Service Manual

H1F 060/080/110/160/210/250
H1F Bent Axis Fixed Displacement Motor

www.danfoss.com

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250

Revision history

2 | © Danfoss | April 2024

Table of revisions
Date

ChangedRev

April 2024

Added information for 60cc

0201

December 2023

Updated title

0102

November 2023

First edition - and next various changes.

0101

AX465363259664en-000201

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Contents
Introduction
H1F About this manual...................................................................................................................................................................5
Warranty.............................................................................................................................................................................................. 5
H1F General instructions............................................................................................................................................................... 5
Safety precautions............................................................................................................................................................................5
H1 general information
About the H1F motors.................................................................................................................................................................... 7
H1F pictorial diagram......................................................................................................................................................................8
H1F system schematic.................................................................................................................................................................... 9Technical specifications
H1F General specifications......................................................................................................................................................... 10
H1F Physical properties............................................................................................................................................................... 10
H1F Operating Parameters......................................................................................................................................................... 11
H1F Required inlet pressure table (for cylinder block filling).........................................................................................11
H1F Open circuit requirements.................................................................................................................................................12
Fluid specifications........................................................................................................................................................................13
Determination of nominal motor size.................................................................................................................................... 13
Operation
H1F Shaft rotation direction.......................................................................................................................................................14
H1F Loop flushing shuttle spool...............................................................................................................................................14
H1F loop flushing relief valve.................................................................................................................................................... 15
Speed sensor................................................................................................................................................................................... 16
H1F speed sensor position.................................................................................................................................................... 16
H1F target ring...........................................................................................................................................................................16
Operating parameters
H1F output speed.......................................................................................................................................................................... 17
H1F system pressure.....................................................................................................................................................................17
Case pressure...................................................................................................................................................................................17
External shaft seal pressure........................................................................................................................................................18
Temperature.................................................................................................................................................................................... 18
Fluid and filter maintenanceFluid and filter recommendations........................................................................................................................................... 19
Pressure measurements
H1F Ports and gage information.............................................................................................................................................. 20
Initial startup procedures
Procedure..........................................................................................................................................................................................21
Troubleshooting
Overview........................................................................................................................................................................................... 23
H1F Sluggish operation............................................................................................................................................................... 23
System operating hot...................................................................................................................................................................23
Excessive noise or vibration....................................................................................................................................................... 23
Motor operates normally in one direction only..................................................................................................................24
Improper output speed............................................................................................................................................................... 24
H1F Low output Torque.............................................................................................................................................................. 24
Required tools and standard procedures
Minor repair
Shaft seal........................................................................................................................................................................................... 26
H1F Removal...............................................................................................................................................................................26
H1F Assembly.............................................................................................................................................................................26
Replace speed sensor................................................................................................................................................................... 28
H1F Speed Sensor Removal.................................................................................................................................................. 28
H1F speed sensor reassembly..............................................................................................................................................28
Loop flushing spool.......................................................................................................................................................................29
H1F Loop Flushing Spool Removal.................................................................................................................................... 29© Danfoss | April 2024

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Contents
H1F Loop Flushing Reassembly...........................................................................................................................................29
H1F Loop Flushing Charge Relief Removal...........................................................................................................................29
Torque chart
H1F Fasteners, plugs with torque chart.................................................................................................................................30

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Introduction
H1F About this manualThis manual includes information for the installation, maintenance, and minor repair procedures for H1
bent axis fixed motors. It includes a description of the unit and its individual components,
troubleshooting information, and minor repair procedures.
Performing minor repairs may require removal from the vehicle/machine. Thoroughly clean the unit
before beginning maintenance or repair activities. Since dirt and contamination are the greatest enemiesof any type of hydraulic equipment, follow cleanliness requirements strictly. This is especially importantwhen changing the system filter and when removing hoses or plumbing.
Only Danfoss global service partners (GSPs) are authorized to perform major repairs.Danfoss trains Global
Service Partners and certifies their facilities on a regular basis. You can locate your nearest service partnerat www.danfoss.com > Contact us > Danfoss sales and services > Distributor and service partners
Warranty
Performing installation, maintenance, and minor repairs according to the procedures in this manual will
not affect your warranty. Major repairs requiring the removal of a unit’s rear cover voids the warranty
unless done by a Danfoss Global Service Partner.
H1F General instructions
When repairing H1 fixed displacement closed circuit motors follow these general procedures:
Remove theunit

Chock the wheels on the vehicle or lock the mechanism to inhibit movement. Prior toperforming repairs, remove the unit from the vehicle/machine. Be aware thathydraulic fluid may be under high pressure and/or hot. Inspect the outside of the
motor and fittings for damage. Cap hoses after removal to prevent contamination.

