7

Maintenancefor TorqueTools

7-1. Daily Check ─────── 98
7-2. Adjustment Method(1) Adjustment of torque tool s ─ 99
(2) Adjustment for adjustable type torquescrew drivers ─────── 100(3) Adjustment for pre-set torque screw
driver─────────── 101(4) Adjustment for adjustable torque wrench
1) Below 420N model ───── 102
2) Adjusment of QLE, CLE ─── 1033) How to decide main graduation scaleline position for below 280N size
torque wrench ────── 1044) How to decide main graduation
scale line position for 420N andabove size ─────── 105(5) Adjustment for pre-set torque wrench ─ 106(6) Adjustment for dial indicating torquewrench ────────── 108

7-3. Parts Replacement(1) Replace ratchet part ───── 109(2) How to attach locker for adjustable
torque screw driver ──── 110

7-4. Parts list
(1) QL ──────────── 112(2) DB ──────────── 114

7-5. Cross-section Drawings ── 116

96

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

Chapter

About adjusting and special tools

7

Maintenance of torque tools needs in-depth
understanding about their structure and methods oftorque adjustment and repair.

Maintenance for
Torque Tools

For learning adjustment or repair methods, consult
Tohnichi or nearest distributors.

Technical Data

Adjusting tool for
LTD/RTD models:Thrustring tool for SP
models:Used for torque adjustment(zero point) of LTD / RTD
modelsUsed for torque adjustment
or disassembly of preset
type torque wrenches

Adjusting Tool for
QSP3 models:

Adjusting tool for DB
models:Used for torqueadjustment of QSP3/ QSP4 models

Used for torque adjustment
of dial indicating type torquewrenches as well as T-type andDOT models

97Chapter

7-1

Maintenance for Torque Tools

Daily Check

Torque tool daily check can help to ﬁnd any damaged or missed parts on the early stage, andthis prevents users from serious accidents.
Unlike the periodical calibrations, the evaluation standards of the daily check are determinedbased on the comparison between the result of this time and the last time.
Table 7-1.Daily Check List

Torque value

Scale

Outsideappearance

RatchetParts

Check list

How to check

Evaluation standard

Torque value

Dirt/stain
ScratchAberration of scale line
Crack
Peeling chrome
Rust
Bend of tube
Deformation of tube
Serial number
Abnormal ratchet
rotation

Visually
Operation test withtesterVisually
Visually
Visually
Visually
Visually
Visually
Visually
Visually
Visually
Turn ratchet right and left/
Shake ratchet part

Whether clearly recognize the indicating value
Whether the value of today is much diﬀerent
from the last time's/out of its usable capacity
Vague
Vague
Scale line is not on the standard line
Yes・NoYes・NoYes・NoYes・NoYes・NoWhether clearly recognize the serial number
Diﬀerent rotation sounds/
Strainge noise

Ball plunger missing/wearning
Ratchet lever missing
Screw missing/loosening
Unable to lock sub-scale
Head pin rattling
Sub-scale missing
Locker missing
Extension handle missing/loosening

Visually
Taking and putting out socket/bit
Visually
Visually
Tighten locker
Visually
Visually
Visually
Visually

Ball plunder missing
Socket/bit easily fallen out

Tendency

Locker hits the spring pin

Repairable/Unrepairable

Repairable

Repairable

Unrepairable

Repairable ifparts replaced

Repairable
Repairable ifparts replaced

When you find something wrong other than shown on the above list, repair it or ask yournearest Tohnichi distributor for repairing immediately.

98

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

7-2

Maintenance for Torque Tools

Adjustment method

Figure 7-1. Adjustment figure

ChapterC(1) Adjustment methods for torque tools
value with the measured torque value by repeating the zero point
correction and the gain adjustment several times. (Figure 7-1)

Zero point correction

7

αCorrectly
adjusted line
C
Maintenance for
Torque Tools

For a graduated torque measuring tool, coordinate the scale torqueMeasured torque

Chapter45°

For the zero point correction (Figure 7-1), the scale values are increased

Torque shown on the scaleor reduced by the same quantity (C) against the measured torque values.

