipment

is nearby. That person should also be

familiar with giving first aid. When an

operator helps a mechanic, that operator

must be warned about dangerous areas.

SHUT OFF POWER supply to equipment

before beginning work. Make sure all

external power is off/disconnected.

BE CAREFUL not to contact high-voltage

connections when installing or operating

this equipment.

3-226.122 Change 3

the operation of this

equipment 
page 40.1-4

TM 9-2350-261-20-1

1. Remove cable W108 plugs P1 (1) and P2 (2) from Data

Panel A12 jacks J107 (3) and J108 (4).

2. Remove cable W107 plugs P1 (5) and P2 (6) from Data

Panel A12 jacks J105 (7) and J106 (8).

3. Measure resistance between center pins of plugs P1 and

P2 of each cable.

4. Does multimeter read 0 ohms for each measurement?

GO TO NEXT PAGE

Change 3 3-226.123
TM 9-2350-261-20-1

1. Remove the following cable plugs from jacks on Data

Panel A12:

W101 plug P1 (1) from jack J1 (2)

W103 plug P1 (3) from jack J2 (4)

W102 plug P1 (5) from jack J4 (6)

W104 plug P1 (7) from jack J5 (8)

2. Measure resistance between pins of the following jacks

on Data Panel A12:

J1 (2) to J105 (9)

J2 (4) to J106 (10)

J4 (6) to J107 (11).

J5 (8) to J108 (12)

3. Does multimeter read 0 ohms for each measurement?

1. Replace Data Panel A12

(page 40.1-4).

2. Verify no faults found.

3-226.124 Change 3
TM 9-2350-261-20-1

1. Measure resistance between cable W101 plug P1 (1)

and External Communication Box Al 1 jack J103 (2).

2. Measure resistance between cable W102 plug P1 (3)

and External Communication Box A11 jack J 104 (4).

3. Does multimeter read 0 ohms for each measurement?

1. Install the following plugs and cables on Data Panel

A12jacks:

W101 plug P1 (1) on jack J1 (2)

W103 plug P1 (3) on jack J2 (4)

W102 plug P1 (5) on jack J4 (6)

W104 plug P1 (7) on jack J5 (8)

W107 plug P1 (9) on jack J105 (10)

W107 plug P2 (11) on jack J106 (12)

W108 plug P1 (13) on jack J107 (14)

W108 plug P2 (15) on jack J108 (16)

2. Verify no faults found.

NO 1. Faulty cables W101 and/or

W102.

2. Notify your supervisor.

Change 3 3-226.125
page 40.1-5

TM 9-2350-261-20-1

NO DATA OUTPUT FROM DATA PANEL A1 3

INITIAL SETU P

Tools:

Electronic Equipment Tool Kit

(Item 75.1, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Signal Support System Specialist 31U10

Helper (H)

References:

See your -10

TM11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your –10)

1. Remove cable W 126 plug P1 (1) from Data Panel A13

jack J3 (2).

2. Measure resistance between posts (3) and pins of jack

J3 (2) as follows:

Post 1 (Red) to pin A Post 7 (Red) to pin N

Post 1 (Blk) to pin B Post 7 (Blk) to pin P

Post 2 (Red) to pin C Post 8 (Red) to pin R

Post 2 (Blk) to pin D Post 8 (Blk) to pin S

Post 3 (Red) to pin E Post 9 (Red) to pin T

Post 3 (Blk) to pin F Post 9 (Blk) to pin U

Post 4 (Red) to pin G Post 10 (Red) to pin V

Post 4 (Blk) to pin H Post 10 (Blk) to pin W

Post 5 (Red) to pin J Post 11 (Red) to pin X

Post 5 (Blk) to pin K Post 11 (Blk) to pin Y

Post 6 (Red) to pin L Post 12 (Red) to pin Z

Post 6 (Blk) to pin M Post 12 (Blk) to pin a

3. Does multimeter read 0 ohms for each measurement?

3-226.126 Change 3
TM 9-2350-261-20-1

1.

2.

3.

Remove cable W 126 plug P108 (1) from Patch Panel

Box A10 jack J139(2).

Measure resistance between pin A on plug P108 ( 1) and

socket A on plug P1 (3) of cable W126. Repeat for pins B

thru a

Does multimeter read 0 ohms for each measurement?

1. Replace Patch Panel Box A10 (page 40.1-21).

2. Verify no faults found.

NO 1. Replace cable W126

(page 40.1-100).

2. Verify no faults found.

Change 3 3-226.127
TM 9-2350-261-20-1

NO LAN OUTPUT FROM DATA PANEL A1 3

INITIAL SETU P

Tools:

Electronic Equipment Tool Kit

(Item 75.1, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Signal Support System Specialist 31U1O

Helper (H)

References:

See your -10

TM11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your –10)

Carrier blocked (see your -10)

3-226.128 Change 3
TM9-2350-261-20-1

1. Remove cable W109 plugs P1 (1) and P2 (2) from Data

Panel A13 jacks J109 (3) and J110 (4).

2. Remove cable W110 plugs P1 (5) and P2 (6) from Data

Panel A13 jacks J111 (7) and J112 (8).

3. Measure resistance between center pins of plugs P1 and

P2 of each cable.

4. Does multimeter read 0 ohms for each measurement?

NO 1. Replace cable W109 and/or

W110 (page 40.1-5).

2. Verify no faults found.

GO TO NEXT PAGE

Change 3 3-226.129
TM 9-2350-261-20-1

1. Remove the following cable plugs from jacks on Data

Panel A13:

W32 plug P5 (1) from jack J1 (2)

W104 plug P2 (3) from jack J2 (4)

W32 plug P4 (5) from jack J4 (6)

W103 plug P2 (7) from jack J5 (8)

2. Measure resistance between pins of the following jacks

on Data Panel A13:

J1 (2) to J12 (9)

J2 (4) to J111 (10)

J4 (6) to J110 (11).

J5 (8) to J109 (12)

3. Does multimeter read 0 ohms for each measurement?

3-226.130 Change 3

1. Replace Data Panel A13

(page 40.1-5).

2. Verify no faults found.
3-226.131

page 40.1-94

TM 9-2350-261-20-1

1. Remove cables W103 plug P1 (1) and W104 plug P1 (2)

from jacks J2 (3) and J5 (4) on Data Panel A12.

2. Measure resistance between center pins of plugs P1 and

P2 of cables W103 and W104.

3. Does multimeter read 0 ohms for each measurement?

1. Go to: No LAN Output from Data Panel A12

(page 3-226.122).

Change 3
TM 9-2350-261-20-1

PHONE EXTENSION BOX A14 POST(S) INOPERATIV E

INITIAL SETU P

Tools:

Electronic Equipment Tool Kit

(Item 75.1, App D)

Digital Multimeter (Item 43, App D)

Personnel Required:

Signal Support System Specialist 31U10

Helper (H)

References:

See your -10

TM11-7010-256-12&P

See M1068 Wiring Diagram

(FO-9 thru FO-11)

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

3-226.132 Change 3
TM 9-2350-261-20-1

Change 3 3-226.133

GO TO NEXT PAGE 
TM 9-2350-261-20-1

1. Remove cable W129 plug P1 (1) from Tent Interface

Panel jack J137 (2).

2. Measure resistance between pin A on plug P1 (1) and

socket A on plug P2 (3) of cable W 129. Repeat for pins B

thru a

3. Does multimeter read 0 ohms for each measurement?

3-226.134 Change 3

NO 1. Replace cable W129.

2. Verify no faults found.
TM 9-2350-261-20-1

1.

2.

3.

4.

Remove cable W32 plug P7 (1) from Tent Interface

Panel jack J8 (2).

Measure resistance between socket A of jack J137 (3)

and pin A of jack J8 (2). Repeat for sockets/pins B

through a.

Measure resistance between sockets of J137 (3) and

posts (4) as follows:

Socket A to E117

Socket B to E118

Socket C to E119

Socket D to E120

Does multimeter read 0 ohms for each measurement?

GO TO NEXT PAGE

NO 1. Replace Tent Interface Panel

Box A5 (page 40.1-46).

2. Verify no faults found.

Change 3 3-226.135
TM 9-2350-261-20-1

1.

2.

3.

Remove cable W32 plug P107 (1) from jack J138 (2) on

Patch Panel Box A10.

Measure resistance between socket A of plug P7 (3) and

pin A of plug P107 (1). Repeat for socket/pins B

through a.

Does multimeter read 0 ohms for each measurement?

1. Replace Patch Panel Box A10 (page 40.1-21).

2. Verify no faults found.

1. Replace cable W32

(page 40.1-78).

2. Verify no faults found.

3-226.136 Change 3
PAGE 3-229

TM 9-2350-261-20-1

SPEEDOMETER MALFUNCTION S

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door opened

(see your -10)

Driver’s power plant access panel removed

(page 24-25)

Power plant front access cover removed

(page 24-24)

1. Does speedometer fail to give any reading?

1. Remove speedometer cable (1) from speedometer (2).

2. Check speedometer drive (3).

3. Does speedometer drive spin freely?

NO 1. Replace speedometer

(page 11-16).

2. Verify no faults found.

GO TO NEXT PAGE

3-227
TM 9-2350-261-20-1

1. Remove speedometer cable (1) and packing (2) from

final drive adapter (3).

2. Check speedometer cable ends (4).

3. Does cable spin freely?

YES

1. Remove speedometer drive adapter from final drive

(page 11-17).

3. Is final drive adapter seized or damaged? 

1. Install speedometer cable on speedometer.

2. Replace final drive adapter (page 11-17).

3. Verify no faults found.

1. Repair or replace

speedometer cable

(page 11-17).

2 Verify no faults found.

NO . 1. Replace speedometer

(page 11-16).

2. Verify no faults found.

3-228

2. Inspect final drive adapter .
TM 9-2350-261-20-1

1. Has speedometer cable flexible core been serviced? 1. Service speedometer cable

flexible core (page 11-17).

2. Verify no faults found.

1. Inspect speedometer cable assembly (1) for damage

between speedometer (2) and final drive (3).

2. Is cable assembly free of damage?

1. Replace speedometer (page 11-16).

2. Verify no faults found.

1. Replace speedometer cable

assembly (page 11-17).

2. Verify no faults found.

3-229 
TM 9-2350-261-20-1

TACHOMETER MALFUNCTION S

INITIAL SETU P

Tools: Equipment Conditions:

General Mechanics Tool Kit (Item 30, App D) Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Personnel Required: Trim vane lowered (see your -10)

Unit Mechanic Power plant front access door opened

Helper (H) (see your -10)

Drivers power plant access panel removed

References: (page 24-25)

Power plant front access cover removed

see your -lo (page 24-24)

Crew compartment power plant access panel

removed (see your -10)

1. Start engine (see your -10).

2. Does tachometer fail to show any reading? GO TO PAGE 3-232

1. Stop engine (see your -10).

2. Remove tachometer cable (1) from tachometer (2).

3. Start engine (see your -10).

4. Observe tachometer cable drive tip (3).

5. Does tachometer cable drive tip fail to rotate?

1. Stop engine (see your -10).

2. Replace tachometer

(page 11-13).

3. Verify no faults found.

3-230
TM 9-2350-261-20-1

1. Inspect tachometer flexible core?

2. Is flexible core serviceable?

1. Remove tachometer adapter (1) from engine

(page 11-14).

2. Is tachometer adapter serviceable?

2. Report problem to supervisor.

NO 1. Repair/replace tachometer

cable assembly

(page 11-14).

2. Verify no faults found.

1. Replace tachometer adapter

(page 11-14).

2. Verity no faults found.

 1. Faulty engine drive. 

3-231 
TM 9-2350-261-20-1

1. Does tachometer fail to give a steady reading? NO 1. Replace tachometer

(page 11-13).

YES

2. Verify no faults found.

1. Has tachometer cable flexible core been serviced? NO

YES

1. Repair/replace tachometer cable assembly

(page 11-14).

2. Verify no faults found.

1. Service flexible core

(page 11-14).

2. Verify no faults found.

3-232
TM 9-2350-261-20-1

CHEMICAL AGENT AUTO ALARM MALFUNCTION S

INITIAL SETU P

Tools References:

General Mechanics Tool Kit (Item 30, App D) see your -lo

Digital Multimeter (Item 43, App D) TM 3+665-22&12

Personnel Required: Equipment Conditions:

Unit Mechanic Engine stopped/shutdown (see your -10)

Operator’s manual troubleshooting performed

(TM3-6665-225-12)

1.

2.

3.

Remove wiring harness plug (1) from junction box

jack (2).

Measure voltage at junction box jack between 6C

pos (+) pin E (3) and 7C neg (-) pin B (4).

Does multimeter read less than 17 volts?

1. Remove two screws (1) and pull junction box (2)

away from bulkhead.

2. Measure voltage between terminal 6C (3) on

circuit breaker and ground.

3. Does multimeter read less than 17 volts?

N O 1. Faulty detector. Notify

your supervisor.

1. Repair wiring harness

12313234 (page 14-3).

2. Verify no faults found.

GO TO NEXT PAGE

3-233 
TM 9-2350-261-20-1

1. Measure voltage between terminal 6B (1) on

circuit breaker and ground.

2. Does multimeter read less than 17 volts?

YES

1. Remove battery box cover.

2. Remove 6B pos (+) and 7B neg (-) terminal from

battery post.

3. Measure resistance between 6B pos (+) (1) terminal

from battery and circuit breaker.

4. Measure resistance between 7B neg (-) (2) terminal

from battery and circuit breaker.

5. Does multimeter read 0 ohms for either measurement?

1. Replace circuit breaker

(page 44-2).

2. Verify no faults found.

1. Replace cable assembly

11647667 (page 44-6).

2. Verify no faults found.

3-234 
TM 9-2350-261-20-1

1. Install a jumper wire on wiring harness 12313234

(1) connector between pins A (2) and D (3) on

cable assembly 11647665 (4).

2. Measure resistance between circuits 509B (5) and

509C (6) at M42 alarm.

3. Does multimeter read 0 ohms?

1. Remove jumper wire.

2. Repair cable assembly

11647665 (page 14-3).

3. Verify no faults found.

 1. Faulty M42 alarm. Notify your supervisor.

3-235
TM 9-2350-261-20-1

3-236 Change 4
TM 9-2350-261-20-1

Section III. STE/ICE-R TROUBLESHOOTING

TASK INDEX

Task Page Task

STE/ICE-R TESTING SYSTEM

STE-ICE-R Procedures . . . . . . . . . . . . . . . . 3-237

STE/ICE-R Charging Circuit

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 3-256

STE/ICE-R Starter Circuit

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 3-259

STE/ICE-R Low Oil Pressure

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . 3-264

STE/ICE-R Battery Troubleshooting 3-266

STE/ICE-R Engine Will Not Crank

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 3-270

STE/ICE-R Engine Will Crank But

Will Not Start Troubleshooting . . . . . . . 3-271

STE-ICE-R HOOK UP

Hook Up/Remove STE/ICE-R for

Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-275

Hook Up/Remove STE/ICE-R for

Engine RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-277

Hook Up/Remove STE/ICE-R for

Starter Circuit Tests . . . . . . . . . . . . . . . . . . . 3-279

Hook Up/Remove STE/ICE-R Test

Set for Test Numbers 72 Thru 75 . . . 3-281

Page

STE-ICE-R TESTS

STE-ICE-R Test 01 Display Engine

RPM With Next Measurement . . . . . . . . 3-283

STE/ICE-R Test 10 Engine RPM . . . . 3-284

STE/ICE-R Test 13 Power

(Percent) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-285

STE/ICE-R Test 14 Compression

Unbalance (Power Cable) . . . . . . . . . . . . . . 3-287

STE/ICER Test 67 Battery Voltage 3-289

STE/ICE-R Test 72 Starter Current

(First Peak) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-290

STE/ICE-R Test 73 Battery

Resistance - STE/ICE-R Test 75

Battery Resistance Change (Pack) . . . 3-291

STE/ICE-R Test 74 Starter Circuit

Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-293

STE/ICE-R Test 90 DC Current

0 to 1500 Amps . . . . . . . . . . . . . . . . . . . . . . . . . 3-294

Change 4 3-236.1 (3-236.2 blank)

TM 9-2350-261-20-1

STE/ICE-R PROCEDURES (SIMPLIFIED TEST EQUIPMENT FOR

INTERNAL COMBUSTION ENGINES REPROGRAMMABLE)

GENERA L

a. STE/ICE-R a testing system for internal combustion engines, provides measurements on voltage

resistance, pressure, temperature and speed to analyze the condition of an engine system.

b. This section provides a general overview of STE/ICE-R equipment anti operations, along with specific

procedures in diagnosing and isolating malfunctions of the M113A2, M577A2, M106A2, M125A2,

M741A1, M901A1, or M1059 engine.

c. STE/ICE-R will also provide a thorough preventative maintenance check on M113A2, M577A2,

M106A2 M125A2 M741A1, M901A1, or M1059 engine as part of service upon receipt and as an

annual check in the PMCS.

DESCRIPTION OF STE/ICE-R EQUIPMENT

a. The STE/ICE-R set consists of a vehicle test meter (VTM), five cable assemblies, transducer kit (TK),

manual, test probe kit and transit case.

Change 4 3-237
TM 9-2350-261-20-1

(1) Vehicle test meter (VTM). The VTM is the diagnostic meter of STE/ICE-R used for testing electrical and

mechanical components of the M113A2, M577A2, M106A2, M125A2, M741A1, M901A1, or M1059

engine. The VTM consists of 3 switches, a readout display, flip cards and 4 cable connectors.

(a) Switches. The three switches are a PUSH ON/PULL OFF switch, TEST SELECT switch and TEST

button. The PUSH ON/PULL OFF’ switch is used to control power to the VTM from the power source.

The TEST SELECT switch are two ten-position switches used to select the test to be performed. The

TEST button has two functions: (1) when pressed and rebased it initiates selected test; (2) pressed

and held it initiates an offset test.

(b) Readout display. The readout display gives five different types of messages during testing and up to a

maximum of four characters per message. The types of messages are:

● error

● status

● numerical

● prompting

● confidence test error

Readout display messages can be found on page 3-3.

(c) Flip cards. The flip cards, attached to the front of the VTM, provide a quick but limited reference for

the operator. These flip cards list test numbers, messages, and some procedures. Test limits are also

provided for some vehicles.

3-238 Change 1
TM 9-2350-261-20-1

(d) Cable connectors. The four cable connectors on the VTM are DCA/PWR J1, transducer cable

connectors J2TK and J3TK and VOLTS/OHMS J4.

. DCA/PWR connector J1 — used to connect VTM to either a vehicle diagnostic connector with

the DCA cable W1 or to a DC power source with the power cable W5. The DC power source is

usually the vehicle’s batteries.

. Transducer cable connectors J2 TK and J3 TK — used to connect transducer cables W4 to

VTM. Power and signals are routed through these connectors. Both connectors may be used

when a test requires two measurements to be made at the same time.

l V0LTS/OHNS connector J4 — used to connect test probe cable W2 to VTM for voltage and

resistance tests.

(2) Cable assemble, In procedures in this manual, the cable assemblies are referred to by a number for quick

identification. Each cable also has a name which describes its use. A reference to W 1, for example, would

indicate the DCA cable. Connectors on the cable are identified by a number preceded by either a P or an E,

such as P1 or E2.

The cable assemblies included in the STE/ICE-R are:

• w1 — DCA cable

•w2 — test probe cable

•w3 — ignition adapter cable

•w4 — transducer cable (two)

•w5 — power cable

Change 1 3-239
TM 9-2350-261-20-1

(2) Cable assemblies — continued

When cables are connected, the large key (1) located by the white stripe (2) on the cable connector mates with

large keyway (3) of connector on VTM or transducer.

(a) Diagnostic Connector assembly Cable W1 iS used to power the VTM and provide access to test

points and sensors connected to vehicle/equipment mounted DCA.There is no DCA capability in the M113A2

FOV presently.

(b) Test probe cable w2.The test probe cable for both general and special measurements. It is used for

measuring voltages, frequency, resistance and continuity, and also for the first peak series and compression

unbalance tests. W2 is divided into two color coded leads, red for E1 and black for E2. Test clips El and E2 of

W2 attach to points on the vehicle/equipment being tested.

(c) Ignition adapter cable W3. The ignition adapter cable W3 is used in measuring dwell angle, points

voltage, engine rpm and power tests. W3 is divided into two color coded leads, red for E 1 and black for E2.

Cable W3 is not used in the M113A2 FOV.

(d) Transducer cables W4. The transducer cables W4 are used as extensions to connect the VTM to a

pressure transducer, pulse tachometer, current probe or ignition adapter cable. If necessary, two transducer

cables can be joined using connector adapter, TK item 29.

3-240 Change 1
TM 9-2350-261-20-1

(e)Power cable W5. The power cable W5 is used to power the VTM when cable W1 is not being used. Cable

W5 is divided into two leads with color coded clips, red for E1 and black for E2. Battery clips E1 and E2 are

attached to a vehicle/equipment battery or a 9 to 32 volt 4A regulated power supply. Do not connect the VTM

to a battery charger. Damage to the VTM may result.

(3) Transducer kit(TK). The transducer kit is a tray inside the transit case that (TK) contains transducers,

adapters, and fittings. The TK is stored in a molded tray in the top of the transit case.

Many of the fittings do not have part number markings on them and are referred to by TK Item Number and

name. Each fitting is identified by TK item number and part number.

(4) Manual. TM 9-4910-571-12&P contains operating instructions, operator and organizational maintenance instructions, and repair parts and special tools information.

(5) Transit case. The STE/ICE-R is housed in a portable protective transit case which contains all necessary

accessories and instructions.

A pressure relief valve located on the front of the case allows the operator to release any pressure or vacuum

resulting from changes in climate during transit.

Change 1 3-241
TM 9-2350-261-20-1

READOUT DISPLAY MESSAGE S

a. Error messages. Error messages indicate the VTM needs additional or corrected information before testing 

can continue or additional procedures are required.

All error messages are displayed as an E followed by three numbers (for example, E003).

Display

E000

E001

E002

E003

E004

E005

E007

E008

E009

E010

E011

E012

E013

E014

E015

E017

Meaning

VTM has been asked for information that it does not have. For example, you have

requested the vehicle/equipment ID and it has not been entered.

A test number which does not exist has been entered on the TEST SELECT switches.

The required transducer is not connected.

Test number wrong for DCA connected. This can occur if test selected does not apply to

the class of vehicle/equipment under test or if the DCA harness does not have the

required transducer.

No longer used. If message appears turn in test set.

Required offset test was not performed.

The VID number and number-of-cylinders information entered do not agree.

VTM is not receiving required voltage signal for selected test. This message can occur on

tests, 14, 15, and 72 through 79.

VTM is not receiving engine speed signal. This applies only to engine power test and SI

full power simulation.

A wrong VID) number was entered. The VTM will only accept numbers between 01 and

99. If E010 is displayed when the VID entered was between 01 and 99, it means that

the VID) does not agree with the identity of the DCA harness powering the VTM. The

VTM will accept this, allowing you to power through the DCA while testing another

vehicle.

Throttle control was operated incorrectly. It was taking too long to accelerate or decelerate

during power test.

The SI ignition adapter, TK item 30, or CI pulse tachometer, TK item 34, is missing or

is not connected to the VTM.

VTM is unable to use data received.

The wrong number of cylinders was entered.

No longer used. If message appears, turn in test set.

VTM is not receiving ignition information during dwell test.

3-242 Change 1
E018

E020

E021

E022

E023

E024

E027

E028

E030

E032

E033

TM 9-2350-261-20-1

Test discontinued due to no information being detected by VTM. This will occur after

several minutes of no-signal operation.

No first peak information was detected by the VTM.

VTM cannot calculate result. Current is over current probe’s range, and VTM did not

sample correct portion of data.

External voltage was detected in the circuit under test while measuring resistance.

VTM’s constant voltage source is not working.

Test is not valid for VID entered.

Error in entry of compression unbalance constants.

Test just entered cannot be used with control function 06.

VID entered conflicts with speed transducer attached.

Vehicle’s cranking speed is varying too much for a compression unbalance measurement.

Error in entry of power test constants.

b. Status messages. Status messages keep the operator informed of what is happening.

Display

.8.8.8.8

.9.9.9.9

PASS

FAIL

CON

AUE

LO

Meaning

There is power to the VTM and the display is working properly. This appears only for a

short period after power is turned on.

VTM is reading a test value beyond its range.

Unit under test has passed test, or VTM has accepted a control function entry.

Unit under test has failed test.

Accepted control function input.

Numerical display is an average value.

Engine speed below 1600 rpm during SI power test indicates the engine failed the power

test.

VTM is busy.

c. Numerical readouts. Unit of measurement (psi, rpm, Volts, etc.) are not displayed. Numerical readouts

indicates the measured valve in units of the measurement being made. For example, if you are measuring

0-45 volts dc, 12.7 is volts dc. If you are measuring 0-25 psig pressure 12.7 is psig. The units for each test

are listed on the flip cards. Also the readout when undulating vehicle identification data (VID).

Change 1 3-243
TM 9-2350-261-20-1

d. Prompting messages. Prompting messages tell the operator to do something. After the operator action is

completed, testing will continue. Some of the prompting messages and their meanings are as follows:

Display Meaning

UEH Tells the operator to enter VID on the TEST SELECT switches.

CYL Tells the operator to enter the number-of-cylinders into the VTM.

GO Tells the operator to crank engine.

0066 Tells the operator to set TEST SELECT switches to 99 during confidence test.

CAL Tells the operator to release the TEST button during an offset test.

CIP Tells the operator to apply full throttle in a CI power test.

e. Confidence test error messages. Confidence test messages are displayed either as PASS or by a C followed

by three numbers (#). A C### is an error message used by VTM repair personnel as an aid in

troubleshooting.

If a C### message appears during confidence test or during normal operation, go to confidence test fault

isolation, TM 9-4910-571-12&P, for the necessary corrective action.

TEST METHOD

The test method consists of a pre-test inspection and STE/ICE-R testing.

a. Pre-test inspection. Before using STE/ICE-R to test the vehicles, perform the following pre-test

inspections:

(1) Fan Belts. Check for proper tension. Replace if cracked or frayed.

(2) Oil Level. Bring up to proper level if low.

(3) Fuel Level. Check that the fuel tank has enough fuel for testing.

(4) Radiator. Bring up to proper level if low.

(5) Battery. Replace the battery if the case is cracked or the terminal posts are damaged. Clean off all

corrosion. Check that the battery connections to ground and to starter motor are in good condition,

securely connected, and clean. Check the electrolyte level (see TM 9-6140-200-14). If low, bring up to

proper level with distilled water.

b. Vehicle test card (VTC). Once familiar with STE/ICE-R testing procedures the vehicle test card (located on

page 3-248) can be used as a quick reference.

The front of the test card contains all of the information, in abbreviated format, that the user will need to

perform common measurements on the vehicle. The organization from the top of the card to the bottom

represents a logical order of steps from powering up the VTM to completing a series of tests.

The top of the card describes the power up sequence of STE/ICE-R for the vehicle. Next, a table is provided

which lists many measurements that are useful in troubleshooting the vehicle. The table includes: the

3-244 Change 4
TM 9-2350-261-20-1

associated VTM test number, any required offset test limits, operating condition of the engine, special

connections required, the expected limits for pass or fail, and the units of measurement. Also included on the

front of the card are hook-up diagrams.

The organization of the table allows measurements with the vehicle engine turned off to be performed first.

These measurements will ensure that the starting system of the vehicle is in working order before proceeding.

The order of the other measurements is as follows:

. Measurements with the engine running but not warm

. Measurements requiring the engine to be warm and running

. Measurements requiring the engine to be warm and not running

. Miscellaneous measurements

The back of the VTC contains the hookups for measurements used to troubleshoot vehicle components.

Measurements that require special hookups are also included on this side of the VTC.

To start the test method, first perform the pre-test inspection and then the charging system operational check

on page 3-64.4.

STE/ICE-R ENGINE TROUBLESHOOTING METHO D

When a malfunction in the engine is recognized by the mechanic, the “flip cards to Troubleshooting” will

provide a reference to a specific procedure to isolate the cause of the malfunction.

To start the STE/ICE-R engine troubleshooting method do the following:

a. Perform Hook up. First, perform HOOKUP to set up STE/ICE-R and check to see if it is in working

order.

b. Perform procedurec Now that STE/ICE-R is hooked up properly and checks out, perform the procedure

cited in the “Quick Guide to Troubleshooting.”

The rules to follow when using STE/ICE-R engine troubleshooting method are:

(1) Never enter in the middle of a procedure.

(2) Follow each instructiom in a procedure. Do not skip any instructions or procedures.

(3) after correction a problem with a procedure, test run the component, engine or powerplant to ensure

the problem does not still exist.

BATTERY TEST CARD S

The STE/ICE-R battery test procedures allow the user to evaluate the condition and state of charge of

vehicle/equipment batteries. These procedures use the battery internal resistance and battery resistance

change measurements. Battery internal resistance evaluates the state of charge of the battery. Battery

resistance change evaluates the battery condition.

Battery state of charge is a measure of the amount of energy stored in the battery. A fully charged battery

contains the maximum amount of energy stored. If the batteqy fails the battery state of charge evaluation, the

battery may be recharged to return the battery to fti charge.

Change 1 3-245
TM 9-2350-261-20-1

The battery condition is a measure of the battery’s ability to accept and maintain a good charge. A battery in

poor condition may be able to be fully recharged. However, a battery in poor condition with a full charge will

lose its charge more quickly than a battery in good condition with a full charge. If a battery fails the battery

condition evaluation, then the battery should be replaced.

The procedures for testing batteries are listed on three battery test cards. Each card describes procedures for

evaluating different combinations of batteries:

• Complete battery pack

• Series pair of batteries

• Individual batteries

BATTERY PACK S

A battery pack is the combination of four of more batteries in a particular circuit of a vehicle/equipment, i.e.

the starting circuit. Testing the batteries in a pack evaluates the general condition of the pack as a whole.

Note, the results of a battery pack test may be misleading. A single battery from a pack of four may be bad

even though the pack as a whole may pass the tests. This can happen if the other three batteries in the pack

are in very good condition. In order to test a battery pack, the current probe must be clamped around a single

cable carrying all of the starter current. If such a connection cannot be made, then test each pair of batteries

separately.

SERIES PAIR S

A series pair is one in which the negative terminal of one battery is connected by a cable to the positive

terminal of another battery. This test configuration should be used when any of the following conditions exists:

• There are only two batteries (one series pair) in the vehicle/equipment.

• An evaluation of the pack is desired, but the current probe cannot measure the total starter

current. This condition can occur if the cable is not readily accessible or if the cable is physically

too large.

• The battery pack test has failed, and the user wants to further identify any bad battery pair.

• Note, testing each series pair yields a better evaluation than testing the pack as a whole.

INDIVIDUAL BATTERIE S

An individual battery test refers to the process of testing one battery at a time. The battery could be part of a

pack, a series pair, or a single battery. Test the batteries individually if a battery series pair failed the tests

and it is desired to isolate to a single battery (or if there is only one battery in the circuit). Testing individual

batteries gives the best evaluation.

DESCRIPTION OF TEST CARD S

The front of each test card has three sections. The top of the card explains how to connect the VTM to the

batteries being tested. The middle part of the card describes the procedure to follow in order to evaluate the

batteries. The bottom of the card contains illustrations showing typical vehicle hookups.

3-246 Change 1
3-247

TM 9-2350-261-20-1

The back of each card also has three sections. The upper left–hand block lists the possible VTM displays and

explains their meanings. This block suggests corrective action for the user. The right–hand side of the card

contains battery test limits for three common military batteries. These limits may be used if the

vehicle/equipment TM does not provide limits. The lower left-hand portion of the card contains a table

showing how to apply the limits to evaluate the battery condition and state of charge.

BATTERY EVALUATION PROCEDUR E

1. Use procedures on battery test card to hook-up VTM. The following information will enable the user

to determine the correct tests:

a. Use

(1)

(2)

(3)

b. Use

(1)

(2)

(3)

2. Use

test series 73 and 75 for the following conditions:

Testing a battery pack that is also powering the VTM

Testing a battery series pair that is also powering the VTM

Testing an individual battery that is the only battery in the circuit and is powering the VTM

test series 77 and 79 for the following conditions:

Testing a battery pack that is not powering the VTMTesting a battery series pair that is not powering the VTM

Testing an individual battery that is not the only battery in a circuit or is not powering the VTM

test procedure on battery test card to complete evaluation.

a. Evaluate battery condition using battery resistance change test (#75 or #79). Note the result.

b. Evaluate battery state of charge using the battery internal resistance test (#73 or #77). Note the result.

c. Compare test results to limits in vehicle/equipment TM. If vehicle/equipment TM does not have test

limits, use test limits provided in this section. If the battery internal resistance test passes, then the

batteries are fully charged. If the battery internal resistance test fails, then the batteries are not

adequately charged. If the battery resistance change test passes, then the batteries are good and will retain

their charge. If the battery resistance change test fails, then the batteries are bad and will not retain their

charge.

d. If batteries are out of limits, perform one or all of the following:

(1)

(2)

(3)

(4)

Check battery electrolyte level.

Check battery connections and terminals. Clean or tighten if necessary. Check connections between

VTM and batteries.

Refer to vehicle/equipment TM to check battery specific gravity.

Repeat battery resistance change and internal battery resistance tests one time. If internal battery

resistance result (test #73 or #77) is out of limits, then charge batteries. If battery resistance change

result (test #75 or #79) is out of limits, then continue testing to isolate bad batteries.

Change 1
TM 9-2350-261-20-1

M113 VEHICLE TEST CARD - VID 0 3

3-248 Change 1
TM 9-2350-261-20-1

M113 VEHICLE TEST CARD - VID 03 Additional Test Connection s

Test limits given are advisory only and are not necessarily the same as vehicle TM’s specifications

if test Iimits are different use vehicle TM’s specificatlons.

Change 1 3-249 
TM 9-2350-261-20-1

M113 VEHICLE TEST CARD - VID 03 Additional Test Connections

Test limits given are advisory only and are not necessarily the same as vehicle TM’s specitications. If test Iimits are different.

use vehicle TM’s specifications.

3-250 Change 1
TM 9-2350-261-20-1

STE/ICE BATTERY SERIES PAIR TEST CAR D

THE BATTERY INTERNAL RESISTANCE TEST (73 or 77) evaluates the state of charge of the battery series pair. The BATTERY RESISTANCE

CHANGE TEST (75 of 79) evaluates whether the battery is good or bad, even if it is discharged A good battery that is discharged may be recharged. A

bad battery may hold a charge for a short time.

STE/ICE HOOKUP

1. The power to operate the STE/ICE VTM may be taken from the batteries being tested as shown in the appropriate figure below or from a

alternate power source (such as another vehicle’s batteries).

2. Perform VTM general setup, run confidence test, and enter vehicle ID.

3. Find a series pair of batteries. A battery series pair has the negative terminal of one battery connected to the positive terminal of another

battery by a cable. For example. in figures 1 and 2 below. batteries A and B are l series pair; and in figure 1 below batteries C and D are a

series pair.

4. a If power to the VTM comes from a different set of batteries than the batteries under test, use tests77 and 79 instead of tests 73 and 75 Connect

test probe cable W2 to the batteries under test. Connect the red clip to the positive terminal closest to the starter and the black clip lead to the

negative terminal closest lo the ground

b. II power to the VTM comes from the same set of batteries as the batteries under test. use tests 73 and 75. The test probe cable W2 is not used

5. Clamp the current probe around the cable connecting the two batteries. Point the arrow of the current probe along the cable leading towards the

negative battery terminal as shown below in figures 1 and 2 for batteries A and B.

TEST PROCEDURE

1. Condition the current probe before running these tests.

2. Measure the battery resistance change by entering test number 75 or 79 (as described in the hookup procedure). Thenengage the starter for about

5 seconds.

3 Measure battery internal resistance by entering test number 73 or 77 (as described in the hookup procedure) Then engage the starter for about

4. Compare the results of both measurements to limits in the vehicle/equipment TM or to limits on the reverse side of this card.

5 If either measurement is outside of normal limits, check battery terminals and connections. and check. battery electrolyte level. Then perform both

measurements a second time.

6. If the battery resistance change test (75 or 79) fails after the second measurement, then the battery series pair is in bad condition. Test each battery

individually to determine which is good and which is bad or replace the battery series pair.

7. II the battery internal resistance test (73 or 77) fails alter the second measurement, then the batteries should be recharged.

Change 1 3-251
TM 9-2350-261-20-1

STE/ICE INDIVIDUAL BATTERY TEST CARD

STE/ICE DISPLAY

AFTER TEST

WHAT IT MEANS

1. The battery in series with the battery under test may be bad.

Check that battery next.

GO.. . . . . . . . . .

.9.9.9.9 ......... .

14.2....... .............

E013 .............

2. There is a bad connection in the starter circuit somewhere.

Check the battery negative cables, and cables to the starter for

corroded or loose connections. If all of the cables and connections are o.k., then the starter is possibly faulty.

 2. The battery under test is in extremely poor condition.

If any number is displayed, then the number is a STE/ICE test

result. Compare the test result to the values shown along the right

edge of this card to determine a pass or fail. See table below to

determine the condition of the battery.

 1. The battery being tested may be in a discharged state. Check

battery electrolyte level; charge battery, and then retest.

2. If display shows E013 after battery has been charged, then the

battery is in poor condition.

E002 ............... The current probe is not connected. Connect current probe.

E005 . . . . . . . . . . . . . . . . . . . . Offset test for current probe has not been performed. Perform

current probe offset lest.

E008 . . . . . . . . . . . . . . . . . . . Test leads are improperly connected. Check test leads.

1. There is a bad connection on the battery being tested. Clean and

tighten the posts and clamps, and check the cable between the

batteries.

TEST 77 TEST 79

BATTERY INTERNAL RESISTANCE BATTERY RESISTANCE CHANGE BATTERY CONDITION

TEST RESULT TEST RESULT

PASS PASS

The battery tested is o.k.

and in good state of change.

PASS FAIL

The battery tested is in poor

condition, but has a fresh

charge.

FAIL PASS

The battery tested is o.k..

but needs to be recharged.

FAIL FAIL

The battery tested is in poor

condition and in a state of

discharge.

3-252 Change 4
Change 1 3-253 

TM 9-2350-261-20-1

STE/ICE INDIVIDAL BATTERY TEST CARD
TM 9-2350-261-20-1

STE/ICE INDIVIDUAL BATTERY TEST CAR D

The BATTERY INTERNAL RESISTANCE TEST (73 or 77) evaluates the state of charge of an individual battery The BATTERY RESISTANCE

CHANGE TEST (75 or 79) evaluates whether the battery IS good or bad, even if It is discharged A good battery that IS discharged bay be recharged A

bad battery may hold a charge for a short time

STE/lCE HOOKUP

1 . The power to operate the STE/lCE VTM maybe taken from the batteries being tested as shown In the appropriate figure below or from an alternate

power source (such as another vehicle’s batteries).

2. Perform VTM general setup, run confidence test and enter vehicle If)

3. If there IS more than one battery in the vehicle/equipment, then find the battery series pair that includes the battery under test A battery series pair is

a pair of batteries for which the negative terminal of one battery is connected by a cable to the positive terminal of another battery. For example, In

figure 1 and 2 below, batteries A a nd B area series pair, and in figure 1 below, batteries C and D are a series pair,

4a. If the vehicle/equipment under test has more than one battery or If the VTM IS powered from an alternate power source, then use tests 77 and

79 Connect the red clip of test probe cable W2 to the positive terminal of the battery under test. Connect the black clip of test probe cable W2

10 the negative terminal of the battery under test

b. If the vehicle/equipment under test has only one battery which IS also supplying power to the VTM. use tests 73 and 75. The test probe cable

W2 IS not used.

5a. If the vehicle/equipment under test has more than one batter, then the battery under test IS part of a series pair of batteries. Clamp the

current probe around the cable connecting the series pair. point the arrow on the current probe along the cable Ieadlng towards the

negative terminal as shown in figures 1 and 2

b. If the vehicle/equipment under test has only one battery, then clamp the current probe around the positive battery cable connected to the

starter Point the arrow on the current probe along the cable in the direction Ieading towards the starter as shown in figure 3.

TEST PROCEDURE

1

2

3

4

Condition the current probe before running these tests

Measure the battery resistance change by entering test number 75 or 79 (as described In the hookup procedure) Then engage the starter for about

5 seconds

Measure the battery Internal resistance by entering test number 73 or 77 (as described in the hookup procedure) Then engage the starter

for about 5 seconds,

Compare the results of both measurements to Iimits In the vehicle/equipment TM or to limits on the reverse side of this card

If either measurement iS outside of normal limits, check battery terminals and connections, and check battery electrolyte level Then perform both

measurements a second time.

If the battery resistance change lest (75 or 79) falls after the second measurement, then the battery IS in bad condition The battery may be able to

accept and hold a charge, but it wiII quickly become discharged during use. A battery in bad condition should be replaced

If the battery internal resistance test (73 or 77) fails after the second measurement, then the battery should be recharged.

3-254 Change 1
TM 9-2350-261-20-1

STE/ICE BATTERY SERIES PAIR TEST CARD

Change 1 3-254.1
TM 9-2350-261-20-1

STE/ICE BATTERY SERIES PAIR TEST CARD

3-254.2 Change 1
TM 9-2350-261-20-1

STE/ICE BATTERY PACK TEST CARD

The BATTERY INTERNAL RESISTANCE TEST (73 or 77) evaluates the state of charge of an individual battery. The BATTERY RESISTANCE

CHANGE TEST (75 or 79) evaluates whether the battery is good or bad, even if it is discharged. A good battery that is discharged bay be discharged. A

bad battery may hold a charge for a short time.

STE/ICE HOOKUP

1. The power to operate the STE/ICE VTM may be taken from the batteries being tested as shown in the appropriate figure below or from an alternate

power source (such as another vehicle's batteries).

2. Perform VTM general setup; run confidence test, and enter vehicle ID.

3. a. If power to the VTM comes from a different set of batteries than the battery pack under test, use tests 77 and 79. Connect test probe cable W2 to the

battery pack under test. Connect the red clip to the positive terminal closest to the starter. Connect the black clip to the negative terminal closest

to vehicle/equipment ground.

b. If power to the VTM comes from the battery pack under tests, use tests 73 and 75 The test probe cable W2 is not used.

4. Clamp the current probe around the positive cable connected to the starter. Point the arrow on the current probe along the cable leading towards the

starter as shown in figure 1.

TEST PROCEDURE

1. Condition the current probe before running these tests.

2. Measure the battery resistance change by entering test number 75 or 79 (as described in the hookup procedure). Then engage the starter for about

5 seconds.

3. Measure the battery resistance by entering test number 73 or 77 (as described in the hookup procedure). Then engage the starter for about

5 seconds.

4. Compare the results of both measurements to limits in the vehicle/equipment TM or to limits on the reverse side of this card.

5. If either measurement is outside of normal limits, check battery terminal and connections, and check battery electrolyte level. Then perform both 

measurements a second time.

6. If the battery resistance change test (75 or 79) tails after the second measurement, then the battery pack is in bad condition. Test each series pair to

determine which is good and which is bad.

7. If the battery internal resistance test (73 a 77) fails after the second measurement, then the battery should be recharged.

Change 1 3-254.3
TM 9-2350-261-20-1

STE/ICE BATTERY PACK TEST CARD

3-254.4 Change 4
TM 9-2350-261-20-1

STE/lCE BATTERY PACK TEST CARD

Change 1 3-255
TM 9-2350-261-20-1

STE/ICE-R CHARGING CIRCUIT TROUBLESHOOTING

INITIAL SETUP

Tools:

General Mechanic’s Tool Kit (Item 30,

STE/ICE-R Test Set (Item 71.1, App

Personnel Required

Unit Mechanic

References:

see your-10

References (cont):

App D) TM 9-4910-571-12&P

D) Charging system malfunctions (page 3-55)

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant access door open (see your -10)

STE/ICE-R power hooked up (page 3-275)

CONDITION CURRENT PROB E

1.

2.

3.

4.

5.

6.

7.

8.

Clamp current probe around battery positive cable.

Point arrow on current probe toward starter and clamp

probe on battery positive cable to starter.

Ensure current probe is closed.

Crank engine for several cycles with fuel off.

Turn off all electrical power.

Set test select switches to 90.

Press and hold test until CAL appears on display.

Is offset value within limits of- 225 to + 225?

I

YES

1. Remove current probe from battery cable.

2. Start engine (see your-10).

3. Install current probe around circuit 2 lead of generator.

4. Point arrow on current probe toward battery.

1. Go to offset fault isolation

(TM 9-4910-571-12&P). 

2. Repeat this troubleshooting. I

Change 1 3-256 
TM 9-2350-261-20-1

 OUTPUT CURRENT 

1. Set test select switches to 01.

2. Press and release test button.

3. When PASS appears, set test select switches to 03.

4. Press and release test button.

5. When PASS appears, set test select switches to 90.

6. Press and release test button.

7. Turn on lights and accessories.

8. Set engine speed to 1000 to 1200 rpm.

9. Is output current below 70 amps?

YES

1. Stop engine (see your-10).

2. Turnoff lights and accessories.

3. Adjust generator drive belts (page 9-44).

4. Are drive belts ok?

YES

1. Check operation of generator field switch (page 9-44).

2. Was generator field switch repaired?

I 1. Verify no faults found.

1. Go to battery/generator

indicator malfunctions

(page 3-143).

2. Verify no faults found.

1. Replace generator drive belts

(page 9-29).

2. Verify no faults found.

1.

2.

Check charging system

cables for loose or corroded

connections.

Verify no faults found.

Change 1 3-257
TM 9-2350-261-20-1

FIELD CURRENT 

1.

2.

3.

4.

5.

6.

7.

8.

9.

Install current probe around circuit 1 lead of generator

to regulator cable.

Point arrow on current probe toward generator.

Set test select switches to 01.

Press and release test button.

When PASS appears, set test select switches to 90.

Press and release test button.

Raise engine speed to 1000 to 1200 rpm and read rpm

display.

Stop engine (see your-10).

Is current below 6 amps?

YES

1. Check continuity of cables from regulator to generator.

2. If cables are ok, go to charging system malfunctions

(page 3-55).

3. Verify no faults found.

NO 1. Go to charging system malfunctions page 3-55).

I 2. Verify no fault found.

3-258 Change 1
TM 9-2350-261-20-1

STE/ICE-R STARTER CIRCUIT TROUBLESHOOTIN G

INITIAL SETUP

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your –10

TM 9-4910-571-12&P

TM 9-6140-200-14

References (cont):

Engine cranks slowly (page 3-25)

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant access door open (see your -10)

All electrical power off (see your -10)

STE/ICE-R hooked up for tests 72 thru 75

(page 3-281)

STE/ICE-R hooked up for power (page 3-275)

1. Make sure all electrical accessories are off.

2. Set test select switches to 74.

3. Press and hold test button until CAL appears on

display.

4. Release test button, wait for offset value to appear on

display.

5. Is offset value within-225 to +225?

YES

1. Install current probe on positive battery cable.

2. Shut off fuel.

3. Press and release test button.

NOTE

While cranking engine with bad or

discharged batteries, it is possible for

VTM to lose power and come on again

after cranking has stopped. If this

occurs, clean battery posts and clamps.

If they are loose or corroded, correct

them and repeat test.

4. When GO appears, crank engine until OFF or ERROR

message is displayed (normally 5 seconds).

5. Is a number displayed?

1

GO TO NEXT PAGE

1. Go to offset fault isolation

(TM9-4910-571-12&P). I

I 2. Verify no faults found. I

Change 1 3-259
TM 9-2350-261-20-1

1. Is starter circuit resistance within 5 to 27?

YES

1. Check batteries to make sure they are fully charged

(TM 9-6140-200-14). 

2. Verify no faults found.

1. Is E013 displayed? NO

YES

1. Check batteries to make sure

they are fully charged

(TM 9-6140-200-14). 

2. Verify no faults found.

I

1. Crank engine (see your-10).

2. Does any message appear other than GO?

1. Is this the third time E013 was displayed? NO

YES

1. Repeat this part of troubleshooting.

4

k

1. Turnoff all electrical equipment. NO 1. Go to offset fault isolation

2. Set test select switches to 90. (TM9-4910-571-12-&P).

3. Press and hold test until CAL appears on display. 2. Verify no faults found.

4. Is offset value within limits of -225 to +225?

I

YES

1. Press and release test button. NO 1. Check batteries

2. Crank engine for a few seconds with fuel off.

3. Is starter current above 100 amps?

(TM 9-6140-200-14).

2. Verify no faults found.

\

3-260 Change 1
TM 9-2350-261-20-1

1. Error message E013 displayed earlier indicates short

circuit, frozen starter, or tight engine.

2. Check wiring to starter for short circuits.

3. If wiring is ok, engine maybe tight.

4. Notify direct support maintenance.

5. Verify no faults found.

1. Is resistance high? NO 1. Repair short circuit in

starter circuit.

YES 2. Verify no faults found.

1. Attempt to start engine while listening for clicking of NO 1. Check switches, wiring,

starter solenoid. relays, and circuit breakers

2. Does starter solenoid click? to starter solenoid.

1. Connect test probe cable W2P1 to J4 on VTM.

2. Connect red and black clips together.

3. Set test select switches to 89.

4. Press and hold test until CAL appears on display.

5. Is offset value within limits of -6.8 to +6.8?

YES

1. Connect black clip of test probe cable W2 to the negative

battery terminal.

2. Connect red clip of test probe cable W2 to the positive

terminal of starter.

3. Press and release test button.

4. Crank engine and read displayed voltage.

5. Is starter voltage above 17 volts?

GO TO NEXT PAGE

I 2. Verify no faults found.

NO 1. Go to offset fault isolation

(TM 94910-571-12&P).

I 2. Verify no faults found.

NEXT PAGE

Change 1 3-261
TM 9-2350-261-20-1

1. Move red clip of test probe cable W2 to ground terminal 1. Clean, inspect, and repair

of starter. cables as needed.

2. Crank engine and read displayed voltage. 2. Verify no faults found.

3. Is voltage drop less than 18 volts?

I

1. Replace starter (page 10-2).

2. Verify no faults found. I

v

1. Move red clip of test probe cable W2 to positive terminal

of starter solenoid.