Keep it clean

Cleanliness is a primary means of assuring satisfactory motor life, on either new or
repaired units. Clean the outside of the motor thoroughly before disassembly. Takecare to avoid contamination of the system ports. Cleaning parts with a clean solvent
wash and air drying is usually adequate. Keep all parts free of foreign materials andchemicals. Protect all exposed sealing surfaces and open cavities from damage andforeign material.

Lubricatemoving parts

During assembly, coat all moving parts with a film of clean hydraulic oil. This assuresthat these parts are lubricated during start-up.

Replace all Orings andgaskets

Danfoss recommends you replace all O-rings and gaskets during repair. Lightly
lubricate O-rings with clean petroleum jelly prior to assembly.

Secure the unit

For repair, place the unit in a stable position with the shaft pointing downward.
Secure the motor while removing and torquing components and fasteners.

Safety precautions
Always consider safety precautions before beginning a service procedure. Protect yourself and othersfrom injury. Take the following general precautions whenever servicing a hydraulic system.
Unintended machine movement

W Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable/disconnect the mechanism
while servicing.
© Danfoss | April 2024

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Introduction
Flammable cleaning solvents

W Warning
Some cleaning solvents are flammable. To avoid possible fire, do not use cleaning solvents in an area
where a source of ignition may be present.
Fluid under pressure

W Warning
Escaping hydraulic fluid under pressure can have sufficient force to penetrate your skin causing serious
injury and/or infection. This fluid may also be hot enough to cause burns. Use caution when dealing withhydraulic fluid under pressure. Relieve pressure in the system before removing hoses, fittings, gauges, orcomponents. Never use your hand or any other body part to check for leaks in a pressurized line. Seek
medical attention immediately if you are cut by hydraulic fluid.
Personal safety

W Warning
Protect yourself from injury. Use proper safety equipment, including safety glasses, at all times.
Hazardous material

W Warning
Hydraulic fluid contains hazardous material. Avoid prolonged contact with hydraulic fluid. Always
dispose of used hydraulic fluid according to environmental regulations.

6 | © Danfoss | April 2024

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
H1 general information
About the H1F motors
Series H1 fixed displacement motors are bent axis design, incorporating spherical pistons.
These motors are designed to be combined with other products in closed or open circuit systems totransfer hydraulic power.
High performing 32 degree maximum angle, creates opportunities to easily improve the machine
performance for:• Multi-motor applications requiring optimized work and transport modes (i.e. wheel loader, mobile
crane, drill rigs, winches, harvestors).
SAE, Cartridge and DIN flange with axial, side or twin high pressure port configurations are available.
Loop flushing is also available with these options.
Speed sensor options are available to cover all frame sizes and flange styles.
They are capable of sensing the following, all in one package:
Speed

•
•
•

© Danfoss | April 2024

Direction (Group "J": option "S" and option "B")
Temperature (Group "J": options "S" and option "B")AX465363259664en-000201 | 7

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
H1 general information
H1F pictorial diagram

Working loop A (Low pressure) and charge pressure
Working loop B (High pressure)
Servo pressure
Case drain
Suction

1. Bent Axis Fixed Displacement Motor
2. Axial Piston Variable Displacement Pump
3. Electric Displacement Control (EDC)
4. Charge Pump
5. Charge Check / High Pressure Relief Valve
6. Loop Flushing Valve
7. Pressure Limiter Valve
8. Charge Pressure Relief Valve
9. Servo Cylinder

8 | © Danfoss | April 2024

10. Charge Pressure Filter
11. Heat Exchanger
12. Heat Exchanger Bypass Valve
13. Pump Swashplate
14. Input Shaft
15. Output Shaft
16. Reservoir
17. to Motor Case

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
H1 general information
H1F system schematic
System schematic H1 pump and H1F motor
M14

M6

1

2

R2

R1

C2

C1

M3 L1
F00B

L2

L2 MA

L3

N

A A

F00A

n

M5
CW
L1
M4

B B
S L3

L4

MB

max. 3 bar[43.5 psi]

The schematic above shows the function of a hydrostatic transmission using an H1 axial variable displacement pump with electric
proportional displacement control (EDC) and an H1 fixed displacement motor with integrated loop flushing device.