Central point

Gain adjustment

If the error at the central point of the full-scale span is too large,

For the gain adjustment (Figure 7-1), the scale values arecarry out the above zero-point correction and gain adjustment .

magnified or reduced almost proportionally to the measured

If the error is still too large even after the procedure, the torquetorque values at a certain rate (α).

tool must be disassembled and repaired.

Adjusting procedures for adjustable type torque tools

Adjusting procedures for indicating type torque tools① Set the torque tool to the minimum scale value.

① Correct the value of the torque tool to the zero point. zero

② Correct the value to the minimum scale value with thetorque tester zero point correction, parallel shift (C).
③ Set the value of the torque tool to the maximum scale value.
④ Adjust the value to the maximum scale value with a torquepoint correction, parallel shift (C).
② Load the torque tool with the maximum torque value using
the torque tester and read the scale value.
③ Release the load and correct the value by adjustment gain
adjustment, multiplying shift (α ).

tester gain adjustment, multiplying shift (α).
⑤ Confirm the value adjustment by repeating procedures ①〜④.

④ Confirm the adjusted value by repeating procedures ①〜③.
＊Torque wrenches that do not have adjusting devices are not adjustable.

Table 7-2. Torque tool zero-point correction and gain adjustment locations
Zero Point Correction

Gain Adjustment

Beam type torque wrench

TypeSF, F, QF, CF

Needle bending

Scale plate replacement

Dial indicating torque wrench

DB, DBE,T

Dial rotation

Dial lever

Adjustable torque wrench

QL, PQL, QLE, CL, CLE

Sup. graduation replacement

Correcting screw

Dial indicating torquescrewdriver

FTD

Needle or springbracket rotation

FTD-S, FTD2-S

Scale rotation

Adjustable torquescrewdriverLTD, RTD, AMLD, BMLD, AMRD,
BMRD

Zero adjusting screwor shimCorrecting screwPower torque tool

U, ME, AP, AUR

Scale ring

Torque adjusting screw

Technical Data

Model Name

Vertical movementof spring seat99

Chapter

Maintenance for Torque Tools(2) Adjustment of adjustable type torque screwdrivers
Table 7-3.Rate of torque change for adjustable type torque screwdrivers (LTD, RTD)
Gain adjustment
Model

Zero point adjustment

Rate of torquechange (V)[cN·m/rev]

Rate of torquechange ( I )[cN·m/rev]

RTD15CN/LTD

−9

0.8

RTD30CN/LTD− 17.8

1.6

RTD60CN/LTD

− 42

4.2

Adjusting tool Fixing screw

Remarks

Zero adjustingscrew 1 rev

Catalog No.

tightening
torque value［cN・m］

51

60

46

90

47

190

RTD120CN/LTD

− 70

10

RTD260CN/LTD

− 154

10

48

RTD500CN/LTD

− 322

33.3

49

LTD1000CN

− 654

66.6

50

LTD2000CN− 1120

220

─

67.0
（t＝0.1［mm］） Shim adjustment t = 0.1 , t = 0.2 , t = 0.5※ The rate of torque change is reference use only

Adjustment of adjustable type torque screwdrivers(1) Loosen the set screw.
(2) Match the scale to the minimum scalevalue, set the tool on a tester, andmeasure the operating torque.
(3) Turn the zero adjusting screw tomatch the scale value with the actual
measured value.
CW : Torque value increase
CCW: Torque value decrease
Note: The zero adjusting screw should
be turned while the gain correcting
screw is in the tightened condition.
(4) Match the scale to the maximum scalevalue, set the tool on the tester, andmeasure the operating torque.
(5) Turn the gain correcting screw tomatch the scale value with the actual
measured value.
CW : Torque value decrease
CCW: Torque value increase
Note: The gain correcting screw should
be turned while the zero adjustingscrew is in the tightened condition.
(6) Repeat procedures (3)to (5) until min./max. value are within the accuracy
range.
(7) Tighten the set screw, and reconﬁrm theoperating torque at each measurement
point.

100

T − T0
Number of turns= ─────────
of the zero adjusting screw I（Amount of torque change）
Set torque T ＝ 60［cN・m］ 60 − 55──────＝ 0.5
Measured torque T0 ＝ 55［cN・m］
10Since 360°× 0.5 = 180°,
you are required to turn thezero adjusting screw 0.5
turn (180°) clockwise.