2. Crank engine and read displayed voltage.

3. Is solenoid voltage above 18 volts?

YES

1. If GO message occurred during starter circuit resistance test, check switches and wiring to solenoid.

NOTE

Voltage drop across a connection should

be less than 0.1 volt and a voltage drop

across a cable should be less than 0.2

volts. Check voltage drop across solenoid

and all cables/connections in positive

side if starter circuit.

2. Set test select switches to 89.

3. Connect clip leads of test probe W2 across part to be

measured.

4. Press and release test button.

5. Engage starter.

6. Repair part if voltage drop is high.

7. If ’switches and wiring to solenoid are ok, replace solenoid and starter (page 10-2).

8. Verify no faults found.

3-262 Change 1
1. Set test select switches to 67.

2. Press and release test button.

3. Crank engine and read displayed voltage?

4. Was battery voltage above 19 volts while cranking?

1. Check switches and wiring to starter solenoid.

2. Repair if necessary.

3. Verify no faults found.

TM 9-2350-261-20-1

1. Checkbatteries

(TM 9-6140-200-14).

2. Verify no faults found.

Change 1 3-263
TM 9-2350-261-20-1

STE/ICE-R LOW OIL PRESSURE TROUBLESHOOTING

INITIAL SETUP

Tools: Equipment Conditions:

General Mechanic’s Tool Kit (Item 30, App D)

STE/ICE-R Test Set (Item 71.1, App D)

Engine stopped (see your -10)

Carrier blocked (see your -10)

Personnel Required:

Unit Mechanic

References:

Trim vane lowered (see your -10)

Power plant access door open (see your -10)

STE/ICE-R hooked up for power (page 2-275)

STE/ICE-R engine RPM test hooked up

(page 3-277)

See your -10

Engine oil low pressure indicator fails to go

off after engine starts (page 3-50)

1.

2.

Remove oil pressure sending unit (1) from engine.

Install blue striped pressure transducer (2) in place of

sending unit (1).

3. Connect transducer cable W4P1 (3) to J3 (4) on VTM.

4. Connect transducer cable W4P2 (5) to pressure

transducer (2).

5. Set test select switches to 50.

6. Press and hold test button until CAL appears on

display.

7. Is offset value within -150 to +150?

3-264 Change 4

1. Go to offset fault isolation

(TM 9-4910-541-12&P).

2. Verify no faults found.
TM 9-2350-261-20-1

1. Set test select switches to 01.

2. Press and release test button.

3. When CON appears, set test select switches to 50.

4. Press and release test button.

5. Start engine (see your-10).

6. Raise engine speed to 2500 rpm.

7. Is oil pressure within 40 to 60 psi?

Y E S

1. Check sending unit and engine wiring harness.

2. Verify no faults found.

1. Stop engine immediately

(see your 10-1).

2. Replace engine oil filter

element (page 4-3).

3. Verify no faults found.

4. If oil pressure is not within

40 to 60 psi, notify direct

support maintenance.

Change 1 3-265
TM 9-2350-261-20-1

STE/ICE-R BATTERY TROUBLESHOOTIN G

INITIAL SETUP

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

TM 9-4910-571-12&P

TM 9-6140-200-14

References (cont):

Battery/generator indicator malfunctions

(page 3-143)

Equipment Conditions:

Engine stopped (see your –10)

Carrier blocked (see your -10)

Fuel off, engine must not start (see your -10)

All electrical power off (see your -10)

STE/ICE-R Starter circuit test hooked up

(page 3-279)

STE/ICE-R Power hooked up (page 3-275)

1. Make sure all electrical accessories are off. NO 1. Go to offset fault isolation

2. Set test select switches to 75.

3. Press and hold test button until CAL appears on

(TM 9-4910-571-12&P).

2. Verify no faults found.

display.

4. Release test button, wait for offset value to appear on

display.

5. Is offset value within -225 to +225?

1. Press and release test button.

NOTE

While cranking engine with bad or

discharged batteries, it is possible for

VTM to lose power and come on again

after cranking has stopped, if this

occurs, clean battery posts and clamps.

If they are loose or corroded, correct

them and repeat test.

2. When GO appears, engage starter switch for two seconds or until OFF is displayed.

3. Is test value displayed?

3-266 Change 1

1. If display shows GO, there is

a bad connection in the starter circuit. Check cables and

connections to starter and

repeat test.

2. If GO is still displayed, then

you may have a very poor

battery in the series pair being tested.

3. If display shows .9.9.9.9.,

there may be a bad connection on the batteries being

tested. Clean and tighten the

connections on the batteries

and repeat test.

4. If display shows – -- -or

.9.9.9.9., the batteries being

tested maybe in a discharged state. Check batteries electrolyte level; charge

batteries and repeat test.

5. If display shows E013 three

times, or----, or .9.9.9.9.

after batteries have been

charged, replace batteries.

6. Verify no faults found.
TM 9-2350-261-20-1

1. Do batteries resistance change less than 50

milliohms/seconds?

1. Set test select switches to 73.

2. Press and release test button.

3. After GO appears, engage starter until OFF appears.

4. Is battery internal resistance less than 25 milliohms?

1. Batteries are OK.

2. If display shows GO, there is a bad connection in the

starter circuit. Check cables and connections to starter

andrepeat test.

3. If GO is still displayed, then you may have a very poor

battery in the series pair being tested. Test each battery individually.

4. If display shows .9.9.9.9., there maybe a bad connection on the battery being tested. Clean and tighten the

connections on the batteries and repeat test.

5. If display shows E013 or .9.9.9.9., the batteries being

tested maybe in a discharged state. Checkbatteries

electrolyte level; charge batteries and repeat test.

6. If display shows E013 three consecutive times, or

- - - -, or .9.9.9.9. after batteries have been charged,

replace battery.

7. Verify no faults found.

GO TO NEXT PAGE

NOTE

If batteries fail in freezing

weather, crank engine for

five seconds and retest.

This will war m the

batteries slightly.

1. Check batteries electrolyte

2. Clean battery terminals.

3. Check batteries specific

gravity.

4. Charge batteries, if neces5. Repeat test on this battery.

6. If batteries have been

charged and batteries resistance change still exceeds

limits, replace battery.

7. Verify no faults found.

Change 1 3-267
TM 9-2350-261-20-1

1. Clamp current probe between batteries and starter.

2. Point arrow on probe toward starter.

3. Set test select switches to 72.

4. Press and release test button.

5. When GO appears, shut off fuel and engagestarter

switch for two seconds or until OFF is displayed.

6. Is a number displayed?

1. Is the first peak current reading within 700 to

1275 amps?

1. Check electrolyte levels in batteries

(see TM 9-6140-200-14).

2. Clean battery terminals.

3. Check specific gravity in batteries

(see TM 9-6140-200-14).

4. Chargebatteries if necessary.

5. Verify no faults found.

72 700-1275 Amps

73 ≤ 25 milli ohms

75 ≤ 50 milli ohms

3-268 Change 4
TM 9-2350-261-20-1

I 1. Is E013 displayed? 1. Check electrolyte levels in

batteries

(See TM 9-6140-200-14).

2. Clean battery terminals.

3. Check specific gravities in

batteries

(See TM 9-6140-200-14).

4. Charge batteries if necessary.

5. Verify no faults found.

1. Is this the third time E013 was displayed? NO 1. Verify no faults found.

1. Check electrolyte levels in batteries

(seeTM 9-6140-200-14.

2. Clean battery terminals.

3. Check specific gravities in batteries

(see TM 9-6140-200-14).

4. Charge batteries if necessary.

5. Verify no faults found.

1. Is first peak current below 700 amps? NO 1. Engine is tight. Notify direct

support maintenance.

YES

1. Check electrolyte levels in batteries

(SeeTM 9-6140-200-14).

2. Clean battery terminals.

3. Check specific gravities in batteries

(see TM 9-6140-200-14).

4. Charge batteries if necessary.

5. Verify no faults found.

Change 1 3-269
STE/ICE-R ENGINE WILL NOT CRANK TROUBLESHOOTIN G

INITIAL SETUP

Tools:

General Mechanic’s

Personnel Required:

Unit Mechanic

References:

See your -10

References (cont):

Tool Kit (Item 30, App D) Engine does not crank (page 3-15)

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

Power plant access door open (see your -10)

Trim vane lowered (see your -10)

1. Engage starter switch and listen to starter.

2. Does starter sound like it is running over speed?

YES

1. Remove starter (page 10-2).

2. Check for missing or damaged teeth on flywheel.

3. Are all teeth good?

1. Check bendix spring, starter, or solenoid.

2. Replace parts as needed.

3. Verify no faults found.

3-270 Change 1

NO 1. Go to starter circuit troubleshooting (page 3-259).

I 2. Verify no faults found.

NO 1. Notify direct support

maintenance.

TM 9-2350-261-20-1
TM 9-2350-261-20-1

STE/ICE-R ENGINE WILL CRANK BUT WILL NOT START

TROUBLESHOOTING

INITIAL SETUP

Tools:

General Mechanic’s Tool Kit (Item 30, App D)

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Engine cranks but will not start below 40°

(air box heater is used) (page 3-34)

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant access door open (see your -10)

STE/ICE-R power hooked up (page 3-275)

STE/ICE-R engine RPM test hooked

up (page 3-277)

1. Verify that there is fuel in gas tank.

2. Bleed air out of fuel system as necessary.

3. Drain water from primary fuel filter.

4. Check for kinked, flattened, or broken fuel lines.

5. Check quick disconnect fittings for blockage in fittings.

6. Check fuel shutoff cable (page 23-44).

7. Check engine fuel pump (page 6-121).

CAUTION

Operation of engine with red stripe

transducer installed could damage

transducer. Remove re d stripe

transducer before starting engine.

1. Shut off fuel (see your -10).

2. Set test select switches to 10.

3. Press and release test button.

4. Crank engine and read display.

5. Is crank speed 100 rpm or more.

1. Go to STE/ICE-R starter

circuit troubleshooting

(page 3-293).

2. Verify no faults found.

GO TO NEXT PAGE

Change 4 3-271
TM 9-2350-261-20-1

8. Disconnect fuel supply hose (1) from secondary fuel

filter (2).

9. Connect red stripe pressure transducer (3) to secondary fuel filter outlet.

10. Connect transducer cable W4P1 (4) to J3 on

VTM (5).

11. Connect transducer cable W4P2 (6) to red stripe

pressure transducer (3).

12. Set test select switches to 49.

13. Press and hold test until CAL appears on display.

14. Is offset value within range of -4 to + 4?

1. Turn on fuel and accessory switches.

2. Press and release test button.

3. Crank engine and read display.

4. Is fuel pressure greater than 4 psi?

1. Go to offset fault isolation

(TM 9-4910-571-12&P).

2. Verify no faults found.

3-272 Change 1
TM 9-2350-261-20-1

1. Remove red stripe pressure transducer from secondary

fuel filter.

2. Check operation of engine shutoff cable (page 23-44).

3. Check restriction in air intake (page 23-44).

4. Check cold weather operation (see your -10).

5. If engine still does not start, notify direct support

maintenance.

6. Verify no faults found.

1. Remove red stripe pressure transducer from secondary

fuel filter. -

2. Connect fuel supply hose to secondary fuel filter.

3. Remove inlet plug (1) from secondary fuel filter (2), and

install red stripe pressure transducer (3) in inlet hole

(4) of filter

CAUTION

Pull fuel shutoff all the way out. Transducer will be damaged if engine starts.

4. Pull fuel shutoff all the way out.

5. Crank engine and read display.

6. Is fuel pressure greater than 4 psi?

NO 1.

2.

3.

4.

5.

6.

7.

Remove red stripe pressure

transducer from secondary

fuel filter.

Check engine fuel pump

(page 6-121).

Check generator field switch

(page 9-44).

In freezing temperatures,

check fuel lines for ice blockage or coagulation of fuel.

Start engine (see your -10).

If engine still does not start,

repair blockage in fuel line.

Verify no faults found.

GO TO NEXT PAGE

Change 1 3-273
TM 9-2350-261-20-1

1. Remove red striped pressure transducer and install

plug in secondary fuel filter.

2. Replace fuel filter element (page 6-128).

3. Start engine (see your-10).

4. If engine still does not start, check fuel system.

5. Verify no faults found.

3-274 Change 1
TM 9-2350-261-20-1

HOOK UP/REMOVE STE/ICE-R FOR POWE R

INITIAL SETUP

Tools: References:

STE/ICE-R Test Set (Item 71.1, App D) See your -10

TM 9-4910-571-12&P

Personnel Required:

Unit Mechanic Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

HOOK UP

1.

2.

3.

Remove VTM and power cable W5 from

transit case.

Pull VTM circuit breaker to OFF.

Install plug W5P1 (1) on VTM jack J1 (2).

4. Remove battery cover. See CHECK CARRIER

BATTERIESS in your -10.

5. Connect red clip of power cable W5 to positive

terminal of battery.

6. Connect black clip of power cable W5 to

negative terminal of battery.

GO TO NEXT PAGE

Change 1 3-275
TM 9-2350-261-20-1

7. Push

a. If

to

b. If

VTM circuit breaker to ON.

display reads (8888) and (- -- -), go

step 8.

display is not blank, but does not read

(8888) and (- - - -), write up DA form

2404 on faulty VTM display. Report

problem to supervisor.

c. If display is blank, go to VTM blank

display diagnostic troubleshooting

(see TM 9-4910-571-12&P).

8. Perform VTM confidence check

(see TM 9-4910-571-12&P). If VTM

confidence check does not pass, go to

STE/ICE confidence test fault isolation

(see TM 9-4910-571-12&P).

9. Select test 60, then press and release TEST

button.

10.

11.

12.

Enter earner VID (03) into VTM, then

press and release TEST button.

Select test 61, then press and release TEST

button. If earner VID (03) does not appear

on VTM display,

(see-TM 9-4910-571-12&P). 

Return to troubleshooting.

13.

14.

15.

16.

Pull VTM circuit breaker to OFF.

Remove power cable W5 from batteries and

VTM. Use electrical connector pliers.

Install battery cover. See CHECK CARRIER

BATTERIES in your -10.

Stow VTM and power cable W5 in transit

case.

END OF TASK

3-276 Change 1

REMOV E
TM 9-2350-261-20-1

HOOK UP/REMOVE STE/ICE-R FOR ENGINE RP M

INITIAL SETUP

Tools: References (cont):

General Mechanic’s Tool Kit (Item 30, App D) TM 9-4910-571-12&P

STE/ICE-R Test Set (Item 71.1, App D)

Equipment Conditions:

Personnel Required: Engine stopped (see your

Unit Mechanic Carrier blocked (see your

STE/ICE-R power hooked up (page 3-275)

References: Power plant rear access panel removed

See your -10 (page 24-27 or 24-29)

-10)

-10)

HOOK UP 4.

1.

2.

3.

Remove transducer cable W4 and pulse

tachometer from transit case.

5.

Pull VTM circuit breaker to OFF.

Connect cable W4P1 (1) to jack J2 TK (2)

on VTM.

6.

7.

8.

Disconnect tachometer cable (3) from

tachometer drive adapter (4) on engine

(page 11-14).

Install pulse tachometer (5) on tachometer

drive adapter (4).

CAUTIO N

To prevent cable damage, make sure

cable is clear of belts and fan blade.

Connect cable W4P2 (6) to pulse

tachometer (5).

Push VTM circuit breaker to ON.

Return to troubleshooting.

GO TO NEXT PAGE

Change 1 3-277
TM 9-2350-261-20-1

REMOVE

9. Pull VTM circuit breaker to OFF.

10. Disconnect cable W4P2 from pulse

tachometer.

11. Remove pulse tachometer from tachometer

drive adapter.

12. Install tachometer cable on drive adapter

(page 11-14).

13. Remove cable W4P1 from jack J2 TK on

VTM.

14. Stow transducer cable and pulse tachometer

in transit case.

3-278 Change 1

END OF TASK
TM 9-2350-261-20-1

HOOK UP/REMOVE STE/ICE-R FOR STARTER CIRCUIT TESTS

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

References (cont):

TM 9-4910-571-12&P

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

STE/ICE-R power hooked up (page 3-275)

HOOK UP NOTE

1.

2.

3.

4.

Remove transducer cable W4 from transit

case.

Pull VTM circuit breaker to OFF.

If current probe is below room temperature, wait at least 5 minutes after connecting probe to VTM before doing offset

test, or perform offset within 30 seconds

of starting each measurement.

Install cable W4P1 (1) on VTM jack

J3 TK (2).

5.

Attach cable W4P2 (3) to current probe (4).

Clamp current probe (4) around positive (+)

battery cable (5) going to the starter (6).

Point arrow on probe along cable to starter.

Make sure probe is closed.

GO TO NEXT PAGE

Change 4 3-279
TM 9-2350-261-20-1

6. Push VTM circuit breaker to ON.

a. If display reads (8888) and (- - - -), go

to step 7.

b. If display is not blank, but does not read

(8888) and (- - - -), write up DA form

2404 on faulty VTM display. Report problem to supervisor.

c. If display is blank, go to VTM blank

display diagnostic troubleshooting

(See TM 9-4910-571-12&P).

Steps 7 thru 10 deleted.

11. Return to troubleshooting.

REMOVE

12. Pull VTM circuit breaker to OFF.

13. Remove transducer cable W4 from battery

cable and VTM.

14. Disconnect cable W4P2 from current probe.

15. Stow transducer cable W4 and current probe

in transit case.

END OF TASK

3-280 Change 4
TM 9-2350-261-20-1

HOOK UP/REMOVE STE/ICE-R TEST SET FOR TEST NUMBERS

72 THRU 75

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

All electrical accessories turned off

(see your -10)

Engine at operating temperature

(see your -10)

Fuel off, engine must not start (see your -10)

STE/ICE-R power hooked up (page 3-275)

HOOK UP 6.

1.

2.

3.

4.

5.

NOTE

Do not have battery charger connected

when performing test numbers 72 thru 75.

Remove transducer cable W4 and current

probe from transit case.

Pull VTM circuit breaker to OFF.

Install cable W4P1 (1) on VTM

jack J3 TK (2).

Attach cable W4P2 (3) to current probe (4).

Push VTM circuit breaker to ON.

7.

Remove battery cover. See CHECK CARRIER

BATTERIES in your -10.

For test numbers 72 or 74, current probe (4)

is connected to positive cable (5) between

battery (6) and starter (7). Point arrow on

current probe along cable to starter. Make

sure current probe is closed.

GO TO NEXT PAGE

Change 1 3-281
TM 9-2350-261-20-1

8. For test numbers 73 or 75, clamp current

probe (1) around cable (2) connecting series

pair of batteries (3). Point arrow on current

probe along cable toward negative (-)

terminal (4). Make sure current probe is

closed.

NOTE

Engine must not start while cranking

engine. If engine starts, repeat step 8.

9. Continue current probe by engaging starter

only long enough to briefly turn engine

(approximately 1 second).

10. Return to troubleshooting.

REMOV E

11. Pull VTM circuit breaker to OFF.

12. Remove cable W4P1 from VTM jack J3 TK.

13. Remove cable W4P2 from current probe.

14. Install battery cover. See CHECK CARRIER

BATTERIES in your -10.

15. Stow transducer cable W4 and current probe

in transit case.

END OF TASK

3-282 Change 4
TM 9-2350-261-20-1

STE/ICE-R TEST 01 DISPLAY ENGINE RPM WITH NEXT

MEASUREMENT

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

STE/ICE-R power hooked up (page 3-275)

STE/ICE-R engine RPM test hooked up

(page 3-277)

1. Select TEST 01.

2. Press and release TEST button.

3. VTM will display CON.

NOTE

Hook up and offset steps should already

have been completed. Do not repeat.

Go to desired measurement procedure.

Follow that procedure. VTM will alternately display the engine speed and the

desired measurement. The first number

displayed will be RPM.

4. Return to troubleshooting.

END OF TASK

Change 1 3-283
TM 9-2350-261-20-1

STE/ICE-R TEST 10 ENGINE RPM

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

TM 9-4910-571-12&P

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

STE/ICE-R power hooked up (page 3-275)

STE/ICE-R starter circuit test hooked up

(page 3-279)

STE/ICE-R engine RPM test hooked up

(page 3-277)

1. Select TEST 10.

2. Press and release TEST button.

3. VTM will display engine RPM:

CONDITION ENGINE RPM

CRANKING 100 minimum

IDLE 650-700

GOVERNED 2975-3000

SPEED (NO

LOAD)

a. If error message appears, see page 3-242.

NOTE

At speeds below 50 RPM, the VTM will

display 0. At speeds above 5000 RPM, the

display may give a false reading.

b. If display is erratic or reads 0 with engine

turning, see TM 9-4910-571-12&P.

4. Read cranking RPM while starting engine.

5. Check engine idle speed.

a. Watch VTM for 10 seconds.

b. If engine idle speed does not remain

between 650 and 700 RPM, notify direct

support maintenance.

6. Return to troubleshooting.

END OF TASK

3-284 Change 4
TM 9-2350-261-20-1

STE/ICE-R TEST 13 POWER (PERCENT)

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

If VID has been performed during power

hookup procedures (page 3-275) go to

step 2. If not, continue with step 1.

NOTE CAUTION

Engine governor speed must be checked

before performing power test. If governor

speed is not within limits specified for

vehicle/equipment, notify direct support

maintenance.

1. Enter VID.

a. Set TEST SELECT switches to 60.

b. Press and release TEST button.

c. Wait for prompting message UEH to appear on display.

Do not run power test if governor speed is

not within specified limits. Damage to

engine may result.

d. Observe displayed value (rpm).

d. Set TEST SELECT switches to 03.

e. Press and release TEST button.

f. Wait for VTM to display and hold VID

number.

3. Perform power test.

2. Start and idle engine.

a. Set TEST SELECT switches to 10.

b. Press and release TEST button.

a. Set TEST SELECT switches to 13.

b. Press and release TEST button.

c. Wait for prompting message UEH to appear on display. If UEH does not appear

on display, go to substep g.

d. Set TEST SELECT switches to 03.

e. Press and release TEST button.

NOTE NOTE

Engine idle speed must be checked before

performing power test. If idle speed is not

within limits specified for

vehicle/equipment, adjust idle speed to

be within proper limits.

The number just entered will remain on

the display only a few seconds.

f. Wait for VTM to display the VTD just

entered.

Do not run power test if idle speed cannot

be properly adjusted.

c. Observe displayed value (rpm) and adjust

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

STE/ICE-R power hooked up (page 3-275)

STE/ICE-R engine RPM test hooked up

(page 3-277)

Warm engine to operating temperature

(see your -10)

idle speed if necessary.

GO TO NEXT PAGE

Change 4 3-285
TM 9-2350-261-20-1

NOTE CAUTION

If a prompting message Po-1 appears on

the display, refer to substeps 2c for Po-1

and 2d for Po-2.

To prevent damage to equipment, allow

engine to idle for at least two minutes

after running power test.

If prompting message Po-1 does not appear on the display, go to substep m.

o. A number will be displayed after engine

has returned to idle speed. This number is

the test result in units of percent of

g nominal rated power. .

h.

j.

k.

l .

Wait for prompting message Po-1 to

appear on display.

Set TEST SELECT switches to Po-1

value.

Press and release TEST button.

Wait for prompting message Po-2 to

appear on display.

Set TEST SELECT switches to Po-2

value.

m. Press and release TEST button.

n. When CIP is displayed, sharply depress

accelerator. Hold it to the floor. When

VTM displays OFF, release accelerator.

4. Return to troubleshooting.

% Power Minimum Test Limit

Altitude

Vehicle 2000 ft to Above

0-2000 ft 4000 ft 4000 ft

M113 FOV 75% 66% 60%

END OF TASK

3-286 Change 4
TM 9-2350-261-20-1

STE/ICE-R TEST 14 COMPRESSION UNBALANCE

(POWER CABLE)

INITIAL SETUP

Tools: Equipment Conditions (cont):

STE/ICE-R Test Set (Item 71.1, App D) Carrier blocked (see your -10)

Personnel Required:

STE/ICE-R power hooked up (page 3-275)

Warm engine to operating temperature

Unit Mechanic (see your -10)

Disengage transfer gearcase (see your -10)

References: Run test 72 (page 3-290)

See your -10 Run test 73 (page 3-291)

Run test 74 (page 3-293)

Equipment Conditions: Run test 75 (page 3-291)

Engine stopped (see your -10)

NOTE

If VID has been performed during power

hookup procedure (page 3-275) go to step

2. If not, continue with step 1.

1. Enter VID.

c.

d.

e.

a.

b.

c.

d.

e.

f.

Wait for prompting message UEH to appear on display. If UEH does not appear

on display, go to substep g.

Set TEST SELECT switches to 03.

Press and release TEST button.

NOTE

The number just entered will remain on

the display only a few seconds.

Set TEST SELECT switches to 60.

Press and release TEST button.

Wait for prompting message UEH to appear on display.

f.

Set TEST SELECT switches to 03 for

vehicle being tested.

g.

Press and release TEST button.

Wait for VTM to display and hold VID

number.

NOTE

h.

i.

j.

Do not run more than two compression

unbalance tests in a row. Idle engine

between pairs of compression unbalance

tests.

k.

Crank engine without fuel for 5 seconds

to clear fuel from cylinders.

2. Perform test.

a. Set TEST SELECT switches to 14.

b. Press and release TEST button.

Wait for VTM to display the VID just

entered.

Wait for prompting message CYL to

appear on display. If cylinder does not

appear, go to substep y.

Set TEST SELECT switches to 06.

Press and release TEST button.

Wait for VTM to display the Cu-1

prompting message.

Set TEST SELECT switches to the value

of the Cu-1 constant.

GO TO NEXT PAGE

Change 4 3-287
TM 9-2350-261-20-1

l. Press and release TEST button.

m. Wait for VTM to display the Cu-2

x. press and release TEST button.

y. When GO appears, crank engine. Display

n.

o.

p.

q.

r.

s.

t.

u.

v.

w.

prompting message.

Set TEST SELECT switches to the value

of the Cu-2 constant.

will change to (- - - -) while engine is

turning.

NOTE

press and release TEST button.

Wait for VTM to display the Cu-3

prompting message.

Set TEST SELECT switches to the value

of the Cu-3 constant.

press and release TEST button.

Wait for VTM to display the Cu-4

prompting message.

Set TEST SELECT switches to the value

of the Cu-4 constant.

press and release TEST button.

Wait for VTM to display the Cu-5

prompting message.

Set TEST SELECT switches to the value

of the Cu-5 constant.

If E013 appears, test data cannot be analyzed because of weak batteries or interrupted cranking during test. Correct

problem and repeat step 2.

z. When OFF or E013 appears, stop cranking. Wait for message to appear.

(1) If a number is displayed, refer to the

vehicle test card for its meaning.

(2) If GO appears, go back to substep y.

(3) A FAIL message usually means compression is too far unbalanced to measure with STE/ICE-R. Occasionally, a

FAIL message may be caused by

vehicle/equipment accessories that are

activated during cranking or by

imperfections in the starting system.

END OF TASK

3-288 Change 1
TM 9-2350-261-20-1

STE/ICE-R TEST 67 BATTERY VOLTAGE

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

TM 9-4910-571-12&P

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

STE/ICE-R power hooked up (page 3-275)

STE/ICE-R starter circuit test hooked up

(page 3-279)

STE/ICE-R engine rpm test hooked up

(page 3-277)

1. Select TEST 67. b. If error message appears, see page 3-242.

2. Press and release TEST button.

CONDITION VOLTS

c. If .9.9.9.9 is displayed, voltage is not

within test range. Use test 89, see

TM 9-4910-571-12&P.

ENGINE OFF 22 or more 3. Return to troubleshooting.

MASTER SWITCH

OFF

CRANKING 18 or more

ENGINE FUEL

OFF

CHARGING 1200 26 to 29

RPM SERVICE

LIGHTS ON

a. If display is erratic or shows 0 volts, see

TM 9-4910-571-12&P.

END OF TASK

Change 4 3-289
TM 9-2350-261-20-1

STE/ICE-R TEST 72 STARTER CURRENT (FIRST PEAK)

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

TM 9-4910-571-12&P

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

All electrical accessories turned off

(see your -10)

Fuel OFF, engine must not start

(see your -10)

STE/ICE-R power hooked up (page 3-275)

STE/ICE-R starter circuit test hooked up

(page 3-279)

1. Select TEST 72. DISPLAY PERFORM/RESULT

2. Perform offset test. a. OFF Stop cranking and

wait for message to

appear.

a. Press and hold TEST button until CAL

b.

c .

appears. Release TEST button.

If VTM reads between -225 and +225,

offset test passes.

If offset test fails, see

TM 9-4910-571-12&P.

b. A number

c. .9.9.9.9

CIRCUIT

RESISTANCE

(in amps)

Beyond range of

VTM, cannot be

measured.

3. Press and release TEST button. d. Error message See see page 3-242.

4. When GO appears, turn MASTER SWITCH

to ON and crank engine for 2 seconds or

5. Turn MASTER SWITCH to OFF.

until one of the following appears on VTM: 6. Observe VTM reading.

a. If VTM reading is between 700 and 1275,

test passes.

b. If reading is erratic or cannot be obtained,

see TM 9-4910-571-12&P.

7. Return to troubleshooting.

END OF TASK

3-290 Change 4
TM 9-2350-261-20-1

STE/ICE-R TEST 73 BATTERY RESISTANCE - STE/ICE-R TEST

75 BATTERY RESISTANCE CHANGE (PACK)

INITIAL SETUP

Tools: Equipment Conditions:

STE/ICE-R Test Set (Item 71.1, App D) Engine stopped (see your -10)

Carrier blocked (see your -10)

Personnel Required: Battery cover removed (see your -10)

Unit Mechanic STE/ICE-R power hooked up (page 3-275)

STE/ICE-R starter circuit test hooked up

References: (page 3-279)

See your -10

TM 9-4910-571-12&P

1. Reposition current probe. DISPLAY PERFORM/RESULT

a.

b.

c.

d.

e.

Pull VTM switch to OFF.

Remove current probe from positive battery cable.

Connect current probe to cable connecting

series pair of batteries together.

Push VTM switch to ON.

Select TEST 73.

NOTE

Both TEST 73 and TEST 75 must be

performed to determine condition of series pair of batteries.

2. Perform offset test.

a. Press and hold TEST button until CAL

appears. Release TEST button.

b. If VTM reads between -225 and +225,

offset test passes.

c. If offset test fails, see

TM 9-4910-571-12&P.

3. Press and release TEST button.

4. When GO appears, crank engine for two

seconds or until one of the following appears

on display:

a. OFF

b. A number

Stop cranking and

wait for message to

appear.

BATTERY

RESISTANCE

(milliohms test 73;

milliohms/seconds

test 75)

c. .9.9.9.9 Beyond range of

VTM, cannot be

measured.

d. Error message See page 3-242

e. (- - - -) VTM lost power

during test.

Batteries may be

too weak. Try

powering VTM

using external

source.

5. Observe VTM reading.

a. If test 73 VTM reading is 25 or less, test

passes.

b. If test 73 VTM reading is over 25, test

fails.

c. If test 75 VTM reading is 50 or less, test

passes.

d. If test. 75 VTM reading is over 50, test

fails.

GO TO NEXT PAGE

Change 4 3-291
TM 9-2350-261-20-1

SULT

TEST 73

BATTERY

INTERNAL

RESISTANCE TEST RESULT

TEST 75

BATTERY

RESIS -

TANCE

CHANGE

TEST REPASS

PASS

FAIL

PASS

FAIL

PASS

FAIL FAIL

6. Select test 75.

7. Repeat steps 2 thru 5.

8. Determine condition of series pair of batteries

using table.

a. If batteries are in poor condition, go to

individual battery tests 77 and 79

(see TM 9-4910-571-12&P).

9. Return to troubleshooting.

END OF TASK

3-292 Change1
TM 9-2350-261-20-1

STE/ICE-R TEST 74 STARTER CIRCUIT RESISTANCE

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

All electrical accessories turned off

Unit Mechanic (see your -10)

Fuel OFF, engine must not start

(see your -10)

STE/ICE-R power booked up (page 3-275)

STE/ICE-R starter circuit test hooked up

(page 3-279)

References:

See your -10

TM 9-4910-571-12&P

1. Select TEST 74. DISPLAY PERFORM/RESULT

2. Perform offset test.

c.

Press and hold TEST button until CAL

appears. Release TEST button.

If VTM read6 between -225 and +225,

offset test passes.

If offset test fails, see

TM 9-4910-571-12&P.

a. OFF

a.

b.

b. A number

c. .9.9.9.9

Stop cranking and

wait for message to

appear.

CIRCUIT

RESISTANCE (in

milliohms)

Beyond range of

VTM, cannot be

measured.

3. Press and release TEST button. d. Error message See page 3-242

4. When GO appears, turn MASTER SWITCH

to ON and crank engine for 5 seconds or

5. Turn MASTER SWITCH to OFF.

until one of the following appears on VTM: 6. Observe VTM reading.

a. If VTM reading is between 5 and 27, test

passes.

b. If reading is erratic or cannot be obtained,

see TM 9-4910-571-12&P.

7. Return to troubleshooting.

END OF TASK

Change 4 3-293
TM 9-2350-261-20-1

STE/ICE-R TEST 90 DC CURRENT 0 TO 1500 AMPS

INITIAL SETUP

Tools:

STE/ICE-R Test Set (Item 71.1, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

TM 9-4910-571-12&P

Equipment Conditions:

Engine stopped (see your -10)

Carrier blocked (see your -10)

STE/ICE-R power hooked up (page 3-275)

STE/ICE-R starter circuit test hooked up

(page 3-279)

1.

2.

3.

4.

5.

NOTE NOTE

If current probe is below room temperature, wait at least 5 minutes after connecting probe to VTM before doing offset

test, or perform offset within 30 seconds

of starting each measurement.

Perform offset test.

Stray magnetic fields can affect the

current reading. Such fields may exist

within a foot or so of operating vehicle

generators and alternators, motor

generators under load, and electric

motors. Keep current probe at least one

foot away from any operating generators,

alternators, or electric motors.

a. Set TEST select switches to 90.

b. Push and hold TEST button until CAL

appears. Release TEST button.

c. If VTM reads between -225 and +225,

7. During offset test, the component being tested

must be off, and the circuit must be

de-energized.

offset test passes.

a.

b.

d. If offset test fails, see

Turn off component to be tested.

Install current probe where current is to

be measured.

TM 9-4910-571-12&P.

c.

Press and release TEST button.

d.

Turn on circuit used to condition current

probe. If starter is used to condition probe,

energize starter long enough to obtain a reading. Do not allow engine to start.

e.

Push and hold TEST button until CAL

appears. Release TEST button.

If VTM reads between -225 and +225,

offset test passes.

If offset test fails, see

TM 9-4910-571-12&P.

Note polarity sign of conditioning current. If

readout is negative (-), reverse current probe,

and repeat steps 1 thru 4.

Turn off circuit used to condition current

probe.

6. Perform offset test.

3-294 Change 1
TM 9-2350-261-20-1

8. Press and release TEST button.

9. Turn on component to be tested.

NOT E

If .9.9.9.9 appears on display, the test

current is greater than 1500 amps and

cannot be measured with STW/ICE-R.

If display reads a value with a minus sign,

current probe has been installed backwards. Repeat steps 1 thru 5. Be careful

not to reinstall current probe backwards.

10. Observe VTM reading.

a. If VTM reads between 250 and 425

amps, test passes.

b. If reading is erratic or cannot be

obtained, see TM9-4910-571-12&P.

11. Turn off component in step 9.

12. Return to troubleshooting.

END OF TASK

Change1 3-295(3-296blank 
TM 9-2350-261-20-1

CHAPTER 4

ENGINE-RELATED COMPONENTS MAINTENANC E

TASK INDE X

Task Page Tas k Page

Engine Oil Flow Diagram . . . . . . . . . . . . . . ..4–1 Replace Air Box Drain Hoses,

Tubes, and Fittings . . . . . . . . . . . . . . . . . . . . . . 4-9

Replace Front Engine Mount . . . . . . . . . ...4-2

Replace Engine Oil Filter Element

Replace Crankcase Breather

Collector Can and Hose . . . . . . . . . . . . . . . 4-11

and Parts .................................................. 4 -3

Replace Engine Oil Filter Assembly.................4-5

Replace Oil Filler Cap and Tube.... ............... ...4-13

Replace Engine Oil Filter Bracket,

Replace Oil Gage Rod and Guide....................4-15

Hoses, and Fittings . . . . . . . . . . . . . . . . . . . . . ...4-7

ENGINE OIL FLOW DIAGRA M

4-1
REPLACE FRONT ENGINE MOUN T

INITIAL SETUP

Tools: Personnel Required:

General Mechanics Tool Kit (Item 30, App D) Unit Mechanic

Torque Wrench (Item 96, App D)

References:

Materials/Parts: See your -10

Antiseize compound (Item 4, App C)

Sealing compound (Item 46, App C) Equipment Conditions:

Key washer (2) Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

REMOVE

1. Remove two screws (1), key washers (2), and

cap (3), from base (4) on engine (5). Discard

key washers.

2. Remove power plant (page 5-11).

3. Remove two self-locking bolts (6), washers

(7), from base (4) on engine (5). Remove base

(4) from engine (5).

INSTALL

4.

5.

6.

7.

8.

Apply a thin coat of antiseize compound and

sealing compound to cleaned threads of two

screws (1) and self-locking bolts (6).

Install base (4) on engine (5) with two selflocking bolts (6) and washers (7).

Install power plant (page 5-11).

Install cap (3) on base (4) with two new key

washers (2) and screws (l).

Tighten two screws (1) to 30-35 ft-lb

(41-48 N•m) torque. Tighten two self-locking

bolts (6) to 90-100 ft-lb (122-135 N•m)

torque. Use torque wrench.

END OF TASK

4-2

TM 9-2350-261-20-1 
TM 9-2350-261-20-1

REPLACE ENGINE OIL FILTER ELEMENT AND PART S

DESCRIPTION

This task covers: Remove (page 4-3). Install (page 4-4).

INITIAL SETUP

Tools Personnel Required

General Mechanics Tool Kit (Item 30, App D) Unit Mechanic

Torque Wrench (Item 96, App D) References

Materials/Parts see your -lo

Sealing compound (Item 46, App C) See your LO

REMOVE

1.

2.

3.

4.

5.

6.

7.

Place a suitable size container under oil filter

housing (1) .

Remove drain plug (2) from housing and

drain oil.

Back out retaining bolt (3). Remove housing

(1), element (4), and bolt (3) as an assembly.

Discard element (4) and gasket (5).

NOT E

If only filter element is being replaced go

to step 9.

Remove nut (6) from bolt (3).

Remove bolt (3) and gasket (7) from housing

(l). Discard gasket.

Remove element preformed packing (8) and

bolt (3). Discard preformed packing

Remove washer (9), spring (10) and retainer

(11) from bolt (3).

If needed, remove plug (12) from head (13).

Remove valve (14) and bushing (15) from filter head (13).

GO TO NEXT PAGE

4-3

Ga sket 

Gasket Equipment Conditions 

 Preformed packing Engine stopped/shutdown (see you r -10) 

Suitable container Driver's power plant access panel removed 

 (page 24-25) 

8 .

 9.
TM 9-2350-261-20-1

INSTALL

NOTE

If only filter element is being replaced do

steps 10, 13, 14, 15, 16, 21, and 22 only.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

Apply a thin coat of engine oil on new

gasket (l). Install gasket in falter head (2).

Install new gasket (3) on housing (4).

Install bolt (5) in housing (4).

Install washer (6), spring (7), new

preformed packing (8), and retainer (9) on

bolt (5). Secure with nut (10).

Place new filter element (11) very carefully

over bolt (5) in housing (4).

Install housing (4) with new element (11)

on head (2).

Install drain plug (12) in housing (4).

Tighten bolt (5) to 50-60 lb-ft (68-81 N•m)

torque. Use torque wrench.

Apply a thin coat of sealing compound to

cleaned external threads of plug (14) and

bushing (13).

If removed, install plug (14) in head (2).

Install bushing (13) in head (2).

(15) in bushing (13).

WARNING

Carbon Monoxide is poisonous and can kill you. Do not

idle engine with driver’s

power plant access panel

off unless there is VERY

GOOD AIR FLOW.

21.

22.

Start engine (see your -10). Check for oil

leaks.

Stop engine (see your -10). Wait about 20

minutes for oil to drain back to pan, then

check engine oil level. Add oil if needed

(see your LO).

FOLLOW-THROUGH STEPS

1. Install driver’s power plant access panel

(page 24-25).

END OF TASK

Install valve

4-4 
REPLACE ENGINE OIL FILTER ASSEMBL Y

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -10

see your Lo

Materials/Parts

Sealing compound (Item 46, App C) Equipment Conditions:

Engine stopped/shutdown (see your -10)

Personnel Required: Ramp lowered (see your -10)

Unit Mechanic Driver’s power plant access panel removed

(page 24-25)

1.

2.

3.

4.

5.

6.

7.

8.

9.

Place a container of suitable size under filter

assembly (1).

Remove drain plug (2) from filter assembly

(1). Allow engine oil to drain.

Disconnect oil hose (3) from elbow (4).

Remove elbow (4) from elbow (5).

Remove elbow (5) from filter assembly (1).

Disconnect oil hose (6) from elbow (7).

Remove elbow (7) from filter assembly (l).

Remove sampling valve (8).

Remove four screws (9), two washers (10),

four nuts (11), two clamps (12), and filter

assembly (1) from bracket (13).

INSTAL L

10. Apply a thin even coat of sealing compound

to cleaned external threads of elbows (4, 6,

and 7) before installation.

NOT E

Washers (10) are used on the two top

screws only.

11.

12.

Install filter assembly (1) and two clamps

(12) on bracket (13). Secure with four

screws (9), two washers (10), and four

nuts (11).

Install sampling valve (8).

GO TO NEXT PAGE

TM 9-2350-261-20-1 

REMOVE 

4-5 
TM 9-2350-261-20-1

13.

14.

15.

16.

17.

’180

19.

Install two elbows (1 and 2) in filter

assembly (3).

Install elbow (4) in elbow (l).

Connect oil hose (5) to elbow (2).

Connect oil hose (6) to elbow (4).

Install drain plug (7) in filter assembly (3).

Start engine

assembly for

WARNIN G

Carbon monoxide is poisonous and can kill you. Do not

idle engine with driver’s

power plant access panel

off unless there is VERY

GOOD AIR FLOW.

(see your -10). Check filter

leaks.

Stop engine (see your -10). Wait about

20 minutes for oil to drain back to pan.

Then check oil level. Add oil if needed

(see your LO).

FOLLOW-THROUGH STEPS

1. Install driver’s power plant access panel 2. Raise and lock ramp (see your -10).

(page 24-25).

3. Stop/shutdown engine (see your -10).

END OF TASK

4-6
TM 9-2350-261-20-1

REPLACE ENGINE OIL FILTER BRACKET, HOSES, AN D

FITTING S

DESCRIPTION

This task covers: Remove (page 4-7). Install (page 4-8).

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D)

Adjustable Wrench (Item 80, App D)

Open End Wrench, 1/2 x 9/16 inch

(Item 82.1 App D)

Materials/Parts:

Antiseize compound (Item 4, App C)

Sealing compound (Item 46, App C)

Tab washer (4)

See your -10

See your -LO

Equipment Conditions:

Engine stopped/shutdown (see your –10)

Carrier blocked (see your -10)

Power plant removed (page 5-1 1)

Engine oil filter assembly removed (page 4-5)

Differential oil filter assembly removed

(page 21-6)

Personnel Required:

Unit Mechanic

1.

2.

3.

4.

5.

Disconnect engine oil hose (1) from elbow (2)

and engine oil hose (3) from elbow (4). Use

adjustable and open end wrenches.

Remove two elbows (2, 4) from engine

block.

Remove screw (5), washer (6), nut (7), clamp

(8), and engine oil hose (1) from bracket (9).

Remove clamp (8) from engine oil hOSe (1).

Remove four screws (10), tab washers (11),

oil filler tube bracket (12), and bracket (9)

from transmission. Discard four tab washers.

GO TO NEXT PAGE

Change 1 4-7

REMOVE 
TM 9-2350-261-20-1

INSTALL

6.

7.

8.

Apply a thin coat of antiseize compound to

clean threads of four screws (l).

Place bracket (2) and oil filler tube bracket

(3) on transmission. Secure with four screws

(1) and new tab washers (4).

Apply a thin coat of sealing compound to

cleaned external threads of two elbows

(5 and 6).

9.

10.

11.

Install two elbows (5 and 6) in engine block.

Connect engine oil hose (7) to elbow (5)

engine oil hose (8) to elbow (6). Use

adjustable and open end wrenches.

Install clamp (9) on engine oil hose (7).

Secure clamp to bracket (2) with screw

washer (11), and nut (12).

and

 (10), 

FOLLOW-THROUGH STEPS

1. Start engine (see your -10). Check for leaks. 3. Install engine oil filter assembly (page 4-5).

2. Stop/shutdown engine (see your -10). Wait 4. Install differential oil falter assembly

about 20 minutes for oil to drain back to oil (page 21-6).

pan. Then check engine oil level

(see your -LO). Add oil if needed. 5. Install power plant (page 5-11).

END OF TASK

4-8
TM 9-2350-261-20-1

REPLACE AIR BOX DRAIN HOSES. TUBES. AND FITTINGS

DESCRIPTIO N

This task covers: Remove (page 4-9). Install (page 4-10).

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Socket Set, (Item 89, App D)

Torque Wrench, (Item 95, App D) Equipment Conditions:

Personnel Required:

Unit Mechanic

Power plant removed (page 5-11)

Starter removed (page 10-2)

REMOV E

1.

2.

3.

4.

5.

6.

Remove three screws (1), two washers (2),

and three clamps (3), that secure two drain

hoses (4 and 5) to engine.

Loosen two hose clamps (6 and 7) on two

drain hoses (4 and 5).

Disconnect two drain hoses (4 and 5) from

two tube assemblies (8 and 9).

Remove two hose clamps (6 and 7) from two

drain hoses (4 and 5).

Remove two tube assemblies (8 and 9) from

elbows (10 and 11).

Remove two drain hoses (4 and 5) from container bracket (12).

GO TO NEXT PAGE

Change 4 4-9
TM 9-2350-261-20-1

INSTALL

7. Connect two tubs assemblies (1 and 2) to

two elbows (3 and 4).

8. Install two hose clamps (5 and 6) on two

drain hoses (7 and 8).

9.

10.

11.

12.

Connect two drain hoses (7 and 8) to two

tube assemblies (1 and 2).

Tighten two hose clamps (5 and 6) on two

drain hoses (7 and 8).

Install two drain hoses (7 and 8) on container bracket (9).

Install two drain hoses (7 and 8) in engine

block. Secure with three screws (10), two

washers (11), and three clamps (12).

Tighten screws to 180-216 lb-in torque. Use

torque wrench and socket set.

NOTE

If elbows 3 and 4 need to be replaced,

notify direct support maintenance.

FOLLOW-THROUGH STEPS

1. Install starter (page 10-2). 2. Install power plant (page 5-11).

END OF TASK

4-10 Change 4
TM 9-2350-261-20-1

REPLACE CRANKCASE BREATHER COLLECTOR CAN AND HOSE

DESCRIPTION

This task covers: Remove (page 4-11). Install (page 4-12).

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -10

Socket Wrench Set (Item 89, App D) see your Lo

Torque Wrench (Item 95, App D)

Equipment Conditions:

Materials/Parts: Engine stopped/shutdown (see your -10)

General lubricating oil (Item 16, App C) Carrier blocked (see your -10)

Tab washer (2) Power plant rear access panel removed

(page 24-27 or 24-29)

Personnel Required: Driver’s power plant access panel removed

Unit Mechanic (page 24-26)

REMOVE

1.

2.

3.

4.

6.

Disconnect two drain hoses (11 and 12) from

collector can bracket (10).

Remove two wing nuts (13), washers (14),

retainer (15), collector can (16), and element

(17) from collector can bracket (10).

Remove two screws (18), tab washers (19),

and collector can bracket (10)

transmission. Discard tab washers.

GO TO NEXT PAGE

4-11

Remove two screws (1), washer (2), nut (3), 

two clamps (4), clamp (5), and breather hose 

(6) from power plant disconnect bracket and 

from engine. 

Remove screw (7), clamp (8), nut (9), and

breather hose (6) from collector can 

bracket. 
TM 9-2350-261-20-1

INSTALL

6.

7.

8.

9.

10.

11.

Install collector can bracket (1) on

transmission case. Secure with two screws

(2) and new tab washers (3). Tighten

screws (2) to 252-800 lb-in (28-34 N•m)

torque. Loosen screws and retighten to

above torque. Use torque wrench and socket

set.

Install clean element (4) in collector can (6).

Install collector can (5) on bracket (l).

Secure with retainer (6), two washers (7),

and wing nuts (8). Stake top threads of

retainer studs after installing wing nuts (8).

Install two drain hoses (9 and 10) in collector can bracket (1).

Install breather hose (11) in collector can

bracket (1). Secure with screw (12), clamp

(13), and nut (14).

Install breather hose (11) on engine and on

power plant disconnect bracket. Secure with

two clamps (15), clamp (16), washer (17),

nut (18), and two screws (19).

1. Install power plant rear access panel 2. Install driver’s power plant access panel

(page 24-27 or 24-29). (page 24-25).

END OF TASK

4-12

FOLLOW - THROUGH- STEPS 
TM9-2350-261-20-1

REPLACE OIL FILLER CAP AND TUB E

DESCRIPTION

This task covers: Remove (page 4-13). Install (Page 4-14).

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -10

Materials/Parts: Equipment Conditions:

Gasket Engine stopped/shutdown (see your -10)

Key washers (3) Carrier blocked (see your -10)

Self-locking nut Ramp lowered (see your -10)

Power plant rear access panel removed

Personnel Required: (page 24-27 or 24-29)

Unit Mechanic Driver’s power plant access panel removed

(page 24-25) . -

REMOVE 4.

1.

2.

3.

Remove screw (l), locknut (2), clamp (3),

chain (4), and sleeve (5) from filler neck (6). 5.