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Technical specifications
H1F General specifications
General specifications
DesignPiston motor with fixed displacement bent axis design

Direction of rotation

Bi-directional

Pipe connections

Main pressure ports: ISO split flange boss
Remaining ports: SAE straight thread O-ring boss

Recommended installation

Discretionary, the housing must always be filled with hydraulic fluid

H1F Physical properties
Physical properties
Size
Features

Unit
060

080

Displacement (max)cm3[in3]60.1 [3.67]

80.8 [4.93]

l/min[US gal/min]

330 [87.2]

400 [105.7]

Theoretical torqueat max. displacementN•m/bar[lb•in/1000 psi]

0.96 [583]1.27 [777]

Theor. corner power at rated speed and max.
working pressure (∆p = 450 bar [6527 psi])

kW [hp]Mass moment of inertia of rotating components

kg•m2[slug•ft2]

0.0031[0.0023]

Case volume

l [US Gal]

0.8 [.21]

Theoretical flow at max.
displ.

at max. speed

248 [332.6]

330 [442.5]
0.0063[0.0047]

Weight dry
Configuration

Size
060

080

SAE

-

22.1 kg [48.7 lb]

DIN

18.2 kg [40.1 lb]

22.9 kg [50.5 lb]

Cartridge

18.5 kg [40.8]-

Mounting flange
Configuration

10 | © Danfoss | April 2024

Size
060

080

SAE ISO 3019/1-

127-4 (SAE C) 4-bolt

DIN ISO 3019/2, B4

Flange 125 B4 HL 4-bolt

Cartridge

Pilot dia 160mm, 2-bolt (200 dist)
M16

140 HL 4-bolt-

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Technical specifications
Customer ports
Configuration Size
060

080

Axial and radial1)

DN19 typ 1

DN25 typ 1

L1, L22)M22x1,5

M22x1,5

Bleed port3)

M14x1,5

M14x1,5

1) Split flange Boss per ISO6162, 40 MPa series
2) Metric O-ring boss3) Countersink may be deeper that specified in the standard.

H1F Operating Parameters
Output Speed
Size
Output Speed

Displacement

Unit
060

080

Rated

Maximum 32°

min-1

5000

4500

Maximum

Maximum 32°

(rpm)

5500

5000

System and Case Pressure, Ambient Temperature
Parameter
System pressure

Case pressure

Ambient temperature1)

All sizes
Maximum working delta

450 bar [6527 psi]

Maximum working abs

480 bar [6962 psi]

Max delta

480 bar [6962 psi]

Max abs

510 bar [7397 psi]

Min low loop

7.5 bar [109 psi]

Rated

3 bar [44 psi]

Maximum

5 bar [73 psi]

Minimum

0.3 bar [4 psi]

Maximum

70 °C [158 °F]

Minimum-40 °C [-40 °F]

1) Air temperature close to the unit.

H1F Required inlet pressure table (for cylinder block filling)
60cc / 80cc
Speed (RPM)

Pressure (Bar)

900

2

1400

5

2100

10

2800

15

3200

20

4000

30

This pressure ensures that the cylinder block will be properly filled and that there is no pulling between
piston and shaft.
The required pressure is 0 bar at 0 rpm and increases with rpm.
© Danfoss | April 2024

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Technical specifications
For open circuit applications it is not allowed to operate above rated speed. For closed circuit
applications operating between rated and max. speed, please contact your local Danfoss Power Solutions
representative.

H1F Open circuit requirements
H1 bent axis motors may be used in Open Circuit (OC) applications.
Since loop flushing is typically not used in OC-applications it is essential to provide sufficient cooling
capacity. This can be done by motor case cross flushing. The flow rate needs to be adjusted to the coolingdemand.
The highest case drain outlet port must always be used for the return flow to the cooler or tank.
The motor case and the working lines connected to Port A and B must be kept full of oil at all times,
whether in a dynamic or static condition.
The plumbing must not allow the oil to drain down and be replaced with air in the rotating group.
The minimum pressure in the inlet port and the outlet port, must be equal or higher as shown in thetables.H1F Required inlet pressure table (for cylinder block filling) on page 11 .
Counter balance valves may be used to maintain the minimum pressure requirements. Danfoss meter-in /meter-out PVG technology may be used. Check valves and sufficient charge pressure supply are also
possible.
At no time shall the motor be allowed to operate above the rated speed limits. If flow limiter valves areused, they must be selected accordingly. This ensures proper function under all conditions.
Valve blocks, such as counter balance valves attached to the inlet and/or outlet ports, must not interferewith any part of the motor. A review of the outline drawings or appropriate 3D models must becompleted.

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Technical specifications
Fluid specifications
Fluid specifications
Features

All sizesUnit

7 [49]

Minimum intermittent
Viscosity

mm2/s
[SUS]

Recommended range

Temperature range1)2)12-80 [66-366]

Maximum intermittent

1600 [7416]

Minimum-40 [-40]
°C
[°F]

Rated

104 [220]
115 [240]

Maximum intermittent-

Required cleanliness per ISO 4406

22/18/13
β15-20 = 75 (β10 ≥ 10)

Efficiency (charge pressure filtration)
β-ratio

Cleanliness and Filtration
Efficiency (suction / return line filtration)
Recommended inlet screen mesh sizeµm

β35-45 = 75 (β10 ≥ 2)
100 – 1251) At the hottest point, normally case drain port.
2) Minimum: cold start, short term t<3 min, p<50 bar, n<1000 rpm.