T − T0
Number of counterclockwise turns= ─────────
of the gain correcting screwV（Amount of torque change）
Since 360°× 0.13 = 47°,
Set torque T ＝ 260［cN・m］260 − 280
you are required to turn the gain──────＝ 0.13
Measured torque T0 ＝ 280［cN・m］ − 154correcting screw 0.13 turn (47°)
counterclockwise.

Figure 7-2. Detailed illustrationof parts during
adjustment

Adjusting tool
⊖ Slotted (minus) screwdriver
Zero-adjusting screw
Gain correcting screw
Set screw
Torque screwdriver

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

① Insert the adjusting tool into the hole ofadjusting screw (bottom of the driver).
Turn right: torque increases② Set a driver on the loading device of thetorque driver tester (TDT3-G).
③ Turn CW the loading device and measure
the torque value.
④ Repeat the procedure ①〜③, and adjust
accuracy.
Figure7-3.Names of parts for pre-set type torque drivercouplerbit

Table 7-4. Rate of torque change for pre-set type torque driver (NTD, RNTD)

model

Rate of torque change
per a revolution[cN･m ／ rev]

RNTD15CN
NTD15CN

7.7

RNTD30CN
NTD30CN

9.8

RNTD60CN
NTD60CN

21.1

RNTD120CN
NTD120CN

32

RNTD260CN
NTD260CN

62.7

RNTD500CN
NTD500CN

160.7

NTD1000CN

272.7

Adjusting tool
Catalog No.

42

43

44

adjusting tool
※ The rate of torque change is reference use only

torque increase

Figure 7-4. Torque screw driver tester with torque screw driver ﬁxed
grip

adjusting screw

Technical Data

101

Chapter

7
Maintenance for
Torque Tools(3) Adjustment of pre-set type torque driver7-2

Maintenance for Torque Tools

Adjustment method(4) Adjustment of adjustable torque wrench1）Adjustment of adjustable torque wrench below 420N
(Except for the following models: QL2N. 5N. 10N. 15N. QL25N5. CL2N. 5N. 10N. 15N. CL25N5)⑧ Repeat procedures ① to ⑦ to repeat the① Loosen the locker, and turn the supplemental
graduation to set it to the minimum scale value.

adjustment until both the minimum value and② Set the torque wrench on a tester, apply loading

maximum value are within the accuracy range.

and confirm the operating torque. Turn the⑨ When both the minimum value and maximum

supplemental graduation to match the actual

value are within the accuracy range, tap in themeasured value as the minimum scale value.

spring pin.

③ Remove the spring pin using nippers.

The position for tapping in the spring pin should④ Rotate the locker counterclockwise to remove it.

be where the supplemental graduation is free to⑤ Replace the supplemental graduation so that therotate when the locker is loosened, but allowing

0 of the scale is shown in the scale window.

the supplemental graduation to be ﬁxed when thelocker is tightened.

Figure7-5. Locker and spring pin correct position
Hit a spring pin into oneof holes within this range

Supplemental graduation
Pin side⑦ Rotate the supplemental graduation clockwise to

Spring pin

Tightened⑥ Attach the locker.

Pin
side
Smaller pin holematch the maximum scale value. Set the torquewrench on the tester, apply loading and confirm

After locking, there should beenough space as shown here.
Circled position is too close.

the operating torque.
・In the case where the actual measured value islower than the scale value, turn the correcting
screw counterclockwise (CCW).

Figure 7-6. Torque setting details
Supplemental graduation window
Main scale

Torque increase

Lockerhigher than the scale value, turn the correcting

0

'%
)%

・In the case where the actual measured value is
Torque decrease

Note: The correcting screw should be turned while
the torque wrench is in the operating condition.

102

40

screw clockwise (CW).
20

Chapter

Supplimental graduation
Scale line
Standard scale line

Spring pin

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

Chapter① Set the torque wrench on a tester, apply loading
and confirm the operating torque. Turn the
supplemental graduation to match the actual
measured value as the minimum scale value.

Table 7-5. Rate of torque change for adjusting screw
Rate of torque change
by adjusting screw per Flat to ﬂat distance ofModel
the adjusting wrencha revolution(Max. scale, CW)
QL1.5N4
0.4② Loosen the ﬁxing screw of the subsidiary scale

QL3N4

0.9

ring. Keeping the subsidiary ring fixed, match

QL6N4

1.7

the measured value with the minumum scale

QL12N4

3.5

value by turning the adjusting screw with

QL2N

0.4

adjusting box, and then tighten the ﬁxing screw

QL5N

1.4

of the subsidiary scale ring (tighten at 138N.m).