Discard locknut.

Remove filler cap (7) with chain (4).

Remove screw (8), clamp (9), and filler neck

Remove two clamps (11) and hose (12) from

filler neck (6) and eIbow (13).

Remove three screws (14), key washers (15)

gasket (16), and elbow (13), from engine

block. Discard key washers and gasket.

GO TO NEXT PAGE

4-13

 ( 5) from hydraulic reservoir (10). 
TM 9-2350-261-20-1

REPLACE OIL FILLER CAP AND TUB E

DESCRIPTION

This task covers: Remove (page 4-13). Install (Page 4-14).

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -10

Materials/Parts: Equipment Conditions:

Gasket Engine stopped/shutdown (see your -10)

Key washers (3) Carrier blocked (see your -10)

Self-locking nut Ramp lowered (see your -10)

Power plant rear access panel removed

Personnel Required: (page 24-27 or 24-29)

Unit Mechanic Driver’s power plant access panel removed

(page 24-25)

REMOVE 4.

1.

2.

3.

Remove screw (l), locknut (2), clamp (3),

chain (4), and sleeve (5) from filler neck (6). 5.

Discard locknut.

Remove filler cap (7) with chain (4).

Remove screw (8), clamp (9), and filler neck

Remove two clamps (11) and hose (12) from

filler neck (6) and eIbow (13).

Remove three screws (14), key washers (15)

gasket (16), and elbow (13), from engine

block. Discard key washers and gasket.

GO TO NEXT PAGE

4-13

 ( 5) from hydraulic reservoir (10). 
TM 9-2350-261-20-1

REPLACE OIL GAGE ROD AND GUID E

INITIAL SETUP

Tools: Equipment Conditions:

General Mechanics Tool Kit (Item 30, App D) Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Materials/Parts: Driver’s compartment access panel removed

Sealing compound (Item 52, App C) (see your -10)

Self-locking nut Power plant rear access panel removed

(see your -10)

Personnel Required:

Unit Mechanic

Power- plant bottom access cover removed

(page 24-32)

References:

see your -10

REMOVE

1. Remove gage rod (1) from gage rod guide (2).

2. Remove lock nut (3), screw (4), washer (5),

clamp (6), and gage rod guide (2) from

bracket (7). Discard locknut.

3. Remove gage rod guide (2) from adapter (8).

4. Remove adapter (8) from engine block.

NOTE

Plug or cover engine block opening to

prevent dirt or debris from entering

engine.

INSTALL

5.

6.

7.

Apply a thin coat of sealing compound to external threads of adapter (8).

Install adapter (8) in engine block.

Install gage rod guide (2) in adapter (8).

8.

9.

Install gage rod guide (2) on bracket (7).

Secure with clamp (6), screw (4), washer (5),

and new locknut (3).

Install gage rod (1) in gage rod guide (2).

FOLLOW-THROUGH STEPS

1. Install driver’s compartment access panel 3. Install power plant bottom access cover

(see your -10). (page 24-32).

2. Install power plant access panel

(see your -10),

END OF TASK

4-15 (4-16 blank)
TM 9-2350-261-20-1

CHAPTER 5

POWER PLANT MAINTENANC E

TASK INDE X

Tas k

Raise/Lower Power

Page Tas k

Plant Grill . . . . . . . ...5-2 Remove and Install Power

Page

Plant . . . . ...5-11

5-1 
TM 9-2350-261-20-1

RAISE/LOWER POWER PLANT GRIL L

DESCRIPTIO N

This task covers: Raise (page 5-2). Lower (page 5-6).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Antifreeze and Battery Tester,

(Item 74, App D)

Socket Wrench Set (Item 90, App D)

Torque Wrench (Item 97, App D)

Torque Wrench (Item 98, App D)

Materials/Parts:

Antifreeze (Item 8, App C)

Caulking compound (Item 8, App C

Self-locking nut (2)

Tab washers (4)

Personnel Required:

Unit Mechanic

Helper (H)

References:

see your -lo

TM 92350-300-10

Equipment Conditions

Engine stoppedlshutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Driver’s power plant access panel removed

(page 24-25)

Power plant rear access panel removed

(page 24-27 or 24-29)

Generator set removed (M577A2 only)

(see your -10)

Battery ground lead disconnected (page 13-2)

RAISE GRIL L

1.

2.

Release four latches (1). Remove air cleaner

housing (2) and element (3) from cover (4).

Disconnect electrical cable (5) at driver’s

compartment bulkhead. Remove screw (6),

clamp (7), and cables from weldnut (8).

5-2
3.

4.

Loosen two clamps (1). Disconnect two hOSeS

(2 and 3) from air cleaner cover (4) and

engine intake elbow (5).

Disconnect air indicator hose (6) from adapter

(7) at driver’s compartment bulkhead.

TM 9-2350-261-20-1

WARNING

Do not touch hot exhaust

pipes with bare hands.

could get a bad burn.

5. Remove four screws (8), tab

exhaust extension (10) from

You

washers (9), and

power plant

6. Remove radiator cap (see your -10). Open

valves (11) and drain coolant into a container

with capacity of 15 gallons (57 liters)

or more.

GO TO NEXT PAGE

5-3
TM 9-2350-261-20-1

7. Loosen two clamps (1). Disconnect hose (2)

from auxiliary tank (3).

8. Loosen two clamps (4). Disconnect two deaeration hoses (5) from auxiliary tank (3).

9. Loosen two clamps (6). Disconnect hose (7)

from tube (8). -

10.

11.

12.

Loosen two clamps (9). Disconnect hose (10)

from radiator elbow (11).

—

Remove drive belts (12) by loosening locknut

(13) that secures rod end (14) to adjusting

nut (15).

Remove drive belts (12) from idler pulleys

(16 and 17) and pulleys (18 and 19).

5-4
13.

14.

On M577A2 only, remove six screws (1),

eight washers (2), two locknuts (3), and

generator enclosure (4) from hull. Discard

locknuts.

On M577A2 only, remove generator

enclosure (4) from hull with davit used to

remove the generator (see your -10).

TM 9-2350-261-20-1

NOT E

On M741A1, armament station gun must

point to rear (see TM 9-2350-300-10).

15.

16.

Remove 13 screws (5) and washers (6) that

secure grill (7). Remove screw (8) that

secures lifting eye (9) to hull.

Stow power plant front access door brace

(10). Lay access door (11)

plant grill (7).

back on power

17. Use a lifting device (12) to raise grill (7) to

vertical position.

GO TO NEXT PAGE

5-5
TM 9-2350-261-20-1

CAUTION

To prevent damage to power plant front

access door, guide the door as the power

plant grill is lowered into braced position.

18. Remove screw

cure brace (3)

(1) and locknut

to lug (4).

(2) that se19. Lower power plant grill (5) into full open

position. Place brace (6) between two lugs

(7). Secure with screw (8) and locknut (9).

LOWER GRILL

NOTE

Before lowering grill, apply caulking compound to metal joints between hull and

lower support of grill to assure water

tightness.

20. With lifting device attached to grill (5),

remove screw (8), locknut (9), and brace (6)

from two lugs (7).

21. Secure brace (10) to lug (11) with screw

(12) and locknut (13).

CAUTION

To prevent damage to power plant wiring

harness, guide the door as the power

plant grill is lowered into braced position.

22. Use lifting device (14) to lower grill (15)

into closed position.

5-6
TM 9-2350-261-20-1

Secure power plant front access door (1) in

open position with door brace (2).

Secure grill (3) to hulI with 13 screws (4)

and washers (5). Tighten 13 screws to

100-120 lb-ft (136-163 N•m) torque. Use

torque wrench (Item 97).

Install lifting eye screw (6) on lifting eye (7)

and hull. Tighten lifting eye screw to

176-200 lb-ft (237-271 N•m) torque. Use

torque wrench (Item 98)

set.

and socket wrench

26.

27.

On M577A2 only, position generator enclosure (8) on hull with davit used to lift generator (see your -10).

On M577A2 only, secure generator enclosure

(8) to hull with six screws (9), eight

washers (10), and two new locknuts (11).

Tighten four screws that secure rear

enclosure to hull to 56-60 Ib-ft (75-81 N•m)

torque. Use torque wrench (Item 97).

GO TO NEXT PAGE

5-7

23. 

24.

25 .
TM 9-2350-261-20-1

28.

29.

Position matched set of drive belts (1) on

pulleys (2 and 3) and idler pulleys

(4 and 5).

Turn adjusting nut (6) on rod end (7) to left

or right until lower end is within operating

range shown on

locknut (8) .

adjusting sleeve. Tighten

30.

5-8

Position hose (9) on elbow (10) and tighten

two clamps (11).

31. Position hose (12) on tube (13) and tighten

two clamps (14).

32.

33.

Secure two hoses (15) to auxiliary tank (16)

with two clamps (17).

Position hose (18) on auxiliary tank (16)

and tighten two clamps (19).
34. Secure exhaust extension (1) to power plant

grill with four new tab washers (2) and

screws (3).

36.

35. Connect air indicator hose (4) to adapter (5)

at driver’s compartment bulkhead.

TM 9-2350-261-20-1

Position hose (6) on engine air intake

elbow (7). Position hose (8) on air cleaner

cover (9). Secure with two clamps (10).

37.

38.

39.

40.

Position air cleaner housing (11) and element (12) on air cleaner cover (13) with

housing drain hole in down position.

Secure housing (11) and element (12) to

cover (13) with four latches (14).

Secure electrical cable (15) to weldnut (16)

with screw (17) and clamp (18).

Connect electrical cable (15) to receptacle at

driver’s compartment bulkhead.

GO TO NEXT PAGE

5-9
TM 9-2350-261-20-1

41. Close thermostat housing valves (1).

NOTE

Use coolant in cooling system at all times.

It will reduce corrosion in engine block

and cooling will provide low temperature

protection. Mix coolant and clean water

based on the requirements for your

carrier. Use tester.

42. Fill cooling system slowly with 14 gallons

(53 liters) of coolant and water until level is

within 1/2 inch (13 mm) of filler neck

(page 3-5).

49. Replace coolant filler cap (see your -10).

WARNING

Carbon monoxide is poisonous and can kill you. Do not

idle engine with power

plant access panels off

unless there is a VERY

GOOD AIR FLOW.

44. Connect battery ground lead (page 13-2).

45. Start engine (see your -10). Check that

power plant grill is installed properly and

the cooling system does not leak.

WARNING

Hot radiator coolant can

burn you. Use hand to

remove cap ONLY if cool to

touch. Turn cap slowly to

release pressure. Replace

cap by pressing down and

turning until tight.

46. Check coolant level (see your -10).

FOLLOW-THROUGH STEPS

1. Engine stopped/shutdown (see your -10). 4.

2. Install power plant rear access panel

(page 24-27 or 24-29). 5.

3. Install driver’s power plant access panel 6.

(page 24-25).

Close power plant front access door

(see your -10).

Raise trim vane (see your -10).

Install generator set (M577A2 only)

(see your -10).

END OF TASK

5-10 
TM 9-2350-261-20-1

REMOVE AND INSTALL POWER PLAN T

DESCRIPTION

This task covers: Remove (Page 5-11). Install (Page 5-17).

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D)

Torque Wrench Adapter

(Items 7, 8 and 9, App D)

Engine and transmission sling

(Item 65, App D

Socket wrench set (Item 89, App D)

Torque Wrench (Item 96, App D)

Torque Wrench (Item 96, App D)

Materials/Parts:

see our - 10

see your -12

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panels removed

(page 24-27 or 24-29)

Driver's power plant access panel removed

Key washer (2) (page 24-25)

self-locking bolt (2) Power plant bottom access cover removed

screw (4) (page 24-32)

Washer (4) All coolant drained (page 8-3)

Power plant grill raised (page 5-2

Personnel Required: Fuel supply valve at tank closed

Unit Mechanic

Helper (H)

(see your -10)

Air control valve and housing assembly

removed (page 7-11)

REMOVE

1. Disconnect three electrical cables

driver’s compartment bulkhead.

NOTE

On carriers with exhausts as

Figure A,go to step 3.

2.

(1) at

9.

shown in

Loosen two clamps (2) and remove pipe joint

(3) from muffler (4) and exhaust pipe (5).

Loosen two clamps (6). Remove exhaust

pipes (5 and 7).

GO TO NEXT PAGE

5-11
TM 9-2350-261-20-1

4.

5.

Disconnect differential oil temperature lead (1)

from differential.

Disconnect oil inlet hose (2) from differential.

7. Remove two screws (4), key washers (5), and

cap (6) from mount base (7). Discard key

washers.

8. Remove two lockbolts (8) and washers (9)

that secures engine

Discard lockbolts.

mount base to carrier.

6. Disconnect starter ground lead (3) from hull.

9. Disconnect accelerator pedal linkage (10) and

range selector linkage (11) from

bellcranks (12).

5-12
10. Loosen two setscrews (1) that secures fuel

cutoff control cable (2) to governor arm

pin (3).

13.

14.

TM 9-2350-261-20-1

Remove four screws (13) and flat washers

(14). Separate propeller shaft (15) from yoke

(16) on transmission. Discard screws and

washers.

Remove L&R final drive propeller shafts

(page 20-5 and 20-7).

15. Remove nut (17), washer (18), screw (19),

clamp (20), and radiator inlet tube (21)

from hanger (22).

11. Remove nut (4), screw (5), washer (6), and

clamps (7) from engine cylinder head cover

bracket (8).

12. Remove screw (9) and nut (10). Pull cable

(11) through clamp (12).

16. Disconnect ramp hydraulic line at coupling (23).

GO TO NEXT PAGE

Change 4 5-13
TM 9-2350-261-20-1

17. Disconnect ramp hydraulic line at coupling (1).

19. Disconnect tachometer cable (2) from

adapter (3) on engine.

18. Deleted.

20. Remove screw (4), nut (5), washer (6),

clamp (7), and tachometer cable (2) from

tank tube clamp (8).

5-14 Change4
TM 9-2350-261-20-1

21. Disconnect two fuel hoses at couplings (1). 23.

.

24.

25.

WARNING

Damaged lifting slings can

fail with load. Soldiers can

be killed or injured. Do not

use damaged slings.

Remove clip pin (6) from headed pin (7) at

transfer gearcase right mount.

Remove nut (8) and washer (9) from

transfer gearcase left mount.

Raise power plant slightly to permit removal

of headed pin (7) from transfer gearcase

right mount. Have helper assist.

22. Attach power plant sling’s two 6 link chains

(2) to lifting eyes (3) on engine, and one 17

link chain (4) to lifting eye (5) on transfer

gearcase.

GO TO NEXT PAGE

5-15
TM 9-2350-261-20-1

26. Remove four clamps (1) and two hoses (2)

from deaeration elbow (3) and tube (4).

30. From underneath carrier, disconnect

(12) from differential oil pump (13).

27.

28.

29.

.

Remove four clamps (5) and two hoses (6)

from oil cooler elbow (7) and tube (8).

Remove tubes (4 and 8) through power

plant front access door opening.

Remove two clamps (9) and hose (10) from

oil cooler elbow (7) and vent tube (11).

hose

lifted for

WARNING

Hanging loads can kill or

injure you. Keep away from

hanging loads and overhead equipment. Keep

hands out of compartment

while power plant is being

removal or lowered for

installation.

31. Remove power plant from carrier. Have

helper assist.

5-16
TM 9-2350-261-20-1

INSTAL L

WARNING

Damaged lifting sling can

fail with load. Soldiers can

be killed or injured. Do not

use damaged slings.

32. If required, attach power plant sling’s two 6

link chains (1) to lifting eyes (2) on engine

and one 17 link chain (3) to lifting eye (4)

on transfer gearcase.

WARNING

Hanging loads can kill or

injure you. Keep away from

hanging loads and overhead equipment. Keep

hands out of compartment

while power plant is being

removal or lowered for

installation.

33. Lower power plant into earner. Have helper

assist. Do not detach sling.

34. From underneath carrier, connect hose (5) to

differential oil pump (6).

GO TO NEXT PAGE

mm u I II

5-17

\ 1/ I

lifted for 
35.

36.

37.

38.

Install tubes (1 and 2) through power plant

access door opening.

Connect tube (1) to oil cooler elbow (3) and

radiator with four clamps (4) and two

hoses (5).

Connect vent tube (6) to oil cooler elbow (3)

with two clamps (7) and hose (8).

connect tube

radiator with

hoses (11).

(2) to deaeration

 four clamps (10) and two

39. Raise power plant slightly and install

headed pin (12) in transfer gearcase right

mount.

40.

41.

42.

(14) in front engine mount base. Tighten

lockbolts to 120-130 Ib-ft (162-176 N•m)

torque. Use torque wrench (Item 96).

elbow (9) and

Lower power plant and remove lifting sling.

Install two washers (13) and new lockbolts

Install cap (15) with two new key washers

(16) and screws (17). Tighten screws to

30-35 lb-ft (41-48 N•m) torque. Use torque

wrench (Item 96).

TM 9-2350-261-20-1 

5-18 
TM 9-2350-261-20-1

43.

44.

45.

Install washer (1) and nut (2) on transfer

gearcase left mount.

Tighten nut (2) to 75-80 lb-ft

(102-108 N•m) torque. Use torque wrench

(Item 96) and socket wrench set.

Install clip pin (3) on headed pin

transfer gearcase right mount.

(4) at

47. Install tachometer cable (6) on tank with

clamp (7), clamp (8), washer (9) nut (10)

and screw (11).

48. Connect tachometer cable (6) to engine

adapter (12).

46. Connect two fuel hoses at couplings (6).

49. Connect ramp hydraulic lines at couplings (13) (M741A1 only).

M741A1 ONLY

GO TO NEXT PAGE

5-19

4
50.

51.

Connect ramp hydraulic line at coupling (1)

(all except M741A1).

Connect ramp hydraulic line at coupling (2)

(all except M741A1).

52. Install clamp (3), on radiator inlet tube (4).

Secure clamp to hanger (5) with washer (6),

screw (7), and nut (8).

NOTE

Screws and washers must be clean, dry,

and free of lubricants and paint. If your

carrier is equipped with 6C universal

joints, screws are 3/8-24 x 1-3/4; if

equipped with 7C universal joints, screws

are 1/20 x 2.

53. Connect propeller shaft (9) to transmission

with four new flat washers (10) and four

new screws (11). Use torque wrench

(Item 96) and adapter to tighten screws. On

6C universal joints, tighten to 35-40 lb-ft

(47-54 N•m) torque, and on 7C joints,

tighten to 83-100 lb-ft (113-136 N•m)

torque, then loosen screws and tighten them

to the correct torque again. See page 2-29

for correct readings on torque wrenches with

adapters.

54. Install L&R final drive propeller shafts

(page 20-5 and 20-7).

I

TM 9-2350-261-20-1 

5-20 
55.

56.

67.

Install control cable (1) in clamp (2). Secure

with screw (3) and nut (4).

Fasten control cable (1) to engine

cylinder-head cover bracket (5) with two

clamps (6), washer (7), screw (8), and

nut (9).

Tighten setscrews (10) that secures fuel

cutoff control cable (11) to governor arm

pin (12).

58.

59.

TM 9-2350-261-20-1

Connect accelerator pedal linkage (13) and

range selector linkage (14) to bellcranks (15).

Connect starter ground lead (16) to hull.

60. Connect differential oil inlet hose (17) to

differential.

61. Connect differential oil temperature lead (18)

to differential.

GO TO NEXT PAGE

5-21
TM 9-2350-261-20-1

NOTE

On carriers with exhausts as

Figure A, go to step 63. 

62. Install pipe joint (1) on muffler

63.

shown in

(2) and exhaust pipe (3). Secure with two clamps (4).

64.

Install exhaust pipes (3 and 5) on engine

exhaust manifolds. Secure with two clamps

(6). Tighten clamps to 192-216 lb-in

(22-24 N•m) torque. Use torque wrench

(Mire 95) and socket wrench set.

Connect three electrical cables (7) at driver’s

compartment bulkhead.

FOLLOW-THROUGH STEPS

1.

2.

3.

4.

6.

6.

7.

Install air control valve and housing assembly 8. Start engine (see your -10). Check for leaks

(page 7-11). and proper installation.

Open fuel supply valve at tank

(see- your -10).

9.

10.

Connect battery ground lead (page 13-2).

Lower grill (page 6-2). 11.

Fill cooling system (page 8-3).

12.

Adjust fuell control cutoff cable (page 23-44).

Check installation and operation of controls.

Stop/shutdown engine (see your -10).

Install power plant bottom access cover

(page 24-32).

Install power plant rear access panels

(page 24-27 or 24-29).

Install driver’s power plant access panel

(page 24-25).

END OF TASK

5-22 
TM 9-2350-261-20-1

Section

CHAPTER 6

FUEL SYSTEM MAINTENANC E

I . FUEL SYSTEM HOSE REPLACEMENT, DIAGRAMS ,

AND TEST S

TASK INDE X

Tas k Page Tas k Page

Fuel Flow Diagram (M113A2, Fuel Flow Diagram

M125A2, M106A2, and M741A1 (M577A2 and M1068 Only) . . . . . . . . . . . 6 - 2

with Inside Tank or Compartment) . . ...6-1 Fuel Flow Diagram (M981 and

M1064 with External Fuel Tanks) . . . ...6-3

FUEL FLOW DIAGRAM (M113A2, M125A2, M106A2, AND M741A1

WITH INSIDE TANK OR COMPARTMENT )

 SUPPLY FLOW 

 RETURN FLOW 

GO TO NEXT PAGE

Change 3 6-1

II lInx Awl I
TM 9-2350-261-20-1

FUEL FLOW DIAGRAM (M577A2 AND M1068 ONLY)

6-2 Change 3
TM 9-2350-261-20-1

FUEL FLOW DIAGRAM (M981 AND M1064 WITH EXTERNA L

FUEL TANKS )

1 I

GO TO NEXT PAGE

i

Change 2 6-3 
TM 9-2350-261-20-1

Section II. INSIDE FUEL TANK AND HOSES, TUBES, AN D

 FITTINGS (M113A2, M1059, M577A2, M1068, AND M901A1 ONLY) -

TASK INDE X

Tas k Page

Drain Fuel Tank (M113A2, M901A1,

and M1059 Only) l.................................... 6 -5

Replace Combat Filler Cover and

Lock (M113A2, M1059, M577A2,

 M1068, and M901A1 Only) . . . . . . . . . . . ...6-7

Replace Filler Cap and Strainer

Parts (M1059, M113A2, M577A2,

 M1068, and M901A1 Only) . . . . . . . . . . . ...6-8

Replate Fuel Quantity Transmitter

(M113A2, M901A1, and

M1059 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 -9

Task Page

Replace Fuel Tank (M113A2,

M901A1, and M1059 Only) . . . . . . . . . . . 6-11

Temporary Fuel Tank Repair

(M113A2, M1059, M901A1,

M1068, and M577A2 Only) ........................................ 6-21

Replace Fuel Tank-To-Bulkhead

Hoses, Tubes, and Fittings

(M113A2, M901A1, and

M1059 Only) ....................................... . . . . . . . .6-23

6-4 Change 3
TM 9-2350-261-20-1

DRAIN FUEL TANK (M113A2, M901A1, AND M1059 ONLY)

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Hose assembly (Item 37, App D)

Materials/Parts:

Wiping rag (Item 61, App C)

Suitable size containers at least 95 gal.

capacity

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Carrier blocked (see your -10)

DRAIN

1. Place metal container (1) of suitable capacity

directly behind carrier to the left of lowered

ramp.

8. Turn fitting (6) on valve (4) to close drain

valve.

9. Install fuel filler cap and close filler combat

cover (2) (see your -10).

2.

3.

4.

5.

6.

7.

WARNING

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Use wiping rag to wipe up any spilled fuel.

Place container (1) against side of lowered

ramp and rear of carrier to get

metal-to-metal contact. Make sure there is a

good ground.

Open fuel filler combat cover (2) and remove

filler cap (see your -10).

Remove square head pipe plug (3) from drain

valve (4).

Attach drain hose (5) to drain valve. Place

open end of hose (5) in container (1).

Turn square fitting (6) on valve (4). Drain

fuel from tank.

When tank is drained, remove drain hose (5)

from valve (4). Insert plug (3).

GO TO NEXT PAGE

6-5
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1. After maintenance has been performed, fill 2.

fuel tank (see your -10).

2. Connect battery ground lead (page

3.

13-2).

4.

Start engine (see your -10).

Raise and lock ramp (see your -10).

Stop/shutdown engine (see your -10).

END OF TASK

I ll\x/I

6-6

n
TM 9-2350-261-20-1

REPLACE COMBAT FILLER COVER AND LOC K

(M113A2, M1059, M577A2, M1068, AND M901A1 ONLY)

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions:

spring pin Engine stopped/shutdown (see your -10)

Spring pin Ramp lowered (see your -10)

Personnel Required:

Unit Mechanic

REMOVE

1.

2.

3.

4.

NOTE

If threads on thumbscrew were previously deformed, do step 1.

Grind away deformed threads on

thumbscrew (l). Remove wing nut (2) and

thumbscrew.

Loosen wing nut (2) and thumbscrew (1)

above fuel tank inside earner.

Remove spring pin (3) and cover (4) from top

of hull. Discard spring pin.

Remove spring pin (5), washer (6), pin (7),

and spring (8) from cover (4). Discard spring

pin. “

INSTAL L

5.

NOTE

If thumbscrew and wing nut were

removed, do step 5.

Screw wing nut (2) on thumbscrew (1) and

install thumbscrew inside carrier (4). Deform

threads on thumbscrew. Tighten wing nut.

6.

7.

8.

Secure spring (8), pin (7), and washer (6) to

cover (4) with new spring pin (5).

Secure cover (4) to hull with new spring

pin (3).

Turn thumbscrew (1) into lock position.

Tighten wing nut (2).

FOLLOW-THROUGH STEPS

1. Raise and lock ramp (see your -10). 2. Stop/shutdown engine (see your -10).

END OF TASK

Change 3 6-7
TM 9-2350-261-20-1

REPLACE FILLER CAP AND STRAINER PARTS (M1059, M113A2 ,

M577A2, M1068, AND M901A1 ONLY)

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Non-electrical wire (Item 31, App C)

Gasket

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Combat filler cover and lock open

(see your -10)

REMOV E

1.

2.

3.

4.

Unfasten fuel filler cap and chain assembly

(1) from filler neck (2).

Compress C ring (3) and remove from filler

neck (2).

Remove lockwire (4), 12 screws (5), filler neck

(2), strainer (6), retainer (7), and filler cap

and chain assembly (1) from hull top. Discard

lockwire.

Loosen clamp (8) that secures boot (9) to in7.

8.

9.

Install new lockwire (4) through heads of 12

screws (5). Secure with double twist method.

Compress C ring (3) and install through filler

neck (2).

Fasten filler cap and chain assembly (1) in

filler neck (2).

side fuel tank. Remove boot through top of

hull.

INSTAL L

5.

6.

Aline mounting holes in boot (9) with mounting holes in hull top. Secure boot (9) to inside

fuel tank neck with clamp (8).

Secure filler neck (2), retainer (7), strainer

(6), and filler cap and chain assembly (1) to

hull top with 12 screws (5).

FOLLOW-THROUGH STEP S

1. Connect battery ground lead (page 13-2). 2. Combat filler cover closed and locked

(see your -10).

END OF TASK

6-8 Change 3
TM 9-2350-261-20-1

REPLACE FUEL QUANTITY TRANSMITTER (M113A2, M901A1 ,

AND M1059 ONLY)

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your –10

Materials/Parts: Equipment Conditions:

Nonelectrical wire (Item 31, App C) Engine stopped/shutdown (see your -10)

Gasket Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Personnel Required: Fuel tank drained (page 6-5 )

Unit Mechanic

REMOVE

1.

2.

3.

Disconnect circuit 28 lead (1) from

transmitter (2).

Remove lock wire (3) from five screws (4).

Discard lock wire.

Remove five screws (4), washers (5),

transmitter (2), and gasket (6) from fuel

tank (7). Discard gasket.

INSTALL

4.

5.

6.

7.

8.

Place new gasket (6) and transmitter (2) in

fuel tank (7). Secure with five washers (5)

and screws (4).

Secure five screws (4) with new lockwire. See

figure A.

Connect circuit 28 lead (1) to transmitter (2).

Fill fuel tank (see your -10).

Check fuel tank for leaks.

GO TO NEXT PAGE

6-9
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1.

2.

Connect battery ground lead (page 13-2). 3. Check that fuel quantity transmitter works

properly (see your -10).

Raise and lock ramp (see your -10).

4. Stop/shutdown engine (see your -10).

END OF TASK

6-10
TM 9-2350-261-20-1

REPlACE FUEL TANK (M113A2, M901A1, AND M1059 ONLY)

DESCRIPTION

This task covers: Remove (page 6-11). Disassemble (page 6-14). Clean, Inspect, and Repair

(page 6-15). Assemble (page 6-15). Install (page 6-17).

INITIAL SETUP

Tools: Personnel Required: (cont):

General Mechanics Tool Kit (Item 30, App D) Helper (H)

Socket Wrench Set (Item 89, App D)

Torque Wrench (Item 95, App D) References:

Torque Wrench (Item 97, App D) See your -10

Materials/Parts: Equipment Conditions:

Sealing compound (Item 46, App C)

Tab washer (10) Engine stopped/shutdown (see your -10)

Cotter pin Carrier blocked (see your -10)

Lockwasher (6) Ramp lowered (see your -10)

Self-locking nut (6) Battery ground lead disconnected (page 13-2)

Fuel tank drained (page 6-5)

Personnel Required: Fuel filler neck and boot removed (page 6-8)

Fuel quantity transmitter removed (page 6-9)

Unit Mechanic

1.

2.

3.

4.

5.

NOT E

Permanent fuel tank repair is authorized

at depot only. For temporary repair

(page 6-21).

Remove two screws (1), lockwashers (2), and

wiring harness cover (3) from fuel tank (4).

Discard lockwashers.

Remove two screws (5), Iockwashers (6),

locknuts (7), and access cover (8) from

cover (3). Discard lockwashers and locknuts.

Remove three screws (9), locknuts (10),

clamps (11), and wiring harness (12) from

cover (3). Discard locknuts.

Remove two screws (13), three lockwashers

(14), ground lead (15), and wiring harness

guard (16) from hull. Discard lockwashers.

Remove two screws (17), locknuts (18),

clamps (19), and wiring harness (12) from

guard (16). Discard locknuts.

GO TO NEXT PAGE

6-11

REMOVE 
TM 9-2350-261-20-1

6.

7.

8.

9.

Remove two clips (1), harness (2), screws (3),

and cradles (4) from front end of fuel

tank (5).

Remove screw (6), two washers (7), clamp

(8), condenser (9), and two ground leads (10

and 11), from harness (2) and fuel tank (5).

Remove two screws (12), flat washers (13),

key washers (14), and bracket (15) from hull

at front end of fuel tank (5). Discard key

washers.

Remove cotter pin (16), headed pin (17),

washer (18), and restraint plate (19) from

bracket (15). Discard cotter pin.

10.

11.

12.

13.

14.

15.

Remove two screws (20), five lockwashers

(21), fuel tank guard (22), and ground lead

(23) from fuel tank (5). Discard

lockwashers.

Disconnect fuel supply

adapter (25).

Disconnect fuel return

adapter (27).

Disconnect heater fuel

fuel shutoff valve (29)

er is installed).

hose (24) from

hose (26) from

supply hose (28) from

(when personnel heatRemove litter kit mount pin (30) and

lockwasher (31) from hull top. Discard

lockwasher.

Remove thumbscrew (32) and wing nut (33)

from hull top.

6-12
TM 9-2350-261-20-1 

16. Remove two locknuts (1), springs (2), and

four washers (3) from four bands (4).

Discard locknuts.

17. Remove shield (5) from inboard side of fuel

tank (6).

18. Remove retainer (7) from top side of fuel

tank (6).

19. Position harness (8) to clear top of fuel tank

(6). Remove fuel tank from carrier.

20. Remove four screws (9), key washers (10),

two brackets (11), and bands (4). Discard

key washers.

21. Remove four screws (9), key washers (10),

two brackets (11), four spacers (12), and

two bands (4). Discard key washers.

GO TO NEXT PAGE

6-13
TM 9-2350-261-20-1

DISASSEMBLE

22. Remove adapter

valve (2).

(1) from fuel shutoff

23. Remove

24. Remove

25. Remove

26. Remove

shutoff valve (2) from elbow (3).

elbow (3) from adapter (4).

adapter (5) from elbow (6).

elbow (6) from fuel tank (7).

NOTE

If heater is installed, go to step 28.

27.

28.

29.

30.

31.

Remove pipe plug (8) and elbow (11) from

fuel tank (7) (without personnel heater

installed).

Remove adapter (9), shutoff valve (10), and

elbow (11) from fuel tank (7) (with

personnel heater installed).

Remove fuel drain valve (12) from nipple

(13). Remove drain plug (14) from drain

valve (12).

Remove nipple (13) from fuel tank (7).

Remove adapter (4), adapter (15), and tube

(16) from fuel tank (7). 

6-14
TM 9-2350-261-20-1 

CLEAN, INSPECT, AND REPAIR

32.

33.

34.

35.

Clean hull, retainer, shield, and pad surface

thoroughly so that metal and rubber

surfaces are clean and dry.

Check fittings. Repair or replace parts that

have stripped threads.

Check pads on bottom of tank retainer and

on hull, and rubber strips on both sides of

shield. Replace missing, cut, broken, or

cracked pads and rubber strips

(page 25-243).

Check decals. Replace decals that cannot be

read (page 25-226).

ASSEMBLE

36. Apply a thin even coat of sealing compound

to cleaned external threads of fittings before

installation.

37. Install adapter (1) in fuel tank (2).

38. Install tube (3) through adapter (1) and

guide tube into tank baffle from fuel filler

opening.

39. Install

40. Install

41. Install

Install

adapter (4) on adapter (1).

nipple (5) in fuel tank (2).

fuel drain valve (6) on nipple (5).

drain plug (7) in drain valve (6).

NOTE

If personnel heater is installed, go to

step 43.

42. Install elbow (8), shutoff valve (9), and

adapter (10) in fuel tank (2) (when

personnel heater is installed).

GO TO NEXT PAGE

6-15
TM 9-2350-261-20-1 

43.

44.

45.

Install pipe plug (1) and eIbow (2) in fuel

tank (3) (without personnel heater installed).

Install elbow (4) in fuel tank (3).

Install adapter (5) in elbow (4).

46. Install elbow (6) in adapter (7).

47. Install fuel shutoff valve (8) on elbow (6).

48. Install adapter (9) in fuel shutoff valve (8).

6-16
INSTALL

.

49.

50.

51.

Secure bands (1) with two decals (2) to hull

with two brackets (3), four new key washers

(4), and screws (5). Tighten screws to

40-45 lb-ft (54-61 N•m) torque. Use torque

wrench (Item 97).

Secure bands (6) to hull with four spacers

(7), two anchor straps (8), four new key

washers (9), and screws (10). Tighten

screws to 168-204 Ib-in (19-23 N•m)

torque. Use torque wrench (Item 95) and

rocket wrench set.

Position wiring harness (11) to clear fuel

tank installation area (12). Install fuel tank

in carrier.

52.

53.

54.

55.

56.

TM 9-2350-261-20-1

Install thumbscrew (13) and wingnut (14) in

hull top.

Install litter kit mount pin (15) and new

lockwasher (16) in hull top.

Connect fuel supply hose (17) to

adapter (18).

Connect fuel return hose (19) to

adapter (20).

Connect heater fuel supply hose (21) to

shutoff valve (22) (when personnel heater is

installed).

GO TO NEXT PAGE

6-17
57. Place retainer (1) on top side of fuel

tank (2).

58. Place shield (3) on inboard side of fuel

tank (2).

59.

60.

Secure fuel tank (2) to hull with four straps

(4), two springs (5), nuts (6), and four

washers (7). Adjust strap springs as shown

on decal (8).

Install fuel line guard (9) and ground lead

(10) on fuel tank (2). Secure with two

screws (11) and five new lockwashers (12).

6-18

TM 9-2350-261-20-1
TM 9-2350-261-20-1 

61.

62.

63.

64.

Secure bracket (1) to hull with two screws

(2), new key washers (3), and flat washers

(4). Tighten screws to 40-45 lb-ft

(54-61 N•m) torque. Use torque wrench

(Item 97).

Install restraint plate (5) on bracket (1).

Secure with headed pin (6), new cotter pin

(7), and washer (8).

Install two ground leads (9 and 10), condenser (11), and wiring harness (12) on fuel

tank (13). Secure with clamp (14), two

washers (15), and screw (16).

Install wiring harness (12) on front end of

fuel tank (13). Secure with two clips (17),

cradles (18), and screws (19).

65.

66.

67.

68.

69.

Install wiring harness (12) on wiring harness cover (20). Secure with three clamps

(21), screws (22), and new locknuts (23).

Install wiring harness (12) on wiring harness guard (24). Secure with two clamps

(25), screws (26), and nuts (27).

Install guard (24) and ground lead (28) on

hull. Secure with two screws (29) and three

new lockwashers (30).

Install access cover (31) on cover (20).

Secure with two screws (32), new

lockwashers (33), and nuts (34).

Install cover (20) on fuel tank (13). Secure

with two screws (35) and new

lockwashers (36).

GO TO NEXT PAGE

6-19
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS 

1. Install fuel quantity transmitter 

2. Install fuel neck and boot (page

3. Fill fuel tank (see your –10).

(page 6-9). 4.

6-8). 5.

6.

Connect battery ground lead (page 13-2).

Raise and lock ramp (see your –10).

Stop/shutdown engine (see your –10).

END OF TASK

6-20 
TM 9-2350-261-20-1 

TEMPORARY FUEL TANK REPAIR (M113A2, M1059, M901A1 

M1068, AND M577AZ ONLY) 

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 49, App C)

Dry cleaning solvent (Item 13, App C)

Sealing tape (Item 56, App C)

Personnel Required: 

Unit Mechanic

References:

See your -10

Equipment Conditions: 

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel tank removed (optional, page 6-11) or

fuel drained below area of repair (page 6-5)

REPAIR

1.

NOTE

This task is for fuel tank temporary

repair only. Repair is not feasible in

temperatures below +40°F (+4°C). Best

results are obtained if temperature is

between 75° and 90°F (24° and 32°C).

CAUTION

Be sure fuel level in tank is below area to

be repaired.

Clean 3 to 4 inches (8 to 10 cm) around

repair area. Use a wire brush, steel wool, or

emery cloth.

WARNING

D ry cleaning solvent

P-D-680 is toxic and

flammable. Always use in

an open area with good air

flow, away from sparks,

heat, or flames. Wear

goggles and gloves. Do not breath vapors.

Avoid contact with skin, eyes, and clothes.

If you get dizzy while using solvent,

breath fresh air and get medical help. If

solvent gets on hands, wash them. If

solvent gets in eyes, flush eyes with fresh

water and get medical help immediately.

Keep fire extinguisher nearby.

Clean area with dry cleaning solvent. Dry

area with a clean cloth.

3. Reinforce small repair area with clean cloth

or sealing tape.

4. Reinforce large repair area with sheet metal

(aluminum), cut to fit.

NOTE

Sealing compound is usable for two hours

after mixing. Use mixed sealing compound within this time.

5. Apply mixed sealing compound 3/16-1/4 inch

(4-6 mm) thick over repair area.

6. Apply 1/16 inch (2mm) minimum of sealing

. compound over reinforcement. Sealing compound must extend at least two inches (5

cm) beyond reinforcement on all sides.

7. Allow sealing compound to cure before filling

fuel tank. Sealing compound will be tack-free

in 40 hours and cured in 72 hours.

GO TO NEXT PAGE

Change 3 6-21

 2
TM 9-2350-261-20-1 

FOLLOW-THROUGH STEPS 

1. Install fuel tank (page 6-11, optional).

2. Fill fuel tank (see your -10).

leaks.

Check tank for

3. Connect battery ground lead (page 13-2).

4. Raise and lock ramp (see your -10).

5. Stop/shutdown engine (see your -10).

END OF TASK

6-22 
TM 9-2350-261-20-1 

REPLACE FUEL TANK-TO-BULKHEAD HOSES, TUBES, AND 

FITTINGS (M113A2, M901A1, AND M1059 ONLY) 

DESCRIPTION

This task covers: Remove (page 6-23). Install (page 6-25).

.

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Lockwasher (5)

Strap (5)

Personnel Required: 

Unit Mechanic

References:

see your -10

Equipment Conditions: 

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Disconnect battery ground lead (page 13-2)

Rear compartment floor plates removed

(page 24-37, 24-42, or 24-45)

Power plant rear access panel removed

(page 24-27)

REMOVE

WARNING

1.

2.

3.

4.

5.

6.

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Tag hoses and quick disconnects before

removing.

Use wiping rag to wipe up any spilled fuel.

Drain fuel tank (page 6-5).

Separate two quick-disconnect couplings (1)

inside power plant rear bulkhead.

Disconnect fuel supply hose (2) and fuel return hose (3) from two bulkhead elbows (4).

Remove two quick-disconnect coupling halves

(5) from two elbows (6).

Remove two elbows (6) from two tube

assemblies (7).

Remove two tube assemblies (7) from two

bulkhead elbows (4).

7. Remove two nuts (8) and bulkhead elbows

(4) from power plant rear bulkhead.

8. Remove five screws (9), washers (10), and

two guards (11) from hull.

GO TO NEXT PAGE

6-23
TM 9-2350-261-20-1 

9.

10.

11.

12.

13.

14.

Remove five straps (1) from fuel

hoses (2 and 3).

Remove four screws (4), eight clamps (5),

and fuel hoses (2 and 3) from four weldnuts (6).

Remove two screws (7), five lockwashers (8),

guard (9), and ground lead (10) from fuel

tank (11). Discard lockwashers.

Disconnect fuel supply hose (12) from

adapter (13).

Remove adapter (13) from fuel shutoff

valve (14).

Remove fuel shutoff valve (14) from

elbow (15).

15.

16.

17.

18.

19.

20.

21.

22.

23.

Remove elbow (15) from adapter (16).

Remove adapter (16) from fuel tank (11).

Disconnect fuel return hose (17) from

elbow (18).

Remove elbow (18) from fuel tank (11).

Remove drain cock (19) from nipple (20).

Remove nipple (20) from fuel tank (11).

Remove two screws (21), and washers (22),

and guard (23).

Remove

Remove

plug (24) from elbow (25).

elbow (25) from fuel tank (11).

6-24 
TM 9-2350-261-20-1

24.

25.

26.

27.

28.

29.

30.

Apply a thin, even coat of sealing compound

to cleaned external threads of fittings.

Install nipple (1) in fuel tank (2).

Install drain cock (3) on nipple (1).

Install elbows (4 and 5) in fuel tank (2).

Install plug (6) in elbow (5).

Connect fuel return hose (7) to elbow (4).

Install adapter (8) in fuel tank (2).

31.

32.

33.

34.

35.

36.

Install

Install

elbow (9) on adapter (8).

fuel shutoff valve (10) on elbow (9)

with arrow pointing in down direction.

Install adapter (11) in fuel shutoff

valve (10).

Connect fuel supply hose (12) to

adapter (11).

Install guard

fuel tank (2).

and five new

Install guard

(13) and ground lead (14) on

Secure with two screws (15)

lockwashers (16).

(17) . Secure with two screws

GO TO NEXT PAGE

6-25

INSTALL 

(18) and washers (19). 
37.

38.

39.

40.

41.

Secure two bulkhead elbows (1) to power

plant rear bulkhead with two nuts (2).

Connect two tube assemblies (3) to two

elbows (1).

Connect two elbows (4) to two tubes (3).

Install two quick-disconnect coupling halves

(5) on two elbows (4).

Connect fuel supply hose (6) and fuel return

42.

43.

44.

45.

Secure two fuel hoses (6 and 7) together

with five straps (8).

Install two hoses (6 and 7) on four weldnuts

(9). Secure with four screws (10) and eight

clamps (11).

Secure two guards (12) to hull with five

screws (13) and washers (14).

Connect two quick-disconnect couplings (15)

inside power plant rear bulkhead.

Fill fuel tank (see your -10).

hose (7) to two elbows (1).

46.

FOLLOW-THROUGH STEPS 

1. Connect battery ground lead (page 13-2). 4. Install rear compartment floor plates

(page 24-37, 24-42, or 24-45).

2. Start engine (see your -10). Check for leaks.

5. Raise and lock ramp (see your -10).

3. Install power plant rear access panel

(page 24-27). 6. Stop/shutdown engine (see your -10).

END OF TASK

6-26

TM 9-2350-261-20-1
Section III.

TM 9-2350-261-20-1 

EXTERNAL FUEL TANKS, TUBES, HOSES AND 

FITTINGS (M981 AND M1064 ONLY) 

TASK INDEX 

Task Page

Drain Fuel Tanks (M981 and M1064

Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-28

Replace Combat Filler Cover and

Lock (M981 and M1064 Only) . . . . . . . ...6-29

Replace Filler Cap and Strainer

Parts (M981 and M1064 Only) . . . . . . ...6-30

Replace Fuel Tank Access Covers

and Drain Plugs (M981 and M1064

Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-31

Replace Fuel Quantity Transmitter

(M981 and M1064 Only) . . . . . . . . . . . . . ...6-32

Task Page

Replace Fuel Supply Hoses, Tubes,

and Fittings (M981 Only) . . . . . . . . . . . . . . .6-39

Replace Fuel Return Hoses, Tubes,

and Fittings (M981 Only) . . . . . . . . . . . . . . .6-44

Clean Fuel Cap Vent and Filter

Screen (M981 and M1064 Only) . ...6-48.1

Replace Fuel Supply Hoses, Tubes,

and Fittings (M1064 Only) . . . . . . . . . . . 6-48.3

Replace Fuel Return Hoses, Tubes,

and Fittings (M1064 Only) . . . . . . . . . . . 6-48.9

Change 2 6-27

6-34
TM 9-2350-261-20-1 

DRAIN FUEL TANKS (M981 AND M1064 ONLY) 

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions: 

Wiping rag (Item 61, App C) Engine stopped/shutdown (see your -10)

Suitable container (2) Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Personnel Required: 

Unit Mechanic

DRAIN 6. Install plug (4) in fuel tank (3) after the

tank has been drained.

1. Open fuel filler combat cover (1). Remove fuel

filler cap (see your -10). 7. Install fuel filler cap (see your -10). Close

filler combat cover (1).

NOTE

Fuel tank capacity is 47.5 gal.

2. Place suitable container (2) directly beneath

fuel tank (3).

WARNING

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Use wiping rag to wipe up any spilled fuel.

3. Ground container (2) to carrier.

4. Close both fuel tank shut off valves

(see your –10).

5. Remove plug (4) from fuel tank (3). Drain

fuel.

FOLLOW-THROUGH STEPS 

1. Connect battery ground leads (page 13-2). 2. After maintenance has been performed, fill

fuel tanks (see your -10).

END OF TASK

6-28 Change 2
TM 9-2350-261-20-1

REPLACE COMBAT FILLER COVER AND LOCK 

(M981 AND M1064 ONLY) 

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions: 

Spring pin Engine stopped/shutdown (see your -10)

Spring pin Ramp lowered (see your -10)

Carrier blocked (see your -10)

Personnel Required: 

Unit Mechanic

REMOVE INSTALL

1.

2.

3.

Loosen wing nut (1). Remove thumbscrew (2) 4.

and wing nut from inside carrier.

Remove spring pin (3), washer (4), spring (5), 5.

and pin (6) from top of hull. Discard spring

pin.

Remove spring pin (7) and cover (8) from 6.

fuel tank. Discard pins.

Secure cover (8) to fuel tank with new spring

pin (7).

Install pin (6) on top of hull. Secure with

spring (5), washer (4), and new spring

pin (3).

Install wing nut (1) and thumbscrew (2) from

inside carrier. Tighten wing nut.

FOLLOW-THROUGH STEPS 

1. Raise and lock ramp (see your -10). 2. Stop/shutdown engine (see your –10).

END OF TASK

Change 2 6-29
TM 9-2350-261-20-1 

REPLACE FILLER CAP AND STRAINER PARTS 

(M981 AND M1064 ONLY)

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions: 

Non-electrical wire (Item 31, App C) Engine stopped/shutdown (see your -10)

Gasket Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Personnel Required: Combat filler cover open (see your -10)

Unit Mechanic

1.

2.

3.

4.

Unfasten fuel filler cap and chain assembly

(1) from filler neck (2).

Remove lockwire (3), 12 screws (4), filler neck

(2), strainer (5), and filler cap and chain assembly (1) from hull top. Discard lockwire.

Pull filler cap and chain assembly ( 1 ) through

opening in filler neck (2).

Remove gasket (6). Discard gasket.

5.

6.

7.

8.

9.

Install new gasket (6).

Install filler cap and chain assembly (1)

through filler neck (2).

Secure filler neck (2), strainer (5), and filler

cap and chain assembly (1) to hull top with

12 screws (4).

Install new lockwire (3) thru heads of 12

screws (4).

Fasten filler cap and chain assembly (1) in

filler neck (2).

FOLLOW-THROUGH STEPS 

1. Connect battery ground leads (page 13-2). 2. Combat filler cover closed and locked

(see your -10).

END OF TASK

6-30 Change 2

REMOV E

INSTALL 
TM 9-2350-261-20-1 

REPLACE FUEL TANK ACCESS COVERS AND DRAIN PLUGS 

(M981 AND M1064 ONLY) 

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Torque Wrench (Item 96, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Gasket

Lockwasher (8)

Lockwasher (2)

Personnel Required: 

Unit Mechanic

References:

See your -10

Equipment Conditions: 

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Fuel tanks drained (page 6-28)

REMOVE

1.

2.

3.

NOTE

Right and left fuel tank access covers are

the same. The following steps apply to one

cover.

Remove two screws (1), lockwashers (2), flat

washers (3), and bracket (4) from cover (5).

Discard lockwashers.

Remove eight screws (6), lockwashers (7), flat

washers (8), cover (5), and gasket (9) from

fuel tank (10). Discard gasket and

lockwashers.

Remove drain plug (11) and bushing ( 12)

from fuel tank ( 10).