Determination of nominal motor size
Based on SI units

Based on US units

Qe =Vg • n1000 • v

Me =Vg • p •
20 •

Pe =

Me • nQ • p•
= e
600
9550

n =

Qe • 1000 •
Vg

mh

t

v

Where:

Vg • n231 • vMe =Vg • p •2•

Pe =Vg • n • p •396 000n =Qe • 231 •
Vg

mh

t

v

Where:

Qe

Input flow (l/min)

Qe

Input flow [US gal/min]Me

Output torque (N•m)

Me

Output torque [lb•in]Pe

Output power (kW)Pe

Output power [hp]nSpeed (min-1)nSpeed [rpm]Vg

Motor displacement per rev. (cm3/rev)

Vg

Motor displacement per rev. [in3/rev]

phigh High pressure (bar)© Danfoss | April 2024

Qe =phigh High pressure [psi]plow

Low pressure (bar)plow

Low pressure [psi]∆pHigh pressure minus Low pressure (bar)∆pHigh pressure minus Low pressure [psi]ηvMotor volumetric efficiency

ηv

Motor volumetric efficiency

ηmhMechanical-hydraulic efficiency

ηmhMechanical-hydraulic efficiency

ηtMotor total efficiency (ηv • ηmh)ηt

Motor total efficiency (ηv • ηmh)

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Operation
H1F Shaft rotation direction
Shaft rotation direction is determined with a view from the shaft end.

CCW

CW

Flow into port A

Clockwise

Flow into port B

Counterclockwise

H1F Loop flushing shuttle spool
An integral loop flushing shuttle spool is used to separate system A and system B pressures.
System delta pressure will cause the shuttle spool to shift, allowing the low side system pressure to flow
to the loop flushing relief valve.
L2

A

Legend:A

System loop A

B

System loop B

LFRV

to loop flushing relief valve

B
P003 437

W Warning
Unintended vehicle or machine movement hazard.
Excessive motor loop flushing flow may result in the inability to build required system pressure in someconditions. Maintain correct charge pressure under all conditions of operation to maintain pump control
performance in hydrostatic systems.

14 | © Danfoss | April 2024

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Operation
H1F loop flushing relief valve
The loop flushing relief valve is incorporated into all H1 motors used in closed circuit applications toremove fluid from the low pressure side of the system circuit to meet cooling requirements.
The loop flushing relief valve is also used to facilitate the removal of contaminants from the loop.
The loop flushing valve is equipped with an orificed charge pressure relief valve designed with a cracking
pressure of 16 bar [232 psi].
Valves are available with several orifice sizes to meet the flushing flow requirements of all system
operating conditions.
A loop flushing defeat option is available.
Loop flushing relief valve schematic

Loop flushing relief valve (cross section)

L2

A

P003 491

B
P003 487

Loop flushing relief valve sizes
5

40 bar

10

15

20

30

40
50

30 barY

20 bar

10 bar

0

10

20

30

X

© Danfoss | April 2024

40

50

60
P006 034

X

Loop flushing flow (l/min)Y

Low system pressure minus case pressure (bar)AX465363259664en-000201 | 15

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Operation
Speed sensor
The speed sensor is designed for rugged outdoor, mobile or heavy industrial speed sensing applications.
The detection of the speed is contactless and does not need any calibration or adjustments.
For more information, see Speed and Temperature Sensor, Technical Information, BC152886482203.
H1F speed sensor position
Sensor position in cartridge housing
Cartridge housing

H1F target ring
Speed (target) rings vary according to the diameter of the cylinder block or shaft on which they are
installed. The number of teeth is shown in the table below.
The number of speed (target) ring teeth
H1F size

060

080

Teeth

71

78

Excessive axial shaft loading during installation of motors with speed sensors and cartridge housingsmust be avoided. High axial shaft loads during installation of motors can lead to a movement of the shaft
and damage the speed sensor.

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Operating parameters
H1F output speed
Start and low speed stability. The motor produces maximum starting torque at maximum
displacement. Stable operation can be achieved at 15–34 rpm, ± 5 %, depending on system pressure, inapplications that require low speed stability. Motor output speed becomes more stable as speed
increases.
Rated speed is the highest output speed recommended at full power condition. Operating at, or below
this speed will yield satisfactory product life. Do not exceed rated speed in open circuit applications.
Maximum speed is the highest operating speed permitted. Exceeding maximum speed reduces the
product life and can cause loss of hydrostatic power and dynamic braking capacity. Never exceed the
maximum speed limit under any operating conditions.
Operation between rated and maximum speed is reserved for intermittent operation (seeH1F Operating
Parameters on page 11 ) not to exceed 10 minutes durations, 2% of duty cycle based load-life, and 310
bar system delta pressure. Speed above rated are anticipated to occur during downhill braking (negative
power). Contact factory for any operation above Rated speed when negative power is not involved.
During hydraulic braking and downhill conditions, the prime mover must be capable of providing
sufficient braking torque in order to avoid pump over speed. This is especially important to consider forturbocharged and Tier 4 engines.