QL10N

2.9

Figure 7-7. Supplimental graduation adjustment

QL15N

4.3

ŏŋ

QL25N5

6.4

QL50N

14

QL100N423

QL140N33

QL200N445

QL280N63

QL420N

83

ŏ

Ő

ŋ

Ő

③ Make sure the 0 of the scale can be shown
from the scale window correctly.
④ Set the torque wrench to its maximum torque,and set on the tester.
・If the measered value is lower than the scalevalue, turn the adjusting screw CCW.

QLE550N
QLE550N2
QLE750N
QLE750N2

190
180

Note: Adjusting screw must be turned when the

QLE1400N

340

wrench operated.

QLE1400N2

230

QLE2100N

380

QLE2100N2300

QLE2800N2

440⑤ Repeat procedure ① 〜 ④ until the accracy
reaches within 3%.

※ Torque ⊿ is for reference use only.

Technical Data

2

2.5

130

QLE1000N2

value, turn the adjusting screw CW.

1.5

96

QLE1000N・If the measered value is higher than the scale

1.27

3

4

103

7
Maintenance for
Torque Tools

2) Adjustment of QLE2, CLE2

Chapter

7-2

Maintenance for Torque Tools

Adjustment method3）How to decide main graduation scale line position for below 280N size torque wrench(except for the following models: QL2N, 5N, 10N, 15N, QL25N5, CL2N, 5N, 10N, 15N, CL25N5).
① Conﬁrm the value of both Min. and Max. are within⑮ Reassemble the thrust ring and put it inaccracy range, and check the deviation of scale.

until it reaches to the depth measured in② Remove the spring pin using nippers.

procedure ⑤. Decide the scale position so③ Remove Locker.

that the value on the sub scale is going
to be the center of the scale window.

④ Remove graduation. Sup and seat.
⑤ Measure the depth from end surface to⑯ Tighten the thrust ring screw at the required
torque value (see P.107 table7-7).

thrust ring.
⑥ Loosen thrust ring screw by using hex spana.

⑰ Combine sub scale seat and sub scale.

⑦ Remove thrust ring.

⑱ Put a washer on locker, and lightly tighten
locker (pin will be ﬁxed after adjustment).

⑧ Remove adjusting screw and scale piece⑲ Adjust torque value (see P.102).

assembly.

⑳ Hit a pin into locker (see P.102).

⑨ Remove stop plate.
⑩ Remove main spring and seat.
⑪ Apply Ever Torque (P.447) inside tube.
⑫ Insert a shim (for adjusting scale) between
seat and main spring, and insert it inside tube.
⑬ set stop plate inside tube.
⑭ Insert scale piece.

Figure 7-9. Scale adjustment for adjusting type
torque wrench (whole)main spring

Figure 7-8. Scale adjustment for adjusting type
torque wrench (sectional)
seatstop plate
seatnylon washer
steel ballshim
main spring

scale piece assembly

thrust ring screw
spring pin

adjusting screw
thrust ringlockersub graduation seat
sub scale (graduation. Sup)
washer104

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

Chapter４）How to decide main graduation scale line position for 420N and above size
accracy range, and check the deviation of scale.

⑤ Check if scale is not moved pushing itwith chisel.

② Adjust the scale line.
if the line deviates to the head side from

Figure 7-11. Scale line deviation

standard line: adjust scale to the Max. value.

main scale

if the line deviates to the sub scale side fromsub scale window③ Hit the scale, adjust the scale line andstandard line: adjust scale to the Min. value.
standard line position.

scale line
standard scale line

㹫

1㺃

20 40

40

20

④ Fix scale with punching the scale.