INSTALL

4. Install cover (5) and new gasket (9) on fuel

tank (10). Secure with eight screws (6), new

lockwashers (7), and flat washers (8).

Tighten screws to 45-50 lb-ft (61-88 N•m)

torque. Use torque wrench.

5. Install bracket (4) on cover (5). Secure with

two screws (1), new lockwashers (2), and flat

washers (3).

6. Apply a coat of sealing compound to cleaned

threads of bushing (

7. Install bushing (12)

8. Install drain plug (1

12) and drain plug (11).

in fuel tank (10).

1 ) in bushing (12).

FOLLOW-THROUGH STEPS 

1. Fill fuel tanks (see your -10). 2. Check for fuel leaks.

END OF TASK

Change 2 6-31
TM 9-2350-261-20-1

REPLACE FUEL QUANTITY TRANSMITTER 

(M981 AND M1064 ONLY) 

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions: 

Sealing compound (Item 46, App C) Engine stopped/shutdown (see your –10)

Lock washer (2) Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Personnel Required: Fuel tanks drained (page 6-30)

Unit Mechanic Fuel tank access covers removed (page 6-33)

Tail lights and guards removed (page 12-57)

REMOVE 3.

1.

2.

NOTE

Right and left fuel quantity transmitters 4.

are the same. The following steps apply to

one unit.

5.

Disconnect lead (1) from transmitter (2). (Circuit 30A is left tank transmitter. Circuit

is right tank transmitter).

Remove two screws (3), lockwashers (4),

washers (5), bracket (6), and transmitter

from fuel tank (7). Discard lock washers.

31A

6.

(2) 7.

Remove screw (8), washer (9), and clamp

(10) that secures lead (1) to fuel tank (7).

Remove shell (11) and washer (12) from lead(1).

Remove nut (14) and bushing (15) from connector (16).

Remove connector (16) and lead (1) from fuel

tank (7).

Remove five screws (17) and nuts (18). Separate transmitter (2) from bracket (6).

6-32 Change 2
8. Apply a thin coat of sealing compound to cleaned external threads of connector (1) before

installation. 13.

9. Secure transmitter (2) to bracket (3) with

five screws (4) and nuts (5). 14.

10. Install bracket (3) and transmitter (2) on

fuel tank (6). Secure with two screws (7), 15.

new lockwashers (8), and washers (9).

11. Install lead (10) and connector (1) in

tank (6).

TM 9-2350-261-20-1

Connect lead (10) to transmitter (2). (Circuit

30A is left tank transmitter. Circuit 31A is

right tank transmitter).

Secure lead (10) to tank (6) with clamp

(11), washer (12), and screw (13).

Install bushing (14) and nut (15) on

connector (1).

Install shell (16) and washer (17) from lead(10).

FOLLOW-THROUGH STEPS 

1. Install fuel tank access covers (page 6-33). 4. Check that fuel level transmitter works

properly (see your –10).

2. Fill fuel tanks (see your –10).

5. Install tail lights and guards (page 12-57).

3. Connect battery ground lead (page 13-2).

END OF TASK

Change 2 6-33

12.

INSTAL L
TM 9-2350-261-20-1

REPLACE FUEL TANKS (M981 AND M1064 ONLY) 

DESCRIPTION

This task covers: Remove (page 6-34). Install (page 6-36).

INITIAL SETUP 

Tools

General Mechanics Tool kit (Item 30, App D)

Angle Lifting Bracket (Item 15, App D)

Socket Wrench Set (Item 90, App D)

Torque Wrench (Item 98, App D)

Suitable Lifting Device

Materials/Parts:

Caulking compound (Item 8, App C)

Molybdenum D grease (Item 30, App C)

Sealing compound Primer (Item 43, App C)

Sealing compound (Item 46, App C)

Sealing compound (Item 50, App C)

Sealing compound (Item 52, App C)

Wiping rag (Item 61, App C)

Gasket

Lockwasher (5)

Set screw (4)

Personnel Required: 

Unit Mechanic

Personnel Required: (cont): 

Helper (H)

References:

See your -10

Equipment Conditions: 

Engine shutdown (see your –10)

Carrier blocked (see your –10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2).

Fuel tanks drained (page 6-28)

Filler covers and locks removed (page 6-29)

Filler caps and strainers removed (page 6-30)

Fuel tank access covers removed (page 6-31)

Fuel quantity transmitter removed

(page 6-32)

Cable reel holder assembly removed

(page 41-7)

Tail lights and guards removed (page 12-57)

Track shrouds removed (page 22-2)

REMOVE

1.

WARNING

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Pipes are removed from both fuel tanks

the same way. Use wiping rag to wipe up

any spilled fuel.

Unscrew pipe (1) from fuel tank (2).

6-34 Change 2
2.

3.

4.

5.

6.

Fuel hoses are

tanks the same

shown).

NOTE

removed from both fuel

way (right side fuel tank

Do steps 2 thru 6 for M981 only.

Disconnect fuel supply hose (1) and fuel

return hose (2) from adapters (3 and 4).

Remove adapters (3 and 4) from

valves (5 and 6).

Remove valves (5 and 6) from

unions (7 and 8).

Remove unions (7 and 8) from

nipples (9 and 10).

Remove nipples (9 and 10) from fuel tank

TM 9-2350-261-20-1 

NOTE

Do steps 6.1 thru 6.6 on M1064 only.

6.1

6.2

6.3

6.4

6.5

6.6

Disconnect fuel supply hose (12) and fuel

return hose (13 ) from adapters

(14 and 15).

Remove adapters (14 and 15) from

valves (16 and 17).

Remove valves (16 and 17) from

adapters (18 and 19).

Remove adapters (18 and 19) from

elbows (20 and 21).

Remove elbows (20 and 21) from adapters

(22 and 23).

Remove adapters (22 and 23) from fuel

tank (24).

GO TO NEXT PAGE

Change 2 6-35

(11).
TM 9-2350-261-20-1 

NOTE

Both fuel tanks are removed from carrier

the same way (left side fuel tank shown).

Use tail light bracket screws to secure

lifting bracket to fuel tank.

7. Install angle lifting bracket (1) on tail light

9. Remove five screws (5), washers (6), and

gasket (7), from fuel tank (8). Discard

gasket. Remove fuel tank from carrier.

Have helper assist.

bracket mounting holes (2). Secure

screws (3). Attach lifting device to

bracket.

with two

lifting

NOTE

Both fuel tanks are installed on carrier

the same way (left side fuel tank shown).

8. Remove fuel cap locking thumbscrew (4)

from inside earner.

10.

11.

Apply thin coat of sealing compound

(Item 52) to new gasket (7) and to gasket

mating surface on fuel tank (8). When

sealing compound has become tacky,

install gasket on tank.

Attach lifting device to lifting bracket (9).

Position fuel tank (8) to rear hull plate

(10). Have helper assist.

NOTE

Inside of mounting holes and full diameter area under each washer must be free

of paint to ensure a good electrical

ground.

12.

13.

14.

Apply molybdenum D grease to threads of

five screws (5).

Secure fuel tank (8) to rear hull plate (10)

with five screws (5) and washers (6).

Tighten screws to 270-295 lb-ft

(366-400 N•m) torque. Use torque wrench

and socket wrench set. Have helper assist.

Apply caulking compound to space around

installed screw heads and washers on rear

hull plate (10). Do not apply compound to

screw threads.

6-36 Change 2
TM 9-2350-261-20-1

15. Install fuel cap locking thumbscrew (1) in

carrier bulkhead.

NOTE

Save lifting bracket screws for

installation of tail light bracket.

16. Remove two screws (2) and angle lifting

bracket (3) from fuel tank (4).

NOTE

Two pipes are installed in both fuel tanks

the same way.

17. Apply primer to threads of pipe (5). coat

threads with sealing compound (Item 46).

18. Install pipe (5) in fuel tank (4).

NOTE

Fuel hoses are installed

tanks the same way (right

shown).

on both fuel

side fuel tank

Do steps 19 thru 26 on M981 only.

19.

20.

21.

22.

23.

24.

25.

26.

Apply sealing compound (Item 50) to pipe

threads on nipples (6 and 7) and unions

(8 and 9).

Install nipples (6 and 7) in fuel tank (4).

Install unions (8 and 9) on

nipples (6 and 7).

Install fuel

with arrow

Install fuel

with arrow

supply valve (10) on union (8)

pointing toward the engine.

return valve (11) on union (9)

pointing toward fuel tank.

Install adapters (12 and 13) in

valves (10 and 11).

Connect fuel supply hose (14) to

adapter (12).

Connect fuel return hose (15) to

adapter (13).

GO TO NEXT PAGE

Change 2 6-37
TM 9-2350-261-20-1

NOTE

Do steps 26.1 thru 26.9 on M1064 only.

26.1

26.2

26.3

26.4

26.5

26.6

Apply sealing compound (Item 50) to pipe

threads on adapters (1 and 2) and

elbows (3 and 4).

Install adapters (1 and 2) in fuel

tank (5).

Install elbows (3 and 4) on

adapters (1 and 2).

Install adapters (6 and 7) on

elbows (3 and 4).

Install fuel return valve (8) on adapter (6)

with arrow pointing toward fuel tank.

Install fuel supply valve (9) on adapter (7)

with arrow pointing toward the engine.

26.7 Install adapters (10 and 11) in

valves (8 and 9).

26.8 Connect fuel return hose (12) to

adapter ( 10).

26.9 Connect fuel supply hose (13) to

adapter (11).

NOTE

The four spare electrical mounting holes

will always be the holes located on the

outer edge of each fuel tank. The

electrical guards are always mounted on

the inner edge of each fuel tank.

27. Install four setscrews (14) in spare holes

provided for electrical mounting.

FOLLOW-THROUGH STEPS 

1. Install filler caps and strainers (page 6-30). 7. Cable reel holder assembly installed

(page 41-7).

2. Install filler covers and locks (page 6-29).

8. Fill fuel tanks (see your –10).

3. Install fuel quantity transmitter

(page 6-32). 9. Start engine (see your –10). Check for

leaks.

4. Install fuel tank access covers (page 6-31).

5. Install guards and tail lights (page 12-57).

6. Connect battery ground lead (page 13-2).

10. Raise and lock ramp (see your –10).

11. Install track shrouds (page 22-2).

END OF TASK

6-38 Change 2
TM 9-2350-261-20-1

REPLACE FUEL SUPPLY HOSES, TUBES, AND FITTINGS 

(M981 ONLY) 

DESCRIPTION

This task covers: Remove (page 6-39). Install (page 6-41).

INITIAL SETUP 

Tools

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Lockwasher (6)

lockwasher (4)

Strap (4)

Personnel Required 

Unit Mechanic

References

See your -10

TM 9-2350-266-20

Equipment Conditions 

Engine stopped/shutdown (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel tanks drained (page 6-28)

Cargo area floor plates removed

(See TM 9-2350-266-20)

Power plant rear access panel removed

(page 24-27)

REMOVE

1.

2.

3.

4.

5.

WARNING

Fuel flowing over a metal

. surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Tag hoses before removal.

Use wiping rags to wipe any spilled fuel.

Disconnect quick disconnect

quick disconnect half (2) at

bulkhead.

Disconnect fuel supply hose

eIbow (4).

half (1) from

power plant rear

(3) from buldkhead

Remove quick disconnect half (2) from

elbow (5).

Disconnect tube assembly (6) from

elbows (4 and 5).

Remove nut (7) and bulkhead elbow (4) from

power plant rear bulkhead.

GO TO NEXT PAGE

6-39
TM 9-2350-261-20-1

6.

7.

8.

9.

10.

Remove five screws (1), lockwashers (2), and

two guards (3) from hull. Discard

lockwashers.

Remove three straps (4) that secure supply

hoses (5 and 6) and return hose (7) together. Discard straps.

Remove three screws (8), Iockwashers (9),

six clamps (10), and supply hose (11) from

three weldnuts (12). Discard Iockwashers.

Disconnect supply hose (5) from elbow (13)

(or tee (14) if personnel heater is installed).

Remove strap (15) that secures personnel

heater fuel hose (16) to supply hose (11) (if

personnel heater is installed). Discard strap.

11.

12.

13.

14.

15.

16.

Remove two screws (17), washer (18), and

guard (19) from hull.

Remove personnel heater tube (if personnel

heater is installed) (page 29-26).

Remove screw (20), lockwasher (21), clamp

(22), and tube assembly (23) from weldnut

(24). Discard lockwasher.

Remove elbow (13) from tube (23).

Disconnect tube (23) and two supply hoses

(6 and 11) from three adapters (25).

Remove three adapters (25) from check

valve (26).

6-40
TM 9-2350-261-20-1 

17.

18.

19.

20.

21.

22.

23.

24.

25.

26.

27.

Disconnect supply hose (1) from adapter (2).

Remove adapter (2) from supply shutoff

valve (3).

Remove supply shutoff valve (3) from

union (4).

Remove union (4) from nipple (5).

Remove nipple (5) from right fuel tank.

Remove screw (6), lockwasher (7), clamp (8),

and supply hose (9) from weldnut (10).

Discard lockwasher.

Disconnect supply hose (9) from

adapter (11).

Remove adapter (11) from supply shutoff

valve (12).

Remove supply shutoff valve (12) from

union (13).

Remove union (13) from nipple (14).

Remove nipple (14) from left fuel tank.

INSTALL

28. Apply a thin even coat of sealing compound

to cleaned external threads of fittings before

installation.

29.

30.

31.

32.

33.

34.

35.

36.

37.

38.

39.

Install

Install

Install

nipple (14) in left fuel tank.

union (13) on nipple (14).

supply shutoff valve (12) on union

(13) with arrow pointing away from fuel

tank.

Install adapter (11) in supply shutoff

valve (12).

Connect supply hose (9) to adapter (11).

Secure supply hose (9) to weldnut (10) with

clamp (8), new lockwashers (7), and

screw (6).

Install

Install

Install

nipple (5) in right fuel tank.

union (4) on nipple (5).

supply shutoff valve (3) on union (4)

with arrow pointing away from fuel tank.

Install adapter (2) in supply shutoff

valve (3).

Connect supply hose (1) to adapter (2).

GO TO NEXT PAGE

6-41
40.

41.

42.

43.

44.

Install three adapters (1) in check valve (2).

Connect tube assembly (3) and two supply

hoses (4 and 5) to three adapters (1).

Connect elbow (6) (or tee (7) if personnel

heater is installed) to tube (3).

Secure tube (3) to weldnut (8) with clamp

(9), new lockwasher (10), and screw (11).

Install supply hose (5) and Six clamps (12)

on three weldnuts (13). Secure with three

screws (14) and new lockwashers (15).

45.

46.

47.

48.

49.

Install heater tube (if personnel heater is

installed) (page 29-26).

Secure guard (16) to hull

(17) and washer (18).

Secure supply hose (5) to

(19) with new strap (20)

er is installed).

Connect supply hose (21)

with two screws

heater fuel hose

(if personnel heatto elbow (6) (or

tee (7) if personnel heater is installed).

Secure supply hoses (21 and 4) and return

hose (22) together with three new

straps (23).

6-42

TM 9-2350-261-20-1
TM 9-2350-261-20-1

50.

51.

52.

53.

Install two guards (1) on hull. Secure with 54.

five screws (2) and new lockwashers (3).

Secure bulkhead elbow (4) to power plant 55.

rear bulkhead with nut (5).

Connect tube assembly (6) to bulkhead 56.

elbow (4).

Connect elbow (7) to tube assembly (6).

Connect quick disconnect half (8) to

elbow (7).

Connect supply hose (9) to bulkhead

elbow (4).

Connect quick disconnect half (10) to quick

disconnect half (8) at power plant rear

bulkhead.

FOLLOW-THROUGH STEPS 

1. Fill fuel tanks (see your -10). 5. Install power plant rear access panel

(page 24-27).

2. Connect battery ground leads (page 13-2).

6. Raise and lock ramp (see your -10).

3. Start engine (see your -10). Check for leaks.

7. Stop/shutdown engine (see your -10).

4. Install cargo area floor plates

(see TM 9-2350-266-20).

END OF TASK

6-43
TM 9-2350-261-20-1

REPLACE FUEL RETURN HOSES, TUBES, AND FITTINGS 

(M981 ONLY) 

DESCRIPTION

This task covers: Remove (page 6-44). Install (page 6-46).

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing Compound (Item 46, App C)

Wiping rag (Item 61, App C)

Lockwasher (5)

Lockwasher (4)

Lockwasher

Strap (3)

Personnel Required: 

Unit Mechanic

References:

See your -10

TM 9-2350-266-20

Equipment Conditions: 

Engine stopped/shutdown (see your-10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel tanks drained (page 6-28)

Cargo area floor plates removed

see TM 9-2350-266-20)

Power plant rear access panel removed

(page 24-27)

Carrier blocked (see your -10)

1.

2.

I

3.

WARNING

Fuel flowing over a metal 4.

surface causes static

electricity. This will cause a

spark unless the surface is 5.

grounded.

NOTE

Use wiping rag to wipe up any spilled fuel.

Remove quick disconnect half (2) from

elbow (5).

Disconnect tube assembly (6) from

elbows (4 and 5).

Remove nut (7) and bulkhead elbow (4) from

power plant rear bulkhead.

Disconnect quick disconnect half (1) from

quick disconnect half (2) at power plant rear

bulkhead.

Disconnect fuel return hose (3) from bulkhead

elbow (4).

6-44

REMOVE 
6.

7.

8.

9.

10.

Remove five screws (1), lockwashers (2), and

two guards (3) from hull. Discard

lockwashers.

Remove three straps (4) that secure return

hose (5) and supply hoses (6 and 7)

together. Discard straps.

Remove two screws (8), lockwasher (9), and

guard (10) from hull. Discard lockwasher.

Remove three screws (11), lockwashers (12),

six clamps (13), and return hose (5) from

three weldnuts (14). Discard lockwashers.

Disconnect return hoses (15, 5, and 16)

from tee (17).

11.

12.

13.

14.

15.

16.

TM 9-2350-261-20-1 

Disconnect return hose (16) from

adapter (18).

Remove adapter (18) from return shutoff

valve (19).

Remove return shutoff valve (19) from

union (20).

Remove union (20) from nipple (21).

Remove nipple (21) from right fuel tank.

Remove screw (22), lockwasher (23), clamp

(24), and return hose (5) from weldnut (25).

Discard lockwasher.

GO TO NEXT PAGE

6-45
TM 9-2350-261-20-1 

17. Disconnect return hose (1) from adapter (2).

18. Remove

19. Remove

20. Remove

21. Remove

INSTALL

22.

23.

24.

25.

adapter (2) from shutoff valve (3).

shutoff valve (3) from union (4).

union (4) from nipple (5).

nipple (5) from left fuel tank.

Apply a thin even coat of sealing compound

to cleaned external threads of fittings before

installation.

Install nipple (5) in left fuel tank.

Install union (4) on nipple (5).

Install shutoff valve (3) on union (4) with

arrow pointing toward tank.

26.

27.

28.

29.

30.

31.

32.

33.

34.

Install adapter

connect return

(2) in shutoff valve

hose (1) to adapter

(3).

(2).

Install return hose (1) on weldnut (6). Secure with screw (7), new lockwasher (8),

and clamp (9).

Install nipple (10) in right fuel tank.

Install union (11) on nipple (10).

Install shutoff valve (12) on union (11) with

arrow pointing toward tank.

Install adapter

Connect return

Connect return

tee (16).

(13) in shutoff valve (12).

hose (14) to adapter (13).

hoses (15, 1, and 14) to

6-46
TM 9-2350-261-20-1 

35.

36.

37.

38.

Install return hose (1) and six clamps (2) On

three weldnuts (3). Secure with three screws

(4) and new lockwashers (5).

Secure guard (6) to hull with two screws (7)

and new lockwasher (8).

Secure return hose (1) and supply hoses

(9 and 10) together with three new

straps (11).

Secure two guards (12) to hull with five

screws (13) and new lockwashers (14).

39.

40.

41.

42.

43.

44.

Secure bulkhead elbow (15) to power plant

rear bulkhead with nut (16).

Connect tube assembly (17) to bulkhead

elbow (15).

Connect elbow (18) to tube (17).

Connect quick disconnect half (19) to

elbow (18).

Connect return hose (20) to bulkhead

elbow (15).

Connect quick disconnect half (21) to quick

disconnect half (19) at power plant rear

bulkhead.

GO TO NEXT PAGE

6-47
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS 

1.

2.

3.

4.

Install cargo area floor plates 5.

(See TM9-2350-266-20).

Fill fuel tanks (see your -10). 6.

Connect battery ground lead (page 13-2). 7.

Start engine (see your -10). Check for leaks.

Install power plant rear access panel

(page 24-27).

Raise and lock ramp (see your -10).

Stop/shutdown engine (see your -10).

END OF TASK

6-48
TM 9-2350-261-20-1 

CLEAN FUEL CAP VENT AND FILTER SCREEN (M981 AND 

M1064 ONLY) 

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions: 

wiping rag (Item 61, App C Engine stopped/shutdown (see your –10)

Dry cleaning solvent (Item 13, App C) Carrier blocked (see your –10)

Personnel Required: 

Unit Mechanic

CLEAN

WARNING

Fuel fumes can explode and

burn you. Do not smoke or

allow open flame near carrier when removing and

cleaning fuel cap(s).

1.

2.

3.

4.

Open fuel filler combat cover (1), and remove

fuel cap (2) from filler neck (3).

Open hook (4) and remove attached chain (5)

with fuel cap (2) from spring plate (6).

While holding end of spring plate (6) out from

groove, rotate spring plate and remove from

filler neck (3).

Clean vent grommet (7) and screen cap (8) in

fuel cap (2) as follows:

a. Using pliers, pull on the tab in the center

of screen cap (8), and remove screen cap

from fuel cap (2).

NOTE

Do not remove internal filter screen from

screen cap.

b. Check vent grommet (7) to make sure it

is clean, free from damage, and secure.

c. If vent grommet (7) is damaged, replace

entire fuel cap.

GO TO NEXT PAGE

Change 2 6-48.1
TM 9-2350-261-20-1

WARNING

 Dry cleaning solvent

P-D-680 is toxic and

flammable. Wear protective

goggles and gloves; use only

in well-ventilated area;

avoid contact with skin,

eyes, and clothes, and do not breathe

vapors. Keep away from heat or flame.

Neven smoke when using solvent; the

flash point for Type I is 1000

F (380C) and

for Type II is 138°F (50°C). Failure to do so

may result in injury to death to peronnel.

d. If grommet (1) is clogged or dirty, remove

and clean with dry cleaning solvent and

clean rag.

e. Install vent grommet (1) in fuel cap (2).

Make sure it is properly seated.

WARNING

Air pressure in excess of 30

psi (207 kPa) can injure personnel. Do not direct pressurized air at hourself or

others. Always wear goggles.

f. Clean screen cap (3) with dry cleaning

solvent. Dry with compessed air.

g. Install screen cap (3) in fuel cap (2).

solvent. Dry with compessed air.

4.

5.

6.

7.

While holding one end of spring plate (4),

place other end in groove in filler neck (5).

Rotate spring plate and install in filler neck.

Install hook (6) with attached chain (7) and

fuel cap (2) to spring plate (4).

Install fuel cap (2), with attached chain (7)

in filler neck (5).

Close fuel filter combat cover (8).

END OF TASK

6-48.2 Change 2
TM 9-2350-261-20-1

REPLACE FUEL SUPPLY HOSES, TUBES, AND FITTINGS 

(M1064 ONLY) 

DESCRIPTION

This task covers: Remove (page 6-48.3). Install (page 648.6).

INITIAL SETUP References

See your –10

Tools

General Mechanics Tool Kit (Item 30, App D) Equipment Conditions 

Engine stopped/shutdown (see your –10)

Materials/Parts Carrier blocked (see your -10)

Sealing compound (Item 46, App C) Ramp lowered (see your –10)

Wiping rag (Item 61, App C) Battery ground lead disconnected (page 13-2)

Lockwasher (11) Fuel tanks drained (page 6-28)

Lockwasher (8) Power plant rear access panel removed

Strap (20) (page 24-27)

Heater duct removed (page 29-47)

Personnel Required Floor plates removed (page 24-38)

Unit Mechanic

REMOVE

1.

2.

3.

4.

WARNING

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Use wiping rags to wipe any spilled fuel.

Separate quick disconnect half (1) from quick

disconnect half (2) inside power plant rear

bulkhead.

Remove fuel supply hose (3) from nipple (4).

NOTE

Tag quick disconnect couplings before

removal.

Remove quick disconnect half (2) from

elbow (5).

Remove elbow (5) from tube assembly (6).

5. Remove tube assembly (6) from nipple (4).

6. Remove nut (7) and nipple (4) from transverse beam.

GO TO NEXT PAGE

Change 2 6-48.3
TM 9-2350-261-20-1

7.

8.

9.

Remove four screws (1), lockwashers (2),

and eight clamps (3) from weldnuts. Discard

lockwashers.

Remove clamps (3) from fuel supply

hose (4).

Disconnect fuel supply hose (4) from tee (5).

NOTE

If personnel heater is installed, plug (6)

will be replaced by a hose.

10. Remove

11. Remove

12. Remove

13. Remove

plug (6) from valve (7).

valve (7) from elbow (8).

elbow (8) from tee (5).

tee (5) from fuel supply tube (9).

14.

15.

16.

17.

18.

19.

Remove three screws (10), lockwashers (11),

and six clamps (12) from weldnuts. Discard

lockwashers.

Remove clamps (12) from fuel supply

tube (9).

Remove four screws (13), lockwashers (14),

and guard (15) from sponson. Discard

lockwashers.

Disconnect fuel supply tube (9) from

nipple (16).

Remove nipple (16) from fuel supply

hose (17).

Remove fuel supply hose (17) from

adapter (18).

6-48.4 Change 2
TM 9-2350-261-20-1

20.

21.

22.

23.

24.

25.

26.

27.

28.

29.

Remove adapter (1) from tee (2).

Disconnect two fuel supply hoses

from two elbows (5).

(3 and 4)

Remove two screws (6) and lockwashers (7)

from clamps (8). Discard lockwashers.

Remove two clamps (8) and elbows (5) from

tee (2).

Disconnect fuel supply hose (3) from

adapter

Remove

Remove

Remove

Remove

Remove

(9).

adapter (9) from valve (10).

valve (10) from adapter

adapter (11) from elbow

elbow (12) from adapter

(11).

(12).

(13).

adapter (13) from Ieft fuel

tank (14).

30.

31.

32.

33.

34.

35.

36.

37.

Remove four screws (15), Iockwashers (16),

and clamps (17) from weldnuts. Discard

lockwashers.

Remove clamps (17) and straps (18) from

fuel hoses, wiring harness, and bilge pump

tube.

Disconnect fuel supply hose (4) from

adapter (19).

Remove adapter (19) from valve (20).

Remove valve (20) from adapter (21).

Remove adapter (21) from elbow (22).

Remove elbow (22) from adapter (23).

Remove adapter (23) from right fuel

tank (24).

GO TO NEXT PAGE

Change 2 6-48.5
TM 9-2350-261-20-1 

INSTALL

3 8.

39.

40.

41.

42.

43.

44.

45.

46.

Apply a thin even coat of sealing compound

to cleaned external threads of fittings before

installation.

Install adapter (1) in right fuel tank (2).

Install elbow (3) on adapter (1).

Install adapter (4) on elbow (3).

Install valve (5) on adapter (4) with arrow

pointing away from fuel tank.

Install adapter (6) on valve (5).

Connect fuel supply hose (7) to adapter (6).

Install four clamps (8) and straps (9) as

required on fuel hoses, wiring harness, and

bilge pump tube.

Install four screws (10), new

Iockwashers (11), and clamps (8) on

weldnuts.

47,

48.

49.

50.

51.

52.

53.

54.

55.

56.

Install adapter (12) in left fuel tank (13).

Install elbow (14) on adapter (12).

Install adapter (15) on elbow (14).

Install valve (16) on adapter (15).

Install adapter (17) on valve (16).

Connect fuel supply hose (18) to

adapter (17).

Install two elbows (19) and clamps (20) on

tee (21).

Install two screws (22), new

lockwashers (23), and clamps (20) on

weldnuts.

Connect two fuel supply hoses (7 and 18) to

two elbows (19).

Install adapter (24) on tee (21).

6-48.6 Change 2
TM 9-2350-261-20-1

57.

58.

59.

60.

61.

62.

Connect fuel supply

Install nipple (3) to

Connect fuel supply

hose (1) to adapter (2). 63.

fuel supply hose (1). 64.

tube (4) to nipple (3). 65.

Install guard (5), four new lockwashers (6), 66.

and screws (7) on sponson.

67.

Install three clamps (8) on fuel supply

tube (4). 68.

Install six clamps (8), three new

lockwashers (9), and screws (10) on 69.

weldnuts.

Connect fuel supply hose (11) to tee (12).

Install

Install

Install

Install

Install

elbow (13) on tee (12).

valve (14) on elbow (13).

plug (15) on valve (14).

fuel supply tube (4) on tee (12).

four clamps (16) on fuel supply - - -

hose (11).

Install eight clamps (16), four new

lockwashers (17), and screws (18) on

weldnuts.

GO TO NEXT PAGE

Change 2 6-48.7
T M

70.

71.

72.

73.

74.

75.

Install nipple (1) and nut (2) on traverse

beam inside power plant rear bulkhead.

Connect tube assembly (3) to nipple (1).

Install elbow (4) on tube assembly (3).

Install quick disconnect half (5) on

elbow (4).

Connect fuel supply hose (6) to nipple (1).

Connect quick disconnect half (7) to quick

disconnect half (5) at power plant rear

bulkhead.

FOLLOW-THROUGH STEPS 

1.

2.

3.

4.

Fill fuel tanks (see your -10). 5.

Connect battery ground leads (page 13-2). 6.

Start engine (see your –10). Check for leaks. 7.

Install power plant rear access panel 8.

(page 24-27).

9.

Install heater duct (page 29-47).

Install floor plates (page 24-38).

Raise and lock ramp (see your -10).

Stop/shutdown engine (see your -10).

Unblock earner (see your -10).

END OF TASK

6-48.8 Change 2

9-2350-261-20-1
TM 9-2350-261-20-1

REPLACE FUEL RETURN HOSES, TUBES, AND FITTINGS 

(M1064 ONLY) 

DESCRIPTION

This task covers: Remove (page 6-48.9). Install (page 6-48.12).

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Lockwasher (5)

Lockwasher (4)

Strap (20)

Personnel Required: 

Unit Mechanic

References:

See your -10

Equipment Conditions: 

Engine stopped/shutdown (see your-10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel tanks drained (page 6-28)

Power plant rear access panel removed

(page 24-27)

Heater duct removed (page 29-47)

Floor plates removed (page 24-38)

REMOVE 5. Remove tube assembly (6) from nipple (4).

6. Remove nut (7) and nipple (4) from transverse beam.

WARNING

Fuel flowing over a metal

surface causes static

electricity. This will cause

a spark unless

is grounded.

the surface

NOTE

Use wiping rags to wipe spilled fuel.

(1) from quick

any

1. Separate quick disconnect half

2.

3,

4.

disconnect half (2) inside power plant rear

bulkhead.

Remove fuel return hose (3) from nipple (4).

NOTE

couplings before

half (2) from

Tag quick disconnect

removal.

Remove quick disconnect

elbow (5).

Remove elbow (5) from tube assembly (6).

GO TO NEXT PAGE

Change 2 6-48.9
TM 9-2350-261-20-1

‘7.

8.

9.

10.

11.

Remove four screws (1), lockwashers

and eight clamps (3) from weldnuts.

lockwashers.

Remove clamps (3) from fuel return

hose (4).

Disconnect fuel return hose (4) from

elbow (5).

(2), 12.

Discard

Remove three screws (10), lockwashers (11),

and six clamps (12) from weldnuts. Discard

lockwashers.

Remove clamps (12) from fuel return

tube (6).

Disconnect fuel return tube (6) from

Remove elbow (5) from fuel return tube (6). 15.

Remove four screws (7), lockwashers (8),

13.

14.

and guard (9) from sponson. Discard 16.

lockwashers.

nipple (13).

Remove nipple (13) from fuel return

hose (14).

Remove fuel return hose (14) from

adapter (15).

6-48.10 Change 2
TM 9-2350-261-20-1 

17.

18.

19.

20.

21.

22.

23.

24.

25.

26.

Remove adapter (1) from tee (2).

Disconnect two fuel return hoses (3 and 4)

from two elbows (5).

Remove two screws (6) and lockwashers (7)

from clamps (8). Discard lockwashers.

Remove two clamps (8) and elbows (5) from

tee (2).

Disconnect fuel return hose (3) from

adapter (9).

Remove adapter (9) from valve (10).

Remove valve (10) from adapter (11).

Remove adapter (11) from elbow (12).

Remove elbow (12) from adapter (13).

Remove adapter (13) from left fuel

tank (14).

27.

28,

29.

30.

31.

32.

33.

34.

Remove four screws (15), lockwashers (16),

and clamps (17) from weldnuts. Discard

lockwashers.

Remove clamps (17) and straps (18) from

fuel hoses, wiring harness, and bilge pump

tube.

Disconnect fuel return hose (4) from

adapter (19).

Remove adapter (19) from valve (20).

Remove valve (20) from adapter (21).

Remove adapter (21) from elbow (22).

Remove elbow (22) from adapter (23).

Remove adapter (23) from right fuel

tank (24).

GO TO NEXT PAGE

Change 2 6-48.11
TM 9-2350-261-20-1 

INSTALL

35.

36.

37.

38.

39.

40.

41.

42.

43.

Apply a thin even coat of sealing compound

to cleaned external threads of fittings before

installation.

Install adapter (1) in right fuel tank (2).

Install elbow (3) on adapter (1).

Install adapter (4) on elbow (3).

Install valve (5) on adapter (4) with arrow

pointing away from fuel tank.

Install adapter (6) on valve (5).

Connect fuel return hose (7) to adapter (6).

Install four clamps (8) and straps (9) as

required on fuel hoses, wiring harness, and

bilge pump tube.

Install four screws (10), new

lockwashers (11), and clamps (8) on

weldnuts.

44.

45.

46.

47.

48.

49.

50.

51.

52.

53.

Install adapter (12) in left fuel tank (13).

Install elbow (14) on adapter (12).

Install adapter (15) on elbow (14).

Install valve (16) on adapter (15).

Install adapter (17) on valve (16).

Connect fuel return hose (18) to

adapter (17).

Install two elbows (19) and clamps (20) on

tee (21).

Install two screws (22), new

lockwashers (23), and clamps (20) on

weldnuts.

Connect two fuel return hoses (7 and 18) to

two elbows (19).

Install adapter (24) on tee (21).

6-48.12 Change 2
54.

55.

56.

57.

58.

Connect fuel return

Install nipple (3) to

Connect fuel return

hose (1) to adapter (2). 59.

fuel return hose ( 1).

60.

tube (4) to nipple (3).

61.

Install three clamps (5) on fuel return

tube (4) . 62.

Install six clamps (5), three new

lockwashers (6), and screws (7) on weldnuts. 63.

TM 9-2350-261-20-1

Install guard (8), four new lockwashers (9),

and screws (10) on sponson.

Install elbow (11) on fuel return tube (4).

Connect fuel return hose (12) to elbow (11).

Install four clamps (13) to fuel return

hose (12).

Install eight clamps (13), four new

lockwashers (14), and screws (15) on

weldnuts.

GO TO NEXT PAGE

Change 2 6-48.13
TM 9-2350-261-20-1

64.

65.

66.

67.

68.

69.

Install nipple (1) with nut (2) on traverse

beam inside power plant rear bulkhead.

Connect tube assembly (3) to nipple (1).

Install elbow (4) on tube assembly (3).

Install quick disconnect half(5) on

elbow (4).

Connect fuel return hose (6) to nipple (1).

Connect quick disconnect half(7) to quick

disconnect half (5) at power plant rear

bulkhead.

FOLLOW-THROUGH STEPS 

1.

2.

3.

4.

Fill fuel tanks (see your-10). 5. Install heater duct (page 29-47).

Connect battery ground leads (page 13-2). 6. Install floor plates (page 24-38).

Start engine (see your–10). Check for leaks. 7. Raise and lock ramp (see your –10).

Install power plant rear access panel 8. Stop/shutdown engine (see your –10).

(page 24-27).

9. Unblock earner (see your –10).

6-48.14 Change 2

END OF TASK
TM 9-2350-261-20-1

Section IV. SPONSON MOUNTED FUEL TANKS AND LINES

(M577A2 AND M1068 ONLY)

TASK INDE X

Tas k Page

Drain Fuel Tanks

(M577A2 and M1068 Only) . . . . . . . . . . ...6-50

Replace Filler and Strainer Parts

(M577A2 and M1068 Only) . . . . . . . . . . . . . 6-52

Replace Fuel Quantity Transmitter

(M577A2 and M1068 Only) . 00.....000 l . 6-54

Replace Fuel Tank Access Covers

(M577A2 and M1068 Only) . . . . . . . . . . ...6-57

Replace Fuel Tank Filler Flange

(M577A2 and M1068 Only) . . . . . . . ... . .6-59

Tas k Page

Replace Fuel Supply Hoses,

Tubes and Fittings

(M577A2 and M1068 Only) . . . . . . . . . . ...6-60 

Replace Fuel Return Hoses,

Tubes and Fittings

(M577A2 and M1068 Only) . . . . . .. 6-66 

Replace Vent Hoses, Tubes and

Fittings (M577A2 and M1068 Only) . . 6-70

Replace Fuel Tanks

(M577A2 and M1068 Only) . . . . . . . . . . .6-73 

Change 3 6-49
DRAIN FUEL TANKS (M577A2 AND) M1068 ONLY)

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -10

Hose assembly (Item 37, App D)

Equipment Conditions:

Materials/Parts: Engine stopped/shutdown and ramp lowered

Sealing compound (Item 46, App C) (see your -10)

Wiping rag (Item 61, App C) Battery ground lead disconnected (page 13-2)

Suitable Container Rear compartment floor plates removed

(page 24-37)

Personnel Required Carrier blocked (see your -10)

Unit Mechanic

1.

2.

3.

Open fuel filler combat cover (1) and remove

filler cap.

Loosen drain plug retaining screw (2) from

under carrier. Remove drain plug (3).

Place a container (4) under hull drain

opening.

NOT E

Use wiping rag to wipe up any spilled fuel.

Place a ground strap (5) between hull and

metal container.

6-50 Change 3

TM 9-2350-261-20- 1

4 .

DRAI N
TM 9-2350-261-20-1

5. Remove pipe plug (1) from drain cock (2).

6. Install fuel drain hose (3) on drain cock (2).

Insert drain hose through hull opening into

metal container.

7. Open valve (4) and drain fuel from tanks.

8. Close valve (4) and remove hose (3) from

drain cock (2).

9.

10.

11.

12.

Apply sealing compound to threads of pipe

plug (1) and install plug in drain cock (2).

Remove ground strap (5) from hull and

metal container.

Install drain plug (6) in hull and secure

with retaining screw (7).

Install fuel filler cap. Close combat

cover (8).

WITH PERSONNEL HEATER INSTALLED

FOLLOW-THROUGH STEPS

1. Fill fuel tanks (see your -10). 3. Connect battery ground lead (page 13-2).

2. Install rear compartment floor plates 4. Raise and lock ramp (see your -10).

(page 24-37).

5. Stop/shutdown engine (see your -10).

END OF TASK

6-51
TM 9-2350-261-20-1

REPLACE FILLER AND STRAINER PART S

 (M577A2 AND M1068 ONLY)

DESCRIPTION

This task covers: Remove (page 6-52). Install (page 6-53).

—

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions:

Sealing compound (Item 46, App C) Engine stopped/shutdown (see your -10)

Gasket (2) Carrier blocked (see your -10)

Ramp lowered (see your –10)

Personnel Required: Battery ground lead disconnected (page 13-2)

Unit Mechanic Filler cover and lock removed (page 6-7)

Filler cap removed (page 6-8)

REMOV E

1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

Drain fuel tanks below level of filler flange

(1) on top of right fuel tank (page 6-50.

Disconnect two fuel tank vent hoses (2)

from two elbows (3).

Disconnect fuel return tube (4) and fuel

tank vent tube (5) from two elbows (6).

Remove two elbows (3) from lower filler

neck (7).

Remove two elbows (6) from lower filler

neck (7).

Remove 12 screws (8) and nuts (9) that

secure flange (10), lower filler neck (7), and

2 gaskets (11) to hull top opening. Discard

gaskets.

Remove filler neck (12), insert (13), and

flange (14) from hull.

Remove screw (15), nut (16), washer (17),

clamp (18), and ground lead (19) from filler

tube (20).

Remove four clamps (21), filler tube (20),

lower filler neck (7), and two hoses (22)

from fuel tank flange (1).

Check hoses and tubes. Replace worn,

crimped, or cracked parts.

6-52 Change 3

11. Check machined surfaces of parts. Repair or

replace nicked or dented parts.
TM 9-2350-261-20-1

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

Apply a thin even coat of sealing compound

to clean external threads of fittings before

installation.

Install two hoses (1), and lower filler neck

(2) with a new gasket (3) and filler tube (4)

on filler flange (5). Secure with four

clamps (6).

Install clamp (7) and ground lead (8) on

filler tube (4). Secure with screw (9), washer

(10), and nut (11).

Install flange (12), insert (13), and filler

neck screen (14) in hull.

Install flange (15), lower filler neck (2), and

new gasket (3) on hull top opening. Secure

with 12 screws (16) and nuts (17).

Install two elbows (18)

neck (2).

Install two elbows (19)

neck (2).

Connect fuel tank vent

in lower filler

in lower filler

tube (20) and fuel

return tube (21) to two eIbows (19).

Connect two fuel tank vent hoses (22) to

two elbows (18).

Fill fuel tank (see your -10).

Check filler tube and hoses for leaks.

FOLLOW-THROUGH STEPS

1. Install filler cap (page 6-8). 4. Raise and lock ramp (see your -10).

2. Install filler cover and lock (page 6-7). 5. Stop/shutdown engine (see your -10).

3. Connect battery ground lead (page 13-2).

END OF TASK

INSTAL L

6-53
TM 9-2350-261-20-l

REPLACE FUEL QUANTITY TRANSMITTE R

 (M577A2 AND M1068 ONLY)

DESCRIPTION

This task covers: Remove (page 6-54). Clean, Inspect, andl Repair (page 6-55). Install

(page 6-55).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30 App D)

Materials/Parts:

Dry cleaning solvent (Item 13, App C)

Non-elctrical wire (Item 31, App C)

Gasket

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Map board removed (see your -10)

Work tables removed

(page 24-173, 24-175 or 24-178)

REMOVE

NOT E

Right and left fuel quantity transmitter

are the same. The following steps apply to

one transmitter.

1.

2.

3.

4.

Drain fuel tank to less than 3/4 full

(page 6-50).

Disconnect lead (1) from transmitter (2).

Circuit 29 is lead for right transmitter.

Circuit 30 is lead for left transmitter.

Remove lockwire (3) from five screws (4).

Discard lockwire.

Remove five screws (4), ground lead (5),

transmitter (2), and gasket (6) from fuel

tank. Discard gasket.

6-54 Change 3
TM 9-2350-261-20-1

CLEAN, INSPECT, AND REPAIR

5. Clean gasket mating surface on top of fuel

tank with dry cleaning solvent.

INSTALL

6.

8.

9.

Install new gasket (l), transmitter (2), and

ground lead (3) on fuel tank. Secure with

five screws (4).

Install new lockwire (5) through heads of

five screws (4). Secure with double twist

method.

Connect lead (6) to transmitter (2). Circuit

29 is lead for right transmitter. Circuit 30

is lead for left transmitter.

Fill fuel tank (see your -10). Check for

leaks.

GO TO NEXT PAGE

6-55 

7. 
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Install work tables

(page 24-173, 24-175 or 24-178).

2. Check that fuel quantity transmitter operates

properly (see your -10). 5. Raise and lock ramp (see your -10).

3. Install map board (see your -10). 6. Stop/shutdown engine (see your -10).

END OF TASK

6-5 6
TM 9-2350-261-20-1

REPLACE FUEL TANK ACCESS COVER S

(M577A2 AND M1068 ONLY)

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Socket Wrench Set (Item 88, App D)

Torque Wrench (Item 99, App D)

Materials/Parts:

Gasket

Locking plate bolt (8)

Personnel Required:

Unit Mechanic

References:

See your -10

See your LO

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Map board removed (see your -10)

Work tables removed

(page 24-173, 24-175, or 24-178)

1.

2.

3.

NOT E

Left and right fuel tank access covers are

the same. The following steps apply to one

cover.

Drain fuel tank below access cover level

(page 6-50).

Remove 16 screws (1) and 8 locking plate

bolts (2) that secure fuel tank access cover

(3) and gasket (4) to fuel tank. Discard

locking plate bolts.

Remove fuel tank access cover (3) and gasket

(4) from fuel tank. Discard gasket.

INSTALL

4.

5.

6.

7.

Place new gasket (4) on access cover (3).

Place cover (3) and new gasket (4) inside fuel

tank opening. Secure with 8 new locking

plate bolts (2) and 16 screws (l).

Tighten 16 screws (1) to 36-48 lb-in

(41-55 CMKG) torque. Use torque wench and

socket wrench set.

Fill fuel tank (see your -10). Check tank for

leaks.

GO TO NEXT PAGE

Change 3 6-57

REMOV E
TM 9-2350-261-20-1

REPLACE FUEL TANK FILLER FLANGE

(M577A2 AND M1068 ONLY)

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Socket Wrench Set (Item 88, App D)

Torque Wrench (Item 99, App D)

Materials/Parts

Gasket

Locking plate bolt (8)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Map board removed (see your -10)

Work tables removed (page 24-173)

Carrier blocked (see your –10)

REMOV E 7. Secure filler hose (2) to filler flange (4) and

filler tube (3) with two clamps (l).

1. Drain fuel tank below filler flange level

(page 6-50). 8. Fill fuel tank (see your -10). Check tank for

leaks

2. Remove two clamps (1) and filler hose (2)

from filler tube (3) and filler flange (4).

3. Remove 16 screws (5), 8 locking plate bolts

(6), filler flange (4), and gasket (7) from fuel

tank. Discard gasket and locking plate bolts.

INSTAL L

4.

5.

6.

Place new gasket (7)

Place filler flange (4)

on filler flange (4).

and new gasket (7)

inside fuel tank opening. Secure with 8 new

locking plate bolts (6) and 16 screws (5).

Tighten 16 screws (5) to 36-48 lb-in

(41-55 CMKG) torque. Use torque wrench

and socket wrench set.

FOLLOW-THROUGH STEPS

1.

2.

3.

Install work tables (page 24-173). 4. Raise and lock

Install map board (see your -10). 5. Stop/shutdown

Connect battery ground lead (page 13-2).

ramp (see your -10).

engine (see your -10).

END OF TASK

Change 3 6-59
TM 9-2350-261-20-1

REPLACE FUEL SUPPLY HOSES, TUBES AND FITTING S

(M577A2 AND M1068 ONLY)

DESCRIPTION

This task covers: Remove (page 6-60). Install (page 6-63).

INITIAL SETUP

Tools:

General Mechanics Tool kit item 30, APP D )

Materials/Parts:

Sealing compound (Item 49, APP C)

Wiping rag (Item 61, App C)

Lockwasher (9)

Lockwasher (4)

Self-locking nut (4)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown and ramp lowered

(see your -10)

Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel tanks drained (page 6-50)

Power plant rear access panel removed

(page 24-29)

Rear compartment floor plates removed

(page 24-37)

REMOVE

NOTE

Use wiping rag to wipe up any spilled fuel.

2.

3.

4.

Remove shutoff valve (2) and nipple (3) from

tube (4).

Remove four screws (5) and lockwashers (6)

that secure four ground leads (7), clamps (8), 

and two elbows (9) to four weldnuts (10).

Discard lockwashers.

Remove four locknuts (11), lockwashers (12),

and screws (13) that secure four leads (7)

and clamps (14) to elbows (9) and tubes

(4 and 15). Discard locknuts and lockwashers.

1. Disconnect personnel heater fuel hose (1) from

shutoff valve (2), if installed.

6-60 Change 3
6.

7.

8.

9,

Remove plug (1) draincock

bushing (4) from tube (5).

(2), nipple (3), and

Separate plug from

draincock, draincock from nipple, and nipple

from bushing.

Remove four screws (6), lockwashers (7), and

clamps (8) that secure four hose assemblies

(9) to weldnuts (10). Discard lockwashers.

Disconnect four hose assemblies (9) from

nipples (11).

Remove four nipples (11) from two fuel

tanks (12).

Disconnect four hose assemblies (9) from two

elbows (13).

10.

11.

12.

13.

14.

TM 9-2360-261-20-1

Remove two clamps (14) and hose (15) from

elbow (13) and tube (5).

Remove two clamps (16) and hose (17) from

elbow (13) and tube (18).

Remove screw (19), lockwasher (20), and

clamp (21) that secure elbow (13) to

weldnut (22). Discard lockwasher.

Remove two clamps (23) and hose (24) from

two tubes (5 and 18).

Remove four clamps (25) that secure two

hoses (26) to two elbows (13) and fuel tanks

(12). Remove hoses.

GO TO NEXT PAGE

6-61

5.
TM 9-2350-261-20-1

15. Disconnect hose assembly (1) from 21. Remove five screws (11) and clamps (12)

adapter (2). that secure hose assembly (1) to

weldnuts (13).

16. Remove adapter (2), shutoff valve (3), and

nipple (4) from tube (5). 22. Disconnect hose assembly (1) from

nipple (10).

17.

18.

19.

20.

Separate quick-disconnect

coupling (6 and 7).

Remove elbow (8) from tube (9).

Remove quick-disconnect coupling half (7)

from elbow (8).

Remove tube (9) from nipple (10).

23. Remove jam nut and nipple (10) from power

plant compartment bulkhead.

6-62 
INSTALL

24.

25.

26.

27.

28.

29.

30.

31.

Apply a thin, even coat of sealing compound

to cleaned external pipe threads on fittings.

Install nipple (1) in power plant

compartment bulkhead. Secure with jam

nut.