W Warning
Unintended vehicle or machine movement hazard.
Exceeding maximum speed may cause a loss of hydrostatic drive line power and braking capacity. You
must provide a braking system, redundant to the hydrostatic transmission, sufficient to stop and hold thevehicle or machine in the event of hydrostatic drive power loss. The braking system must also be
sufficient to hold the machine in place when full power is applied.

H1F system pressure
System pressure is the differential pressure between high pressure system ports. It is the dominantoperating variable affecting hydraulic unit life. High system pressure, which results from high load,
reduces expected life. Hydraulic unit life depends on the speed and normal operating, or weighted
average, pressure that can only be determined from a duty cycle analysis.
Application pressure is the high pressure relief or pressure limiter setting normally defined within theorder code of the pump. This is the applied system pressure at which the driveline generates the
maximum calculated pull or torque in the application.
Maximum working pressure is the highest recommended application pressure. Maximum working
pressure is not intended to be a continuous pressure. Propel systems with application pressures at, or
below, this pressure should yield satisfactory unit life given proper component sizing.
Maximum pressure is the highest allowable application pressure under any circumstance. For
applications which are above the maximum working pressure, please contact Danfoss
Minimum pressure must be maintained under all operating conditions to avoid cavitation.
All pressure limits are differential pressures referenced to low loop (charge) pressure. Subtract the low
loop gauge pressure from the high loop gauge pressure readings to compute the differential.
Summing pressure is the sum of both the low and high loop pressures. Summing pressure above 30 bar[435 psi] guarantees reliable use within the rated speed.
Case pressure
Under normal operating conditions, the rated case pressure must not be exceeded. During cold start,case pressure must be kept below maximum intermittent case pressure. Size drain plumbing accordingly.
© Danfoss | April 2024

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Operating parameters

C Caution
Possible component damage or leakage.
Operation with case pressure in excess of stated limits may damage seals, gaskets, speed sensors and/or
housings, causing external leakage. Performance may also be affected since charge and system pressures
are referenced to case pressure.

External shaft seal pressure
In certain applications, the output shaft seal may be exposed to external pressures. The shaft seal isdesigned to withstand an external pressure up to 0.25 bar [3.6 psi] above the case pressure. The casepressure limits must also be followed to ensure the shaft seal is not damaged.
Temperature
The high temperature limits apply at the hottest point in the transmission, which is normally the motor
case drain. The system should generally be run at or below the published rated temperature.
The maximum intermittent temperature is based on material properties and should never be
exceeded.
Cold oil will generally not affect the durability of the transmission components, but it may affect theability of oil to flow and transmit power. Therefore, temperatures should remain 16 °C [30 °F] above thepour point of the hydraulic fluid.
The minimum temperature relates to the physical properties of component materials.
Size heat exchangers too keep the fluid within these limits. Danfoss recommends testing to verify thatthese temperature limits are not exceeded.

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Fluid and filter maintenanceFluid and filter recommendations
To ensure optimum life, perform regular maintenance of the fluid and filter. Contaminated fluid is themain cause of unit failure. Take care to maintain fluid cleanliness when servicing.
Check the reservoir daily for proper fluid level, the presence of water, and rancid fluid odor. Fluid
contaminated by water may appear cloudy or milky or free water may settle in the bottom of thereservoir. Rancid odor indicates the fluid has been exposed to excessive heat. Change the fluid
immediately if these conditions occur. Correct the problem immediately.
Inspect vehicle for leaks daily.
Change the fluid and filter per the vehicle/machine manufacturer’s recommendations or at theseintervals. We recommend first fluid change occur at 500 hours of operation. Change the fluid more
frequently if it becomes contaminated with foreign matter (dirt, water, grease, etc) or if the fluid issubjected to temperature levels greater than the recommended maximum.
Fluid and filter change interval
Reservoir typeMax oil change interval

Sealed2000 hours

Breather

500 hours

C Caution
High temperatures and pressures accelerate fluid aging. This may require more frequent fluid changes.
Change filters when changing fluid or when the filter indicator directs. Replace all fluid lost during filter
changeW Warning
Hydraulic fluid contains hazardous material. Avoid contact with hydraulic fluid. Always dispose of usedhydraulic fluid according to state, and federal environmental regulations. Never reuse hydraulic fluid.