Figure 7-10. QL scale adjustment

㹫

1㺃

60 0
8 0
10

Torque wrench tester with torque wrench set

Technical Data

7

105

Maintenance for
Torque Tools① Conﬁrm the value of both Min. and Max. are withinChapter

7-2

Maintenance for Torque Tools

Adjustment method（5）Adjustment for pre-set torque wrench
Adjusting method for pre-set type wench varies
depending on models. Please check the model nameof your torque wrench.
1）QSP(1.5N4 〜 280N3), QSPCA series① Insert the adjusting tool (Table 7-6) into the hexagonalhole with pin at the end of the wrench main unit
② Set the torque wrench on a tester, apply loading,and read the torque when the toggle operates.
Adjust the setting torque by turning the adjustingscrew, and repeat several times until the value
comes close to the torque setting that you wantto achieve.
CW: Torque value increase
CCW: Torque value decrease③ Then inspect the set torque value with the tester
ﬁve times or more to conﬁrm that the torque value
has become stable.

QSP4

QSPCA

Table7-6. Adjusting tool for QSP3
Adjusting tool
Torque wrench model nameCatalog No.

Tip shape [mm]Hex x Bore x Depth

QSP1.5N4 〜 QSP25N3/CSP

931

2.5 × 1.5 × 6

QSP50N3 〜 280N3/CSP

930

4 × 2.5 × 8

QSPCA6N，12N

931

2.5 × 1.5 × 6

QSPCA30N，70N

930

4 × 2.5 × 8

106

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

Chapter2）SP, QSP(420N)① Set the wrench on a torque wrench tester,③ Tighten the cap by turning it clockwise using

apply loading, and read the torque when thethe thrustring tool.

toggle operates. Adjust the setting torque by

CW: Torque value increase

turning the thrustring with the thrustring tool,④ Inspect the set torque value with the tester

close to the torque setting you want to achieve.

five times or more to confirm that the torque② Then inspect the set torque value with the tester

value has become stable.And tighten thrustring

three times or more to confirm that the torquescrew with set torque (Table7-7).

value has become stable, and tighten the thrustring⑤ Tighten cap by thrustring screw.

screw with the speciﬁed torque. (Table7-7)
Figure 7-12 QSP torque adjustment
thrustring screw

thrustring
torque increasetightentorque decrease

loosenthrustring tool

Table 7-7. Torque adjustment for SP and QSP models
Torque wrench model name
SP

―

QSP

Thrustring toolNo.

CatalogNo.

QSP6N/CSP

A-1

310

SP8N，19N

QSP12N/CSP

A-2

311

SP38N，67N

―

A-3

312

SP120N 〜 220N

―

A-4

313

SP310N

―

A-5

314

QSP420N/CSP

A-6

315

SP420N，560N

Technical Data

Thrustring screw

Thrustring

cap

Width across Tightening torqueheads B[mm]T[N・m]

a1/d1
[mm]

a2/d2
[mm]

6.8/2

6.8/2.2

9/2.5

9/3.2

2.0

12/3

12/3.2

16/3

16/3.23.0

18/3

18/3.2

20/3

20/3.2

1.5

0.5

2

3

107

Maintenance for
Torque Tools

CCW: Torque value decrease

and repeat several times until the value comescap

7Chapter

7-2

Maintenance for Torque Tools

Adjustment method(6) Adjustment for dial indicating torque wrench① Remove the back cover using the thrus tring tool. (P.107
table 7-7)
② Set the torque wrench in the tester so that a⑩ In the case where there is a discrepancy
between the tester value and the torque wrench
indicated value:

counterclockwise torque will be applied, and apply

When the tester value is lower than the torquepreloading. (Tester should carry this out in RUN

wrench indicated value, the sector should be

mode.)

widened.

③ Release the preloading, and carry out zero adjustment
both of the tester and torque wrench.
④ Again, set the torque wrench in the tester so that acounterclockwise torque will be applied, and apply
loading up to the torque wrench maximum speciﬁed
value. Read the value on the tester. (Tester should
carry this out in RUN mode.)