Install

Install

Install

tube (2) on nipple (1).

elbow (3) on tube (2).

quick-disconnect coupling half (4) on

elbow (3).

Connect quick-disconnect coupling (4 and 5).

Connect hose assembly (6) to nipple (1).

Install hose

Secure with

assembly (6) on weldnuts (7).

five clamps (8) and screws (9).

32.

33.

34.

35.

TM 9-2350-261-20-1

Install nipple (10) in tube (11).

Install shutoff valve (12) on nipple (10 with

arrow pointing toward front of carrier.

Install adapter (13) in shutoff valve (12).

Connect hose assembly (6) to adapter (13).

GO TO NEXT PAGE

6-63 
TM 9-2350-261-20-1

36.

37.

38.

39.

40.

41.

Connect two hoses (1) to two fuel tanks (2) 42.

and elbows (3) with four clamps (4).

Connect hose (5) to tubes (6 and 7) with 43.

two clamps (8).

Secure elbow (3) to weldnut (9) with clamp 44.

(10), new lockwasher (11), and screw (12).

Connect hose (13) to elbow (3) and tube (7)

with two clamps (14). 45.

Connect hose (15) to elbow (3) and tube (6)

with two clamps (16).

Connect four hose assemblies (17) to two

Install four nipples (18) in two fuel

tanks (2).

Connect four hose assemblies (17) to four

nipples (18).

Install four hose assemblies (17) on four

weldnuts (19). Secure with four clamps (20),

new lockwashers (21), and screws (22).

Install bushing (23), nipple (24), draincock

(26), and plug (26) on tube (6).

elbows (3).

6-64
TM 9-2350-261-20-1

46. Install shutoff valve (1) on nipple (2).

47. Install nipple (2) in tube (3).

49. Install leads (7), two elbows (5), and two

tubes (3 and 6) on four weldnuts (11).

Secure with four clamps (12), new

lockwashers (13), and screws (14).

48. Install four clamps (4) on two elbows (5)

and tubes (3 and 6). Secure four ground

leads (7) to clamps (4) with four screws (8),

new lockwashers (9), and locknuts (10).

50. Connect personnel heater fuel hose (15) to

shutoff valve (1), if not connected.

51. Fill fuel tank (see your -10).

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Install rear compartment floor plates

(page 24-37).

2. Start engine (see your -10) check for leaks.

3. Install power plant rear access panel

(page 24-29).

5. Raise and lock ramp (see your -10).

6. Stop/shutdown engine (see your -10).

END OF TASK

6-65
TM 9-2350-261-20-1

REPLACE FUEL RETURN HOSES, TUBES, AND FITTINGS

(M577A2 AND M1068 ONLY)

DESCRIPTION

This task covers: Remove (page 6-66). Install (page 6-68).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App

Wiping rag (Item 61, App C)

C)

Lockwasher (8)

Self-locking nut

Personnel Required:

Unit Mechanic

References:

see your -10

REMOVE

WARNING

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Use wiping rag to wipe up any spilled fuel.

1. Disconnect return tube (1) from elbow (2).

2. Remove elbow (2) from filler neck (3).

3. Disconnect return tube (1) from nipple (4) or

tee (4.1) (M1068).

4. Remove four screws (5), lockwashers (6),

clamps (7), and return tube (1) from four

weldnuts (8). Discard lockwashers.

5. Deleted.

Equipment Conditions:

Engine stopped/shutdown and ramp lowered

(see your -10)

Battery ground lead disconnected (page 13-2)

Electronic equipment heater removed

(page 31-16)

Generator removed (page 9-81 and 9-34)

Personnel heater removed (page 29-51)

Muffler removed (page 7-20)

Power plant rear access panel removed

(page 24-29)

Map board removed (see your -10)

Carrier blocked (see your -10)

6-66 Change 4
6.

7.

8.

9

Disconnect return hose (1) from nipples (2,3)

or tee (3.1) (M1068).

10.

Remove screw (4), locknut (5), washer (6),

and clamp (7) that secure return hose (1) to

bracket (8). Discard locknut.

11.

Disconnect quick disconnect half (18) from

quick disconnect half (19).

Remove quick disconnect half (19) from

adapter (20).

12.

Remove four screws (9), lockwashers (10),

clamps (11), and return hose (1) from four

weldnuts (12). Discard lockwashers.

13

Remove adapter (20) from return tube (21).

. Disconnect return tube (21) from nipple (2).

14.

Remove two clips (13), circuit 601 lead (14),

circuit 6 cable (15), and circuit 48B cable

(16) from two cradles (17). Remove two

cradles (17).

15.

TM 9-2350-261-20-1

Remove screw (22), clamp (23), and return

tube (21) from weldnut (24).

Remove jamnut and nipple (2) from power

plant rear bulkhead.

GO TO NEXT PAGE

Change 4 6-67
TM 9-2350-261-20-1

INSTALL 23.

16. Apply a thin even coat of sealing compound

to cleaned external threads of fittings before

installation.

24.

17. Secure nipple with jamnut (1) on power

plant rear bulkhead.

25.

18. Connect return tube (2) to nipple (1).

19. Install return tube (2) on weldnut (3). Secure with clamp (4) and screw (5).

Make sure clamp is installed behind

cradle.

20. Install adapter (6) on return tube (2).

21. Install quick disconnect, half (7) on

adapter (6).

26. Position return hose (9) on four weldnuts

(16). Secure return hose (9) and two cradles (17) with four clamps (18), screws (19),

and new lockwashers (20).

22. Connect quick disconnect half (8) to quick

disconnect half (7).

27. Install circuit 48B cable (21), circuit 6 cable

(22), and circuit 601 lead (23) on two

cradles (17). Secure with two clips (24).

Install return hose (9) under bracket (10)

and connect to nipple (1).

Install nipple with jamnut (11) or tee (1.1)

(M1068) on return hose (9).

Secure return hose (9) to bracket (10) with

clamp (12), screw (13), washer (14), and

new locknut (15).

NOTE

6-68 Change 4
TM 9-2350-261-20-1

28. Install elbow (1) in filler neck (2).

29. Connect return tube (3) to elbow (1).

30. Connect return tube (3) to nipple (4) or

tee (4.1) (M1068).

31. Install return tube (3) on four weldnuts (5).

Secure with four clamps (6), new

lockwashers (7), and screws (8).

FOLLOW-THROUGH STEPS

1. Install muffler (page 7-20). 6. Start engine (see your -10). Check return

hoses for leaks.

2. Install personnel heater page 29-51).

3. Install generator (page 9-31 and 9-34).

4. Install electronic equipment heater

(page 31-16).

7. Install map board (see your -10).

8. Install power plant rear access panel

(page 24-29).

5. Connect battery ground lead (page 13-2).

9. Raise and lock ramp (see your -10).

10. Engine stopped/shutdown (see your -10).

END OF TASK

Change 4 6-69
TM 9-2350-261-20-1

REPLACE VENT HOSES, TUBES, AND FITTINGS

(M577A2 AND M1068 ONLY)

DESCRIPTION

This task covers: Remove (page 6-70). Install (page (6-71).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Lockwasher (12)

Lockwasher (5)

Suitable container

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Battery ground lead disconnected 13-2)

Engine stopped and ramp lowered

(page

(see your -10)

Map board removed (see your -10)

Work tables removed (page 24-178)

Carrier blocked (see your -10)

REMOVE

1. Drain fuel tanks below level of vent hoses

(page 6-50).

5. Remove seven screws (6), lockwashers (7),

clamps (8), and vent hoses (1 and 3) from

seven weldnuts (9). Discard lockwashers.

2. Disconnect vent hose (1) from elbow (2).

3. Disconnect vent hose (3) from elbow (4).

4. Disconnect vent hoses (1 and 3) from two

elbows (5).

6. Remove five screws (10), lockwashers (11),

clamps (12), and vent hoses (1 and 3) from

five weldnuts (13). Discard lockwashers.

7. Remove three elbows (2, 4, and 14) and

nipple (15) from left fuel tank (16).

6-70 Change 3
TM 9-2350-261-20-1

8. Disconnect vent tube (1) from two INSTAL L

elbows (2 and 3).

. 12. Apply a thin, even coat of sealing compound

9. Remove five screws (4), lockwashers (5), to cleaned external threads of fittings.

clamps (6), and vent tube (1) from five

weldnuts (7). Discard lockwashers. 13. Install bushing (10) in right fuel tank (11).

10. Remove two elbows (8) and elbow (2) from 14. Install elbow (3) on bushing (10).

filler neck (9).

15. Install two elbows (8) and elbow (2) in filler

11. Remove elbow (3) and bushing (10) from neck (9).

right fuel tank (11).

GO TO NEXT PAGE

6-71
TM 9-2350-261-20-1

16.

17.

18.

19.

20.

21.

Install two elbows

tank (3).

(1 and 2) in left fuel

Install nipple (4) in elbow (2).

Install elbow (5) on nipple (4).

Connect vent tube (6) to two

elbows (7 and 8).

Install vent tube (6) on five weldnuts (9).

Secure with five clamps (10), new

kxkwashers (11), and screws (12).

Connect vent hose (13) to elbow (1) at left

fuel tank (3).

22.

23.

24.

25.

26.

Connect vent hose (14) to elbow (5) at left

fuel tank (3).

Connect two vent hoses (13 and 14) to two

elbows (15) at filler neck (16).

Install two vent hoses (13 and 14) on seven

weldnuts (17). Secure with seven clamps

(18), new lockwashers (19), and screws (20).

Secure vent hose (14) to five weldnuts (21)

with five clamps (22), new lockwashers (23),

and screws (24).

Fill fuel tanks. Check for leaks

(see your -10).

FOLLOW-THROUGH STEPS

1. Install map board (see your -10). 4. Raise and lock ramp (see your -10).

2. Install work tables (page 24-178). 5. Stop engine (see your -10).

3. Connect battery ground lead (page 13-2).

END OF TASK

6-72 
TM 9-2350-261-20-1

REPLACE FUEL TANKS (M577A2 AND M1068 ONLY)

DESCRIPTIO N

This task covers: Remove (page 6-73). Install (page 6-74).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Key washers (6)

Self-locking nut (4)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown and ramp lowered

(see your -10)

Battery ground lead disconnected (page 13-2)

Map board removed (see your -10)

Work tables removed

(page 24-173, 24-175 or 24-178)

Fuel tanks drained (page &50)

Rear bilge pump discharge tube removed

(page 16-11)

Fuel quantity transmitter removed

(page 6-54)

Fuel tank access cover removed (page 6-57)

Fuel tank filler flange removed (page 6-59)

1.

2.

3.

4.

5.

Disconnect four supply hoses (1) and four

adapters (2) from fuel tanks (3 and 4).

Loosen two clamps (5) and remove two

supply hoses (6) from fuel tanks (3 and 4).

Disconnect vent hose (7) from elbow (8).

Disconnect vent hose (9) from elbow (10).

Remove six screws (11), key washers (12),

two plates (13), and two brackets (14) that

secure front of fuel tanks (3 and 4) on

sponson. Discard tab washers.

GO TO NEXT PAGE

Change 3 6-73

REMOVE 
TM 9-2350-261-20-1

6.

7.

8.

9.

10.

11.

12.

13.

14.

Remove four locknuts (1), screws (2),

12 washers (3), and 4 mounts (4) that

secure bottom of fuel tanks (5 and 6) to

sponson.

Disconnect vent tube (7) from elbow (8).

Remove four screws (9), plates (10), eight

washers (11), and four mounts (12) that

secure bottom of fuel tanks (5 and 6) to

sponson.

Remove two fueliel tanks (5 and 6)

trom carrier.

Remove elbow (13) from left fuel tank (5).

Remove eIbow (14) from nipple (10.

Remove nipple (16) and elbow (16) from left

fuel tank (5).

Remove elbow (8) and bushing (17) from

right fuel tank (6).

Remove plug (18) from right fuel tank (6).

INSTALL

15.

16.

17.

18.

19.

20.

21.

22.’

23.

24.

25.

Apply a thin, even coat of sealing compound

to cleaned external threads of fittings.

Install

Install

Install

Install

Install

Install

Install

plug (18) in right fuel tank(6).

bushing (17) in fuel tank (6).

elbow (8) in bushing (17).

elbow (13) in left fuel tank (5).

eIbow (16) in left fuel tank (5).

nipple (15) in elbow (16).

elbow (14) on nipple (15).

Place fuel tanks (5 and 6) on left and right

sponsons.

Secure top of two fuel tanks (5 and 6) to

hull with four screws (9), plates (10), eight

washers (11), and four mounts (12).

Secure bottom of two fuel tanks (5 and 6)

to sponson with four new locknuts (1),

screws (2), 12 washers (3), and four

mounts (4).

-

6-74
TM 9-2350-261-20-1

26.

27.

28.

29.

30.

Secure front of two fuel tanks (1 and 2) to

sponson with six screws (3), new key

washers (4), two plates (5), and bracket (6).

Connect vent hose (7) to elbow (8).

Connect vent hose (9) to elbow (10).

Install two supply hoses (11) on fuel tanks

(1 and 2). Secure with two clamps (12).

Connect four supply hoses (13)

adapters (14) on fuel tanks (1

with four

FOLLOW-THROUGH STEPS

1.

2.

3.

4.

5.

6.

Install fuel tank filler flange (page 6-59). 7.

Install fuel tank access covers (page 6-57) 8.

Install fuel quantity transmitter (page (6-54. 9.

Install rear bilge pump discharge tube 10.

(page 16-11).

start

Raise

engine (see your -10). Check for leaks.

and lock ramp (see your -10).

Stop/shutdown engine (see your -10).

Install work tables

(page 24-173, 24-175 or 24-178).

Fill fuel tanks (see your -10). 11. Install map board (see your -10).

Connect battery ground lead (page 13-2).

END OF TASK

6-75

) and 2).
TM 9-2350-261-20-1

Section V. FUEL COMPARTMENT AND HOSES, TUBES, AN D

FITTINGS (M125A2 AND M106A2 ONLY)

TASK INDE X

Task Page Tas k Page

Drain Fuel Compartment (M125A2 Replace Fuel Quantity Transmitter

and M106A2 Only) l . 0.00..... . . .000.0.0. . 6-77 (M125A2 and M106A2 Only) . . . . . . . . ...6-80

Replace Filler Cap and Strainer Replace Compartment to Bulkhead

Parts (M125A2 and M106A2 Only) . ...6-78 Fuel Hoses, Tubes, and Fittings

Replace Fuel Compartment Access

(M125A2 and M106A2 Only) . . . . . . . . ...6-81

Cover (M125A2 and M106A2 Only) . ..6-79 Replace Fuel Tank Internal Fuel

Hoses, Tubes, and Fittings (M125A2

and M106A2 Only) . .......... .. ........,................... 6-85

6-76
TM 9-2350-261-20-1

DRAIN FUEL COMPARTMENT (M125A2 AND M106A2 ONLY )

INITIAL SETU P

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions:

Wiping rag (Item 61, App C) Engine stopped/shutdown (see your -10)

Suitable size container Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Personnel Required:

Unit Mechanic

DRAI N

1.

2.

3.

4.

5.

Open fuel filler combat cover (1). Remove fuel

filler cap (see your -10).

NOT E

Fuel tank capacity is 95 gallons.

Place a suitable size container (2) directly behind earner and under left rear fender.

WARNIN G

Fuel flowing over a metal

l surfac e causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOT E

Use wiping rag to wipe up any spilled fuel.

Make sure metal container (2) is making

metal-to-metal contact with carrier so that

there is a good ground.

Remove drain plug (3) from left rear bulkhead above fender, and drain fuel.

Apply sealing compound to cleaned threads of

drain plug (3). Install plug in left rear bulkhead.

6. Install fuel filler cap. Close filler combat cover

(1) to keep dirt out of fuel compartment.

FOLLOW-THROUGH STEP S

1. After maintenance has been performed, fill Z. Connect battery ground lead (page 13-2)

fuel compartment (see your -10).

END OF TASK

6-77
TM 9-2350-261-20-1

REPLACE FILLER CAP AND STRAINER PARTS (M125A2 AND 

M106A2 ONLY)

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts

Non-electrical wire (Item 31, App C)

Gasket

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Battery ground lead disconnected (page 13-2)

Filler cover and lock removed (page 6-7)

Fuel compartment drained (page 6-77)

Carrier blocked (see your -10)

REMOV E

1.

2.

Remove fuel filler cap (1) and retainer (2)

from fuel filler neck (3).

Remove lockwire (4), 12 screws (5), filler neck

(3), strainer (6), and gasket (7) from fuel

compartment access cover (8). Discard gasket

and lockwire.

3. Open spring clip (9) and disconnect filler cap

(1) chain from retainer (2).

INSTAL L

4.

5.

6.

Install strainer (6) in fuel compartment

access cover (8).

Place filler cap (1) chain through filler neck

(3). Secure retainer (2) to chain with spring

clip (9).

Install filler neck (3) and new gasket (7) on

7. Install new lockwire (4) on filler neck

through the heads of 12 screws (5).

(3)

fuel compartment access cover (8). Secure

with 12 screws (5).

8. Install filler cap (1) in tiller neck (3).

FOLLOW-THROUGH STEPS

1. Install filler cover and lock (page 6-7). 3. Fill fuel compartment (see your -10).

2. Connect battery ground lead (page 13-2).

6-78

END OF TASK
TM 9-2350-261-20-1

REPLACE FUEL COMPARTMENT ACCESS COVE R

(M125A2 AND M106A2 ONLY)

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Torque Wrench (Item 96, App D)

Materials/Parts:

Gasket

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Battery ground lead disconnected (page 13-2)

Filler cover and lock removed (page 6-7)

Filler cap and strainer parts removed

(page 6-78)

REMOVE

1. Remove eight screws (l), washers (2), fuel

compartment access cover (3), and gasket (4)

from fuel compartment (5). Discard gasket.

3.

Install new gasket (4) and fuel compartment

access cover (3) on fuel compartment (5).

Secure with eight washers (2) and

Screws (1).

Tighten eight screws (1) to 60-65 lb-ft

(81-88 N-m) torque. Use torque wrench.

FOLLOW-THROUGH STEP S

1. Install filler cap and strainer parts 2. Install filler cover and lock (page 6-7).

(page 6-78).

3. Connect battery ground lead (page 13-2).

END OF TASK

6-79

2.
TM 9-2350-261-20-1

REPLACE FUEL QUANTITY TRANSMITTE R

(M125A2 AND M106A2 ONLY)

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Gasket

Non-electrical wire (Item 31, App C)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel compartment drained (page 6-77)

REMOV E

1. Disconnect circuit 28 lead (1) from fuel quantity transmitter (2).

2. Remove lockwire (3) from five screws (4). Dis3.

card Iockwire.

Remove five screws (4), washers (5),

transmitter (2), and gasket (6) from fuel

compartment. Discard gasket.

INSTAL L

4. Place new gasket (6) and transmitter (2) in

fuel compartment. Secure with five screws (4)

and washers (5).

5. Install new lockwire (3) through the heads of

five screws (4).

6. Connect circuit 28 lead (1) to fuel quantity

transmitter (2).

FOLLOW-THROUGH STEP S

1. Fill fuel compartment (see your -10). 3. Raise and lock ramp (see your -10).

2. Connect battery ground lead (page 13-2). 3. Stop engine (see your -10).

END OF TASK

6-80
TM 9-2350-261-20-1

REPLACE COMPARTMENT TO BULKHEAD FUEL HOSES, TUBE S

AND FITTINGS (M125A2 AND M106A2 ONLY)

DESCRIPTIO N

This task covers: Remove (Page 6-81). Install (Page 6-83).

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Self-locking nut

Self-locking nut (2)

Lockwasher (7)

Personnel Required:

Unit Mechanic

References:

See your –10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrer blocked (see your -10)

Ramp lowered (see your -10)

Battery g-round lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-29)

Fuse stowage racks removed (page 24-186)

Floor plates removed (page 24-38)

Fuel compartment drained (page 6-77)

Use wiping rag to wipe up any spilled fuel.

1. Separate two quick-disconnect fittings

(1 and 2) inside power plant rear bulkhead.

2.

3.

4.

5.

6.

Disconnect fuel supply hose (3) and fuel return hose (4) from two nipples (5).

NOT E

Tag quick disconnect couplings before

removal.

Remove two quick-disconnect fittings (2) from

two elbows (6).

Remove two elbows (6) from two tube

assemblies (7).

Remove two tube assemblies

nipples (5).

Remove two nipples (5) from

(7) from two

transverse

beam.

GO TO NEXT PAGE

6-81
TM 9-2350-261-20-1

7.

8.

9.

Remove two screws (1), washers (2) one 15.

locknut (3) and guard (4) from hull. Discard

locknut.

Remove seven screws (5), lockwashers (6), 16.

fourteen clamps (7) fuel supply hose (8), and

fuel return hose (9) from seven weldnuts

(10). Discard lockwashers.

Disconnect fuel supply hose (8) from

eIbow (11).

10. Disconnect fuel return hose (9) from

elbow (12).

11. Disconnect elbow (11) from fuel supply

tube (13).

12. Disconnect elbow (12) from fuel return

tube (14).

13. Disconnect fuel supply tube (13)

adapter (15).

14. Disconnect fuel return tube (14)

adapter (16).

from

from

17.

18.

19.

20.

21.

Remove two screws (17) locknuts (18), and

guard (19) from two brackets (20). Discard

locknuts.

Remove adapter (15) from fuel shutoff

valve (21).

Remove adapter (16) from elbow (22).

Remove shutoff valve (21) from elbow

Remove elbows (22 and 23) from two

nipples (24).

(23).

Remove two nipples (24) from fuel

compartment (25).

Remove nipple (26), elbow (27) and pipe

6-82 
TM 9-2350-261-20-1

INSTAL L 28. Connect fuel return tube (11) to adapter (9).

22. Apply a thin, even coat of sealing compound

to cleaned external threads of fittings.

23. Install pipe plug (l), in elbow (2), on nipple

(3). Secure nipple (3) and two nipples (4) in

fuel compartment (5).

24. Install elbows (6 and 7) on two nipples (4).

25. Install fuel shutoff valve (8) on elbow (7)

with arrow pointing down.

26. Install adapter (9) in elbow (6).

27. Install adapter (10) in shutoff valve (8).

29. Connect fuel supply tube (12) to

adapter (10).

30. Secure guard (13) to two brackets (14) with

two screws (15) and new locknuts (16).

31. Connect elbow (17) to fuel return tube (11).

32. Connect elbow (18) to fuel supply tube (12).

33. Connect fuel supply hose (19) to elbow (17).

34. Connect fuel return hose (20) to elbow (18).

GO TO NEXT PAGE

6-83
TM 9-2350-261-20-1

35. Install two nipples (1) in transverse beam.

36. Connect fuel supply hose (2) and fuel return

hose (3) to two nipples (l).

37. Connect two tube assemblies (4) to two

nipples (1).

38. Connect two elbows (5) to two tube

assemblies (4).

39. Install two quick-disconnect fittings (6) on

two elbows (5).

40. Install fuel supply hose (2) and fuel return

hose (3) on seven weldnuts (7). Secure with

fourteen clamps (8), seven new Iockwashers

(9) and seven screws (10).

41. Secure guard (11) to hull with two washers

(12), screws (13), and one new locknut (14).

42. Connect two quick-disconnect fittings

(6 and 15) inside power plant bulkhead.

FOLLOW-THROUGH STEP S

1. Fill fuel compartment (see your -10). 5. Install fuse stowage rack (page 24-186).

2. Connect battery ground lead (page 13-2). 6. Raise and lock ramp (see your -10).

3. Start engine (see your -10) Check for leaks. 7. Stop/shutdown engine (see your -10).

4. Install floor plates (page 24-38). 8. Install power plant rear access panel

(page 24-29).

END OF TASK

6-64
TM 9-2350-261-20-l

REPLACE FUEL TANK INTERNAL HOSES, TUBES, AND

FITTINGS (M125A2 AND M106A2 ONLY)

DESCRIPTION

This task covers: Remove (page 6-85). Install (page 6-86).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Non-electrical wire (Item 31, App C)

Wiping rag (Item 61, App C)

Personnel Required:

Unit Mechanic

References:

See your-10

Equipment Conditions:

Carrier blocked (see your-10)

Engine stopped/shutdown (see your-10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel compartment drained (page 6-77)

Filler cover and lock removed (page 6-7)

Filler cap and strainer parts removed

(page 6-78)

Fuel compartment access cover removed

(page 6-79)

REMOVE

WARNING

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Use wiping rag to wipe up any spilled fuel.

1. Remove lockwire (1), five screws (2), and

clamps (3) that secure fuel pickup tube (4)

and fuel return tube (5) to five weldnuts

(6). Discard lockwire.

2.

3.

4.

5.

Disconnect pickup

Remove elbow (7)

compartment (8).

Disconnect return

Remove elbow (9)

compartment (8).

tube (4) from elbow (7).

from fuel

tube (5) from elbow (9).

6-85
TM 9-2350-261-20-1

INSTALL

6.

7.

8.

9.

10.

Install elbows (1 and 2) in fuel

compartment (3).

Connect fuel return tube (4) to elbow (2).

Connect fuel pickup tube (5) to elbow (l).

Install pickup tube (5) and return tube (4)

on five weldnuts (6). Secure with five

clamps (7) and screws (8).

Install new lockwire (9) through the heads

of five screws (8) and around return tube

(4) and pickup tube (5).

FOLLOW-THROUGH STEPS

1. Install fuel compartment access cover 4. Fill fuel compartment (see your-10).

(page 6-79).

5. Connect battery ground lead (page 13-2).

2. Install fuel cap and strainer parts

(page 6-78). 6. Raise and lock ramp (see your -10).

3. Install filler cover and lock (page 6-7). 7. Stop/shutdown engine (see your-10).

END OF TASK

6-86
TM 9-2350-261-20-1

Section VI. FUEL COMPARTMENT, BLADDER, HOSES, TUBES,

TASK INDE X

AND FITTINGS (M741A1 ONL Y

Tas k Page

Drain Fuel Bladder (M741A1 Only)......................... ..6-88

Replace Filler Cap and Strainer

Parts (M741A1 Only) . . . . . . . . . . . . . . . . . . ...6-89

Replace Fuel Compartment Access

Cover (M741A1 Only).................. ... . . . . . . . . . . . . . . . . ...6-91

Replace Fuel Bladder Filler Flange

(M741A1 only) .......................... . . ...... . . . ........... 6-92

Tas k Page

Replace Fuel Quantity Transmitter

(M741A1 only) . . . . . . . . . . . . . . . . . . . . . . . ....6-93

Replace Fuel Compartment Bladder

(M741A1 only) ..................... .......................... 6-94

Replace Compartment to Bulkhead

Fuel Hoses, Tubes, and Fittings

(M741A1 only) . . . . . . . . . . . . . . . . . . . . . . . . .. 6-98

6-87
TM 9-2350-261-20-1

DRAIN FUEL BLADDER (M741A1 ONLY)

INITIAL SETU P

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -10

Materials/Parts: Equipment Conditions:

Sealing Compound (Item 46, App C) Engine stopped (see your -10)

Wiping rag (Item 61, App C) Carrier blocked (see your -10)

Suitable size container Battery ground lead disconnected (page 13-2)

Personnel Required:

Unit Mechanic

DRAI N

1. Open fuel filler combat cover (1). Remove fuel

filler cap (see your -10).

NOT E

Fuel tank capacity is 95 gallons.

2.

3.

4.

Place a suitable container (2) behind left rear

fender.

Make sure metal container (2) is making

metal-to-metal contact with carrier so that

there is a good ground.

Remove drain plug (3) from fuel

compartment.

WARNING

5.

6.

7.

8.

9.

NOT E

Use wiping rag to wipe up any spilled fuel.

Remove drain plug (4) from bladder through

fuel compartment drain opening. Drain fuel.

After fuel is drained, apply a thin, even coat

of sealing compound to clean threads of drain

plugs (3 and 4).

Install drain plug (4) in fuel bladder through

fuel compartment drain opening.

Install drain plug (3) in fuel compartment.

Install fuel filler cap (see your -10). Close

filler combat cover (1).

FOLLOW-THROUGH STEPS

1. After maintenance has been performed, fill 2. Connect battery ground lead (page 13-2).

fuel compartment (see your -10).

END OF TASK

6-88
TM 9-2350-261-20-1

REPLACE FILLER CAP AND STRAINER PARTS (M741A1 ONLY)

INITIAL SETUP

Tools: References:

General Mechanics Tool kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions:

Nonelectrical wire (Item 31, App C) Engine stopped/shutdown (see your –10)

Gasket Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Personnel Required: Filler cover and lock removed (page 6-7 )

Unit Mechanic

REMOVE

1.

2.

3.

Remove lock wire (1), 12 screws (2), filler

neck (3), strainer (4), gasket (5), and flange

(6) from fuel compartment access cover (7).

Discard gasket and lock wire.

Open spring clip (8) and disconnect filler cap

(9) chain from retainer (10).

Remove filler cap (9) and retainer (10) from

fuel tiller neck (3).

INSTALL

4.

5.

6.

7.

8.

Install flange (6) in fuel compartment access

cover (7).

Install strainer (4) in flange (6).

Place filler cap (9) chain through filler neck

(3). Secure retainer (10) to filler cap chain

with spring clip (8) .

Install retainer (10) in filler neck (3).

Secure filler neck (3) and new gasket (5) to

fuel compartment access cover (7) with 12

9. Install new lock wire (1) through the heads

of 12 screws (2). Secure with double twist

method.

10. Install filler cap (9) in filler neck (3).

screws (2).

GO TO NEXT PAGE

6-89
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1. Install filler cover and lock (page 6-7). 2. Connect battery ground lead (page 13-2).

END OF TASK

60-9 0
TM 9-2350-261-20-1

REPLACE FUEL COMPARTMENT ACCESS COVE R

(M741A1 ONLY)

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Torque Wrench (Item 96, App D)

Materials/Partsi

Gasket

Seal

Personnel Required:

Unit Mechanic

References:

see your-10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10

Battery ground lead disconnect (page 13-2)

Filler cover and lock removed (page 6-7)

Filler cap and strainer parts removed

(page 6-89)

REMOVE

1.

2.

Remove six screws (1) that secure access

cover (2) to filler flange (3).

Remove eight screws (4), washers (5), access

cover (2), gasket (6), and seal (7) from fuel

compartment opening. Discard gasket and

seal.

INSTALL

3.

4.

5.

6.

Install new gasket (6) and access cover (2)

on fuel compartment opening. Secure with

eight screws (4) and washers (6).

Tighten eight screws (4) to 60-65 lb-ft

(81-88 N-m) torque. Use torque wrench.

Secure access cover (2) to filler flange (3)

with six screws (1).

Install new seal (7) between access cover (2)

and filler flange (3). Cut to length and press

seal between cover (2) and flange (3). No gap

allowed between filler flange and access cover.

FOLLOW-THROUGH STEPS

1. Install filler cap and strainer parts 2. Install filler cover and lock (page 6-7).

(page 6-89).

3. Connect battery ground lead (page 13-2).

END OF TASK

6-91
TM 9-2350-261-20-1

REPLACE FUEL BLADDER FILLER FLANGE (M741A1 ONLY)

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -lo

Socket Wrench Set (Item 88, App D)

Torque Wrench (Item 99, App D) Equipment Conditions:

Materials/Parts: Engine stopped/shutdown (see your -10)

Battery ground lead disconnected (page 13-2)

Non-electrical wire (Item 31, App C) Filler cover and lock removed (page 6-7)

Filler cap and strainer parts removed

Personnel Required: (page 6-89)

Unit Mechanic Fuel compartment access cover removed

(page 6-91)

Fuel tank bladder drained (page 6-88)

REMOVE

1. Remove lockwire (1), 24 screws (2), and filler

flange (3) from fuel bladder (4). Discard lockwire.

INSTALL

2.

3.

4.

5.

Secure filler flange (3) to fuel bladder (4)

with 24 screws (2).

Tighten 24 screws (2) to 10-12 Ib-in

(11-13 CMKG) torque; Use torque wrench

and socket wrench set.

Tighten screws (2) again to 40-60 lb-in

(46-69 CMKG) torque, using cross torque

pattern. Use torque wrench and socket

wrench set.

Install new lockwire (1) through the heads of

24 screws (2).

FOLLOW-THROUGH STEPS

1. Install fuel compartment access cover 3. Install filler cover and lock (page 6-7).

(page 6-91).

4. Fill fuel bladder (see your –10).

2. Install filler cap and strainer parts

(page 6-89). 5. Connect battery ground lead (page 13-2).

.

END OF TASK

6-92
TM 9-2350-261-20-1

REPLACE FUEL QUANTITY TRANSMITTER (M741A1 ONLY)

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Non-electrical wire (Item 31, App C)

Gasket

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel bladder drained (page 6-88)

REMOVE

1.

2.

Disconnect circuit 28 lead (1) from fuel quantity transmitter (2).

Remove lock wire (3), five screws (4),

washers (5), transmitter (2), and gasket (6)

from fuel bladder (7). Discard lock wire and

gasket.

INSTALL

3.

4.

Place new gasket (6) and transmitter (2) on

fuel bladder (7). Secure with five screws (4)

and washers (5).

Install new lock wire (3) through the heads

of five screws (4).

FOLLOW-THROUGH STEPS

1. Fill fuel bladder (see your -10). 3. Raise ramp (see your -10).

2. Connect battery ground lead (page 13-2). 4. Stop/shutdown engine (see your –10).

END OF TASK

6-93
TM 9-2350-261-20-1

REPLACE FUEL COMPARTMENT BLADDER (M741A1 ONLY )

DESCRIPTION

This task covers: Remove (page 6-94). Clean, Inspect, and Repair (page 6-95).

Install (page 6-96).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Nonelectrical wire (Item 31, App C)

Sealing compound (Item 46, App C)

Sealing compound (Item 52, App C)

Cotter pin (2)

Gasket

Lockwasher (4)

Personnel Required:

Unit Mechanic

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Battery ground lead disconnected (page 13-2)

Fuel bladder drained (page 6-88)

Filler cover and lock removed (page 6-7)

Filler cap and strainer parts removed

(page 6-89)

Fuel compartment access cover removed

(page 6-91)

Fuel bladder filler flange removed” (page 6-92)

Fuel quantity transmitter removed

(page 6-93)

REMOVE 3. Remove elbow (9) and pipe plug (10) from

bladder (4).

1. Remove fuel return hose (1), adapter (2), and

elbow (3) from bladder (4). 4. Remove lockwire (11) from eight screws (12).

Discard lockwire.

2. Remove fuel supply hose (5), adapter (6),

shutoff valve (7), and elbow (8) from

bladder (4).

5. Remove eight screws (12), four flat washers

(13), and lockwashers (14) that secure

bladder (4) to compartment (15). Discard

 lockwashers.

6-94
6.

7.

8.

9.

Remove two cotter pins (1) that secure two 10.

hanger rods (2) to two brackets (3). Discard

cotter pins.

11.

Remove two hanger rods (2) that secure

bladder (4) to seven eyebolts (5) and

brackets (6). 12.

TM 9-2350-261-20-1

Disconnect hose assembly (8), adapter (9),

and elbow (10) from supply tube (11).

Remove grommet (12) and hose assembly

(8) from reinforcement (13).

Remove gasket (14) from bladder (4).

Discard gasket.

Remove bladder (4) through compartment (7)

top opening. CLEAN, INSPECT, AND REPAIR

Remove seven eyebolts (5) from inside com- 13.

partment (7).

14.

Check fuel bladder. Note direct support

maintenance for repair of bladder. Replace

cracked, broken, or leaky bladder that

cannot be repaired.

Check inside of bladder compartment.

Smooth rough areas and clean inside of

bladder compartment.

GO TO NEXT PAGE

6-96
TM 9-2350-261-20-1

INSTALL

15.

16.

17.

18.

19.

20.

21.

Apply a thin even coat of sealing compound

(Item 52) to gasket mounting surface on

bladder compartment.

Allow sealing compound to become tacky and

install new gasket (1) on bladder (2).

Apply a thin even coat of sealing compound

(Item 46) to cleaned external threads of fit.

tings before installation.

Install elbow (3) and adapter (4) on supply

tube (5).

Install hose assembly (6) in

reinforcement (7).

Install grommet (8) on hose assembly (6).

Connect hose assembly (6) to adapter (4).

22.

23.

24.

25.

26.

27.

Install seven eyebolts (9) inside compartment (10). Align to accept hanger rods (11)

when bladder (2) is installed.

Fold and compress bladder (2). Install in

compartment (10) through top opening with

bladder openings aligned with compartment

openings.

Align ferrules on top of bladder (2) with eyebolts (9) and brackets (12). Start two

hanger rods (11) through ferrules, eyebolts

(9), and brackets (12).

Alternate from side to side until hanger rods

(11) are through all bladder ferrules,

eyebolts (9), and brackets (12).

Secure two hanger rods (11) to two brackets

(13) with two new cotter pins (14).

Push bladder (2) into compartment (10) so

it unfolds.

I

6-96
28.

29.

30.

Secure bladder (1) to compartment (2) front, 31.

rear, and side openings with eight screws

(3) four flat washers (4) and four new 32.

lockwashers (5).

Install new lockwire (6) through the heads 33,

of eight screws (3).

Install elbow (7) and pipe plug (8) in 34.

bladder (1).

TM 9-2350-261-20-1

Install elbow (9) in bladder (1).

Install shutoff valve (10) on elbow (9) with

arrow pointing down.

Install adapter (11 ) and fuel supply hose

(12) on shutoff valve ( 10).

Install elbow (13), adapter (14), and fuel

return hose (15) on bladder (1).

FOLLOW-THROUGH STEPS

1. Install fuel quantity transmitter (page 6-93). 5. Install filler cover and lock (page 6-7).

2. Install fuel bladder filler flange (page 6-92). 6. Fill fuel bladder (see your –10). Check for

leaks.

3. Install fuel compartment access cover

(page 6-91). 7. Connect battery ground lead (page 13-2).

4. Install filler cap and strainer parts 8. Start engine (see your –10). Check for leaks.

(page 6-89).

9. Stop/shutdown engine (see your –10).

END OF TASK

6-97
TM 9-2350-261-20-1

REPLACE COMPARTMENT TO BULKHEAD FUEL HOSES, TUBES ,

AND FITTINGS (M741A1 ONLY)

DESCRIPTION

This task covers: Remove (page 6-98). Install (page 6-99).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Ramp lowered (see your -10)

Engine stopped/shutdown (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page (24-27)

Floor plates removed (page 24-40)

Ammunition stowage containers removed

(page 24-199)

Fuel bladder drained (page 6-88)

1.

2.

3.

4.

5.

6. Remove two jamnuts and nipples (5) from

transverse beam.

WARNING

Fuel flowing over a metal 7. Remove 8 screws (8), 16 clamps (9), and fuel

surface causes static hoses (3 and 4) from 8 weldnuts (10).

electricity. This will cause a

spark unless the surface is

grounded.

NOTE

Use wiping rag to wipe up any spilled fuel.

Tag hoses before removing.

Disconnect two quick disconnect coupling

halves (1) from two quick disconnect coupling

halves (2) inside power plant rear bulkhead.

Disconnect fuel supply hose (3) and fuel return hose (4) from two nipples (5) in

transverse beam.

Remove two quick disconnect coupling halves 

(2) from two elbows (6).

Remove two elbows (6) from two tube

assemblies (7).

Remove two tube assemblies (7) from two

nipples (5).

6-98

REMOVE 
8. Disconnect fuel supply hose (1) and fuel return hose (2) from adapters (3 and 4) on

bladder (5).

9. Remove adapter (3) from shutoff valve (6).

10. Remove adapter (4) from elbow (7).

11. Remove shutoff valve (6) from elbow (8).

12. Remove pipe plug (9) from elbow (10).

13. Remove three elbows (7, 8, and 10) from

bladder (5).

14. Check decals (11) on fuel tank (12). Replace

decals that cannot be read (page 24-217).

TM 9-2350-261-20-1

INSTALL

15. Apply a thin even coat of sealing compound

to cleaned external threads of fittings before

installation.

16. Install three elbows (7, 8, and 10) on

bladder (5).

17. Install shutoff valve (6) on elbow (8) with

arrow pointing down.

18. Install pipe plug (9) in elbow (10).

19. Install adapter (4) in elbow (7).

20. Install adapter (3) in shutoff valve (6).

21. Connect fuel supply hose (1) and fuel return

hose (2) to adapters (3 and 4).

GO TO NEXT PAGE

6-99
TM 9-2350-261-20-1

22.

23.

24.

25.

26.

27.

28.

Install two nipples (1) in transverse beam

and secure with two jamnuts.

Connect fuel supply hose (2) and fuel return

hose (3) on two nipples (1).

Install two tube assemblies (4) to two

nipples (1).

Install two elbows (5) to two tube

assemblies (4).

Connect two quick disconnect coupling halves

(6) to two elbows (5).

Connect two quick disconnect coupling halves

(7) to two quick disconnect coupling halves

(6) inside power plant bulkhead.

Connect fuel supply hose (2) and fuel return

hose (3) to 8 weldnuts (8) with 16 clamps

(9) and 8 screws (10).

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13–2). 5. Install floor plates (page 2440).

2. Fill fuel bladder (see your -10). 6. Install ammunition containers (page 24-199).

3. Start engine (see your –10). Check for leaks. 7. Raise and lock ramp (see your -10).

4. Install power plant rear access panel

(page 24-27).

8. Stop/shutdown engine (see your -10).

END OF TASK

6-100
TM 9-2350-261-20-1

Section VU. BULKHEAD TO INJECTORS ENGINE FUEL AN D

AIR HOSE S

TASK INDE X

Tas k

Engine Fuel System Diagram . . . . . . . . .

Replace Bulkhead Connection to

Primary Fuel Filter Hose . . . . . . . . . . . . . .

Replace Primary Fuel Filter to

Engine Fuel Pump Hose . . . . . . . . . . . . . . .

Replace Engine Fuel Pump to

Secondary Fuel Filter Hose . . . ...00.. .

Replace Secondary Filter to Left

Cylinder Head Fuel Hose . . . . . . . . . . . . . .

Page Tas k Page

6-101 Replace Left to Right Engine

Cylinder Head Fuel Hose . . . . . . . . . . . . . . 6–11O

6-102 Replace Engine Air Inlet Elbow to

Air Box Heater Hoses . . . . . . . . . . . . . . . ...6-112

6-104 Replace Air Box Heater to Fuel

Return Tee Tube and Hose . . . . . . . . . . . 6–115

6-106 Replace Left Cylinder Head Fuel

Return Tube and Hose . . . . . . . . . . . . . . ...6-118

6-108

ENGINE FUEL SYSTEM DIAGRA M

6-101
TM 9-2350-261-20-1

REPLACE BULKHEAD CONNECTION TO PRIMARY FUEL FILTE R

HOS E

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Personnel Required:

Unit Mechanic

References:

See your –10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29)

REMOVE

WARNIN G

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOT E

Use wiping rag to wipe up any spilled fuel.

1. Disconnect supply hose quick disconnect

coupling (1).

2. Disconnect fuel supply hose (2) from adapter

(3) and elbow (4).

3. Remove adapter (3) from quick disconnect

coupling (1).

4. Remove elbow (4) from

INSTALL

5.

6.

7.

Apply a thin even coat

primary fuel filter (5).

of sealing compound

to cleaned external threads of hose ends and

fittings.

Install elbow (4) in primary fuel filter (5).

Install adapter (3) in quick disconnect

coupling (1) .

8. Connect fuel supply hose (2) to elbow (4) and

adapter (3).

9. Connect quick disconnect coupling (1).

6-102
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13–2). 4.

2. Start engine (see your -10). Check for leaks. 50

3. Raise and lock ramp (see your -10).

Stop/shutdown engine (see your -10).

Install power plant rear access panel

(page 24-27 or 24-29).

END OF TASK

6-103
TM 9-2350-261-20-1

REPLACE PRIMARY FUEL FILTER TO ENGINE FUEL PUM P

HOS E

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing Compound (Item 46, App C)

Wiping rag (Item 61, App C)

Personnel Required:

Unit Mechanic

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29)

REMOVE

1.

2.

WARNIN G

Fuel flowing over a metal 3.

surface causes static

electricity. This will cause a 4.

spark unless the surface is

grounded.

5.

Disconnect fuel supply hose (2) from

elbow (3).

Remove elbow (3) from primary fuel falter (4).

Disconnect fuel supply hose (2) from

elbow (5).

Remove elbow (5) from engine fuel pump (6).

NOT E

Use wiping rag to wipe up any spilled fuel.

Disconnect supply and return quick disconnect

couplings (1). 

6-104
TM 9-2350-261-20-1

INSTALL

6.

7.

8.

9.

10.

11.

Apply a thin even coat of sealing compound

to cleaned external threads of hose ends and

fittings.

Install elbow (1) in engine fuel pump (2).

Connect fuel supply hose (3) to elbow (1).

Install elbow (4) in primary fuel filter (5).

Connect supply hose (3) to elbow (4).

Connect supply and return quick disconnect

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Stop/shutdown engine (see your -10).

2. Start engine (see your -10). Check for leaks. 5. Install power plant rear access panel

(page 24-27 or 24-29).

3. Raise and lock ramp (see your -10).

END OF TASK

6-105

couplings (6).
TM 9-2350-261-20-1

REPLACE ENGINE FUEL PUMP TO SECONDARY FUEL FILTE R

HOS E

DESCRIPTION

This task covers: Remove (page 6-106). Install (page 6-107).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 49, App C)

Wiping rag (Item 61, App C)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Ramp lowered (see your -10)

Engine stopped/shutdown (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29)

REMOVE

WARNIN G

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOT E

Use wiping rag to wipe up any spilled fuel.

1. Disconnect supply and return

couplings (1) .

2.

3.

4.

5.

Disconnect fuel supply hose (2) from

elbow (3).

Remove elbow (3) from secondary fuel

falter (4).

Disconnect fuel supply hose (2) from

elbow (5).

Remove elbow (5) from fuel pump (6).

quick-disconnect

6-106
6.

7.

Apply a thin, even coat of sealing compound

to cleaned external threads of hose ends and

fittings.

Install elbow (1) in engine fuel pump (2).

8.

9.

10.

11.

TM 9-2350-261-20-1

Connect fuel supply hose (3) to elbow (1).

Install elbow (4) in secondary fuel filter (5).

Connect fuel supply hose (3) to elbow (4).

Connect supply and return quick-disconnect

couplings (6).

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Raise and lock ramp (see YOUr -10).

2. Start engine (see your -10). Check for leaks. 5. Stop/shutdown engine (see your –10).

3. Install power plant rear access panel

(page 24-27 or 24-29).

.

END OF TASK

6-107

INSTALL
TM 9-2350-261-20-1

REPLACE SECONDARY FILTER TO LEFT CYLINDER HEA D

FUEL HOS E

DESCRIPTIO N

This task covers: Remove (page 6-108). Install (page 6-109).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Personnel Required:

Unit Mechanic

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29)

Ramp lowered (see your -10)

REMOVE

WARNIN G

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOT E

Use wiping rag to wipe up any spilled fuel.

1. Separate quick-disconnect coupling (1).

6-108

2.

3.

4.

5.

6.

Disconnect fuel supply hose (2) from secondary fuel filter (3).

Disconnect fuel supply hoses (2 and 4) from

tee (5).

Remove tee (5) from nipple (6).

Remove nipple (6)

Remove elbow (7)

from elbow (7).

from engine left cylinder

head.
7.

8.

9.

10,

Apply a thin, even

to cleaned external

fittings.

Install elbow (1) in

coat of sealing compound

threads of hose ends and

engine left cylinder head.

Install nipple (2) in elbow (1).

Install tee (3) in nipple (2).

11.

12.

13.

TM 9-2350-261-20-1

Connect fuel supply hoses (4 and 5) to

tee (3).

Connect fuel supply hose (5) to secondary

fuel filter (6).

Connect quick-disconnect coupling (7).

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Stop/shutdown engine (see your –10).

2. Start engine (see your -10). Check for leaks. 5. Install power plant rear access panel

(page 24-27 or 24-29).

3. Raise and lock ramp (see your -10).

END OF TASK

6-109

INSTALL 
TM 9-2350-261-20-1

REPLAC E

HOS E

LEF T T O RIGHT ENGIN E CYLINDE R HEAD FUE L

DESCRIPTION

This task covers: Remove (page 6-110). Install (page 6-111).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Battery ground lead disconnected (page 13-2)

Carrier blocked (see your -10)

Power plant rear access panel removed

(page 24-27 or 24-29)

Ramp lowered (see your -10)

Trim vane lowered and power plant front

access door open (see your -10)

REMOVE 2. Disconnect fuel supply hose (2) from tee (3).

WARNIN G 3. Disconnect fuel supply hose (2) from

Fuel flowing over a metal eIbow (4).

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

4. Remove

5. Remove

NOT E

Use wiping rag to wipe up any spilled fuel.

1. Separate quick disconnect coupling (1).

elbow (4) from adapter (5).

adapter (5) from engine right cylinder

6-110

 head. 
TM 9-2350-261-20-1

INSTALL 8. Install elbow (2) in adapter (1).

6.

7.

Apply a thin, even coat of sealing compound 9. connect

to cleaned external threads of hose ends and

fittings. 10. Connect

Install adapter (1) in engine right cylinder 11. connect

head.

fuel supply hose

fuel supply hose

quick disconnect

(3) to elbow (2).

(3) to tee (4).

coupling (5).

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Raise and lock ramp (see your -10).

2. Start engine (me your -10). Check for leaks. 5. Stop/shutdown engine (see your -10).

3. Install power plant rear access panel 6. Close power plant front access door and raise

(page 24-27 or 24-29). trim vane (see your -10.

END OF TASK

6-111
TM 9-2350-261-20-1

REPLACE ENGINE AIR INLET ELBOW TO AIR BOX HEATE R

HOSE S

DESCRIPTION

This task covers: Remove (page 6-112). Install (page 6-113).

INITIAL SETUP

Tools:

General Mechanics Tool Kit

Materials/Parts:

Sealing compound (Item 46,

Personnel Required:

Unit Mechanic

References:

(Item 30, App D) see your -lo

Equipment Conditions:

App C) Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered and power plant front

access door open (see your -10)

1.