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Pressure measurements
H1F Ports and gage information
The following drawing with accompanying table show the port locations and gauge sizes needed for
installation.
Ports locations

Axial Ported Endcap

Radial Ported Endcap
System split flange boss ports, A/B: Code 62 per ISO 6162, Type 1
Port

Size 060

Size 080

A, B

3/4 in; Thread: M10 x 1.5
min. 18 mm [0.71 in]

1 in; Thread: M12 x 1.75
min. 24 mm [0.94 in]Ports and gauge Information

20 | © Danfoss | April 2024

Port

Size 060/080

Pressure obtained

L1, L2

M22 x 1.5
Wrench (int. hex): 17 mm

10 bar [145 psi]
Case drain

L3

M14 x 1.5
Wrench (int. hex): 12 mm

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H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Initial startup procedures
Procedure

W WarningThis service procedure may require disabling the vehicle / machine (raising the wheels off the ground,
disconnecting work function) while performing, to prevent injury to the technician and bystanders. Take
the necessary safety precautions.
Always follow this procedure when starting-up a new H1 installation or when the motor has been
removed.
1. Before installing the motor, inspect the units for possible damage incurred during shipping andhandling.
2. Make certain all system components (reservoir, hoses, valves, fittings, heat exchanger, and so forth)
are clean before filling with fluid.
3. Fill the reservoir with recommended hydraulic fluid. Pass this fluid through a 10 micron (nominal, no
bypass) filter before it enters the reservoir.
4. Fill the inlet line leading from the reservoir to the pump.
5. Check inlet line for properly tightened fittings. Make sure the inlet line is free of restrictions and airleaks.
6. Fill the motor and pump housings with clean hydraulic fluid before start up. Fill by pouring filtered oil
into the upper case drain port.

C Caution
Never start the prime mover unless the motor and pump housings are filled completely with clean
hydraulic fluid.
7. For closed loop systems, install a 0-60 bar [0-1000 psi] pressure gauge in the charge pressure gauge
port of the pump to monitor the charge pressure during start-up.
For open circuit systems, use gauges in system ports.
8. Disconnect any external control input signal from the pump control until after initial start-up. This
ensures that the pump remains in its neutral position.
9. Jog (slowly rotate) prime mover until charge pressure starts to rise.
10. Start the prime mover and run at the lowest possible speed until charge pressure builds.

W Warning
Do not start the prime mover unless the pump is in neutral position (swash plate at 0° angle). Take
necessary precautions to prevent machine movement in case pump is actuated (in stroke) duringinitial start-up.
If necessary, bleed excess air from the high pressure lines through the high pressure system gauge
ports.
11. Once charge pressure is established, increase to normal operating speed. Charge pressure should be
as indicated in the pump model code. If charge pressure is low, shut down and determine cause.

C Caution
Low charge pressure may affect ability to control the machine.
12. Shut down the prime mover.
13. Connect the external control input signal.
14. Reconnect the machine function if disconnected earlier.
15. Start the prime mover, checking to ensure the pump remains in neutral.
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AX465363259664en-000201 | 21

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Initial startup procedures
16. Check for forward and reverse machine operation, with the prime mover at normal operating speed.
Charge pressure may decrease slightly during forward or reverse operation.
17. Continue to cycle slowly between forward and reverse for at least five minutes.
18. Shut down prime mover.
19. Remove gauges. Replace plugs at the gauge ports.
20. Check reservoir level. Add filtered fluid if needed.
The motor/transmission is now ready for operation.

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Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Troubleshooting
Overview
This section provides general steps to follow if you observe undesirable system conditions. Follow thesteps until you solve the problem. Some of the items are system specific. Always observe the safety
precautions in the Introduction section.

W Warning
Unintended movement of the machine or mechanism may cause injury to the technician or bystanders.
To protect against unintended movement, secure the machine or disable/disconnect the mechanism
while servicing.

H1F Sluggish operation
Check
1.

Internal leakage

Cause

Corrective action

Excessive leakage will cause lower charge pressure
and affect performance.

Install loop flushing defeat option and measure caseflow. If case flow is excessive, motor may require major
repair. Contact your Danfoss authorized service
center.

Cause

Corrective action

System operating hot
Check
1.

Oil level

Insufficient hydraulic fluid may cause overheating.

Fill reservoir to proper level.

2.

Heat exchanger

Blocked heat exchanger or low air flow may cause
system overheating.

Check temperature upstream and downstream of heatexchanger. Clean, repair, or replace heat exchanger ifnecessary.

3.

Loop flushing flow

Restricted orifice in loop flushing cartridge reduces Measure case drain flow. Clean or replace orificeflow.
cartridge.

4.

Loop flushing shuttle

Loop flushing shuttle may be sticking in one
direction.

Ensure shuttle moves freely in its bore.

5.

Air in system

Entrained air generates heat under pressure

Look for foam or bubbles in reservoir. Check for leaks
on inlet side of charge pump.

6.

Internal leakage

Excessive internal leakage may overheat thesystem.

Install loop flushing defeat option and monitor caseflow. If case flow is excessive, motor may require major
repair. Contact your Danfoss authorized service
center.