When the tester value is higher than the torquewrench indicated value, the sector should becompressed.
⑪ Repeat procedures (9) and (10) until the values arewithin the accuracy range.
⑫ Install the back cover to the main unit rear window.
Figure 7-13

⑤ In the case where there is a discrepancy between theback cover bodytester value and the torque wrench indicated value:
When the tester value is lower than the torquewrench indicated value, the sector should be
widened. When the tester value is higher than thetorque wrench indicated value, the sector should bethrust ring tool（No.312）

compressed.

back cover⑥ Repeat procedures (4) and (5) until the values arewithin the accuracy range.
⑦ Set the torque wrench in the tester so that a clockwise
torque will be applied, and apply preloading. (Tester

Figure 7-14

should carry this out in RUN mode.)left⑧ Release the preloading, and carry out zero adjustment
both of the tester and torque wrench.
⑨ Again, set the torque wrench in the tester so that astandard sector
rightclockwise torque will be applied, and apply loading
up to the torque wrench maximum specified value.
Read the value on the tester. (Tester should carrycompressed sector

Enlarged sector

this out in RUN mode.)108

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

7-3

Maintenance for Torque Tools

Parts Replacement
Chapter(1) Replace ratchet part
1) Disassembling the ratchet

Figure 7-15. Ratchet spring position
head saw① Remove the flat head screw (Phillips or7

hexagonal) using a screwdriver or hexagon key.
② Remove the head cover from the head and ratchet.

Maintenance for
Torque Tools

Chapter③ Remove the ratchet assembly.
④ Take out the ratchet springs. (Be carefulthat the ratchet springs do not spring out.)⑤ Remove the head saws.
2）Reassembling the ratchet

ratchet spring
spring bearing① Insert the head saw axis part back into thehole of the head of the head.
② Install the ratchet springs between the ratchet
and the head saws so that the springs small

Table 7-8. Tightening torque for head screw

Model

Tightening torque（N・m）

QL2N 〜 QL25N5/QSP

0.78

QL50N 〜 QL140N/QSP

1.42

QL200N 〜 QL420N/QSP

3.30

QLE550N2 〜 QLE1000N2

7

QLE1400N2 〜 QLE2800N2

11.6

diameters are touching the head saws. (Be carefulthat the ratchet springs do not spring out.)③ Insert the ratchet assembly while pressing
down on the head saw.
④ Install the head cover, centering the holeover the ratchet.
⑤ Place some screw adhesive on a small plate andapply a small quantity into the hole of the head
cover. (Be careful not to get the adhesive on theinside parts.)⑥ Tighten the ﬂat head screw (Phillips or hexagonal),
using a Phillips (plus) screwdriver or hexagon key.

Technical Data

109

Chapter

7-3

Maintenance for Torque Tools

Parts Replacement(2) How to attach locker for adjustable torque screw driver① Set the main scale and sub scale.

Figure 7-17. Direction to set the roller② Apply grease into the holes of roller, andSharp side is set to the coupler side

put roller on each hole.
＊Be careful of rollers for RTD260CN,
sharp side should be upward.
③ Insert locker (white dot of the locker

Sharp sideshould be the next to LOCK mark), andturn it counter clockwisely.
Make sure the ▼ marks and white dot
can match up.
④ From coupler side, insert locker pieces
until hear snap sound.
coupler＊Watch the direction of locker piece,
the ﬂat side should be with the RTD case side.
⑤ Conﬁrm the locker works correctly.

Figure 7-16 Assembling RTD locker
locker piece
white dotroller110

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

Chapter(3) Dial indicating torque wrench

Figure 7-18

7

B: Reassembling the dial gauge
Figure 7-19
window protector
bracketback cover body

dial gauge assembly
main body

dial barthrust ring tool（No.312）
back coversector pin
dial bar① Rotate and remove the back cover with the thrustring tool
(P.99 Table 7-5)
② Remove the protector cover. (DB1.5N4 to DB280N)③ Set the notched part of the glass plate so that it is parallelwith the tube.

① Place the bracket back in the center of the main unit protector.
② Insert the dial gauge assembly into the main unit window fromabove the bracket. Insert the sector pin into the groove of thedial bar. (conﬁrm using the round window on the rear side.)③ Apply screw adhesive to the screws of the protector.

④ Hold the body in a vice, insert the special tool (P.447)④ Match the positions of the dial gauge assembly and the

between the protector and the dial gauge assembly and pry

protector and tighten using the two M3 screws. (tightening

oﬀ the glass plate.

torque 0.6 [N·m])At this time, check the smooth rotation of the⑤ Pull oﬀ the needle using the special tool.

bracket.

⑥ Take oﬀ the scale plate.

⑤ Attach the spring plate.

⑦ Take oﬀ the spring plate.