2

3

4

Remove hose (1) with adapter (2) from

tee (3). If hose is damaged, cut hose from

adapter.

Remove plug (4) from tee (3).

Remove tee (3) from nipple (5).

Remove nipple (5) from engine air inlet

elbow (6).

6-112 
5.

6.

7.

8.

9.

10.

Remove adapter (1) from air pump (2). If

hose is damaged, cut hose from adapter.

Disconnect check valve (3) from air hoses

(4 and 5).

Disconnect air hose (4) with adapter (6)

from elbow (7).

Remove strap (8) that secures fuel, air, and

electrical lines together.

Remove adapter (9) with hose (5) from

elbow (10).

Remove elbow (10) from air box heater (11).

INSTALL

11. Apply a thin even coat of sealing compound

to cleaned external threads of hoses and

fittings.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

TM 9-2350-261-20-1

Install elbow (10) in air box heater (11).

Install adapter (9) with hose (5) in

elbow (10).

Connect adapter (6) with hose (4) in air

pump (2).

Connect hose (4) to elbow (7).

Connect check valve (3) to air hoses

(4 and 5).

Install adapter (1) with hose (12) in air

pump (2).

Install nipple (13) in engine air inlet

elbow (14).

Install tee (15) on nipple (13).

Install plug (16) in tee (15).

Install adapter (16) with hose (17) in

tee (15).

Secure fuel, air, and electrical lines together

with strap (8).

GO TO NEXT PAGE

6-113
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1. Start engine (see your -10). Check for leaks. 3. Close power plant front access door and raise

trim vane (see your -10).

2. Stop/shutdown engine (see your -10).

6-114

END OF TASK
TM 9-2350-261-20-1

REPLACE AIR BOX HEATER TO FUEL RETURN TEE TUBE AN D

HOS E

DESCRIPTIO N

This task covers: Remove (page 6-115). Install (page 6-116).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Personnel Required:

Unit Mechanic

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Equipment Conditions: (cont):

Carrier blocked (see your -10)

Trim vane lowered and power plant front

access door open (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29)

Driver’s power plant access panel removed

(page 24-25)

Air cleaner housing and element removed

(page 7-7)

Air cleaner hose removed (page 7-3)

Air control valve and guard removed

(page 7-11)

Differential oil falter bracket removed

(page 21-6)

REMOVE

WARNIN G

Fuel flowing over a metal

surface causes static

electriciTY. This will cause a

spark unless the surface is

grounded.

NOT E

Use wiping rag to wipe up any spilled fuel.

1. Disconnect supply and return quick disconnect

couplings (1).

GO TO NEXT PAGE

6-115
TM 9-2350-261-20-1

2.

3.

4.

5.

6.

7.

8.

9.

Disconnect fuel tube (1) from elbows

(2 and 3).

Remove screw (4) that secures wiring harness clamp (5) to bracket on engine block.

Fuel hose (6) is behind wiring harness.

Remove screw (7), washer (8), clamp (9),

and fuel hose (6) from engine block.

Remove screw (10), washer (11), clamp (12),

and fuel hose (6).

Disconnect fuel hose (6) from fuel return

tee (13).

Disconnect fuel hose (6) from elbow (14).

Remove elbow (14) from adapter (15).

Remove adapter (15) from solenoid (16).

INSTALL

10.

11.

12.

13.

14.

15.

16.

Apply a thin even coat of sealing compound

to cleaned external threads of hose, tube,

and fittings.

Install adapter (15) in solenoid (16).

Install elbow (14) in adapter (15).

Install elbow (2) in solenoid (16).

Connect fuel tube (1) to elbow (12).

Connect fuel hose (6) to elbow (14).

Feed fuel hose (6) behind wiring harness

and through clamp (5). Secure clamp (5) to

bracket on engine block with screw (4).

6-116
TM 9-2350-261-20-1

17. Install fuel hose (1) on engine block. Secure 19.

with screw (2), washer (3), and clamp (4).

20.

18. Install fuel hose (1) on engine block. Secure

with screw (5), washer (6), and clamp (7).

Connect fuel hose (1) to fuel return tee (8).

Connect supply and return quick disconnect

couplings (9) .

FOLLOW-THROUGH STEPS

1.

2.

3.

4.

5.

Install differential oil falter bracket 6.

(page 21-6).

7.

Install air control valve and guard

(page 7-11). 8.

Install air cleaner hose (page 7-3).

9.

Install air cleaner housing and element

(page 7-7).

10.

Connect battery ground lead (page 13-2).

Start engine (see your -10). Check for leaks.

Stop/shutdown engine (see your -10).

Install driver’s power plant access panel

(page 24-25).

Install power plant rear access panel

(page 24-27 or 24-29).

Close power plant front access door and

raise trim vane (see your -10).

END OF TASK

6-117
TM 9-2350-261-20-1

REPLACE LEFT CYLINDER HEAD FUEL RETURN TUBE AN D

HOS E

DESCRIPTION

This task covers: Remove (page 6-118). Install (page 6-119),

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Open End Box Wrench (Item 85, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Lockwasher (2)

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29).

REMOVE

WARNIN G

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOT E

Use wiping rag to wipe up any spilled fuel.

1.

2.

3.

4.

5.

Disconnect quick disconnect couplings (1).

Remove quick disconnect coupling half (1)

from fuel return hose (2).

Disconnect fuel return hose (2) from tee (3).

Disconnect tube (4) from tee (3) and elbow

(5). Use open end box wrench.

Remove elbow (5) from left cylinder head.

NOT E

If elbow (5) is damaged do steps 6, 7,

and 8.

6. Remove hoses (6 and 7) from tee (8).

7. Remove two screws (9), lockwashers (10),

washers (11), and clamps (12) from hose

(7). Discard Iockwashers.

6-118

8.

9.

10.

11.

Remove tee (8), nipple (13), and elbow (14)

from engine.

Remove hose (7) from elbow (15). Remove

elbow (15) and coupling (16) from engine.

Disconnect air box heater fuel hose (17)

from tee (3).

Remove nut (18), two washers (19), and tee

(3) from linkage bracket (20).
INSTALL

12.

13.

14.

15.

16,

Apply a thin even coat of sealing compound

to cleaned external threads of hose and

fittings.

Install tee (1) in linkage bracket (2). Secure

with two washers (3) and nut (4).

Connect air box heater fuel hose (5) to

tee (l).

Install elbow (6) in left cylinder head.

Install coupling (7) and elbow (8) in engine.

Connect hose (9) to elbow (8).

17.

18.

19.

20.

21.

22.

23.

TM 9-2350-261-20-1

Install elbow (10), nipple (11), and tee (12)

on engine.

Connect hoses (9) to tee (12).

Secure tube (9) with two clamps (14),

washers (15), new lockwashers (16), and

SCreWS (17) to engine.

Connect tube (13) to tee (1) and elbow (6).

Use open end wrench to tighten.

Connect fuel return hose (18) to tee (1).

Install quick disconnect coupling (19) in fuel

return hose (18).

Connect quick disconnect couplings (19).

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Stop/shutdown engine (see your -10).

2. Start engine (see your -10). Check for leaks. 5. Install power plant rear access panel

(page 24-27 or 24-29).

3. Raise and lock ramp (see your -10).

END OF TASK

6-119
TM 9-2350-261-20-1

Section VIII. FUEL SYSTEM COMPONENT S

TASK INDE X

Tas k Page

Replace Engine Fuel

Pump . . ........ . . . . . ... . . . . . . . . . . .. . 6-121

Replace Primary Fuel

Filter Assembly . . . . . . . . . . . . . . . . . . . . . . .. . 6-123

Replace Secondary Fuel

Filter Assembly . . . . . . . . . . . . . . . 6-125

Replace Fuel Filter Elements . . . . . . ...6-128

Replace Fuel Filter Mounting

Bracket . . . . . . . . . . 6-130

Tas k Page

Replace Air Box Heater

Ignition Coil . . . . . . . . . . . . . . . . . . . .. 6-132

Replace Air Box Heater

Air Pump . . . . . . . . . . . . . .. 6-133

Replace Air Pump Vanes . . . . . . . . . . . ...6-135

Replace Air Box Heater

Solenoid Valve . . . . . . . . . . . 6-136

Replace Air Box Heater . . . . . . . . . . . . . ...6-138

Replace Air Box Heater

Wiring Harness . . . . . . . . 6-140

6-120
TM 9-2350-261-20-1

REPLACE ENGINE FUEL PUM P

DESCRIPTION

This task covers: Remove (page 6-121). Install (page 6-122).

INITIAL SETUP

Tool:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

wiping rag (Item 61, App C

Gasket

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panels and support

removed (page 24-27 or 24-29)

REMOVE

WARNIN G

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

1.

NOT E

Use wiping rag to wipe up any spilled fuel.

Disconnect supply hose at quick disconnect

2.

3.

4.

5.

Disconnect primary fuel filter supply hose (2)

from elbow (3).

Disconnect secondary fuel filter supply hose

(4) from elbow (5).

Remove three screws (6), fuel pump (7),

gasket (8), and fork (9) from engine block.

Discard gasket.

Remove two eIbows (3 and 5) from pump (7).

coupling (1).

GO TO NEXT PAGE

6-121
TM 9-2350-261-20-1

INSTALL

6.

7.

8.

Apply sealing compound to cleaned external

threads of hoses and fittings.

Install two elbows (1 and 2) in fuel

pump (3).

Place fork (4) on pump drive shaft (5). Place

new gasket (6) and pump (3) on engine.

9.

10.

11.

12.

Secure pump (3) to engine with three

screws (7) .

Connect primary fuel filter supply hose (8)

to elbow (2).

Connect secondary fuel filter supply hose

to elbow (l).

Connect supply hose at quick disconnect

coupling (10) .

(9)

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Stop/shutdown engine (see your -10).

2. Start Engine (see your -10). Check for leaks. 5. Install power plant rear access panels and

support (page 24-27 or 24-29).

3. Raise and lock ramp (see your -10).

END OF TASK

6-122
TM 9-2350-261-20-1

REPLACE PRIMARY FUEL FILTER ASSEMBL Y

DESCRIPTION

This task covers: Remove (page 6-123). Install (page 6-124).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Suitable container

1 1/4 inch hose

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29)

REMOVE

WARNIN G

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOT E

Use wiping rag to wipe up any spilled fuel.

1. Disconnect supply hose at quick disconnect

coupling (1).

2.

3.

4.

 5. .

Place a two foot length of 1 1/4 inch hose or

other suitable bulk hose past the drive belts

and idlers. Then slip one end of the hose over

the drain cock. Run the other end of the hose

into a suitable container resting on the crew

compartment floor in order to catch the

drained fuel. Open drain valve (2) and

remove bleed plug (3) to drain filter.

Disconnect two fuel supply hoses (4 and 5)

from two elbows (6).

Remove two nuts (7), screws (8), and filter

assembly (9) from bracket (10).

Remove two elbows (6) from filter

assembly (9).

GO TO NEXT PAGE

Change 1 6-123
TM 9-2350-261-20-1

INSTALL

9.

6.

7.

8.

Install sealing compound to cleaned external

threads of fittings. 10.

Install two elbows (1) in filter assembly (2). 11.

Secure filter assembly (2) to bracket (3) with 

two screws (4) and nuts (5). 12.

Connect two fuel supply hoses (6 and 7) to

two elbows (1).

Close drain valve (8) and fill filter assembly

(2) with fuel.

Install bleed plug (9) in filter assembly (2).

Connect supply hose at quick disconnect

coupling (10).

.

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Raise and lock ramp (see your -10).

2. Start engine (see your -10). 5. Stop/shutdown engine (see your -10).

3. Check for leaks. Install power plant rear

access panel (page 24-27 or 24-29).

END OF TASK

6-124
TM 9-2350-261-20-1

REPLACE SECONDARY FUEL FILTER ASSEMBL Y

DESCRIPTION

This task covers: Remove (page 6-125). Install (page 6-126).

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Wiping rag (Item 61, App C)

Suitable container

1 1/4 inch hose

Personnel Required:

Unit Mechanic

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your –10)

Carrier blocked (see your –10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29)

REMOVE

WARNIN G

Fuel flowing over a metal

 surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

1.

2.

3.

4.

5.

6.

NOT E

Use wiping rag to wipe up any spilled fuel.

Disconnect quick disconnect coupling (l).

Place a two foot length of 1 1/4 inch hose or

other suitable bulk hose past the drive belts

and idlers. Then slip one end of the hose over

the drain cock. Run the other end of the hose

into a suitable container resting on the crew

compartment floor in order to catch the

drained fuel. Open drain valve (2) and

remove bleed plug (3) to drain filter.

Disconnect fuel supply hose (4) from

elbow (5).

Disconnect fuel supply hose (6) from secondary filter assembly (7).

Disconnect circuits 1A and 1B plug (8) from

generator field switch (9).

Remove field switch (9) from tee (10).

7.

8.

9.

10.

Remove elbow (5) from tee (10).

Remove tee (10) from adapter (11).

Remove adapter (11) from filter

assembly (7).

Remove two screws (12), nuts (13), and filter assembly (7) from bracket (14).

GO TO NEXT PAGE

Change 1 6-125
TM 9-2350-261-20-1

INSTALL

11.

12.

13.

14.

15.

16.

17.

18.

Apply sealing compound to cleaned external

threads of fittings.

Install adapter (1) in secondary filter

assembly (2).

Install tee (3) in adapter (1).

Install elbow (4) and generator field switch

(5) in tee (3).

Secure filter assembly (2) to bracket (6)

With two screws (7) and nuts (8).

Connect circuits 1A and 1B plug (9) to field

switch (5) .

Connect fuel supply hose (10) to elbow (4).

Connect fuel supply hose (11) to filter

assembly (2).

19. Close drain valve (12) and fill filter assembly (2) with fuel.

20. Install bleed plug (13) in filter assembly (2).

21. Connect quick disconnect coupling (14).

6-126
FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 4. Stop/shutdown engine (see your -10).

2. Start engine (see your -10). Check for leaks. 5. Install power plant rear access panel

(page 24-27 or 24-29).

3. Raise and lock ramp (see your -10).

END OF TASK

6-127

TM 9-2350-261-20-1
TM 9-2350-261-20-1

REPLACE FUEL FILTER ELEMENT S

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Part:

Fuel filter element

Fuel filter element

Gasket (2)

Gasket (2)

Suitable container

Personnel Required:

Unit Mechanic

References:

see your -lo

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Ramp lowered (see your -10)

Battery ground lead disconnected (page 13-2)

Power plant rear access panel removed (page

(page 24-27 or 24-29)

REMOVE

NOT E

Both primary and secondary filter elements are removed and installed in the

same way.

1.

2.

3.

4.

5.

6.

7.

Disconnect supply hose at quick disconnect

coupling (1) .

Place suitable size container under fuel filter

assembly to be drained.

Open drain valve (2) and loosen bleed plug

(3). Drain fuel filter assembly.

Close drain valve (2).

Remove screw (4) and gasket (5) from filter

head (6). Discard gasket.

Separate element container (7) and gasket

(8) from fuel filter head (6). Discard gasket.

Remove primary and secondary element (9)

from container (7).

INSTALL

8.

9.

10.

Install new fuel falter element (9) in

container (7).

Fill container (7) with fuel.

Install new gasket (8) in fuel filter head (6).

11.

12.

13.

Secure container (7) to fuel filter head (6)

with screw (4) and new gasket (5).

Tighten bleed plug (3) in fuel filter head (6).

Connect supply hose at quick disconnect coupling (1).

6-128
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1. connect battery ground lead (page 13-2).

2. Start engine (see your -10).

3. Check

access

for leaks. Install power plant rear

panel (page 24-27 or 24-29).

4. Raise and lock ramp (see your –10).

5. Stop engine (see your –10).

END OF TASK

6-127 
TM 9-2350-261-20-1

REPLACE FUEL FILTER MOUNTING BRACKE T

INITIAL SETUP

Tools

General Mechanics Tool Kit (Item 30, App D)

Torque Wrench (Item 96, App D)

Materials/Parts

Antiseize compound (Item 4, App C)

Lockwasher (4)

Personnel Required

Unit Mechanic

References

see your -lo

Equipment Condition

Engine stopped/shutdown (see YOUr -10)

Carrier blocked (see your -10)

Battery ground lead disconnected (pages 13-2)

Power plant rear access panel removed

(page 24-27 or 24-29)

Primary fuel falter assembly removed

(page 6-123)

Secondary fuel falter assembly removed

(page 6-125)

Generator mounting bracket removed (100

amp only) (page 9-31) or (200 amp only)

(page 9-34)

REMOVE

1. Remove four screws (1), Iockwashers (2), and

fuel filter mounting bracket (3) from engine.

Discard lockwashers.

NOT E

The 200 amp fuel filter mounting bracket

is different from the 100 amp fuel filter

mounting bracket

INSTALL

2.

3.

4.

Apply antiseize compound to threads of four

screws (1).

Secure bracket (3) to engine with four screws

(1) and new lockwashers (2).

Tighten four

(6&75 N.m )

Screws (1) to 50-55 lb-ft

torque. Use torque wrench.

6-130
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1. Install generator mounting bracket (100 amp 4. Connect battery ground lead (page 13-2).

only) (page 9-31) or 200 amp only)

(page 9-34). 5. Start engine. Check for leaks.

2. Install secondary fuel filter assembly 6. Raise and lock ramp (see your -10).

(page 6-125).

7. Stop/shutdown engine (see your -10).

3. Install primary fuel filter assembly

(page 6-123). 8. Install power plant rear access panel

(page 24-27 or 24-29).

END OF TASK

6-131
TM 9-2350-261-20-1

REPLACE AIR BOX HEATER IGNITION COI L

INITIAL SETUP

Tools: Equipment

General Mechanics Tool Kit (Item 30, App D) Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Personnel Required: Battery ground lead disconnected (page 13-2)

Unit Mechanic Trim vane lowered and power plant front

access door open (see your –10)

References:

See your -10

REMOVE

1. Disconnect circuit

high tension wire

406 and

(2) from

2. Remove

coil (3),

INSTALL

406A plug (1) and 3. Install ignition coil (3) and pad on mount (7).

ignition coil (3). Secure with retainer (6), washer (5), and

screw (4).

screw (4), washer (5), retainer (6),

and pad from mount (7). 4. Connect circuit 406 and

high tension wire (2) to

406A plug (1) and

coil (3).

FOLLOW-THROUGH STEPS

1. Close power plant front access door and raise

trim vane (see your -10).

2. Connect battery ground page 13-2).

6-132

END OF TASK

Conditions:

 lead
TM 9-2350-261-20-1

REPLACE AIR BOX HEATER AIR PUM P

DESCRIPTION

This task covers: Remove (page 6-133). Install (page 6-134).

INITIAL SETU P

Tools: References:

General Mechanics Tool Kit (Item 30, App D) see your -10

Materials/Parts: Equipment Conditions:

sealing compound (Item 46, App C) Engine stoppedshutdown (see your –10)

Carrier blocked (see your -10)

Personnel Required: Ramp lowered (see your -10)

Unit Mechanic Battery ground lead disconnected (page 13-2)

Trim vane lowered and power plant front

access door open (see your -10)

REMOV E

1. Remove two nuts (1), washers (2), and leads

(3 and 4) from air box heater air pump (5).

2. Remove adapter (6) from elbow (7).

3. Remove adapter (8) from elbow (9).

4. Remove screw (10), washer (11)) retainer

(12), air pump (5), and pad from mount (13).

5. Remove elbow (7) from air pump (5).

6. Remove elbow (9) from air pump (5).

GO TO NEXT PAGE

6-133
TM 9-2350-261-20-1

INSTALL

7.

8.

9.

Apply sealing compound to cleaned external

threads of fittings.

Install elbows (1 and 2) in air pump (3).

Install air pump (3) and

Secure with retainer (5),

screw (7).

-

pad on mount (4).

10. Install adapters (8 and 9) on elbows

(1 and 2).

11. Secure leads (10 and 11) to air pump (3)

with two washers (12) and nuts (13).

washer (6), and

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 2. Close power plant front access door and raise

trim vane (see your -10).

END OF TASK

6-134

I
TM 9-2350-261-20-1

REPLACE AIR PUMP VANE S

INITIAL SETUP

Tools:

General Mechanics Tool Kit

Materials/Parts:

Vane kit

Personnel Required:

Unit Mechanic

References:

(Item 30, App D) See your -10

Equipment Conditions:

Air box heater pump removed (page 6-133)

REMOV E

1. Remove three screws (1) and

pump body (3).

2. Remove three vanes (4), hub

from pump shaft (7). Discard

INSTAL L

cover (2) from 4.

(5) and key (6) 5.

vanes.

6.

Secure hub (5) to pump shaft (7) with

key (6).

Install three new vanes (4) in hub (5). Be

sure chamfered ends of vanes are against

pump body.

Secure cover (2) to pump body (3) with

screws (1).

FOLLOW-THROUGH STEPS

1. Install air box heater pump on engine (page 6-133).

END OF TASK

6-135
TM 9-2350-261-20-1

REPLACE AIR BOX HEATER SOLENOID VALV E

DESCRIPTION

This task covers: Remove (page 6-136). Install (page 6-137).

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions:

Sealing compound (Item 46, App C) Engine stopped/shutdown (see your -10)

Wiping rag (Item 61, App C) Battery ground lead disconnected (page 13-2)

Lockwasher (4) Carrier blocked (see your -10)

Trim vane lowered and power plant front

Personnel Required: access door open (see your -10)

Unit Mechanic

REMOVE 1. Separate fuel return hose quick-disconnect

coupling (1).

WARNIN G

Fuel flowing over a metal

surface causes static

electricity. This will cause a

spark unless the surface is

grounded.

NOT E

Use wiping rag to wipe up any spilled fuel.

6-136
TM 9-2350-261-20-1

2.

3.

4.

5.

6.

7.

8.

9.

Disconnect fuel tube (1) from two elbows

(2 and 3).

Disconnect electrical lead (4) from solenoid

valve (5).

Disconnect fuel hose (6) from elbow (7).

Remove two screws (8), lockwashers (9), flat

washers (10), bracket (11), and solenoid valve

(5) from engine. Discard lockwashers.

Remove two screws (12), lockwashers (13),

and solenoid valve (5) from bracket (11).

Discard lockwashers.

Remove elbow (7) from adapter (14).

Remove adapter (14) from solenoid valve (5).

Remove elbow (3) from solenoid valve (5).

INSTALL

10.

11.

12.

13.

14.

15.

16.

17.

18.

Apply sealing compound to cleaned external

threads of fittings.

Install elbow (3) in solenoid valve (5).

Install adapter (14) and elbow (7) in

solenoid valve (5).

Secure solenoid valve (5) to bracket (11)

with two new lockwashers (13) and screws

(12).

Install bracket (11) and solenoid valve (5)

on engine. Secure with two flat washers

(10), new lockwashers (9), and screws (8).

Connect fuel hose

Connect electrical

valve (5).

Connect fuel tube

(6) to elbow (7).

lead (4) to solenoid

(1) to two

elbows (2 and 3).

Connect fuel return hose quick-disconnect

coupling (15) .

FOLLOW-THROUGH STEPS

1. Connect battery ground lead (page 13-2). 2. Close power plant front access door and raise

trim vane (see your -10).

END OF TASK

6-137
TM 9-2350-261-20-1

REPLACE AIR BOX HEATE R

DESCRIPTION

This task covers: Remove (page 6-138). Install (page 6–139).

INITIAL SETUP

Tools:

General Mechanics

Materials/Parts:

References:

Tool Kit (Item 30, App D) See your -10

Equipment Conditions:

Sealing compound (Item 46, App C) Engine stopped/shutdown (see your -10)

Gasket Battery ground lead disconnected (page 13-2)

Preformed packing Carrier blocked (see your -10)

Air box heater solenoid valve removed

Personnel Required: (page 6-136)

Unit Mechanic Trim vane lowered and power plant front

access door open (see your -10)

REMOVE 4.

1. Disconnect lead (1) from igniter (2).

2. Disconnect air hose (3) from elbow (4).

5.

3. Remove elbow (4) from adapter (5).

6.

Remove three screws (6) and washers (7) .

that secure air box heater body (8) to engine.

Three leads (9) will come off with one

screw (6).

Remove heater body (8), packing (10), and

gasket (11) from engine. Discard packing and

gasket.

Remove elbow (12), spray nozzle (13), and

adapter (5) from heater body (8).

6-138
INSTALL

7.

8.

9.

Apply sealing compound to cleaned external

threads of fittings.

Install spray nozzle (1), elbow (2), and

adapter (3) on air box heater body (4).

Place new gasket (5), new packing (6), and

heater body (4) on engine.

10.

11.

12.

13.

Install heater body (4)

three ground leads (7)

TM 9-2350-261-20-1

on engine and attach

to heater body.

Secure- with three washers (8) and

screws (9).

Install elbow (10) in adapter (3).

Connect air hose (11) to elbow (10).

Connect lead (12) to igniter (13).

FOLLOW-THROUGH STEPS

1. Install air box heater solenoid valve 3. Close power plant front access door and raise

(page 6-136). trim vane (see your -10).

2. Connect battery ground lead (page 13-2).

END OF TASK

6-139
TM 9-2350-261-20-1

REPLACE AIR BOX HEATER WIRING HARNES S

DESCRIPTION

This task covers: Remove (Page 6-140). Install (Page 6-141).

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions:

Sealing tape (Item 56, App C) Engine stopped/shutdown (see your -10)

Battery ground lead disconnected (page 13-2)

Personnel Required: Carrier blocked (see your -10)

Unit Mechanic Trim vane lowered and power plant front

access door open (see your -10)

1.

2.

3.

Disconnect air box heater wiring harness connector (1) from power plant wiring harness

receptacle (2).

Disconnect wiring harness connector (3) from

coil (4).

Remove two nuts (5), washers (6), and two

wiring harness leads (7) from air pump (8).

4.

5.

6.

Disconnect wiring harness connector (9) from

fuel control solenoid (10).

Remove screw (11), washer (12), and three

ground leads (13) from air box heater (14).

Remove strap (15), sealing tape (16), air box

heater wiring harness (17) from power plant

compartment.

6-140
TM 9-2350-261-20-1

INSTALL

7.

8.

9.

Secure three ground leads (1) to air box

er (2) with washer (3) and screw (4).

Connect wiring harness connector (5) to

control solenoid (6).

10.

heat11.

fuel

12.

Secure two wiring harness leads (7) to air

pump (8) with two washers (9) and

nuts (10). 13.

Connect wiring harness connector (11) to

coil (12).

Connect air box heater wiring harness connector (13) to power plant wiring harness

receptacle (14).

Secure air box heater wiring harness (15) to

air box heater hose with strap (16).

Use sealing tape (17) to secure air box heater wiring harness (15) to air box heater

hose (18).

FOLLOW-THROUGH STEPS

1. Close power plant front access door and raise 2. Connect battery ground lead (page 13-2).

trim vane (see your -10).

END OF TASK

6-141 (6-142 blank)
TM 9-2350-261-20-1

CHAPTER 7

AIR INDUCTION AND EXHAUST SYSTEM MAINTENANC E

Section I. AIR INDUCTION SYSTE M

TASK INDE X

Tas k

Service Air Cleaner

Replace Air Cleaner

Replace Air Cleaner

Replace Air Cleaner

Page Tas k

Element . . . . . . . . . . ...7-2 Replace Air Cleaner

Indicator and Hose

Hoses . . . . . . . . . . . . ...7-3

Page

Restriction

. . . ....... . . . . . . ... . . 7-9

Cover . . . . . ........7-5

Repair Air Control Valve . . . . . . . . . . . . . ...7-11

Housing . . . . . . . . . ...7-7

Replace Air Control Valve Cable . . . . ...7-13

7-1
TM 9-2350-261-20-1

SERVICE AIR CLEANER ELEMEN T

INITIAL SETUP

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Air Blow Gun (Item 33, App D)

Equipment Conditions:

Material/Parts: Engine stopped/shutdown (see your -10)

General purpose detergent (Item 17, App C) Carrier blocked (see your -10)

Suitable container (5 Gal) Air cleaner element removed (see your -10)

Personnel Required:

Unit Mechanic

SERVICE

NOT E

Cleaning element may be cleaned by either or both of the following methods.

1. Using air blow gun, blow out element with

30 psi maximum compressed air from inside

to outside of element (in direction opposite to

normal air flow).

2.

WARNIN G

After suspected NBC exposure of this earner, all air

cleaner media shall be

handled only by personnel

wearing full NBC

protective equipment.

WARNIN G

Air pressure in excess of

30 psi (207 kpa) can injure

personnel. Do not direct

pressurized air at youself

or others. Always wear goggles.

Wash element in solution of nonsudsing or

low sudsing detergent and water or soap and

water. Do not use gasoline or solvents for

cleaning.

a.

b.

c.

d.

e.

f.

Prepare solution of 1 cup of dry detergent

to 5 gallons of water in a container large

enough to completely submerge the element. The temperature of the solution

should not exceed 190°F. Make solution

stronger if element is extremely dirty.

Immerse element completely in the washing solution. Agitate element gently for

2 minutes.

Allow element to soak in solution for a

minimum of 15 minutes. Agitate element

gently for an additional 3 to 5 minutes.

Remove element from solution and allow

to drain.

Rinse element with cold water from a

hose with a maximum 30 psi water pressure from inside to outside of element.

Continue rinsing until water runs clear

and detergent or soap residue is removed

from element.

Allow element to air dry thoroughly.

FOLLOW-THROUGH STEPS

1. Install air cleaner element (see your -10).

END OF TASK

7-2
TM 9-2350-261-20-1

REPLACE AIR CLEANER HOSES

DESCRIPTION

This task covers: Remove (page 7-3). Install (page 7-4).

INITIAL SETUP

Tools Equipment Conditions:

General Mechanics Tool Kit (Item 30, App D) Engine stoppedshutdown (see your -10)

Carrier blocked (see you -10)

Personnel Required: Trim vane lowered (see your -10)

Unit Mechanic Power plant front access door open

(see your -10)

Driver’s power plant access panel removed

(page 24-25)

REMOVE

1.

2.

3.

Remove air cleaner housing and element from

air cleaner cover (page 7-7).

Remove two clamps (1) and outlet hose (2)

from air cleaner cover (3) and engine air

inlet (4).

Remove two clamps (5) and inlet hose (6)

from air cleaner cover (3) and air control

housing (7) .

GO TO NEXT PAGE

7-3
TM 9-2350-261-20-1

INSTALL

4.

5.

6.

Secure outlet

and air inlet

clamps (4).

hose (1) to air cleaner cover (2)

(3) on engine with two

Secure inlet hose (5) to air cleaner cover (2)

and air control housing (6) with two

clamps (7) .

Install air cleaner housing and element on

cover (page 7-7).

FOLLOW-THROUGH STEPS

1. Install driver’s power plant access panel

(page 24-25).

WARNIN G

Loose clothing is dangerous

around moving belts and

pulleys. You could get badly hurt if your clothes get

caught in moving parts.

2.

3.

4.

5.

Start engine (see your –10). Check air cleaner

for proper operation.

Stop/shutdown engine (see your -10).

Close power plant front access door

(see your -10).

Raise trim vane see your -10).

END OF TASK

7-4
TM 9-2350-261-20-1

REPLACE AIR CLEANER COVE R

INITIAL SETUP

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts

Sealing compound (Item 46, App C)

Personnel Required:

Unit Mechanic

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Driver’s power plant access panel removed

(page 24-25)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Carrier blocked (see your -10)

Air cleaner element and housing removed

(page 7-7)

Air cleaner hoses removed (page 7-3)

REMOVE

1.

2.

3.

Remove four screws (1), eight washers (2),

and air cleaner (3) from two brackets (4).

Disconnect air restriction indicator hose (5)

from adapter (6).

Remove adapter (6) and elbow (7) from air

cleaner cover (3).

INSTALL

4.

5.

6.

7.

Apply a thin coat of sealing compound to external threads of adapter (6) and elbow (7).

Install elbow (7) in air cleaner cover (3) and

adapter (6) in elbow.

Connect air restriction hose (5) to

adapter (6).

Place air cleaner cover (3) on two brackets

(4) and secure with four screws (1) and eight

washers (2).

GO TO NEXT PAGE

7-5
TM 9-2350-261-20-1

FOLLOW-THROUGH STEPS

1. Install air cleaner hoses (page 7–3). 4.

2. Install air cleaner element and housing

(page 7-7).

3. Install driver’s

(page 24-25).

5.

power plant access panel 6.

WARNING 7.

Loose clothing is dangerous

around moving belts and

pulleys. You could get badly hurt if your clothes get

caught in moving parts.

Start engine (see your

for proper operation.

Stop/shutdown engine

-10). Check air cleaner

(see your -10).

Close power plant front access door

(see your –10).

Raise trim vane (see your –10).

END OF TASK

7-6
TM 9-2350-261-20-1

REPLACE AIR CLEANER HOUSING

DESCRIPTION

This task covers: Remove (page 7-7). Install (page 7-8).

INITIAL SETUP

Tools: Equipment Conditions:

General Mechanics Tool Kit (Item 30, App D)

Personnel Required:

Unit Mechanic

References:

See your -10

REMOVE

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Driver’s power plant access panel removed

(page 24-25)

1.

2.

NOTE

You will have one of two air cleaner

configurations. Body and elements are

not interchangeable except as sets.

Release four latches (1), remove housing (2)

and element (3) from cover (4).

Remove element (3) from housing (2).

GO TO NEXT PAGE

Change 4 7-7
TM 9-2350-261-20-1

INSTALL

3. Install air cleaner element (1) in housing (2)

and turn element until slot on bottom is

between stops in housing.

NOTE

Drain hole in housing (2) must be positioned as shown to align latches.

4. Secure housing (2) to cover (3) with four

latches (4).

FOLLOW-THROUGH STEPS

1. Install driver’s power plant access panel

(page 24-25).

WARNING

Loose clothing is dangerous

around moving belts and

pulleys. You could get badly hurt if your clothes get

caught in moving parts.

2.

3.

4.

5.

Start engine (see your -10). Check air cleaner

for proper operation.

Stop/shutdown engine (see your -10).

Close power plant front access door

(see your -10).

Raise trim vane (see your -10).

END OF TASK

7-8 Change 4
TM 9-2350-261-20-1

REPLACE AIR CLEANER RESTRICTION INDICATOR AND HOS E

DESCRIPTION 

This task covers: Remove (page 7-9). Install (page 7-10).

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Sealing compound (Item 46, App C)

Self-locking nut (2)

Personnel Required:

Unit Mechanic

Helper (H)

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your –10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -lo)

Carrier blocked (see your -10)

Air cleaner element and housing removed

(page 7-7)

Air cleaner hoses removed (page 7-3)

Air cleaner cover removed (page 7-5)

Driver’s power plant access panel removed

(page 24-25)

REMOVE

1.

2.

Disconnect air restriction indicator hose (1)

from adapter (2), and remove adapter from

indicator (3).

Remove two locknuts (4), washers (5), screws

(6) and indicator (3) from bulkhead. Discard

locknuts.

GO TO NEXT PAGE

7-9
TM 9-2350-261-20-1

INSTAL L

3.

4.

5.

6.

7.

8.

9.

10.

Secure indicator (1) to bulkhead with two

screws (2), washers (3), and new

locknuts (4) .

Apply a thin coat of sealing compound to

threads of adapter (5).

Install adapter (5) in indicator (1).

Connect indicator hose (6) to adapter (5).

Install air cleaner cover (page 7-5).

Install air cleaner housing and element

(page 7-7).

Install air cleaner inlet hose (page 7-3).

Install driver’s power plant access panel

(page 24-25).

WARNING

Loose clothing is dangerous

around moving belts and

pulleys. You could get badly hurt if your clothes get

caught in moving parts.

11. Start engine and set at 800 rpm

(see your -10).

12.

13.

14.

15.

 Block air cleaner outlet opening with a piece

of cardboard. Check window in indicator. It

should be red.

Turn engine off, and remove cardboard.

Indicator should remain red.

Press reset button on indicator. Window

should turn green.

If indicator does not operate properly,

replace it.

FOLLOW-THROUGH STEPS

1. Engine stopped/shutdown (see your -10). 3. Close power plant front access door

‘(see your -10).

2. Install air cleaner outlet hose (page 7-3).

4. Raise trim vane (see your -10).

END OF TASK

7-10
TM 9-2350-261-20-1

REPAIR AIR CONTROL VALV E

DESCRIPTION

This task covers: Remove (page 7-11). Install (page 7-12).

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Gasket

Cotter pin

Self-locking nut (3)

Self-locking nut

Personnel Required:

Unit Mechanic

Helper (H)

References:

see your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Driver’s power plant access panel removed

(page 24-25)

Air cleaner hose removed (page 7-3)

Air cleaner element and housing removed

(page 7-7)

REMOVE 7. Remove two screws (26), washers (27),

1.

2.

3.

4.

5.

6.

Remove five screws (l), washers (2), plate

(3), and two spacers (4) from driver’s

compartment bulkhead.

Remove two screws (5), washer (6), two

clamps (7) and cable (8) from weldnut (9)

and locknut (10). Discard locknut.

NOT E

Support air control valve housing (13) at

this point to prevent its hanging by

control cable. Have helper assist.

Remove three screws (11), washers (12),

housing (13), gasket (14), and screen (15)

from driver’s compartment bulkhead. Discard

gasket.

Remove two setscrews (16) and collars (17)

to separate cable (8) from pin (18).

Remove two screws (19), washers (20), nuts

(21), baffle (22), and hinge (23) from

housing (13).

.

Remove cotter pin (24), washer (25), and pin

(18) from baffle (22). Discard cotter pin.

locknuts (28), and hinge (23) from

baffle (22). Discard locknuts.

GO TO NEXT PAGE

7-11
TM 9-2350-261-20-1

8. Remove locknut (1),

three cables (4) and

housing (6). Discard

INSTAL L

9.

10.

11.

12.

13.

14.

15.

16.

screw (2), clamp

bracket (5) from

locknut.

Install bracket (5) and three cables (4) on

(3),

housing (6). Secure with clamp (3), screw

(2), and new locknut (1).

Secure pin (7) to baffle (8) with new cotter

pin (9) and washer (10).

Secure hinge (11) to baffle (8) with two

screws (12), washers (13), and new

locknuts (14) .

Install baffle (8) and hinge (11) in housing

(6). Secure with two screws (15), washers

(16), and nuts (17).

With cable in full forward position and baffle

in down position, support housing (6) and

secure cable (18) to pin (7) with two collars

(19) and setscrews (20).

Secure cable (18) and two clamps (21) to

weldnut (22) with washer (23), screw (25),

and new locknut (24).

Secure housing (6), new gasket (26), and

screen (27) to driver’s compartment bulkhead

with three screws (28) and washers (29).

Secure plate (30), housing (6), and new

gasket (26) to driver’s compartment

bulkhead with five screws (31), washers

(32), and two spacers (33).

FOLLOW-THROUGH STEPS

1.

2.

3.

Install air cleaner

Install air cleaner

(page 7-7).

hose (page 7-3). 4.

element and housing

5.

Install driver’s power plant access panel 6.

(page 24-25).

7.

Close power plant from access panel door

(see your -10).

Raise trim vane (see your -10).

Start engine (see your -10). Check air control

valve for proper operation.

Engine stopped/shutdown (see your -10).

END OF TASK

7-12
TM 9-2350-261-20-1

REPLACE AIR CONTROL VALVE CABLE

INITIAL SETU P

Tools:

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts:

Self-locking nut

Personnel Required:

Unit Mechanic

Helper (H)

References:

See your -10

Equipment Conditions:

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your –10)

Power plant front access door open

(see your -10)

Air control valve removed (page 7-11)

1.

2.

3.

4.

5.

Remove

(3) that

Remove

Remove

(8), and

weldnut

Remove

Remove

NOT E

Have helper ask.

screw (1), clamp (2), and washer

secure cable (4) to weldnut (5).

clamp (2) from cable (4).

two screws (6), washer (7), locknut

two clamps (9) from cable (4), and

(10). Discard locknut.

nut (11) from cable (4).

cable (4) through opening in driver’s

compartment bulkhead below throttle and

fuel cutoff controls.

INSTAL L

NOT E

6.

7.

8.

9.

10.

Have helper assist

Install cable (4) through opening in driver’s

compartment bulkhead below the throttle

and fuel cutoff controls.

Secure cable (4) to bulkhead with nut (11).

Secure two clamps (9) to cable (4) with two

screws (6), washer (7), new locknut (8), and

weldnut (10).

Install clamp (2) on cable (4).

Secure clamp (2) to weldnut (5) with screw

(1) and washer (3).

GO TO NEXT PAGE

7-13

REMOV E
TM 9-2350-261-20-1

FOLLOW-THROUGH STEP S

1. Install air control valve (page 7-11). 2. Close power plant front access door

(see your -10).

3. Raise trim vane (see your –10).

END OF TASK

7-14
TM 9-2350-261-20-1

Section II. ENGINE EXHAUST SYSTE M

TASK INDE X

Task Page Task

Replace Exhaust Pipes . . . . . . . . . . . . . . . . . . .7-16

Replace Muffler Extension And

Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-18

Page

Replace Muffler And Brackets . . . . . . . . . . 7–20

7-15
TM 9-2350-261-20-1 

REPLACE EXHAUST PIPE S

DESCRIPTION

This task covers: Remove (page 7-16). Install (page 7-17).

INITIAL SETUP 

Tools:

General Mechanics Tool Kit (Item 30, App D)

Socket Wrench Set (Item 88, App D)

Socket Wrench Set (Item 89, App D)

Torque Wrench (Item 95, App D)

Torque Wrench (Item 99, App D)

Personnel Required: 

Unit Mechanic

References:

see your -10

Equipment Conditions: 

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered (see your -10)

Power plant front access door open

(see your -10)

Air cleaner housing and element removed

(page 7-7)

REMOV E

1.

WARNIN G

Do not touch hot exhaust

pipes with bare hands. you

could get a bad burn.

NOT E

Muffler clamps are used on early exhaust

system only. If muffler clamp has to be

replaced, new exhaust pipes will need to

be ordered.

Step 1 is for the early system. Step 2 is for

the current system.

Loosen two manifold clamps (1) and two

muffler joint clamps (2).

2.

3.

4.

Loosen two manifold clamps (1).

Remove exhaust pipes (3 and 4) from engine

manifolds (5 and 6) and muffler joint (7).

Separate exhaust pipe (3) from exhaust

pipe (4).

7-16
INSTALL

5.

7.

Install exhaust pipe (1) in exhaust pipe (2).

NOT E

Step 6 is for the early system. Step 7 is for

the current system.

Install and secure exhaust pipes (1 and 2) on

engine exhaust manifolds (3 and 4) and

muffler joint (5) with two muffler joint

clamps (6).

Install exhaust pipe (1) on muffler joint (5).

Install and secure exhaust pipes (1 and 2) on

engine exhaust manifolds (3 and 4) with two

clamps (7) .

8.

9.

TM 9-2350-261-20-1 

Tighten two clamps (7) to 204-216 lb-in

(23-25 N•m) torque. Use torque wrench

(Item 95) and socket wrench set (Item 89).

NOT E

Step 9 is for early system only.

Tighten two muffler clamps (6) to

36-60 lb-in (4-7 N•m) torque. Use torque

wrench (Item 99) and socket wrench set

(Item 88).

FOLLOW-THROUGH STEPS 

1. Install air cleaner housing and element

(page 7-7).

WARNIN G

Loose clothing is dangerous

around moving belts and

pulleys. You could get badly hurt if your clothes get

caught in moving parts.

2.

3.

4.

5.

Start engine (see your -10). Check for leaks.

Engine stopped/shutdown (see you -10).

Close power plant front access door

see your -10.

Raise trim vane (see your -10).

END OF TASK

7-17

6. 
TM 9-2350-261-20-1 

REPLACE MUFFLER EXTENSION AND VALV E

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions: 

Cotter pin Carrier blocked (see your -10)

Key washer (4) Engine stopped/shutdown (see your -10)

Power plant front access door open

Personnel Required: (see your -10)

Unit Mechanic Trim vane lowered (see your -10)

REMOVE

1.

2.

3.

WARNIN G

Hot exhaust pipes can bum

you. Let power unit cool

before you start work.

Remove four screws (1) and key washers (2).

Lift out exhaust extension (3) from adapter

plate (4). Discard washers.

Remove four screws (5) and adapter plate (4)

from exhaust grill (6).

Remove cotter pin (7), pin (8), and valve (9)

INSTALL

4.

5.

6.

7.

Install valve (9) on exhaust extension (3). Secure with pin (8) and new cotter pin (7).

Install adapter plate (4) on exhaust grill (6).

Secure with four screws (5).

Install exhaust extension (3) through adapter

plate (4) on muffler inside carrier.

Secure exhaust extension (3) to adapter plate

(4) and grill (5) with four new key

washers (2) and screws (1).

from exhaust extension-

(3). Discard cotter

7-18
TM 9-2350-261-20-1 

REPLACE MUFFLER EXTENSION AND VALV E

INITIAL SETUP 

Tools: References:

General Mechanics Tool Kit (Item 30, App D) See your -10

Materials/Parts: Equipment Conditions: 

Cotter pin Carrier blocked (see your -10)

Key washer (4) Engine stopped/shutdown (see your -10)

Power plant front access door open

Personnel Required: (see your -10)

Unit Mechanic Trim vane lowered (see your -10)

REMOVE

1.

2.

3.

WARNIN G

Hot exhaust pipes can bum

you. Let power unit cool

before you start work.

Remove four screws (1) and key washers (2).

Lift out exhaust extension (3) from adapter

plate (4). Discard washers.

Remove four screws (5) and adapter plate (4)

from exhaust grill (6).

Remove cotter pin (7), pin (8), and valve (9)

INSTALL

4.

5.

6.

7.

Install valve (9) on exhaust extension (3). Secure with pin (8) and new cotter pin (7).

Install adapter plate (4) on exhaust grill (6).

Secure with four screws (5).

Install exhaust extension (3) through adapter

plate (4) on muffler inside carrier.

Secure exhaust extension (3) to adapter plate

(4) and grill (5) with four new key

washers (2) and screws (1).

from exhaust extension-

(3). Discard cotter

7-18
TM 9-2350-261-20-1 

REPLACE MUFFLER AND BRACKET S

DESCRIPTION

This task covers: Remove (page 7-20). Install (page 7-21).

INITIAL SETUP 

Tools

General Mechanics Tool Kit (Item 30, App D)

Materials/Parts

Lockwasher (2)

Cotter pin

Self-locking nut (2)

Personnel Required 

Unit Mechanic

References

see your -10

Equipment Conditions

Engine stopped/shutdown (see your -10)

Carrier blocked (see your -10)

Trim vane lowered and power plant front

access door open (see your -10)

Power plant rear access panel removed

(page 24-27 or 24-29)

REMOVE 3.

WARNIN G

If you work on a carrier

that has been running, you 4.

could be burned. All tasks

begin with a cooled down

carrier. Allow carrier to 5.

cool, or use care if you work

on a hot carrier.

1.

2.

Lift exhaust extension up until it clears the

muffler (page 7-18).

Loosen two clamps (1) and remove pipe (2)

from muffler (3) and manifold.

Remove two screws (4), two washers (5), two

lockwashers (6), and front bracket (7) from

plate (8). Discard lockwashers.

Remove cotter pin (9), pin (10), and muffler

(3) from front bracket (7). Discard cotter pin.

Remove two locknuts (11), four washers (12),

two screws (13), and muffler (3) from rear

bracket (14). Discard locknuts.

7-20
INSTALL 9.

6.

7.

8.

Secure rear of muffler (1) to bracket (2) with

two screws (3), four washers (4), and two 10.

new locknuts (5).

Secure front of muffler (1) to front bracket

(6), with pin (7) and new cotter pin (8).

Secure front bracket (6) to plate (9) with two

new lockwasher (10) two washers (11) and

two screws (12).

TM 9-2350-261-20-1 

Secure pipe (13) to muffler (1) and manifold

with two clamps (14).

Lower exhaust extension into muffler

(page 7-18).

FOLLOW-THROUGH STEPS 

1. Start engine (see your -10). Check for leaks. 3. Install power plant rear access panel

(page 24-27 or 24-29).

2. Stop/shutdown engine (see your -10).

4. Close power plant front access door and raise

trim vane (see your -10).