Cause

Corrective action

Excessive noise or vibration
Check
1.

Oil level in reservoir

Insufficient hydraulic fluid may cause cavitation.

Fill reservoir to proper level.

2.

Air in system

Air bubbles may lead to cavitation.

Look for foam or bubbles in reservoir. Check for leaks
on inlet side of charge pump.

3.

Shaft coupling

Loose shaft coupling may create excess noise.

Replace loose shaft coupling. Replace or repair motor
if shaft splines show excessive wear.

4.

Shaft alignment

Misaligned shafts may create excessive noise andvibration and can damage motor.

Correct shaft misalignment.

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AX465363259664en-000201 | 23

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Troubleshooting
Motor operates normally in one direction only
Check
1.

Charge pressure

Cause

Corrective action

If charge pressure is low in one direction, the loop
flushing shuttle spool may be sticking to one side.

Measure charge pressure in forward and reverse. If
pressure drops significantly lower in one direction,
inspect and repair loop flushing shuttle spool.

Cause

Corrective action

Improper output speed
Check
1.

Oil level in reservoir

Insufficient hydraulic fluid may reduce systemefficiency.

Fill reservoir to proper level.

8.

Internal leakage

Excess internal leakage may cause lower chargepressure and affect motor performance including
output speed.

Install loop flushing defeat option and measure caseflow. If case flow is excessive, motor may require major
repair. Contact your Danfoss authorized service
center.

Cause

Corrective action

Excess internal leakage may cause charge pressure
to decay, reducing output torque.

Install loop flushing defeat option and monitor caseflow. If case flow is excessive, motor may require major
repair. Contact your Danfoss authorized service
center.

H1F Low output Torque
Check
8.

Internal leakage

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Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Required tools and standard procedures
Required tools
The service procedures described in this manual can be performed using common mechanic’s handtools. Special tools, if required, are shown. When testing system pressures, calibrate pressure gauges
frequently to ensure accuracy. Use snubbers to protect gauges.
Standard procedures

C Caution
Contamination can damage internal components and void the manufacturer’s warranty. Take
precautions to ensure system cleanliness when removing and reinstalling system lines
1. With the prime mover off, thoroughly clean all dirt and grime from the outside of the motor. Ensure
the surrounding areas are clean and free of contaminants such as dirt and grime.
2. If removing the motor, tag each hydraulic line connected to the motor. If you disconnect hydrauliclines, plug each open port to keep dirt and contamination out of the motor.
3. Inspect the system for contamination. Look at the hydraulic fluid for signs of system contamination,such as oil discoloration, foam in the oil, sludge, or small metal particles.
4. Remove the motor as a single unit.

C Caution
Be careful not to damage solenoids and electrical connections when using straps or chains to remove
motor from machine.
5. Perform motor function test.
6. Before re-installing the motor on the machine, drain the system, flush all lines, replace all filters, andfill with new hydraulic fluid.

© Danfoss | April 2024

AX465363259664en-000201 | 25

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Minor repair
Shaft seal
H1F Removal
1. Using snap ring pliers, remove retaining ring (G0030).
2. Pull front cover (G0025). Be careful not to damage the shaft or seal bore when removing. Discard oring.
3. Press shaft seal (G0020) out of front cover, discard seal.
Inspection
Inspect retaining ring for wear or damage. Replace if necessary. Inspect shaft for wear or groove at sealarea.
H1F Assembly
1. Lubricate inside diameter of new seal.
2. Using seal installation tool, press seal into front cover bore.
3. Install o-ring on front cover o-ring groove, lubricate o-ring (G0080).
4. Cover the shaft splines with shaft cover or packing tape to avoid damaging the seal during
installation.
5. Install front cover (G0025) into housing (G0010).
6. Using snap pliers, install retaining ring ((G0030).
7. Press front cover and retaining ring into housing until retaining ring snaps into its groove.
If not using seal installation tool: Do not press seal beyond snap-ring groove. Stop pressing just when
you have room to install the retaining ring into the bore. Pressing the seal and snap-ring together
ensures proper installation depth. Using the seal installation tool prevents pressing the seal too
deeply.
Shaft seal

26 | © Danfoss | April 2024

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Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Minor repair
110/160/210/250 - Seal installation tool dimensions, 060/080 - Seal installation tool dimensions
100 mm
[3.94 in]180 mm
[7.09 in]

150 mm
100 mm [5.90 in][3.94 in]

69 mm 58 mm[2.6 in] [2.3 in]

82 mm[3.15 in]

56 mm 48 mm[2.2 in] [1.9 in]

70 mm[2.76 in]45°

45°
+ 0.105.15 mm - 0.0[0.20 in + -0.004
0.0 ]© Danfoss | April 2024

5 mm
[0.2 in]+ 0.10P107 738E

5.4 mm - 0.0[0.21 in + -0.004
0.0 ]

5 mm
[0.2 in]

AX465363259664en-000201 | 27

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Minor repair
Replace speed sensor
H1F Speed Sensor Removal
1. Using a 5 mm internal hex wrench, remove screw (J0020).
2. Remove speed sensor (J0010).
3. Discard O-ring (J0041).
H1F speed sensor reassembly
Speed sensor assembly

J0010

J0020

*J0041

1. Lubricate and install new O-ring (J0041).
2. Install speed sensor (J0010).
3. Install screw (J0020) using a 5 mm internal hex wrench with torque to 8 N•m [6 lbf•ft].