⑥ Match the center hole of the scale plate with the dial gauge⑧ Loosen the two M3 screws with a Phillips screwdriver.

assembly axis, and assemble while aligning the bracket⑨ Lift up the dial gauge assembly and take oﬀ the sector pin

projections with the groove on the outside circumference of theof the dial gauge assembly from the groove of the dialbar while conﬁrming using the rear window of the main unit.
⑩ Remove the bracket from the protector.

scale plate.
⑦ Positioning the square drive of the main unit to the left andkeeping it facing up, install the needle.
⑧ Insert the plate glass, matching it with the center of the bracket.

Technical Data

111

Maintenance for
Torque Tools

A: Disassembling the dial gauge

Chapter

7-4

Maintenance for Torque Tools

Parts List

（1）QL

10
5

1
27

15
25

4
7

6

2

6 38

14

15
24
27

38

13
3
12
23

11

37

35
17

22

36

21
39

32
31

40

30
33
20
16

28
26
29
18
34

112

19

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATAPart Name

pcs/unit

Part NO.
QL25N

QL50N

QL100N4

QL140N

QL200N4

QL280N

1

Head

1

―

―

―

―

―

―

2

Head saw

2

02T26243

03T26243

01T48017

05T50449

02T48017

07T50449

3

Head cover

1

02T03360

03T03360

01T48013

05T50448

02T48013

4

Cam

1

02T03361

03T03361

01T48020

04T03361

05T50694

5

Ratchet lever

1

02T04762

03T04762

03T04762

04T04762

05T04762

6

Ratchet spring

2

06T03405

05T03405

01T03405

06T50450

12T03405

7

Ratchet assembly

1

00T16061B

00T16061C 00T48012A 00T16061W 00T48012B

00T50507B

10

Flat head screw

2

02T10312

03T50410

15T50410

05T50410

07T50410

07T50410

11

Tube

1

―

―

―

―

―

―

12

Thruster

1

06T12843

05T12843

03T12843

02T37240

13

Toggle1

06T50099

05T50099

08T50099

03T50099

14

Roller

1

00T35308B

00T35308C

00T35308E

00T35308F

15

Toggle pin

2

02T37432

03T37432

04T37432

05T37432

16

Thrust ring

1

05T10339

01T10339

03T10339

03T05034

17

Seat

1

06T05035

05T05035

04T50122

03T05035

18

Sub graduation

1

02T50100

00T50102B

00T50104B

00T50106B

19

Locker

1

04T50121

03T50121

03T50121

20

Adjusting screw

1

05T05031

01T05030

01T12405

21

Main spring

1

03T03924

04T03924

22

Stop plate1

09T48019

05T04995

04T04995

03T04995

23

Head pin

1

06T04995

05T05077

04T05077

03T05077

24

Nylon tube

1

06T05077

02T03420

02T03420

03T03420

25

Socket head screw

101003012607 01004015607

01004015607

01005020607

26

Thrust ring screw

1

04T05188

27

Steel ball

2

28

Spring pin

1050020074

29

Sub scale seat1

06T09483

05T09483

30

Scale piece

1

01T09904

01T09905

01T09906

01T12404

01T50548

01T37555

31

Scale plate1

01T50365

01T50366

01T50126

01T50368

01T50663

01T50370

32

Steel ball4

33

Nylon washer

1

02T50320

34

Washer

1

01T50539

35

Scale cover1

01T50538

02T50538

03T50538

36

Sub scale cover1

01T50267

02T50267

03T50267

37

Handle1

01T46004

02T46004

03T46004

38

Spring seat

2

―

―

01T48014

39

Graduation stopper

1

―

―

―

40

Scale pin

1

01T50575

Technical Data

11T03405

08T06731

01T48019

07T50448

03T50121

09T03924

01T50659

01T37556

02T48019

05T37346

02T05188

01T051880703/321

07001/81
050030084
04T09483

0703/321

07000031

03T50320

04T50320
02T50539

03T09483

07001/81
05T50320
03T50539
04T50538
04T50267
04T46004

05T46004

01T45879

01T48015

01T45984

06T50493

08T50493―

051.2004

113

Chapter

7
Maintenance for
Torque Tools

No.