END OF TASK

7-21 (7-22 blank)
TM 9-2350-261-20-1

Subject, Page

A

ALPHABETICAL INDEX

Subject, Page

Accelerator:

Linkage:

Lower, transmission, repair, 23-29

Dower, transmission, replace, 23-25

Transmission throttle valve and, adjust,

23-34

Upper, repair, 23-33

Upper, replace, 23-31

Pedal, lower, replace, 23-22

Pedal assembly, upper, replace, 23-23

Access panel, power plant, driver’s, replace,

24-25

Access panels, power plant:

Rear, M577A2, M106A2, M125A2, M1068,

M1064, replace, 24-29

Rear, M1059, replace, 24-28.1

Rear, M113A2, M901A1, replace, 24-27

Adapter:

Drum, M113A2 M1059, 34-3

Gun mount assembly, replace, 38-5

Speedometer cable and, replace, 11-17

Tachometer cable and, replace, 11-14

Adapter access plate:

Cover assembly fog oil quick disconnect, to

hose, M1059, replace, 40-33

Fog oil tank quick disconnect to hose, M1059,

replace, 40-31

Smoke generator compressor reservoir to air

hose, M1059, replace, 40-29

Smoke generator control panel to electrical

cable assembly, M1059, replace, 40-16

Smoke generator, gasket, M1059, replace,

40-27

Smoke generator to cover assembly air hose,

M1059, replace, 40-30

To generator electrical cable assembly,

M1059, replace, 40-18

Adapters and the conversion formula, use of

torque wrench, 2-29

Admittance buzzer:

And switch, M577A2, M1068, replace, 12-72

Right rear utility outlet works improperly,

M577A2, 3-122

Air box:

Drain hoses, tubes, and fittings, replace, 4-9

A (cont)

Air box (cont):

Engine air inlet elbow to heater hoses, 6-112

Heater:

Air pump, replace, 6-133

Air pump vanes, replace, 6-135

Ignition coil, replace, 6-132

Replace, 6-138

Solenoid valve, replace, 6-136

To fuel return tee tube and hose, 6-115

Wiring harness, replace, 6-140

Air cleaner:

Cover, replace, 7-5

Element, service, 7-2

Hoses, replace, 7-3

Housing, replace, 7-7

Restriction indicator and hose, replace, 7-9

Air compressor:

Assembly, M1059, replace, 40-19

Electrical cable assembly, M1059, replace,

40-13

Air control valve:

Cable, replace, 7-13

Repair, 7-11

Air intake and exhaust pipes:

Air purifier:

And frame, M8A3/M14 NBC, M113A2,

replace, 39-93

And frame, M8A3/M13, M577A3, replace,

39-32

And frame, M8A3/M3 NBC, M106A2,

M125A2, replace, 39-46

And frame, M13, M1068, replace, 39-59

Personnel heater:

Replace, M106A2, M1064, M125A2, 29-55

Replace, all except M106A2, M125A2,

29-53

Air ventilator, rear compartment, replace,

24-117

 Alarm cable, M113A2, replace, 44-5

Allocation chart, maintenance, B-1

Ammunition:

Rack:

Horizontal, M125A2, 24-189

Horizontal, M1064, replace, 24-190.3

Horizontal, M1064, repair, 24-190.5

Change 4 Index 1
TM 9-2350-261-20-1

Subject, Page Subject, Page

A (cont)

Ammunition (cont):

Back (cont):

Assembly (cont):

Post:

Horizontal, M106A2, 24-191

Vertical, M125A2, M106A2, 24-188

Vertical, M1064, X-190.1

Stowage rack:

Repair, M113A2, 36-6

Replace, M113A2, 36-5

Regulator:

M901A1, replace, 24-266

Anchor, torsion bar, replace, 22-36

Antenna:

Covers, replace, 24-241

Guard, replace, 24-240

Mast bracket assembly (M1068 ONLY),

replace, 24-276

Appendix A (references), A-1

Appendix B (maintenance allocation chart), B-1

Appendix C (expendable/durable supplies and

materials list), C-1

Appendix D (common tools and supplements and

special tools/fixtures list), D-1

Appendix E (fabricated tools), E-1

Arm, idler wheel:

Replace, 22-23

Armor:

Shields:

100/200 amp, replace, 9-40

Switch, cables, M8A3/M14 NBC, M113A2,

M1059A2, replace, 39-95

Switch, cables, M8A3 NBC, M106A2,

M125A2, replace, 39-43

Switch, cables, brackets, M8A3 NBC,

M577A2, replace, 39-27

Auxiliary generator, M1068 ONLY:

Fuel return hose, 28.1-10

Fuel shutoff valve, replace, 28.1-2

Fuel supply hoses, replace, 28.1-4, 28.1-7

Auxiliary power, (slave) receptacle:

NATO, M577A2, M1068, replace, 9-10

Replace, all except M577A2, M1068, 9-2

Replace, M577A2, M1068, 9-6

Auxiliary tank:

Commander’s cupola, M113A2, M106A2,

M125A2, M1064, M1059, replace, 38-2

Mounting arm lock assembly and mount,

M113A2, replace, 38-10

Bear, M113A2, replace, 38-8

Side, M901A1, replace, 24-120

Smoke generator, M1059, replace, 40-6

Artillery, communication:

Inside cable, M577A2, replace, 37-5

Assembly:

Deaeration hoses, replace, 8-32

Parts, and, replace, 8-28

Tube, to coolant pump, replace, 8-30

Tube, to radiator, replace, 8-31

Balance hose, replace, 3-24

Bar, torsion, replace, 22-32

Bar, torsion, anchor, replace, 22-36

Base, cushion, low stow, M901A1, replace,

24-121

Base, guard plate, and, M113A2, M1059,

M109A1, replace, 27-2

Battery: Chain:

Repair, M113A2, 36-3

Replace, M113A2, 36-2

Cooling fan, replace, 8-44

Drum, M113A2, M1059, replace, 34-2

Filter switch, M3 NBC, M106A2, M125A2,

replace, 39-49

Filter switch, M3 NBC, M113A2 ambulance,

replace, 39-83

Orifice connector, support, quick coupling half,

M8A3/M13/M14, M113A2, M1059,

M577A2, M1068, replace, 39-34

Orifice connector, supports, quick disconnect

couplings, M8A3 NBC, M106A2, M125A2,

replace, 39-41

A (cont)

B

Access cover (M1068 ONLY), replace, 13-6.1

Leads (M1068 ONLY), replace 13-6.3

Box insulation and heat exchanger (Ml068

ONLY), 13-35

Access cover, remove/install, M577A2, 13-6

Box, all except M125A2, M1064, M106A2,

repair, 13-22

Box cover, M113A2, M901A1, M1059, repair,

13-20

Box, insulation and heat exchanger:

Replace, M113A2, M901A1, M1059, 13-37

Replace, M577A2, M1068, 13-35

Cable, M113A2, replace, 44-6

Index 2 Change 4
Subject, Page Subject, Page

TM 9-2350-261-20-1

B (cont)

Battery (cont):

Cover and leads, M113A2, M901A1, M1059,

replace, 13-3

Drawer, M106A2, M1064, M125A2, repair,

13-24

Drawer, insulation and heat exchanger,

M106A2, M1064, M125A2, replace, 13-32

Generator indicator malfunctions, 3-143

Ground lead, disconnect/connect, 13-2

Leads:

Replace, M106A2, M1064, M125A2, 13-10

Replace, M1068 13-6.1

Replace, M577A2, 13-7

Radio harness, to, M1059, M901A1, M113A2,

replace, 13-27

Retainers, and, all except M106A2, M1064,

M125A2, replace, 13-16

Retainers, M106A2, M1064, M125A2, replace,

13-18

Bearing and housing, pulley drive shaft, replace,

8-46

Bellcranks and brackets, pivot steer, replace,

23-64

Belts:

Fan drive, replace, 8-35

Generator drive:

100 amp, replace, 9-29

200 amp, replace, 9-47

Bilge pump:

Circuit breakers, replace, 16-12

Front and/or rear, and/or lights, do not

operate, 3-201

Pipes, front, replace, 16-5

Pipes, rear, replace, 16-11

System schematic, 3-206

Bilge pump and strainer:

Front, replace, 16-2

Rear, replace, 16-8

Bilge valve, front, replace, 16-7

Blackout curtain and frame, M577A2, M1068,

replace, 24-171

And tables (M1068 ONLY), replace, 24-170,

3-122

Blackout drive light does not work, 3-75

Blackout headlight:

Repair, 12-10

Replace, 12-9

Blackout marker light:

Repair, 12-8

B (cont)

Blackout marker light (cont):

Replace, 12-7

Blackout marker lights and/or tail lights do not

operate, 3-93

Blackout and/or service stop lights malfunction,

3-89

Blower:

Compartment, M577A2, M1068, replace,

17-15

Left rear utility outlet/blower does not work,

M577A2, 3-125

Switch, M577A2, M1068, replace, 17-16

Board, map, M577A2, replace, 24-247

Board, map, M1068, replace, 24-248.1

Box:

Communication equipment (M1068 ONLY),

replace

AC power extension A6, 40.1-48

AC power extension A7, 40.1-12

DC power extension A8, 40.1-13

DC power extension A9, 40.1-48

External communication All 40.1-18

LAN ground A15, repair, 40.1-16

LAN ground A15, 40.1-15

Power supply storage, 40.1-43

Power distribution A3, 40.1-49

Power entry A4, 40.1-54

Signal patch panel A10, 40.1-21

Switch box A18, 40.1-14

Tent interface panel A5, 40.1-46

UPS power extension Al6 and A17, 40.1-8

Distribution:

Repair, M113A2, 44-4

Replace, M113A2, 44-2

Distribution, 200 amp generator system

M1068, replace, 12-23

Grenade stowage, M106A2, M1064, M125A2,

replace, 24-250

Map, storage, M1068:

Repair, page 24-248.3

Replace, page 24-248.2

Periscope stowage, M106A2, M1064,

M125A2, replace, 24-251

Spare IR (M19) periscope stowage, replace,

24-239

Bracket:

Commander’s seat post, M8A3/M3 NBC,

M106A2, M125A2, replace, 39-48

Fuel filter mounting, replace, 6-130

Change 4 Index 3
TM 9-2350-261-20-1

Subject, Page

B (cont) B (cont)

Bracket (cont):

Fuel filter, mounting, M577A2, M1068 with

200 amp generator, replace, 9-45

High stow, M901A1, replace, 24-122

Launch tube stowage, M901A1, replace,

24-271

Mortar base stowage, M1064, replace,

24-254.1

Mortar base stowage, M106A2, replace,

24-255

Mount, filter switch, M13 NBC, M577A2,

39-21

Bulkhead connection (cont):

Fuel pump to, hose, M1068, replace, 29-36

Ramp control valve to, tube, replace, 28-22

To heater fuel inlet hose, replace tube 32-23

To heater hoses for the equipment heater,

M577A2, replace, 31-8

To heater tube, M106A2, M1064, M125A2,

replace, 29-33

To heater tube, M113A2, M1059, replace,

29-24

To heater tube, M577A2, M1068, replace,

29-40

Mount, filter switch, M3 NBC, M577A2,

replace, 39-23

Oilcan, replace, 24-237

Ramp, M981A1, M1064, replace, 25-39

Tube, to heater, M981, replace, 29-26

Buzzer:

Admittance and switch, M577A2, replace,

12-72

Brackets:

And hoses, Ml4 NBC, M113A2 ambulance,

replace, 39-90

And hoses, M8A3 NBC, M577A2, replace,

39-31

Admittance/tight rear utility outlet works

improperly, M577A2, 3-122

C

And hoses, M8A3 NBC, M10652, M125A2,

replace, 39-36

And switch assembly, cables, M8A3 NBC,

M577A2, replace, 39-27

Heater control box M1068, replace, 24-284

Intercom M1068, replace, 24-284

Kit mounting, replace, 44-8

Mortar base bridge, and bumpers, M106A2,

replace, 24-256

Mortar base bridge, M125A2, replace, 24-258

Muffler and, replace, 7-20

Rifle, replace, 24-238

Tripod stowage, M901A1, replace, 24-272

Windshield and, replace, 30-1.

Brake:

Cable:

Assembly, commander’s cupola, replace, 24-82

Differential, adjustment, 21-18

Disk, pivot steer, replace, 23-71

Levers, differential steering, replace, 23-20

Locking pawl, adjust, 23-4

Steering, adjust, 23-2

Breather collector can and hose, crankcase,

replace, 4-11

Bulkhead connection:

Fuel pump to, hose, replace, 31-7

Fuel pump to, hose, M106A2, M125A2,

replace, 32-21

Air compressor, electrical assembly, M1059,

replace, 40-13

And switch assembly, M8A3/M14 NBC,

M113A2, M1059A2, replace, 39-95

And switch assembly, M8A3 NBC, M106A2,

M125A2, replace, 39-43

Alarm, M113A2, replace, 44-6

Artillery communication:

Inside, M577A2, replace 37-5

Assembly, Repair, 14-9

Battery, M113A2, replace, 44-6

Detector, M113A2, replace, 44-5

Fuel shutoff, replace, 23-44

Power, repair, M577A2, M1068, 14-11

Reel holder assembly, M1064, repair,

24-208.3

Reel holder assembly, M1064, replace,

24-208.2

Speedometer, and adapter, replace, 11-17

Speedometer, repair, 11-19

Switch assembly, brackets, M8A3 NBC,

M577A2, replace, 39-27

Tachometer and adapter, replace, 11-14

Tube, external, replace, 42-8

Cap, filler, and strainer parts:

Replace, M1059, M113A2, M577A2, M901A2

6-8

Subject, Page

Index 4 Change 4
TM 9-2350-261-20-1

Subject, Page Subject, Page

C (cont) C (cont)

Cap, filler, and strainer parts (cont):

Replace, M125A2, M106A2, 6-78

Replace, M981, M1064, 6-30

Capstan kit, 34-1

Commander’s (cont):

Cupola (cont):

Cargo hatch:

Cover, replace, 24-113

Door hook and bumpers, M113A2, M901A1,

M1059, replace, 24-105

Interior latch, replace, 24-101

Latch, M901A1, repair, 24-115

Support, M901A1, replace, 24-116

Carrier:

Assembly:

Drive sprocket and cushions, replace, 22-30

Does not move in any shift lever position,

3-177

Does not pivot, 3-179

Chain assembly:

Repair, M113A2, 36-3

Replace, M113A2, 36-2

Charging system malfunctions, 3-55

Chart, dataplate, stencil, marker and decal:

M106A2, M125A2, 24-237

M113A2, 24-219

M577A2, 24-223

Chart, maintenance allocation, B-1

Chemical agent auto alarm:

Malfunctions, 3-233

System schematic, 3-236

Chemical agent wiring harness, M113A2,

replace, 44-6

Circuit breaker:

Armor shields, M113A2, M125A2, M106A2,

M1064, M1059, replace, 38-2

Azimuth lock, replace, 24-83

Brake assembly, replace, 24-82

Cover, M113A2, M106A2, M125A2, replace,

24-82

Cushioning pad and handle, M113A2,

M106A2, M125A2, M1064, replace, 24-78

Hatch latch and bumper, M113A2,

M106A2, M1064, M125A2, replace, 24-88

Interior latch, M113A2, M106A2, M125A2,

M1064, M1059, replace, 24-84

Machine gun mount, M113A2, M106A2,

M125A2, M1064, M1059, replace, 24-90

Machine gun mount stops, M1059, replace,

24-93

Hatch:

Cover, M577A2, M1068, replace, 24-97

Cushioning pad and handle, M577A2,

M1068, replace, 24-95

Hatch hook and bumper, M1068, M577A2,

replace, 24-99

Interior latch, M1068, M577A2, replace,

24-96

Jump seat, replace, 24-151

Platform:

Dome light, M577A2, M1068, replace, 12-70

Generator/regulator, 100 amp generator,

replace, 9-42

Replace, 11-4

Circuit breakers:

And post, M577A2, M1068, repair, 24-157

And post M577A2, M1068, replace, 24-157

Repair, 24-153

Replace, 24-153

Seat, M1068,:

Repair, 24-244.2

Bilge pump, replace, 16-12

Utility, rear, M577A2, M1068, replace, 17-11

Circuit 6 lead, all except M577A2, M1068,

replace, 13-13

Clamps, tent and, M577A2, replace, 24-181

Clean radiator, 8-7

Combat filler cover and lock:

Replace coolant, 8-33

Replace fuel, M113A2, M1059, M577A2,

M901A1, 6-7

Replace fuel, M981, M1064, 6-29

Commander’s:

Replace, 24-244.1

Seat, observation periscope, M901A1, replace,

24-161

Seat and post:

Bracket, M8A3/M3 NBC, M106A2,

M125A2, replace, 39-48

Repair, M113A2, M106A2, M125A2,

M1064, 24-145

Replace, 24-140

Replace, M106A2, M125A2, M1064, 24-142

Vision blocks and seals:

Replace, all except M106A2, 24-79

Common tools and supplements and special

tools/fixtures list, D-1

Compartment:

Cupola: Blower, M577A2, M1068, replace, 17-15

Change 4 Index 5
TM 9-2350-261-20-1

Subject, Page Subject, Page

C (cont)

Compartment (cont):

Fuel, drain, M125A2, M106A2, 6-77

Fuel, drain, M1068, 6-50

Fuel access cover and drain plug:

Fuel access cover M1068, replace, 6-57

Replace, M125A2, M106A2, 6-79

Ventilator, rear, air, replace, 24-117

Compressor assembly, air, M1059, replace,

40-19

Control box:

Engine coolant heater:

Repair, 32-42

Replace, 32-42

Heater, M3 NBC, M106A2, M125A2, replace,

39-57

Heater, M3 NBC, M577A2, replace, 39-25

Heater, M3 NBC, M1068, replace, 39-70

Personnel heater:

Repair, 29-43

Replace, 29-42

Coolant heater (cont):

Fuel pump (cont):

Replace, M113A2, M901A1, M1059, 32-12

Replace, M106A2, M125A2, 32-14

Replace, M577A2, M1068, 32-16

Malfunctions, 3-217

Pump, replace, 32-51

Fuel pump to bulkhead connection:

Replace, M113A2, M1059, M901A1, 32-18

Hose, replace, M577A2, M1068, 32-20

Hose, replace, M106A2, M125A2, 32-21

Replace, 32-49

System, engine, drain and fill, 32-10

Coolant heater and pump unit, replace, 32-45

Coolant pump, engine, idler pulley/belts, replace,

8-9

Coolant system:

Drain, 8-3

Fill, 8-5

Control linkage, trim vane:

Repair, 24-13

Replace, 24-14

Coolant temperature malfunctions, 3-144

Engine heater kit M1068, 32-1

Cooling fan assembly, replace, 13-44

Cover:

Control panel to adapter access plate electrical

cable assembly, M1059, 40-16

Control valve, fire extinguisher and external

handle, replace, 42-5

Conversion formula, use of torque wrench

adapters and the, 2-29

Cooling system:

Drain, 8-3

Flow diagram, 8-2

Hoses and fittings, all except M106A2,

M125A2, 32-34

Hoses and fittings, M106A2, M125A2,

replace, 32-27

Pump elbow hose and tube, radiator outlet

elbow to, replace, 8-14

Pump, engine, replace, 8-11

Pump to coolant heater wiring harness,

replace, 32-43

Tube, deaeration elbow-to-radiator elbow

inlet, replace, 8-12

Coolant heater:

Control box:

Repair, 32-42

Replace, 32-42

Exhaust elbow and pipes, replace, 32-41

Fuel pump:

Antenna, replace, 24-241

Access:

Battery, M577A2, remove/install, 13-6

Battery, M1068, remove/install, 13-16

Battery, and leads, M113A2, M901A1,

M1059, replace, 13-3

Fan drive pulley, and, replace, 8-41

Fuel compartment, M125A2, M106A2,

replace, 6-79

Fuel tank, M577A2, M1068, replace, 6-73

Fuel tank, and drain plugs, M981, M1064,

replace, 6-31

Huh, front, replace, 24-24

Power plant, bottom, replace, 24-32

Air cleaner, replace, 7-5

Battery box, M113A2, M901A1, M1059,

repair, 13-20

Cargo hatch, replace, M113A2, M901A1,

M1059, 24-103

Combat, fiber and lock:

Replace, M113A2, M1059, M577A2,

M901A1, 6-7

Replace, M981, M1064, 6-29

Replace, 8-33

Commander’s cupola, M113A2, M106A2,

M1064 M125A2, replace, 24-86

Index 6 Change 4

C (cont)
TM 9-2350-261-20-1

Subject, Page Subject, Page

C (cont)

Cover (cont):

Commander’s hatch, M577A2, M1068

replace, 24-97

Telepost and, replace, 17-8

Cover and lock:

Filler, combat, M113A2, M1059, M577A2,

M901A1, replace, 6-7

Filler, combat, M981, M1064, replace, 6-29

Filler, combat, replace, 8-33

Track shroud and, 12 inch (30 CM), replace,

22-2

Crank, engine does not, 3-15

Crankcase, breather collector can and hose,

replace, 4-11

Cranks slowly, engine, 3-25

Crew seat, M901A1, replace, 24-169

Cross-shaft links:

Differential, replace, 23-19

Steering levers, replace, 23-14

Cross-shafts and bearings:

Differential, replace, 23-16

Steering levers, replace, 23-10

Curtain and frame, blackout, M577A2, M1068,

replace, 24-171

Cushion base, low stow, M901A1, replace,

24-121

Cushion rope, mortar rotation, M106A2, replace,

24-254

Cushioning pad, replace, 24-236

Cylinder:

Breather hose, ramp, M106A2, M1064,

M125A2, replace, 28-92

Breather hose, ramp, all except M106A2,

M1064, M125A2, replace, 28-91

Discharge tubes, replace, 42-11

Suspension lockout, replace, 28-72

Cylinder and mount, fire extinguisher, replace,

42-13

Cylinder head fuel return tube and hose, left,

replace, 6-118

D

Data, equipment description and, 1-12

Data panel assembly (M1068 ONLY), replace

Curbside, 40.1-4

Roadside, 40.1-5

Dataplates, stencils, markers, and decals,

replace, 24-217

D (cont)

Dataplates, stencils, markers, and decals chart:

M106A2, M125A2, 24-227

M113A2, 24-219

M577A2, 24-219

M1068, 24-226.6

Deaeration elbow, thermostat, housing and,

replace, 8-15

Deaeration elbow to radiator inlet elbow coolant

tube, replace, 8-12

Deaeration hoses, auxiliary tank, replace, 8-32

Description and data, equipment, 1-12

Description of major components, location and,

1-12

Destruction of army material to prevent enemy

use, 1-8

Diagram:

Coolant flow, 8-2

Differential oil flow, 21-1

Engine oil flow, 4-1

Fuel flow, M113A2, M125A2, M106A2, 6-1

Fuel flow, M577A2, M1068, 6-2

Fuel flow, M981, M1064, with external fuel

tanks, 6-3

Hydraulic fluid flow:

All, 28-2

Power train/steering/brakes/gear

selection/throttle, 3-181

Transmission oil flow, 18-2

Wiring:

M106A2, M125A2, FO-4

M113A2, FO-1, FO-2

M577A2, FO-3

M901A1, FO-6

M1064, FO-8

M1068, FO-9 thru FO-11

Differential:

Brake adjustment, replace, 21-18

Cross-shafts and bearings, replace, 23-16

Cross-shaft links, replace, 23-19

Dipstick and breather, oil level, replace, 21-9

High oil temperature indicator comes on,

3-68

High oil temperature, switch, replace, 15-4

Hose and fittings:

Differential-to-oil-cooler, replace, 21-14

Gearbox-todifferential, replace, 21-12

Oil filter-to-pump, replace, 21-16

Oil pump-to-differential, replace, 21-10

Mounts, replace, 21-20

Change 4 Index 7
TM 9-2350-261-20-1

Subject, Page Subject, Page

D (cont) D (cont)

Differential (cont):

Oil filter and fittings, replace, 21-6

Oil filter element, replace, 21-8

Oil flow diagram, 21-1

Oil high temperature indicator malfunctions,

3-159

Dome light (cont):

Switch, rear, M577A2, M1068, replace, 12-69

Work improperly, 3-110

Door:

Pump, oil, replace, 21-2

Shaft, to transmission, replace, 20-2

Steering brake levers, replace, 23-20

Switch lead, replace, 15-5

Dipstick:

Differential oil level, and breather, replace,

21-9

Final drive filler tube and, replace, 20-12

Transfer gear-case oil level dipstick, tube and

Handle stop, interior, M106A2, M125A2,

replace, 33-2

Handle, and release, interior, M106A2,

M125A2, replace, 33-3

Power plant door:

Combat lock, replace, 24-19

Repair, 24-22

Replace, 24-21

Radiator access:

Replace, 8-28

Seals and fasteners, replace, 8-25

Seal, ramp, replace, 25-36

Drain:

Cooling system, 8-3

Fuel tank, M113A2, M901A1, M1059, 6-5

Fuel tanks, drain M577A2, M1068, 6-50

Fuel tanks, M981, M1064, 6-28

Drain cap and sight gage, replace, 8-42

Drain plugs, M981A, M1064, replace, 25-41

Drive:

Final, replace, 20-9

Sprockets, carrier assembly, and cushions,

replace, 22-32

Driver's:

Compartment floor plates, replace, 24-36

Footrest, new configuration, replace, 24-134

Power plant access panel, replace, 24-25

Seat, all models, replace, 24-127

Seat, repair, 24-129

Seat mount, new configuration,

repair, 24-132

Seat mount, old configuration,

replace, 24-131

Seat post assembly, new configuration, repair,

24-135

Seat post assembly, new configuration,

replace, 24-135

Driver’s hatch:

Cover and exterior lock, all except M901A1,

replace, 24-62

Cushioning pad, replace, 24-51

Hatch latch and bumper, all except M901A1,

replace, 24-64

Interior lock and latch, replace, 24-55

Periscope guard and quick release assembly,

repair, 24-57

guide, replace, 19-3

Distribution box:

Assembly:

Replace, 100 amp generator,

M106A2, M125A2, M1064,

Replace, 100 amp generator,

12-28

Replace, 100 amp generator,

12-32

Replace, 200 amp generator,

M125A2, M106A2, 12-48

Replace, 200 amp generator,

M1068, 2-23

Replace, 200 amp generator,

12-52

M113A2,

M1059, 12-44

M577A2,

M901A1,

M113A2,

M577A2,

M901A1,

Master switch to, wire assembly:

Circuit 49 lead, all except M577A2, M1068,

replace, 9-26

Circuit 49 lead, M577A2, M1068, replace,

9-49

Repair, M113A2, 44-4

Replace, M113A2, 44-2

Dome light:

And mount, repair, M577A2, M1068, 12-65

Bypass switch, M577A2, M1068, replace,

12-71

Circuit breaker, M577A2, M1068, replace,

12-70

Malfunction, M577A2, 3-117

Repair, all except M577A2, M1068, 12-61

Replace, all except M577A2, M1068, 12-60

Replace, M577A2, M1068, 12-64

Switch, front, M577A2, M1068, replace,

12-68

Index 8 Change 4
Subject, Page Subject, Page

TM 9-2350-261-20-1

D (cont)

Driver’s hatch (cont):

Repair, driver’s hatch, M901A1, 24-67

Vision block locks and seals, all except

M106A2, replace, 24-52

Drum:

Adapter, M113A2, M1059, replace, 34-3

Assembly, M113A2, M1059, replace, 34-2

Duct:

Heater, repair, 29-49

Heater, and hoses, replace, 28-47

E

Elbow:

Coolant heater exhaust, and pipes, replace,

32-41

Deaeration, to radiator inlet elbow coolant

tube, replace, 8-12

Engine air inlet to air box heater hoses,

replace, 6-112

Radiator outlet, to coolant pump elbow hose

and tube, replace, 8-14

Electrical cable assembly, fog oil pump, M1059,

replace, 40-14

Electrical/communication equipment,

M1068 ONLY:

Boxes, replace:

AC power extension A6, 40.1-48

AC power extension A7, 40.1-12

DC power extension A8, 40.1-13

DC power extension A9, 40.1-48

Data panel, curbside, 40.1-4

Data panel, roadside, 40.1-5

External communication All, 40.1-18

LAN ground A15, 40.1-15

Power distribution A3, 40.1-49

Power entry A4, 40.1-54

Power entry panel, 40.1-24

Signal patch panel A10, 40.1-21

Switch, 40.1-14

Tent interface panel A5, 40.1-46

UPS power extension A16, A17, 40.1-8

Cables, replace:

AC inverter W5, 40.1-62

AC power extension W7, 40.1-66

AC power extension W8, 40.1-68

AC light W11, 40.1-75

DC battery W4, 40.1-60

DC power extension W10, 40.1-73

E (cont)

Electrical/communication equipment, (cont)

M1068 ONLY (cont):

Cables, replace (cont):

DC inverter W6, 40.1-64

Ground strap W12 40.1-77

LAN A or B W103/104, 40.1-94

Power distribution W3, 40.1-58

Power extension W50, 40.1-92

Remote cascade W15, 40.1-26

Single point LAN W40, 40.1-86

W32, 40.1-78

W35, W28, and adapter, 40.1-82

W38, W29, and adapter, 40.1-84

W41, W42, and W43, 40.1-88

W45, 40.1-90

W124, 40.1-97

W126, 40.1-100

Inverter housing A2:

Terminal blocks TB1 and TB2,

replace, 40.1-28.1

Fluorescent light, replace, 40.1-56

Power control enclosure A1:

Faceplate and bracket, repair, 40.1-33

Indicators, replace, 40.1-29

Meters, AC and DC, replace, 40.1-29

Repair, 40.1-33

Replace, 40.1-41

Electrical systems (M1068 ONLY), 2-18.1

Electrical system schematic, 3-172

Electrical wiring diagram:

M106A2, M125A2, FO-4

M113A2, FO-1, FO-2

M577A2, FO-3

M901A1, FO-6

M1064, FO-8

M1068, FO-9 thru FO-11

Element:

Air cleaner, replace, 7-2

Engine oil filter and parts, replace, ‘4-3

Fuel filter, replace, 6-128

Engine:

Air inlet elbow to air box heater hoses,

6-112

Coolant heater kit, 32-1

Coolant pump, replace, 8-11

Coolant pump, thermostat housing to, replace,

8-18

Coolant pump idler pulley and belts, replace,

8-9

Change 4 Index 9
TM 9-2350-261-20-1

Subject, Page Subject, Page

E (cont) E (cont)

Engine (cont):

Coolant temperature switch, replace, 15-3

Cranks but will not start, 3-30

Cranks but will not start below 40 degrees

(air box heater is used), 3-34

Cranks slowly, 3-25

Does not crank, 3-15

Fuel pump, replace, 6-121

Fuel system diagram, 6-101

Left to right engine cylinder head fuel hose,

replace, 6-110

Equipment (cont):

Rack, right, M1068, 40.1-6

Special, 2-7

Stowage shelf, M901A1, replace, 24-180

Equipment heater:

Mount, front, replace, 4-2

Oil:

Control box, M577A2, replace, 31-11

Fuel pump to bulkhead connection hose,

M577A2, replace, 31-7

Exhaust, coolant heater, elbow and pipes,

replace, 32-41

Exhaust pipes, replace, 7-16

Expendable/durable supplies and materials list,

C-1

Filler cap and tube, replace, 4-13

Filter assembly, replace, 4-5

Filter bracket, hoses, and fittings, replace,

4-7

Filter element and parts, replace, 4-3

Flow diagram, 4-1

Gage rod and guide, replace, 4-15

Low pressure indicator fails to go off after

engine starts, 3-50

Low pressure indicator malfunctions, 3-148

Low pressure switch, replace, 15-2

overcools, 3-14

Overheats, 3-10

Power disconnect, replace, 23-57

Runs rough, stalls, or does not put out full

power, 3-44

Schematic:

Exterior catches and bumpers, mortar hatch,

M106A2, M1064, M125A2, replace, 24-109

Eye, lifting, replace, 24-2

F

Face mask:

Connector assembly, orifice, NBC equipment,

replace, 39-100

Gas filter, ventilated, M25/M25A1, replace,

39-101

Heater, ventilated, M25/M25A1, replace,

39-102

Hose assembly, ventilated, M25/M25A1,

replace, 39-99

Charging system, 100 amp, 3-65

Charging system, 200 amp, 3-66

Charging system, 200 amp, M981, 3-67

Fuel system, 3-52

Start switch, replace, 11-10

Engine coolant heater:

Control box, replace/repair, 32-42

Heater system, drain and fill, 32-10

Engine fuel:

Facsimile machine mount, replace, 40.1-2

Fan assembly, cooling, replace, 8-44

Fan drive:

Adjustable idler and pulley, replace, 8-39

Belts, replace, 8-35

Fixed idler and pulley, replace, 8-37

Pulley and access cover, replace, 8-41

Shaft, pulley, bearing, and housing, 8-46

Filler:

Flow diagram, M981, M1064 with external

fuel tanks, 6-3

System diagram, 6-101

System diagram, M113A2, M125A2,

M106A2, with inside tank or compartment,

6-1

Equipment:

Description and data, 1-12

Improvement recommendations (EIR),

reporting of, 1-11

Cap and strainer parts:

Replace, M981, M1064, 6-30

Replace, M1059, M113A2, M577A2,

M901A1, 6-8

Replace, M125A2, M106A2, 6-78

Cap and tube, oil, replace, 4-13

Combat cover and lock:

Replace, 8-33

Replace, M113A2, M1059, M577A2,

M901A1, 6-7

Replace, M981, M1064, 6-29

Flange:

Index 10 Change 4
TM 9-2350-261-20-1

Subject, Page

F (cont)

Filler (cont):

Fuel tank, filler flange, M577A2, M1068,

replace, 6-59

Strainer parts, replace, M577A2, M1068,

6-52

Tube and dipstick, final drive, replace, 20-12

Tube, transmission vent and, replace, 18-6

Filter:

And drain, transmission oil, replace, 18-8

And hoses, M13 NBC, M1068, replace, 39-61

And hoses, M13 NBC, M577A2, replace,

39-6

Bracket, hoses, and fittings, engine oil,

replace, 4-7

Differential and fittings, oil, replace, 21-6

Element, oil, differential, replace, 21-8

Element, engine oil and parts, replace, 4-3

Engine oil, assembly, replace, 4-5

Fuel:

Primary, replace, 6-123

Secondary, replace, 6-125

Gas, VFM, M25/M25A1, replace, 39-101

Secondary, to left cylinder head fuel hose,

6-108

Switch, mount bracket, Ml3 NBC, M577A2,

replace, 39-21

Switch, mount bracket, M3 NBC, M577A2,

replace, 39-23

Switch assembly, M3 NBC, M106A2,

M125A2, replace, 39-49

Switch assembly, M3 NBC, M113A2

ambulance, replace, 39-83

Final drive:

Filler tube and dipstick, replace, 20-12

Hull drain plugs, replace, 24-34

Pinion oil seal, replace, 20-11

Replace, 20-9

Shaft:

Left, replace, 20-5

Right, replace, 20-7

Fire extinguisher:

Control valve and external handle, replace,

42-5

Cylinder and mount, replace, 42-13

Cylinder discharge tubes, replace, 42-11

External cable tube, replace, 42-8

External handle shield:

Replace, M577A2, M1068, 42-3

Replace, M106A2, M1064, M125A2, 42-4

Subject, Page

F (cont)

Fire extinguisher (cont):

Replace, M113A2, M901A1, M1059, 42-2

Mount, M1059, replace, 42-16

Mount, portable, replace, 42-15

Flame detector switch:

Replace, 32-3

Repair, 32-5

Floor plates:

Driver’s compartment, replace, 24-36

Rear compartment, M113A2, M577A2,

replace 24-37

Rear compartment, M1068, replace 24-44.1

Replace, M1059, 24-42

Replace, M106A2, M125A2, M1064, 24-38

Replace, M901A1, 24-45

Fog oil pump:

Assembly, replace, 40-21

Electrical cable assembly, replace, 40-14

Fog oil tank:

Cover assembly, quick disconnect to adapter

access plate hose, M1059, replace, 40-33

Quick disconnect to adapter access plate hose,

M1059, replace, 40-31

Replace, M1059, 40-2

Footrest:

Driver’s, new configuration, replace, 24-134

Frame:

And air purifier, M8A3/M14 NBC, M113A2,

replace, 39-93

And air purifier, M8A3/M3 NBC, M106A2,

M125A2, replace, 39-46

And air purifier, M13, M1068, replace, 39-59

And air purifier, M8A3/M13, M577A3,

replace, 39-32

Mounts, tent and, M577A2, replace, 24-183

Driver’s, new configuration, replace, 24-134

Forms, records and reports, maintenance, 1-8

Front engine mount, replace, 4-2

Fuel:

Compartment, access cover:

Replace, M125A2, M106A2, 6-79

Compartment, drain, M125A2, M106A2, 6-77

Compartment-to-fuel pump:

Hose, fuel tank to fuel pump, M577A2,

M1068, replace, 29-36

Hose, fuel pump to bulkhead connection,

M577A2, M1068, replace, 29-38

Tube, M106A2 and M125A2, replace, 29-29

Engine, system diagram, 6-101

Change 4 Index 11
TM 9-2350-261-20-1

Subject, Page

F (cont) F (cont)

Fuel (cont):

Shutoff cable, replace, 23-44

Filter:

Elements, replace, 6-128

Mounting bracket, replace,

Fuel (cont):

Plug, smoke generator, M1059, replace,

40-23

6-130

Repair, temporary, M113A2, M1059,

M901A1, M577A2, 6-21

Replace, M577A2, M1068, 6-73

Replace, M113A2, M901A1, M1059, 6-11

Replace, M981, M1064, 6-34

Tank access covers:

And drain plugs, M981, M1064, replace,

6-31

Mounting bracket, M577A2, Ml068 with

200 amp gen, replace, 9-45

Primary, replace, 6-123

Secondary, replace, 6-125

Flow diagram:

M577A2, M1068, 6-2

M981, Ml064 with external fuel tanks, 6-3

M113A2, M125A2, M106A2, with inside

tank or compartment, 6-1

Hose, and fuel return tube, left cylinder

head, replace, 6-118

Hose, bulkhead connection to primary fuel

filter, replace, 6-102

Hose, primary fuel filter to engine fuel pump,

replace, 6-104

Hose, secondary fuel filter, engine fuel pump

to, replace, 6-106

Hoses, tubes and fittings:

Auxiliary generator, M1068, 28.1-4, 28.1-7,

28.1-10

Compartment-to-bulkhead, M125A2,

M106A2, replace, 6-81

Fuel return, M981, replace, 6-44

Fuel return, M1064, replace, 6-48.9

Fuel return, M577A2, M1068, replace, 6-66

Internal, M125A2, M106A2, replace, 6-85

Supply, M577A2, M1068, replace, 6-60

Supply, M981, replace, 6-39

Supply, M1064, replace, 6-48.3

Tank-to-bulkhead, M113A2, M1059,

M901A1, replace, 6-23

Level indicator malfunctions, 3-134

Lines, and guards, smoke generator, M1059,

replace, 40-25

Quantity selector, switch, M577A2, M1068,

replace, 17-17

Quantity transmitter:

Replace, M125A2, M106A2, 6-80

Replace, M113A2, M901A1, M1059, 6-9

Replace, M981, M1064, 6-32

Replace, M577A2, M1068, 6-54

Select switch to gage lead, M981 and

M1064, replace, 11-20

Tank:

Index 12 Change 4

Subject, Page

Replace, M577A2, M1068, 6-57

Tank filler flange, M577A2, M1068, replace,

6-59

Fuel filter:

Elements, replace, 6-128

Hose, secondary fuel, to engine fuel pump,

replace, 6-106

Primary, to engine fuel pump hose, replace,

6-104

Secondary, to left cylinder head fuel hose,

replace, 6-108

Fuel level indicator malfunctions, 3-134

Fuel lines, air from personnel heater, bleed, 29-8

Fuel lines and guards, smoke generator, M1059,

replace, 40-25

Fuel pump:

Engine, replace, 6-121

Engine coolant heater:

Replace, M106A2, M125A2, 32-14

Replace, M113A2, M901A1, M1059, 32-12

Replace, M577A2, M1068, 32-16

Equipment heater to bulkhead connection

hose, M577A2, replace, 31-7,

Heater, replace and service, M577A2, 31-16

Hose:

To bulkhead connection, replace, 31-7

To bulkhead connection, M106A2, M1064,

M125A2, replace, 29-31

To bulkhead connection, M577A2, M1068,

replace, 29-38

To heater shutoff valve, M1064, replace,

29-30.1

Personnel heater:

Replace, M106A2, M1064, M125A2, 29-11

Replace, M113A2, M1059, 29-8

Replace, M577A2, M1068, 29-13

service, 29-2

Fuel return:

Air box:
TM 9-2350-261-20-1

Subject, Page Subject, Page

F (cont)

Fuel return (cont):

Heater to fuel return tee and hose, 6-115

Left cylinder head return tube and hose,

6-118

Auxiliary generator, M1068, 28.1-10

Hoses, tubes, and fittings:

Replace, M981, 6-44

Replace, M1064, 6-48.9

Replace, M577A2, M1068, 6-66

Fuel shutoff cable:

Adjust, 23-46

Replace, 23-44

Fuel tank:

To fuel pump hose:

Hoses, tubes and fittings, internal, M1068,

6-4

Filler, cover and lock, M1068, 6-7

Filler cap and strainer parts M1068, 6-8

Repair tank M1068, 6-21

Quantity transmitter M1068, 6-57

Replace, M113A2, M901A1, M1059, 29-15

Fuze rack, vertical, replace, M106A2, 24-186

G (cont)

Grenade stowage box, M106A2, M1064,

M125A2, replace, 24-250

Grill, power plant, raise/lower, 5-2

Grill, power plant, remove and install, 5-11

Ground lead, horn and, replace, 12-2

Ground leads, starter, replace, 10-4

Guard:

Antenna, replace, 24-240

Headlight, replace, 12-11

Plate, and base, M113A2, M1059, M901A1,

replace, 27-2

Guards, stop light-tail light and, M981, M1064,

replace, 12-57

Gun:

Mount adapter assembly, replace, 38-5

Pintle socket, rear, M113A2, replace, 38-6

Traverse restrictor, replace, 38-7

G

Gages, instrument panel, replace, 11-11

General:

Information, 1-1

Maintenance instructions, 2-27

Generator:

Adjustment linkage:

100 amp, replace, 9-31

200 amp, replace, 9-34

Auxiliary, M1068 ONLY:

Fuel return hose, 28.1-10

Fuel shutoff valve, replace, 28.1-2

Fuel supply hoses, replace, 28.1-4, 28.1-7

Circuit breaker, generator/regulator, 100 amp,

replace, 9-42

Drive belts:

Replace, 100 amp, 9-29

Replace, 200 amp, 9-47

Electrical cable assembly, adapter access plate

to, M1059, replace, 40-13

Field switch, replace, 9-44

Set enclosure, M577A2, M1068, replace,

24-118 and 2-54

Grenade launcher wiring harness, smoke,

replace, 27-3

H

Hand throttle, replace, 23-42

Handle:

Commander’s cupola cushioning pad and,

Replace, M113A2, M106A2, M125A2,

M1064, 24-78

Replace, M577A2, M1068, 24-95

Fire extinguisher control valve and external,

replace, 42-5

Interior door, and release, M106A2, M125A2,

replace, 36-2

Interior door, stop, M106A2, M125A2,

replace, 36-3

Shield, external:

Replace, M106A2, M1064, M125A2, 42-4

Replace, M113A2, M901A1, M1059, 42-2

Replace, M577A2, M1068, 42-3

Handles and links, pivot steer, replace, 23-62

Handling techniques, 2-27

Harness:

Power, cable, M3 NBC, M106A2, M125A2,

replace, 39-54

Harness, trailer, replace 17-2

Cascade remote cable, M1068, replace,

40.1-26

Hatch:

Cargo, door, M113A2, M901A1, M1059,

replace, 24-103

Cargo, latch, M901A1, repair, 24-115

Cargo support, M901A1, replace, 24-116

Change 4 Index 13
TM 9-2350-261-20-1

Subject, Page Subject, Page

H (cont) H (cont)

Hatch (cont):

Cover M1068, commander, replace, 24-97

Covers, mortar, M106A2, M1064, M125A2,

replace, 24-113

Cushioning pad, driver’s, replace, 24-51

Cushioning pad and handle Ml068

commander, replace, 24-95

Hook and bumper M1068, commander,

replace, 24-99

Internal latch M1068, commander, replace,

24-96

Heater (cont):

Replace, 29-51

Control box:

Electronic equipment, replace, 31-11

Engine coolant, repair, 32-42

Engine coolant kit M1068, 32-1

M3 NBC, M106A2, M125A2, replace,

39-57

Driver’s, M901A1, repair, 24-67

Interior latch, cargo, replace, 24-101

Interior lock and latch, driver’s,

replace, 24-55

M3 NBC, M1068, replace, 39-70

M3 NBC, M577A2, replace, 39-25

Personnel, repair, 29-43

Personnel, replace, 29-42

Coolant:

Vision block locks and seals, driver’s:

Replace, all except M106A2 24-52

Headlight:

Blackout:

Repair, 12-10

Replace, 12-9

Exhaust elbow and pipes, replace, 32-41

Heater malfunctions, 3-217

Pump, replace, 32-51

Pump, fuel M1068, replace, 32-16

Replace, 32-49

Data, Stewart Warner, 31-1

Duct:

Repair, 29-49

Blackout marker:

Repair, 12-8

Replace, 12-7

Duct and hoses:

Replace, 29-47

Fuel:

Guard, replace, 12-11

High beam selector switch, replace, 12-77

Wiring harness, right, replace, 12-79

Service and infrared:

Repair, 12-5

Replace, 12-3

Headlights:

Inlet, hose, replace, 32-25

Lines, bleed air from compartment, 29-4

Fuel pump:

Infrared, does not operate, 3-83

Service, do not operate, 3-78

Heater:

Air box:

Air pump, replace, 6-133

And controllers, M3 NBC, M113A2

ambulance, replace, 39-86

And mounts, M13 NBC, M577A2, replace,

39-17

Coolant, M106A2, M125A2, replace, 32-14

Coolant, M113A2, M901A1, M1059,

replace, 32-12

Coolant, M577A2, M1068, replace, 32-16

Replace fuel pump assembly:

M106A2, M1064, M125A2, 29-11

M113A2, M1059, 29-8

M577A2, M1068, 29-13

Tee connection to hose, M981, replace,

29-17

Hose:

Ignition coil, replace, 6-132

Replace, 6-138

Solenoid valve, replace, 6-136

Wiring harness, replace, 6-140

Air intake and exhaust pipes:

Replace, M106A2, M1064, M125A2, 29-55

Replace, M106A2, M125A2, 29-53

Assembly:

Electronic equipment, replace, 31-16

Fittings, M3 NBC, M113A2 ambulance,

replace, 39-77

Fuel compartment to fuel pump, M577A2,

M1068, replace, 29-36

Fuel pump to bulkhead connection,

replace, 29-22

Fuel pump to bulkhead connection,

M106A2, M1064, M125A2, replace, 29-31

Fuel tank to fuel pump, M113A2, M901A1,

M1059, replace, 29-15

M3 NBC, M106A2, M125A2, replace,

39-51

Index 14 Change 4
Subject, Page Subject, Page

TM 9-2350-261-20-1

H (cont)

Heater (cont):

M13 NBC, M1068, replace, 39-65

Tee connection to fuel pump, M981,

replace, 29-17

Malfunctions:

Coolant, 3-217

Personnel, 3-207

M3 NBC, M106A2, M125A2, replace, 39-51

Pump, coolant, replace, 32-51

System, engine coolant, drain and fill, 32-10

Tube to bulkhead connection:

Replace, M106A2, M1064, M125A2, 29-33

Replace, M113A2, M1059, 29-24

Replace, M577A2, M1068, 29-40

VFM, M25/M25A1, replace, 39-102

Wiring harness, M13 NBC, M577A2, replace,

39-3

Wiring harness, M13 NBC, M1068, replace,

39-72

Heater and pump unit, coolant, replace, 31-45

Heater component maintenance, Stewart Warner

Corp., 31-1

High beam indicator light malfunctions, 3-140

High stow bracket, M901A1, replace, 24-124

High stow launcher support, M901A1, replace,

24-122

Hook and bumper:

Cargo hatch, door, M113A2, M901A1,

M1059, replace, 24-105

Commander’s cupola, hatch latch, M113A2,

M125A2, M1064, M106A2, replace, 24-88

Commander's hatch, M577A2, M1068, replace

24-99

Driver’s hatch latch, all except M901A1,

replace, 24-64

Hook, towing, replace, 24-3

Horizontal ammunition rack:

Repair, M1064, 24-190.3

Replace, M106A2, 24-191

Replace, M125A2, 24-189

Replace, M1064, 24-190.3

Hooks and brackets, stowage, M113A2, replace,

35-3

Horn:

Does not operate, 3-102

Switch, replace, 11-24

Horn and ground lead, replace, 12-2

Hose:

Air cleaner restriction indicator, replace, 7-9

H (cont)

Hose (cont):

Balance, replace, 8-24

Breather, on ramp cylinder:

Replace, all except M106A2, M1064,

M125A2, 28-91

Replace, M106A2, M1064, M125A2, 28-92

Bulkhead connection to ramp cylinder, replace,

28-89

Coolant heater fuel pump to bulkhead

connection:

Replace, M106A2, M125A2, 32-21

Replace, M577A2, M1068, 32-20

Differential:

Gearbox-to-differential, replace, 21-12

Oil filter-to-pump, replace, 21-16

Oil pump-to-differential, replace, 21-10

To oil cooler, replace, 21-14

Equipment heater fuel pump to bulkhead

connection, M577A2, replace, 31-7

Fuel compartment-to-fuel pump, M577A2,

M1068, 29-36

Fuel pump to bulkhead connection:

Replace, 29-19

Replace, M106A2, M1064, M125A2, 29-31

Fuel pump to heater shutoff valve, M1064,

29-30.1

Fuel tank to fuel pump:

Replace, M113A2, M901A1, M1059, 29-15

Heater fuel inlet, replace, 32-25

Oil cooler-to-transmission, and fittings,

replace, 18-4

Ramp pump:

To pressure release valve, replace, 28-9

Relief valve tee to quick disconnect, replace,

28-11

Shutoff valve to fuel pump, M577A2, replace,

31-5

Smoke generator, breather assembly, M1059,

replace, 40-5

Trans-to-oil cooler, and fittings, replace, 18-2

Hoses:

And brackets, M8A3 NBC, M577A2, replace,

39-30

And brackets, M8A3 NBC, M106A2,

M125A2, replace, 39-36

And brackets, M113A2 ambulance, replace,

39-90

And filters, M13 NBC, M1068, replace,

39-61

Change 4 Index 15
TM 9-2350-261-20-1

Subject, Page

Hoses (cont):

And filters,

39-6

Air cleaner,

H (cont)

Ml3 NBC, M577A2, replace,

replace, 7-3

Auxiliary tank deaeration, replace, 8-32

Coolant:

Fittings and, M113A2, M577A2, replace,

32-27

Fittings and, M160A2, M125A2, replace,

32-34

Pump elbow, and tube, to radiator outlet

elbow, replace, 8-14

Fittings and tubes:

Air box, drain, replace, 4-9

Compartment-to-bulkhead, M125A2,

M106A2, replace, 6-81

Fuel supply, replace, M577A2, M1068, 6-60

Internal, M125A2, M106A2, replace, 6-85

Pivot steer, brake, repair, 23-68

Pivot steer, brake, replace, 23-68

Return, M577A2, M1068, replace, 6-66

Tank-to-bulkhead, M113A2, M901A1,

M1059, replace, 6-23

Vent, M577A2, M1068, replace, 6-70

Heater duct and hoses:

Replace, 29-47

Heater, fittings, M3 NBC, M113A2

ambulance, replace, 39-77

Heater, M13, M1068, replace, 39-65

Housing:

Air cleaner, replace, 7-7

Thermostat and deaeration elbow, replace,

8-15

Thermostat to engine coolant tube, replace,

8-18

How to use this manual, vi

Hub:

Idler wheel, replace, 22-17

Road wheel, replace, 22-9

Hull drain plugs:

Final drive, replace, 24-34

Replace, 24-31

Hull, front access cover, replace, 24-24

Hull, welding, repair by, 26-1

Hupp heater electronic equipment, 31-1

Hydraulic fluid flow diagram:

All, 28-2

Hydraulic tank:

Ramp pump to, strainer tube, replace, 28-7

Subject, Page

H (cont)

Hydraulic tank (cont):

Repair, 28-17

Replace, 28-17,

Strainer, replace, 28-15

I

Identification, 2-27

Idler, fan drive:

Adjustable, and pulley, replace, 8-39

Fixed, and pulley, replace, 8-37

Idler pulley and belts, engine coolant pump,

replace, 8-9

Idler wheel:

Arm assembly:

Replace, 22-20

Hub, replace, 22-17

Replace, 22-16

Igniter, replace, 32-7

Ignition coil, air box heater, replace, 6-132

Indicator:

Air cleaner restriction, and hose, replace, 7-9

Differential high oil temp, comes on, 3-68

Engine oil low pressure, fails to go off after

engine starts, 3-50

Lights, panel lights and, replace, 11-5

Transmission oil hi temp, comes on, 3-71

Indicator malfunctions:

Battery/generator, 3-143

Coolant temperature, 3-144

Differential oil hi temp, 3-159

Engine oil low pressure, 3-148

Fuel level, 3-134

High beam light, 3-140

Transmission oil hi temp, 3-153

Infrared headlights:

Does not operate, 3-83

Service and, repair, 12-5

Service and, replace, 12-3

Infrared periscope works improperly, 3-112

Infrared power supply:

Assembly, replace, 12-134

Shock mount brackets, replace, 12-136

Inspection, 2-33

Instrument panel:

Gages, replace, 11-11

Illumination lights malfunction, 3-107

Mounts and ground lead, replace, 11-2

On-off switches, replace, 11-7

Index 16 Change 4
Subject, Page

TM 9-2350-261-20-1

Subject, Page

I (cont) L (cont)

Instrument panel (cont): Lead assembly utility outlet, M577A2, M1068,

Tachometer, replace, 11-13 replace 17-7

Insulation and heat exchanger:

Battery box, M113A2, M901A1, M1059,

replace, 13-37

Battery box, M577A2, M1068, replace, 13-35

Battery drawer, M106A2, M1064, M125A2,

replace, 13-32

Left table, M577A2, M1068, replace, 24-178

Lifting eye, replace, 24-2

Lifting eyebolt, cover, and plug, transfer

gearcase, replace, 19-6

Light:

Integrated components, 2-8

Integrated systems, 2-1

Interior release mechanisms, mortar hatch,

M106A2, M1064, M125A2, replace, 24-107

Blackout drive, does not operate, 3-75

Blackout marker :

Repair, 12-8

Replace, 12-7

Tail lights do not operate, and/or, 3-93

Dome, all except M577A2, M1068:

Repair, 12-61

Replace, 12-60

J

K

Kit:

Capstan, 34-1

Litter, M113A2, 36-1

Mounting brackets, M113A2, replace, 44-8

L

Latch:

Cargo hatch interior, replace, 24-101

Commander’s cupola interior, M113A2,

M106A2, M125A2, M1064, M1059, replace,

24-84

Commander’s hatch interior, M577A2,

M1068, M471A1, replace, 24-97

Launch tube stowage bracket, M901A1, replace

24-271

Launcher:

Smoke grenade, malfunction, 3-196

High stow, support, M901A1, replace, 24-124

Lead:

Battery, M106A2, M1064, M125A2, replace,

13-10

Battery, M1068, replace, 13-6.1

Battery, M577A2, replace, 13-7

Battery ground, disconnect/connect, 13-2

Circuit 6, all except M577A2, M1068,

replace, 13-13

Fuel select switch to gage, M981, M1064,

replace, 11-20

Horn and ground, replace, 12-2

Instrument panel mounts and ground,

replace, 11-2

Dome, M577A2, M1068:

Malfunction, 3-117

Mount and, repair, 12-65

Replace, 12-64

Headlight high beam selector switch, replace,

12-77

Lead assembly, master switch panel to dome,

M577A2, M1068, replace, 12-67

Service tail, does not operate, 3-98

Stop light-tail:

And guards, M981, M1064, replace, 12-57

Left, repair, 12-13

Left, replace, 12-12

Right, repair, 12-13

Right, replace, 12-14

Switch, main, replace, 11-9

Tent assembly, M577A2, replace, 12-76

Lights:

Blackout marker, and/or tail lights, do not

operate, 3-93

Dome, work improperly, 3-110

Fluorescent, M1068, replace, 40.1-56

Front dome, M1068, replace, 12-68

Front and/or rear bilge pump and/or, do not

operate, 3-201

Instrument panel illumination, malfunction,

3-107

Operate, no exterior, 3-73

Panel and indicator, replace, 11-5

Panel, replace, 11-22

Rear dome, replace M1068, 12-69

Service and/or blackout stop, malfunction,

3-89

Tail light, replace M1068, 24-276

Change 4 Index 17
TM 9-2350-261-20-1

Subject, Page Subject, Page

L (cont) M (cont)

Lights (cont):

Tent light, M577A2, replace, 12-76

Trailer, do not operate, 3-100

Warning panel, replace, 11-22

Linkage:

Accelerator:

Maintenance (cont):

Forms, records, and reports, 1-8

Instructions, general, 2-27

Preparation for, 2-27

Malfunctions:

Upper, repair, 23-33

Upper, replace, 23-31

Accelerator and transmission throttle valve,

adjust, 23-34

Generator and adjustment:

100 amp, replace, 9-31

200 amp, replace, 9-34

Pivot steer, adjust, 23-72

Ramp:

Replace, M113A2, M901A1, M1059, 25-7

Replace, M577A2, M1068, 25-26

Replace, M106A2, M1064, M125A2, 25-15

Selector, range, replace, 23-55

Transmission and lower accelerator:

Repair, 23-29

Replace, 23-25

Charging system, 3-55

Coolant heater, 3-217

Speedometer, 3-227

Tachometer, 3-230

Manual, how to use this, vi

Map board, M577A2, replace, 24-247

*Map board, M1068, replace, 24-248.1

Map storage box, M1068:

Repair, 24-248.3

Replace, 24-248.2

Marker light and/or tail lights do not operate,

blackout, 3-93

Markers, and decals, dataplates, stencils,

replace, 24-217

Master cylinder and hoses, pivot steer, replace,

23-66

Litter kit, initial installation of, M113A2, 36-1

Location and description of major components,

1-12

Lock:

Commander’s cupola azimuth, replace, 24-83

Driver's hatch cover and exterior, all except

M901A1, replace, 24-62

Power plant door combat, replace, 24-19

Ramp:

Adjust, M113A2, M901A1, M1059, 25-2

Adjust, M577A2, M1068, 25-19

Adjust, M106A2, M1064, M125A2, 25-10

Lock and latch, driver’s hatch interior, replace,

24-55

Lock assembly and mount, rear armor shield

mounting arm, replace, 38-10

Lock lever and arms, ramp, replace, 25-5

Lock lever and cable, ramp, M577A2, M1068,

replace, 25-23

Locking pawl, adjust brake, 23-4

Master switch panel lead assembly, to dome

lights, M577A2, M1068, 12-67

Master switch:

Panel assembly:

Early slave receptacle, all except M577A2,

replace, 9-19

Late slave receptacle, all except M577A2,

M1068, replace, 9-16

Replace, M577A2, 9-23

Replace, 9-13

Replace M1068, 9-22

Master switch on indicator does not light, 3-129

Master switch to distribution box wire assembly:

Circuit 49 lead, all except M577A2, M1068,

replace, 9-26

Circuit 49 lead, M577A2, M1068, replace,

9-49

Materials list, expendable/durable supplies and,

Appendix C, C-1

Metric equivalents, 1-18

Missile rack:

Replace, M901A1, 24-267

Retainers, M901A1, replace, 24-270

Mortar base stowage brackets:

Replace, M1064, 24-254.1

Replace, M106A2, 24-255

Replace, M125A2, 24-258

Mortar bipod stowage cover and brackets,

M125A2, replace, 24-259

M

Machine gun platform mount assembly, 7.62

mm M60, M113A2, replace, 38-5

Main light switch, replace, 11-9

Maintenance:

Allocation chart, B-1

Index 18 Change 4
TM 9-2350-261-20-1

Subject, Page Subject, Page

M (cont) M (cont.)

Mortar bridge stowage brackets and bumpers,

M106A2, replace, 24-256

Mortar hatch:

Muffler extension and valve, replace, 7-18

Covers, M106A2, M1064, M125A2, replace,

24-113

N

Exterior catches and bumpers, M106A2,

M1064, M125A2, replace, 24-109

Interior release mechanisms, M106A2,

M1064, M125A2, replace, 24-107

Mortar rotator cushion rope, M106A2, replace,

24-254

Mount:

Neutral start switch, replace, 23-55

Nomenclature cross reference list, 1-9

Non-skid plates, M106A2, M1064, M125A2,

replace, 33-4

O

Oil:

Assembly, 7.62 MM M60 machine gun

platform, M113A2, replace, 38-5

Bracket, filter switch, M13 NBC, M577A2,

replace, 39-21

Commander’s cupola machine gun:

Repair, M113A2, M106A2, M125A2,

M1064, M1059, 24-90

Driver’s seat:

Can bracket, replace, 24-237

Cooler-to-transmission hose, replace, 18-2

Filler cap and tube, replace, 4-13

Filler, transfer gearcase:

Disassemble/assemble, 19-5

Replace, 19-4

Old configuration, replace, 24-127

New configuration, replace, 24-247

Fire extinguisher cylinder and, replace, 42-13

Fire extinguisher, M1059, replace, 42-16

Fire extinguisher, portable, replace, 42-15

Front engine, replace, 4-2

Rear armor shield mounting arm lock

assembly and, replace, 38-10

Shock absorber, replace, 22-29

Transfer gearcase resilient, replace, 19-2

Traversing unit and spacer, M901A1, replace,

24-275

Fog, tank quick disconnect to adapter access

plate hose, M1059, replace, 40-31

Gage rod and guide, replace, 4-15

Level, dipstick, tube and guide, transfer

gearcase, replace, 19-3

Low pressure indicator fails to go off after

engine starts, 3-50

Low pressure indicator malfunctions, engine,

3-148

Seal, final drive pinion, replace, 20-11

Transmission, hi temp indicator malfunctions,

3-153

Mount stops, commander’s cupola machine gun,

M1059, replace, 24-93

Mounting bracket, fuel filter, M577A2, M1068

with 200 amp gen, replace, 9-45

Mounts:

And heaters, M13 NBC, M577A2, replace,

39-17

Differential, replace, 21-20

Front engine, replace, 4-2

Facsimile machine assembly M1068, 40.1-2

Ground lead, instrument panel, and, replace,

11-2

Operation, principles of, 2-1

Operator’s seat, M1059, repair, 24-150.1

Operator’s seat, M1059, replace, 24-149

Orifice connector assembly:

NBC equipment, replace, 39-100

Support, quick coupling half,

M8A3/M13/M14, M113A2, M1059,

M577A2, M1068, replace, 39-34

Supports, quick disconnect couplings, M8A3

NBC, M106A2, M125A2, replace, 39-41

Outlet:

Left rear utility, admittance buzzer works

improperly, M577A2 and M1068, 3-125

Right rear utility, blower does not work,

M577A2, 3-122

Printer M1068, replace, 40.1-52

Move in any shift lever position, carrier does

not, 3-177

Muffler and brackets, replace, 7-20

P

Pad:

Cushioning, replace, 24-236

Change 4 Index 19
TM 9-2350-261-20-1

Subject, Page

P (cont)

Pad (cont):

Tow cable, replace, 24-6

Pad and handle, commander’s cupola cushioning,

M113A2, M106A2, M1064, M125A2, replace,

24-78

Pad and handle, commander’s hatch cushioning,

M577A2, M1068, replace, 24-95

Panel:

Control to adapter access plate electrical cable

assembly, smoke generator, M1059, replace,

40-16

Driver’s power plant access, replace, 24-25

Indicator lights, replace, 11-5

Instrument:

Gages, replace, 11-11

Mounts and ground lead, replace, 11-2

On-off switches, replace, 11-7

Warning lights, replace, 11-22

Panel assembly:

Master switch:

Early slave receptacle, all except M577A2,

replace, 9-19

Late slave receptacle, all except M577A2,

M1068, replace, 9-16

Replace, M577A2, M1068, 9-22

Smoke generator, control, M1059, 40-9

Panels, power plant rear access, M113A2,

M901A1, replace, 24-27

Parts:

Filler cap and strainer:

M125A2, M106A2, replace, 6-78

M1059, M113A2, M577A2, M901A1,

replace, 6-8

M577A2, M1068, replace, 6-52

M981, M1064, replace, 6-30

Pedal:

Assembly, upper accelerator, replace, 23-23

Lower accelerator, replace, 23-22

Periscope:

Guard, driver’s hatch, replace, 24-57

Infrared, works improperly, 3-112

Quick release assembly, driver’s hatch:

Repair, 24-57

Stowage box:

Replace, M106A2, M1064, M125A2, 24-250

Spare IR (M19) 24-239

Personnel heater malfunctions, 3-207

Personnel seats:

Backrests, cushions, and straps:

Subject, Page

P (cont)

Personnel seats (cont):

Replace, M106A2, M1064, M125A2, 24-167

Replace, M113A2, 24-163

Cushions and straps, M577A2, M1068,

replace, 24-165

Pin:

Multiple, and socket identification, 14-2

Shock absorber, replace, 22-28

Pintle socket, rear gun, M113A2, replace, 38-6

Pintle, towing:

Repair/Replace, 24-4

Pipes:

Bilge Pump:

Front, replace, 16-5

Bear, replace, 16-11

Coolant heater exhaust elbow and, replace,

32-41

Exhaust, replace, 7-16

Heater air intake and exhaust:

Replace, all except M106A2, M125A2,

29-53

Replace, M106A2, M1064, M125A2, 29-55

Pivot steer:

Bellcranks and brackets, replace, 23-64

Brake disk, replace, 23-71

Brakes, hoses, tubes and fittings:

Repair, 23-68

Replace, 23-68

Handles and links, replace, 23-62

Linkage, adjust, 23-72

Master cylinders and hoses, replace, 23-66

System, bleed, 23-61

Plate, and base, guard, replace, M113A2,

M901A1, M1059, 27-2

Plates, non-skid, M106A2, M1064, M125A2,

replace, 33-4

Plates, tiedown M1068, replace, 24-236.1

Platform, commander’s:

And post, M577A2, M1068:

Repair, 24-157

Replace, 24-157

Repair, M577A2, 24-153

Replace, 24-153

Plug, smoke generator fuel tank, M1059,

replace, 40-23

Plugs:

Box beam, replace, 24-35

Drain, M981A1, M1064, replace, 25-41

Final drive, hull, replace, 24-34

Index 20 Change 4
TM 9-2350-261-20-1

Subject, Page Subject, Page

P (cont)

Plugs (cont):

Hull drain, replace, 24-34

Post, commander’s seat and

Replace, 24-140

Replace, M106A2, M125A2, M1064, 24-142

Repair, M113A2, M125A2, M106A2, M1064,

24-145

Post assembly:

Driver’s seat:

Preparation for storage or shipment, 1-8

Pressure indicator fails to go off after engine

starts, 3-50

Pressure relief valve:

Hose, ramp pump to, replace, 28-9

Tube, ramp pump to, replace, 28-28

Preventive maintenance checks and services,

2-39

Repair, new configuration, 24-135

Replace, new configuration, 24-135

Repair, M113A2, 24-135

Replace, M113A2, 24-135

Power:

Cable, M577A2, M1068, repair, 14-11

Cable harness, M3 NBC, M106A2, M125A2,

replace, 39-54

Engine disconnect, 23-57

Engine runs rough, stalls or doesn’t put out

full, 3-44

Power plant:

Principals of operation, 2-1

Printer mount M1068, replace, 40.1-52

Pulley and access cover, fan drive, replace, 8-41

Pulley drive shaft, bearing and housing, replace,

8-46

Pulley and belts, idler, replace, 3-9

Pulleys, wire rope and:

Replace, all except M106A2, M1064,

M125A2, 25-30

Replace, M106A2, M1064, M125A2, 25-31

Pulleys/belts, engine coolant pump idler, replace,

8-9

Pump:

Access cover, bottom, replace, 24-32

Access panel:

Driver’s, replace, 24-25

Rear, all except M577A2, M106A2,

M125A2, replace, 24-27

Rear, M577A2, M106A2, M125A2, M1068,

M1064, replace, 24-29

Pear, M1059, replace, 24-28.1

Door:

Combat lock, replace, 24-19

Replace, 24-21

Repair, 24-22

Grill:

Entry panel, M1068, repair, 40.1-24

Support arm, replace, 24-50

Raise/lower, 5-2

Remove and install, 5-11

Rear access panel:

Replace, all except M577A2, M106A2,

M125A2, 24-27

Replace, M577A2, M106A2, M125A2,

M1068, M1064, 24-29

Power supply:

Circuit breakers, bilge, replace, 16-12

Coolant heater, replace, 32-54

Coolant heater fuel:

Replace, M106A2, M125A2, 32-14

Replace, M113A2, M901A1, M1059, 32-12

Replace, M577A2, M1068, 32-16

Differential oil, replace, 21-2

Engine coolant, replace, 8-11

Engine fuel, replace, 6-121

Fog oil:

Assembly, M1059, replace, 40-21

Electrical cable assembly, M1059, replace,

40-14

Pipes:

Front bilge, replace, 16-5

Rear bilge, replace, 16-11

Ramp, replace, 28-81

Pump and strainer:

Front bilge, replace, 16-2

Rear bilge, replace, 16-8

Pump to bulkhead connection hose, fuel, replace:

M106A2, M1064, M125A2, 29-31

Assembly, infrared, replace, 12-134

Cable assembly, smoke generator, M1059,

replace, 40-11

Shock mount brackets, infrared, replace,

12-136

Q

R

Rack:

Ammunition stowage, M901A1, replace,

24-266

P (cont)

Change 4 Index 21
TM 9-2350-261-20-1

Subject, Page Subject, Page

R (cont)

Rack (cont):

Base, left side, M1068, replace, 24-244.5

Base, right side, M1068, replace, 24-244.3

Horizontal ammunition:

Repair, M1064, 24-190.3

Replace, M106A2, 24-191

Replace, M125A2, 24-189

Replace, M1064, 24-190.3

Rifle, M1064, replace, 24-160.1

Missile:

Ramp (cont):

To bulkhead connection tube, replace, 28-22

To hydraulic tank hose, replace, 28-13

Tube, quick disconnect to, replace, 28-22

Cylinder:

Replace, M901A1, 24-267

Retainers, M901A1, replace, 24-270

Radio stowage:

Breather hose on, all except M106A2,

M1064, M125A2, replace, 28-91

Breather hose on, M106A2, 1064, M125A2,

replace, 28-92

Bulkhead connection hose, replace, 28-89

Replace, 28-93

Door:

Left, bulkhead, M577A2, M1068, replace,

24-245

Replace, M125A2, M1064, M106A2, 24-249

Right front, M577A2, replace, 24-242

Right front, M1068, replace, 24-242.1

Vertical ammunition, M106A2, M125A2,

replace, 24-188

Vertical ammunition, M1064, replace,

24-190.1

Handles, replace, 25-34

Hook and spring, all except M981A1,

M1064, replace, 25-33

Hook and spring, M1981A1, M1064,

replace, 25-32.1

Seal, replace, 25-32

Switch, and mount, M577A2, M1068,

replace, 12-74

Vertical fuze, M106A2, replace, 24-186

Wall, stowage, M577A2, replace, 24-243

Radiac wire harness, M113A2, M577A2, M1068,

replace, 17-13

Radiator:

Access door:

Replace, 8-27

Seal and fasteners, replace, 8-25

Clean, 8-7,

Deaeration elbow to inlet elbow coolant tube,

8-12,

Outlet elbow to coolant pump elbow hose and

tube, 8-14,

Parts, and, replace, 8-20

Radio(s) does not work, 3-116

Radio stowage rack:

Left bulkhead, M577A2, M1068, replace,

24-245

Inoperable/unsafe, raise/lower, 28-3

Inoperable/unsafe M1068, raise/lower, 28-4

Linkage:

Replace, M113A2, M901A1, M1059, 25-7

Replace, M577A2, M1068, 25-26

Replace, M106A2, M1064, M125A2, 25-15

Lock:

Adjust, M113A2, M901A1, M1059, 25-2

Adjust, M577A2, M1068, 25-19

Adjust, M106A2, M1064, M125A2, 25-10

Lock lever and arms, replace, M113A2,

M901, M1059, 25-5

Lock lever and cable, M577A2, M1068,

replace, 25-23

Operation is slow or sluggish, 3-184

Pump:

Replace, 28-81

M106A2, M1064, M125A2, replace, 24-249

Right front, M577A2, replace, 24-242

Right front, M1068, replace, 24-242.1

Ramp:

Access door stop bracket, M981A1, M1064,

replace, 25-40

Bracket, M981A1, M1064, replace, 25-39

Control valve:

And fittings, all, replace, 28-84

To hydraulic tank strainer tube, replace,

28-7

To pressure relief valve hose, replace, 28-9

Seal, replace, 25-36

Schematic, hydraulic system, 3-188

Vision port:

Replace, M901A1, 25-37

Shield, M901A1, replace, 25-37

Will not lower, 3-182

Will not raise or free falls, 3-185

Range selector:

Linkage, replace, 23-55

Index 22 Change 4

R (cont)
Subject, Page Subject, Page

TM 9-2350-261-20-1

R (cont)

Range selector (cont):

Trans, repair, 23-50

Trans, replace, 23-48

Rear armor shields, M113A2, replace, 38-8

Rear armor shield mounting arm lock assembly

and mount, M113A2, replace, 38-10

Rear compartment:

Air ventilator, replace, 24-117

Floor plates, M113A2, M577A2, replace,

24-36

Receipt of material, service upon, 2-24

Receptacle:

Auxiliary power (slave):

Replace, all except M577A2, M1068, 9-2

Replace, M577A2, M1068, 9-6

Replace, NATO, M577A2, M1068, 9-10

Circuit breakers, rear utility, M577A2,

M1068, 17-11

Radiac wiring harness, M113A2, M577A2,

M1068, replace, 17-13

Repair, 14-7

Utility outlet:

Lead assembly, M577A2, M1068, replace,

17-7

Rear, M577A2, M1068, replace, 17-9

Replace, all except M577A2, M1068, 17-5

Recommendations (EIR), reporting of equipment

improvement, 1-11

Records, and reports, maintenance forms, 1-8

Reel holder assembly, cable, M1064:

Repair, 24-208.3

Replace, 24-208.2

References, A-1

Regulator:

Assembly

100/200 amp generator, replace, 9-40

Circuit breaker, regulator/generator, (100

amp), replace, 9-42

Voltage:

100/200 amp generator, adjust, 9-38

Release, trim vane:

Repair, 24-17

Replace, 24-17

Relief valve tee to quick disconnect hose, replace,

28-22

Repair, 2-34

Repair parts, special tools, TMDE, and support

equipment, xiii

R (cont)

Reports, maintenance forms, records, and, 1-8

Restriction indicator and hose, air cleaner,

replace, 7-9

Restrictor, gun traverse, replace, 38-7

Retainers:

Battery and, all except M106A2, M1064,

M125A2, replace, 13-16

Battery and, M106A2, M1064, M125A2,

replace, 13-18

Missile rack, M901A1, replace, 24-270

Rifle brackets, replace, 24-238

Rifle rack, M1064, replace, 24-160.1

Right forward table, M577A2, M1068, replace,

24-175

Right rearward table, M577A2, M1068, replace,

24-173

Right rear utility outlet/admittance buzzer does

not operate, M577A2, 3-131

Rod and guide, oil gage, replace, 4-15

Road wheel:

Hub, replace, 22-9

Replace, 22-7

Support arm, replace, 22-12

Rope and pulleys, wire, replace:

All except M106A2, M1064, M125A2, 25-30

M106A2, M1064, M125A2, 25-31

S

Schematic:

Air box heater system, 3-54

Bilge pump system, 3-206

Chemical agent auto alarm system, 3-236

Electrical system:

Indicators, all carriers, 3-171

M577A2, additional, 3-174

M981, additional, 3-175

Engine charging system:

100 amp, 3-65

200 amp, 3-66

200 amp, M981, 3-67

Engine fuel system, 3-52

Ramp hydraulic system, 3-188

Starting system, 3-53

Stop bracket, ramp access door, M981A,

M1064, replace, 25-40

Seal, ramp, replace, 25-36

Seat:

Crew, M901A1, replace, 24-169

Change 4 Index 23
TM 9-2350-261-20-1

Subject, Page Subject, Page

S (cont)

Seat (cont):

Commander’s:

Jump, replace, 24-151

M1068, repair, 24-144.2

M1068, replace, 24-144.1

Observation periscope, M901A1, replace,

24-161

Shield external handle, replace:

M106A2, M1064, M125A2, 42-4

M113A2, M901A1, M1059, 42-2

M577A2, M1068, 42-3

Sheild rear armor, mounting arm lock assembly

and mount, replace, 38-10

Shields:

Driver’s, all configurations, repair, 24-127

Driver’s, repair, 24-129

Operator’s, M1059, repair, 24-150.1

Operator’s, M1059, replace, 24-149

Personnel:

Commander’s cupola armor, M113A2,

M106A2, M125A2, M1064, M1059, replace,

38-2

Backrests, cushions, and straps, M106A2,

M1064, M125A2, replace, 24-167

Backrests, cushions, and straps, M113A2,

replace, 24-163

Cushions and straps, M577A2, M1068,

replace, 24-165

Rear armor, M113A2, replace, 38-8

Shipment, preparation for storage or, 1-8

Shock absorber:

Post assembly, driver’s, new configuration:

Repair, 24-135

Replace, 24-135

Mount, replace, 22-29

Pin, replace, 22-28

Replace, 22-26

Shutoff cable, fuel:

Adjust, 23-46

Replace, 23-44

Station operator’s, repair, 24-150.4

Station operator’s, replace, 24-150.3

Seat and post, commander’s:

Repair, M113A2, M106A2, M125A.2, M1064,

24-145

Replace, 24-126

Replace, M106A2, M125A2, M1064, 24-142

Secondary filter to left cylinder head fuel hose,

6-108

Shutoff valve to fuel pump, hose, M577A2,

replace, 32-6

Side armor, M901A1, replace, 24-120

Sight extension arm stowage brackets:

M106A2, M125A2, replace, 24-253

M1064, replace, 24-252.1

Sight gage, drain cap and, replace, 8-42

Smoke generator:

Access plate and gasket, M1059, replace,

40-27

Semiannual (S) operation checks, unit

preventative maintenance checks and services,

3-41

Service:

Armor, M1059, replace, 40-34

Assembly and support bracket, M1059,

replace, 40-6

Breather hose assembly, M1059, replace,

40-5

Headlights do not operate, 3-78

Tail light does not operate, 3-98

Upon receipt of material, 2-24

Service and, infrared headlights:

Repair, 12-3

Replace, 12-3

Service and/or blackout stop lights malfunction,

3-89

Shaft:

Compressor reservoir to adapter access plate

air hose, M1059, replace, 40-29

Control panel assembly, M1059, replace, 40-9

Fuel lines and guards, M1059, replace, 40-25

Fuel tank plug, M1059, replace, 40-23

Power supply, cable assembly, M1059,

replace, 40-11

Final drive, left, replace, 20-5

Final drive, right, replace, 20-7

Trans-differential, replace, 20-2

Shelf assembly, (M1068), replace, 24-244.1

Shelf, equipment stowage, M901A1, replace,

24-180

Smoke grenade launcher:

Malfunction, 3-196

Wiring harness, M113A2, M1059, M901A1,

replace, 27-2

Socket:

Identification, multiple pin and, 14-2

Rear gun pintle, M113A2, replace, 38-6

Solenoid and bracket, suspension lockout, replace,

28-74

Index 24 Change 4

S (cont)
Subject, Page Subject, Page

TM 9-2350-261-20-1

S (cont)

Solenoid valve, air box heater, replace, 6-136

Solenoid wiring harness, suspension lockout,

replace, 28-76

Speedometer:

Cable, repair, 11-19

Cable and adapter, replace, 11-17

Instrument panel, replace, 11-16

Malfunctions, 3-227

Stalls or does not put out full power, engine

runs rough, 3-44

Start:

Below 40 degrees, air box heater is used,

engine cranks but will not, 3-34

Engine cranks but will not, 3-30

Starter:

Ground leads, replace, 10-4

Replace, 10-2

Station operator’s seat, M1068:

Repair, 24-150.4

Replace, 24-150.3

STE/ICE-R Troubleshooting 3-9

Steering:

Brake adjustment, 23-2

Brakes malfunction, 3-176

Steering levers:

Cross-shafts, and bearings, replace, 23-10

Cross-shafts, and links, replace, 23-14

Left/right, repair, 23-7

Stencils, markers, and decals, dataplates,

replace, 24-217

Stewart Warner Corp., heater component

maintenance, 30-1

Stop light switch and bracket, replace, 12-132

Stop light-tail light:

Left:

Repair, 12-13

Replace, 12-12

Right:

Repair, 12-13

Replace, 12-14

Stop light-tail light and guards, M981, M1064,

replace, 12-57

Storage box, map, M1068:

Repair, page 24-248.3

Replace, page 24-248.2

Storage or shipment, preparation for, 1-8

Stowage box:

Grenade, M106A2, M1064, M125A.2, 24-250

Periscope, M106A2, M1064, M125A2, 24-251

S (cont)

Stowage bracket:

Launch tube, M901A1, replace, 24-271

Mortar base:

Replace, M106A2, 24-256

Replace, M125A2, 24-258

Mortar bridge, and bumper, M106A2, replace,

24-256

Sight extension arm:

M106A2 and M577A2, replace, 24-253

M1064, replace, 24-252.1

Windshield, M106A2, M1064, M577A2,

replace, 24-252

Stowage cover, and brackets, mortar bipod,

M125A2, replace, 24-259

Stowage hooks, and brackets, M113A2, replace,

35-3

Stowage rack:

Radio, left bulkhead, M577A2, M1068,

replace, 24-245

Radio, M106A2, M1064, M125A2, 24-249

Radio, right front, M577A2, 24-242

Radio, right front, M1068, 24-242.1

Wall, M577A2, 24-243

Strainer:

Front bilge pump and, replace, 16-2

Rear bilge pump and, replace, 16-8

Parts, filler cap, M125A2, M106A2, replace,

6-78

Straps, and tarpaulin, MM113A2, M1059,

replace, 35-2

Support, high stow, launcher, M901A1, replace,

24-124

Support arm:

Road wheel, replace, 22-12

Support bracket, smoke generator assembly and,

M1059, replace, 40-6

Suppressor, MX-777B/GRC or MX-7778A/GRC,

transient, replace, 41-4

Switch:

Admittance buzzer, M577A2, M1068, replace,

12-72

Assembly and cables, M8A3/M14 NBC,

M113A2, M1059A2, replace, 39-95

Assembly, cables, M8A3 NBC, M106A2,

M125A2, replace, 39-43

Blower, M577A2, M1068, replace, 17-16

Differential:

High oil temperature, replace, 15-4

Lead, replace, 15-5

Change 4 Index 25
TM 9-2350-261-20-1

Subject, Page Subject, Page

S (cont)

Switch (cont):

Dome light:

Bypass, M577A2, M1068, replace, 12-71

Front, M577A2, M1068, replace, 12-68

Rear, M577A2, M1068, replace, 12-69

Engine:

Coolant temperature, replace, 15-3

Low oil pressure, replace, 15-2

Start, replace, 11-10

Filter assembly, M3 NBC, M106A2, M125A2,

replace, 39-49

Fiber assembly, M3 NBC, M118A2

ambulance, replace, 39-83

Filter, mount bracket, M13 NBC, M577A2,

39-21

Filter, mount bracket, M3 NBC, M577A2,

59-68

Flame detector:

Replace, 32-4

Repair, 32-5

Fuel quantity selector, replace, 17-17

Fuel select, to gage lead, M981, M1064,

replace, 11-20

Generator, field, replace, 9-44

Headlight high beam selector, replace, 12-77

Horn, replace, 11-24

Main light, replace, 11-9

Master, on indicator, does not light, 3-129

Master assembly, replace, 9-13

Neutral, start, replace, 23-53

Panel assembly, master:

Early slave receptacle, all except M577A2,

replace, 9-19

Late slave receptacle, all except M577A3

and M1068, replace, 9-16

Replace, M577A2, M1068, 9-22

Ramp door:

And mount, M577A2, M1068, replace,

12-74

Stop light, and bracket, replace, 12-132

Transmission, high oil, temperature, replace,

15-6

Switch on indicator does not light, master,

3-129

Switch to distribution box wire assembly (ciruit

49 lead), master, M577A2, replace, 9-40

Switch, distribution box master M1068,

replace, 9-49

S (cont)

Switches, instrument panel on-off, replace, 11-7

T

Table:

Left, M577A2, M1068, replace, 24-178

Of contents, ii

Right, forward, M577A2, M1068, replace,

24-175

Right, rearward, M577A.2, M1068, replace,

24-173

Tachometer:

Adapter, and cable, replace, 11-14

Instrument panel, replace, 11-13

Malfunctions, 3-230

Tail light does not operate, service, 3-98

Tail lights do not operate, blackout marker

lights, and/or, 3-93

Tank:

Auxiliary:

And parts, replace, 8-28

Deaeration hoses, replace, 8-32

To coolant pump tube, replace, 8-30

To radiator tube, replace, 8-31

Fog oil, M1059, replace, 40-2

Fuel:

Replace, M981, M1064 only, 6-34

Repair, temporary, M113A2, M1059,

M901A1, M577A2, 6-21

Replace, M577A2, M1068, 6-73

Replace, M113A2, M901A1, M1059, 6-11

Hydraulic:

Repair, 28-17

Replace, 28-15

Strainer, replace, 28-15

Tanks, draining:

M113A2, M901A1, M1059, 6-5

M577A2, M1068, 6-50

M981, M1064, 6-28

Tarpaulin and straps, M113A2 and M1059,

replace, 35-2

Telepost and cover, replace, 17-8

Temperature indicator:

Comes on, transmission oil hi, 3-71

Malfunctions, coolant, 3-144

Temperature switch, transmission oil high,

replace, 15-6

Tension adjuster and mount, track, replace,

22-24

Index 26 Change 4
Subject, Page

TM 9-2350-261-20-1

Subject, Page

T (cont) T (cont)

Tent:

And clamps, M577A2, replace, 24-181

Frame and mounts, M577A2, replace, 24-183

Light assembly, M577A2, replace, 12-76

Terminal blocks TB1 and TB2, inverter housing,

M1068, replace, 40.1-28.1

Thermostat:

Transfer gearcase (cont):

Resilient mount, replace, 19-2

Transient suppressor, MX-7777B/GRC or

MX-7778A/GRC, M901, replace, 44-4

Transmission:

Housing and deaeration elbow, replace, 8-15

Tube, housing to engine coolant, replace, 8-18

And lower accelerator linkage:

Repair, 23-29

Replace, 23-25

Throttle, hand, replace, 23-42

TMDE, and support equipment, repair parts,

special tools, xiii

Tools:

And supplements and special tools/fixtures

list, common, D-1

Fabricated, E-1

TMDE, and support equipment, repair parts,

special, xiii

Hi oil temperature indicator comes on, 3-71

Hose and fittings, oil cooler to, replace, 18-4

Oil filter and element, drain, replace, 18-8

Oil hi temp indicator malfunctions, 3-153

Oil high temperature switch, replace, 15-6

Range selector:

Repair, 23-50

Replace, 23-48

Torque wrench adapters and the conversion

formula, use of, 2-29

Torsion bar:

Anchor, replace, 22-36

Replace, 22-32

Tow cable pad, replace, 24-6

Towing hook, replace, 24-3

Towing pintle:

Repair, 24-4

Replace, 24-4

Towlines, repair, 35-4

Track:

Replace, 22-4

Shaft, to differential, replace, 20-2

Throttle valve linkage, and accelerator,

adjust, 23-34

To oil cooler hose and fittings, replace, 18-2

Vent and filler tube, replace, 18-6

Transmitter, fuel quantity:

Replace, M113A2, M901A1, M1059, 6-9

Replace, M125A2, M106A2, 6-80

Replace, M577A2, M1068, 6-54

Replace, M981, M1064, 6-32

Traversing unit mount and spacer, M901A1,

replace, 24-275

Trim vane:

Control linkage, repair, 24-13

Release:

Shroud and covers:

12 inch (30 cm), replace, 22-2

Tension adjuster and mount, replace, 22-24

Track shoe:

Assembly, and pad, replace, 22-6

Trailer:

Harness, replace, 17-2

Light receptacle wiring harness, replace,

12-18

Lights do not operate, 3-100

Transmission hi oil temp indicator malfunctions,

3-153

Transfer gearcase:

Disassemble/assemble, oil filler, 19-5

Lifting eyebolt, cover, and plug, replace, 19-6

Oil filler, replace, 19-4

Oil level dipstick, tube, and guide, replace,

19-3

Repair, 24-17

Replace, 24-14

Repair, M106A2, M126A2, M577A2, M1068,

M1064, 24-9

Repair, all except M106A2, M125A2, M1064,

M1068, M577A2, 24-11

Replace, 24-8

Tripod stowage brackets, M901A1, replace,

24-272

Troubleshooting, 3-8

How to use, 3-1

Tube:

Auxiliary tank:

To coolant pump, replace, 8-30

To radiator, replace, 8-31

Bulkhead connection to heater:

Fuel inlet hose, 32-23

Replace:

Change 4 Index 27
TM 9-2350-261-20-1

Subject, Page

T (cont) V (cont)

Tube (cont):

M113A2, M1059, 29-24

M106A2, M1064, M125A2, 29-33

M577A2, M1068, 29-40

Cylinder discharge, replace, 42-11

External cable, replace, 42-8

Fuel compartment-to-fuel pump, M106A2,

M125A2, replace, 29-29

Quick disconnect to ramp control valve,

replace, 28-22

Ventilated face mask

Gas filter, M25/M25A1, replace, 39-101

Heater, M26/M25A1, replace, 39-102

Hose assembly, M25/M25A1, replace, 39-99

Orifice connector assembly, NBC equipment,

replace, 39-100

Vertical ammunition rack, M106A2, M125A2,

replace, 24-188

Vertical ammunition rack, M1064, replace,

24-190.1

Ramp control valve to bulkhead connection:

Replace, 28-22

Ramp pump to hydraulic tank strainer,

replace, 28-7

Tube and hose, engine oil cooler,

replace, 8-14

Turret guard:

Repair, 24-210

U

Unit preventative maintenance checks and

services, semiannual (S) operation checks, 3-41

Utility outlet:

Blower, left rear, does not work, M577A2,

3-125

Lead assembly, replace, M577A2, M1068,

17-7

Receptacle:

Circuit breakers, M577A2, M1068, replace,

17-11

Rear, M577A.2, M1068, replace, 17-9

Replace, all except M577A2, M1068, 17-5

Right rear/admittance buzzer works

improperly, M577A2, 3-122.

V

Valve:

Air control, repair, 7-11

Air control cable, repair, 7-13

Auxiliary generator fuel shutoff, M1068,

replace, 28.1-2

Front bilge, replace, 16-7

Muffler extension and, replace, 7-18

Vanes, air pump, 6-135

Vent and filter screen, fuel cap, M981, M1064,

clean, 6-48.1

Vent, hoses, tubes, and fittings, M577A2,

M1068, replace, 6-70

Subject, Page

Vertical fuze rack, M106A2, replace, 24-186

Vision block locks and seals:

Commander’s hatch/cupola cover:

Replace, M113A2, M106A2, M1064,

M125A2, 24-86

Replace, M577A2, M1068, 24-97

Driver’s hatch:

Repair, M901A1, 24-67

Replace, all except M901A1, 24-62

Vision port:

Ramp, M901A1, replace, 25-37

Ramp shield, M901A1, replace, 25-37

Voltage regulator:

Adjust, 100/200 amp generator, 9-38

W

Warnings, summary, a

Welding, repair hull by, 26-1

Wheel, idler, replace, 22-16

Wheel, idler hub, replace, 22-17

Windshield and brackets, replace, 30-2

Windshield stowage bracket, M106A2, M1064,

M125A2, replace, 24-252

Wire rope and pulleys:

Replace, M106A2, M1064, M125A2, 25-31

Replace, all except M106A2, M1064,

M125A2, 25-30

Wiring diagrams:

M106A2, M125A2, FO-4

M113A2, FO-1, FO-2

M577A2, FO-3

M901A1, FO-6

M1064, FO-8

M1068, FO-9 thru FO-11

Wiring harness:

Air box heater, replace, 6-140

Chemical agent, replace 44-6

Coolant pump-to coolant heater, replace,

32-43

Index 28 Change 4
TM 9-2350-261-20-1

Subject, Page

W (cont)

Wiring harness (cont):

Heater, M13 NBC, M577A2, replace, 39-3

Heater, M13 NBC, M1068, replace, 39-72

Radiac, M113A2, M577A2, M1068, replace,

17-13

Right headlight, replace, 12-79

Rear main:

Replace, M106A2, M125A2, 12-106

Replace, M1064, 12-118.1

Subject, Page

W (cont)

Wiring harness (cont):

Replace, M113A2, M1059, M901A1, 12-119

Replace, M577A2, M1068, 12-82

Repair, 14-3

Smoke grenade launcher, M113A2, M1059,

M901A1, replace, 27-3

Suspension lockout, solenoid, replace, 28-76

X Y Z

✩ U.S. GOVERNMENT PRINTING OFFICE: 1997 545-010/60565 Change 4 Index 29 (Index 30 blank)
By Order of the Secretary of the Army:

CARL E. VUONO

General, United States Army

Chief of Staff

Official:

THOMAS F. SIKORA

Brigadier General, United States Army

The Adjutant General

Distribution:

To be distributed in accordance with DA Form 12-37-E, Block No. 1201, Unit maintenance

requirements for TM 9-2350-261-20-1.

* U.S. GOVERNMENT PRINTING OFFICE: 1992 311-831/44373



THE METRIC SYSTEM AND EQUIVALENTS

LINEAR MEASURE SQUARE MEASURE

1 Centimeter = 10 Millimeters = 0.01 Meters= 0.39371 Inches

1 Meter = 100 Centimeters = 100 Millimeters = 39.371 Inches

1 Kilometer = 1000 Meters = 0.621 Miles

WEIGHTS

1 Gram = 0.001 Kilograms = 1000 Milligrams = 0.035 Ounces

1 Kilogram = 1000 Grams = 2.2 Lbs

1 Metric Ton = 1000 Kilograms = 1 Megagram = 1.1 Short Tons

LIQUID MEASURE

1 Milliliter= 0001 Liters = 0.0336 Fluid Ounces

1 Liter = 1000 Milliliters= 33.62 Fluid Ounces

1 Sq Centimeter = 100 Sq Millimeters = 0.155 Sq Inches

1 Sq Meter = 10,000 Sq Centimeters = 10.76 Sq Feet

1 Sq Kilometer = 1,000,000 Sq Meters = 0.386 Sq Miles

CUBIC MEASURE

1 Cu Centimeter = 1000 Cu Millimeters = 0.06 Cu Inches

1 Cu Meter = 1,000,000 Cu Centimeters = 35.31 Cu Feet

TEMPERATURE

APPROXIMATE CONVERSION FACTORS

5/9(° F –32) = °C

212° Fahrenheit IS equivalent to 100° Celsius

90° Fahrenheit is equivalent to 322° Celsius

32° Fahrenheit IS equivalent to 0° Celsius

9/5 °C +32 =°F

TO CHANGE TO MULTIPLY BY

Inches . . . . . . . . . . . . . . . . . . . . . . Centimeters . . . . . . . . . . . . . . 2.540

Feet . . . . . . . . . . . . . . . . . . . Meters . . . . . . . . . . . . . . . . . . . . .0.305

Yards . . . . . . . . . . . . . . . . . Meters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.914

Miles . . . . . . . . . . . . . . . . . . . . . . . . . . . Kilometers. . . . . . . . . .. . . . . . . . . . . 1.609

Square Inches . . . . . . . . . . . .Square Centimeters . . . . . . . . .. . . . . . . . . . . 6.451

Square Feet . . . . . . . . . . . . . . . . . Square Meters . . . . . . . . . . . . . . . . . . . . 0.093

Square Yards . . . . . . . . . . . . . . . . Square Meters . . . . . . . . . . . . . . . . . . 0.836

Square Miles . . . . . . . . . . . . . . . . . . . Square Kilometers . . . . . . . . . . . . . . . . . . . 2.590

Acres. . . . . . . . . . . . . . . . . . . . . . . . Square Hectometers. . . . . . . . . . . . . . . . . . . . . . 0.405

Cubic Feet . . . . . . . . . . . . . . . . . . . . . . . . . . Cubic Meters . . . . . . . . . . . . . . . . . 0.028

Cubic Yards . . . . . . . . . . . . . . . . . Cubic Meters . . . . . . . . . . . . . . . . . . . . . . . 0.765

Fluid Ounces. . . . . . . . . . . . . . . Milliliters . . . . . . . . . . . . . . . . 29.573

Pints . . . . . . . . . . . . . . . . . . . . . . . . Liters . . . . . . . . . . . 0.473

Quarts. . . . . . . . . . . . . . Liters . . . . . . . . . . . . . . . 0.946

Gallons. . . . . . . . . . . . . . . . . . . . . . . Liters. . . . . . . . . . . . . 3.785

Ounces. . . . . . . . . . . . . . . . Grams . . . . . . . . . . . . . . 28.349

Pounds. . . . . . . . . . . . . . . . . . . Kilograms. . . . . . . . . . . . . . . . 0.454

Short Tons. . . . . . . . . . . . . . . . . . . . . . . . . . Metric Tons . . . . . . . . . . . . . . . 0.907

Inch-pounds. . . . . . . . . . . . . . . . . Centimeter-kilograms . . . . . . . . . . . 1. 152

Foot-pounds . . . . . . . . . . . . . . . . . . . . Meter-kilograms . . . . . . . . . . . . . . . . 0.138

Pound-feet . . . . . . . . . . . . . . . . . Newton-meters . . . . . . . . . . . . . . . . . 1.356

Pound-inches . . . . . . . . . . . . . . . . . . . . . . . . . Newton-meters . . . . . . . . . . . . . . . . 0.113

Pounds per Square Inch . . . . . . . . . . . . . . . Kilopascals. . . . . . . . . . . . . . . 6.895

Miles per Gallon . . . . . . . . . . . . . . . . . Kilometers per Liter . . . . . . . . . . . . . . . . . . 0.425

Miles per Hour . . . . . . . . . . . . . . . . . . . Kilometers per Hour . . . . . . . . . . . . . . .. . . . . 1.609

TO CHANGE T O MULTIPLE BY

Centimeters. . . . . . . . . . . . . . . . . . . . . . . . . 

Inches . . . . . . . . . . . . . 0.394

Meters . . . . . . . . . . . . . . . . . . . Feet. . . . . . . . . 3.280

Meters . . . . . . . . . . . . . . . . Yards . . . . . . . . . . . . . . . . . . . . 1.094

Kilometers . . . . . . . . . . . . . . . . . . . . . . . . Miles . . . . . . . . . 0.621

Square Centimeters . . . . . . . . . . . . . . . . . . . . Square Inches . . . . . . . . . . . . . . . . 0.155

Square Meters . . . . . . . . . . . . . . . . . . . . . . . Square Feet . . . . . . . . . . . . . . 10.764

Square Meters . . . . . . . . . . . . . . . . .. Square Yards . . . . . . . . . . . .. . . . . 1.196

Square Kilometers . . . . . . . . . . . . . . . . . Square Miles . . . . . . . . . . . . . . . . 0.386

Square Hectometers . . . . . . . . . . . . . . . . . . . . . . . . . . . . Acres . . . . . . . . . . 2.471

Cubic Meters . . . . . . . . . . . . . . . . . . Cubic Feet . . . . . . . . . . . . . . . . 35.315

Cubic Meters . . . . . . . . . . . . . . . Cubic Yards . . . . . . . . . . . . . . . 1.308

Milliliters . . . . . . . . . . . . Fluid Ounces . . . . . . . . . . . . . . . . 0.034

Liters . . . . . . . . . . . . Pints . . . . . . . . . 2.113

Liters . . . . . . . . . . . . . Quarts . . . . . . . . . . . . . 1.057

Liters . . . . . . . . . . . . Gallons . . . . . . . . . . . . . . . 0.264

Grams . . . . . . . . . . . . Ounces. . . . . . . . . . . . . . . 0.035

Kilograms . . . . . . . . . . . . . . . Pounds . . . . . . . . . . . . . . . 2.205

Metric Tons . . . . . . . . . . . . . . . . . Short Tons . . . . . . . . . . . . . . . . 1. 102

Centimeter-kilograms . . . . . . . . . . . . . . . . . . .

Inch-pounds . . . . . . . . . . 0.868

Meter-kilograms . . . . . . . . . . . . . . .. . . Foot-pounds . . . . . . . . . . . . . . 7.233

Newton-meters . . . . . . . . . . . . . . . . Pound-feet . . . . . . . . . . . . 0.738

Newton-meters . . . . . . . . . . . . . . . . . . . . . . . Pound-inches . . . . . . . . . . . . . . . . 8.851

Kilopascals . . . . . . . . . . . . . . . . Pounds per Square inch . . . . . . . . . . . . . . . 0.145

Kilometers per Liter . . . . . . . . . . . .. . . . . . . Miles per Gallon . . .. . . . . . . . . . 2.354

Kilometers per Hour . . . . . . . . . . . . . . Miles per Hour . . .. . . . . . . . . . 0.621
PIN: 058066-004