28 | © Danfoss | April 2024

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Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Minor repair
Loop flushing spool
H1F Loop Flushing Spool Removal
1. Remove plugs (K0040 & K0050) using a 24 mm hex wrench.
2. Remove and discard O-rings (QK040 & QK050).
3. Use a magnet to remove springs (K0020) and spool (K0010).
Inspection
Clean and inspect spool (K0010). If spool is damaged or worn replace it. Replace springs if they arecracked or bent.
H1F Loop Flushing Reassembly
Loop flushing reassembly
K0040*QK040

K0010

K0050
*QK0501. Lubricate and install spool (K0010).
2. Lubricate and install springs (K0020).
3. Lubricate and install new O-rings (QK040 & QK050).
4. Install plugs (K0040 & K0050) using a 24 mm hex wrench with torque to 67 N•m [49 lbf•ft].
H1F Loop Flushing Charge Relief Removal
1. Using a 24 mm hex wrench remove valve (L00**)
2. Remove and discard O-ring (L0150).
Do not disassemble valve. If you suspect malfunction, replace valve.

© Danfoss | April 2024

AX465363259664en-000201 | 29

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Torque chart
H1F Fasteners, plugs with torque chartPort, plug and fasteners (with radial ported endcap)
System Port B(System Port A
on reverse side)
K0040
G0061
L1

G0061
L1

L00**

System Port A(System Port B
on reverse side)

K0050

G0061
L1

F0120

J0010

G0060
L2

J0010

J0020

G0080
L3

G0080
L3

G0060
L2

Port, plug and fasteners (with axial ported endcap)

K0040

G0061
L1

G0061
L1

L00**

K0050

SystemPort B

SystemPort A

F0120

J0010

G0060
L2

J0020

J0010

G0080
L3

G0080
L3

G0060
L2

Fastener size and torque chart
Options

Frame size

Description

Wrench size

TorqueJ0020

All

Speed sensor screw

5 mm internalhex

8 N•m [6 lbf•ft]

F0120

080

Endcap screw

10 mm internalhex

111 N•m [82lbf•ft]

F0120

060

Endcap screw

8 mm internalhex

75 N•m [55 lbf•ft]

Plug size and torque chart

30 | © Danfoss | April 2024

Item

Frame size

O-ring plug

Wrench size

TorqueF0160

060/080

9/16-18 UNF

1/4 internal hex

40 N•m [30 lbf•ft]

G0080

060/080

M14 - 1.5 (SAE and DIN flange)

12 mm internalhex

47 N•m [35 lbf•ft]

G0060/G0061

060/080

M22-1.517 mm internalhex

70 N•m [52 lbf•lb]

AX465363259664en-000201

Service Manual
H1F Bent Axis Fixed Displacement Motors, Size 060/080/110/160/210/250
Torque chart
Plug size and torque chart (continued)© Danfoss | April 2024

Item

Frame size

O-ring plug

Wrench size

TorqueK0040/K0050

All

M18 - 1.5

24 mm hex

67 N•m [49 lbf•ft]

L0100

All

M18 - 1.5

24 mm hex

67 N•m [49 lbf•ft]

AX465363259664en-000201 | 31

Products we offer:

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Cartridge valves
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valvesElectric converters
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Danfoss Power Solutions is a global manufacturer and supplier of high-quality hydraulic andelectric components. We specialize in providing state-of-the-art technology and solutions
that excel in the harsh operating conditions of the mobile off-highway market as well as themarine sector. Building on our extensive applications expertise, we work closely with you toensure exceptional performance for a broad range of applications. We help you and othercustomers around the world speed up system development, reduce costs and bring vehicles
and vessels to market faster.

Gear motors

Danfoss Power Solutions – your strongest partner in mobile hydraulics and mobile
electrification.

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Go to www.danfoss.com for further product information.

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We offer you expert worldwide support for ensuring the best possible solutions foroutstanding performance. And with an extensive network of Global Service Partners, we also
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www.hydro-gear.com
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2800 East 13th Street
Ames, IA 50010, USA
Phone: +1 515 239 6000

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Krokamp 35
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All trademarks in this material are property of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

© Danfoss | April 2024

AX465363259664en-000201