Chapter

7-4

Maintenance for Torque Tools

Parts List

（2）DB
12

5
15
9

11

4

2

10

3
14

8
7

16

1

6
13

114

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

Chapter
PART NAMEOTYPART No.
※ Note

DB25N

DB50N

DB100N

DB200N――――

DB280N

1

TUBE ASSEMBLY

1

2

DIAL GAUGE ASSEMBLY

1

3

NEEDLE

1

00T12088A

4

PLATE, GLASS

1

01T28398

5

RIVET

1

06002004014

6

COVER, BACK

1

7

BALL, STEEL

1

07000051

07000061

07000071

8

SPRING, BALL

1

02T06494

03T06494

04T06494

9SCREW, FLAT HEAD

2

00T38056A―
00T07741A

Used for "non memorypointer" model only.

01T08491

01003006202

10 BRACKET

1

11 COVER, HEAD

1

01T12087

12 COVER, PROTECTOR

1

13 GRIP1

01T28410

01T28409

14 PLATE, SCALE

1

01T50193

02T50193

16 SPRING, PLATE

1

03T08172

15 S-S. IND. ASSEMBLY

1

00T16065F

01T28421

01T50383

01T50384

01T28423

01T28424

01T28406

01T28407

01T28408

03T50193

04T50193

04T28663

01T50174-S

Technical Data

115

7
Maintenance for
Torque Tools

No.

Chapter

7-5

Maintenance for Torque Tools

Cross-Section-DrawingsAP

OUTPUT AXIS

TRANSMISSION

CLUTCH

REDUCTION GEAR

VANE

ROTOR

STOP BUTTONTORQUE CONTROLTRIGGERHANDLE

PT3/8+2019 CONNECTOR

AC

PIN, HEAD
HEAD

TUBE

SCREW, ADJUSTING

PIN, ROLLER BUSH, ROLLERSCREW, ADJUSTINGTOGGLE THRUSTERSPRING, MAIN

SILENCER
CAP, BEVEL REDUCTION ASSY OUTPUT SHAFT GEAR,PLANETARYCOLLARVANE
BEVEL ASUPPORT

THRUSTRINGROLLERHANDLEBEVEL B
SEAT, BALL

RATCHET
TRIGGER116

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

Chapter

LTD（RTD）

NTD（RNTD）

7

SCREW, ADJUSTINGHANDLE
REST, TOGGLE

REST, TOGGLESPRING, MAIN

SEAT, TOGGLE
SHAFT, MAIN

SPRING, MAIN
LOCKERCASE
SCREW, ADJUSTINGSPRING, COUPLERPIECE, SCALESHAFT, MAIN

COUPLERSPRING, COUPLER

COUPLERFTD2-SPROTECTOR
S-S INDHANDLESCREW, THRUSTRINGSPRING COUPLER

PIPE

CAP

COUPLERSPRING, MAIN
PLATE, SCALE

SEAT, SPRING

STOPPER, S-S IND

Technical Data

117

Maintenance for
Torque Tools

SEAT, TOGGLE

7-5

Maintenance for Torque Tools

Cross-section Drawings

QL4
HEAD LEVER, RATCHET

PIN, ROLLER

PIN, HEAD TUBE TOGGLE

HANDLE

BUSH, ROLLERGRADATION, SUP

LOCKERRATCHETSCREW,SPRING, RATCHET ADJUSTINGSCREW, ADJUSTING

THRUSTER SEATSPRING, MAIN

MPQL

LINK

HEAD

LEVER

TUBE

RING, THRUST
PLATE, SCALEHANDLECOVER

ROD
RATCHETＮ・ｍ

２０

Chapter

LOCK COVER
MARKER
SOCKET

118

TOHNICHI TORQUE HANDBOOK Vol.8

TECHNICAL DATA

Chapter

SP

TUBE

HEAD

ROLLER THRUSTERSPRING, MAIN

SCREW THRUSTRING

7

PIN, HEADTOGGLESEAT

THRUSTRINGRESIN GRIP
SP8N-67N

DB
SS-INDI

COVER, HEAD

PLATE, SCALE

PLATE, GLASSDIAL, GAUGE ASSEMBLY

NEEDLESPRING, PLATE

BRACKETPROTECTOR COVER

GRIP

COVER, BACKADJUSTING WINDOWFORKSECTOR

Technical Data

119

Maintenance for
Torque Tools

CAP