Moto Tork MT70N User manual

TORQUE WRENCH FOR MOTORCYCLIST.
®
PAT.P
OPERATING INSTRUCTION
To use this product properly and safely, please read this manual carefully before use. If you have
any question about the product and its operations, please contact your nearest distributor or
TOHNICHI MFG. CO., LTD.

1
Warning
Caution
• Do not use this product for any other purpose than to tighten bolts.
This product is a torque wrench designed for tightening bolts.
• Keep the grip handle free of oil, grease, etc.
Oil or grease on the grip handle causes a slip of hand during tightening work, resulting in an
accident or injury.
• Check the product for any crack, flaw or rust.
Crack, flaw or rust may damage the product, resulting in an accident or injury.
Have it checked and repaired.
• Do not use this product for tightening work at a high place.
Dropping of the torque wrench or socket may cause a serious accident or injury.
• Do not extend the handle by connecting a pipe, etc.
It may damage the torque wrench or cause an accuracy failure.
• When applying force by hand to the torque wrench, do not use your weight or momentum or
do not step on the torque wrench.
The torque wrench may be damaged or bolts may come off, resulting in an accident or injury.
• Do not use the product with a torque exceeding the maximum torque value.
It may damage the product, resulting in an accident or injury.
• Do not use a torque wrench with any missing part, for example, no pin or no scale plate.
Contact your nearest distributor or TOHNICHI MFG. CO., LTD. and have it inspected or repaired.
• Do not modify the torque wrench.
Modifications may decrease the strength or cause an accuracy failure, resulting in an accident or injury.
• Do not drop the torque wrench or give a strong impact to it.
It may damage or deform the torque wrench and cause degradation of the accuracy and the
durability, resulting in an accident or injury.
• Before you turn around having a large torque wrench in your hand, look around carefully.
Turning around without looking around carefully may result in an accident or injury.
• Do not place the torque wrench in an upright position.
The torque wrench may fall down or drop, causing an accident or injury.
• Do not use any other part than that approved by TOHNICHI for repair of the torque wrench.
For repair of the torque wrench, contact your nearest distributor or TOHNICHI MFG. CO.,
LTD. and use the parts approved by TOHNICHI.

2
1. Do not use the product to measure out of its torque scale.
2. Do not set the value under the minimum graduation.
3. Before use, be sure to set the torque value.
The factory default is the minimum graduation value.
4. Be careful not to mistake the unit of torque measurement. (N·m, kgf·cm, etc.)
Before use, check the unit of torque measurement.
5. Do not use the torque wrench in water or in the sea.
It may deteriorate the internal structure, leading to an accident or injury.
If you drop the torque wrench in water or in the sea, have it inspected or repaired.
6. Before using this product for tightening work at a high place, take a measure to prevent it
from dropping.
Dropping of the torque wrench or socket may cause a serious accident or injury.
7. Use sockets which fit the hexagonal sides of bolts.
Using sockets that do not fit the hexagonal sides of bolts may result in an accident or injury.
8. Apply torque gripping the handle of torque wrench on the effective length line.
Unless you grip the handle on the effective length line, a correct torque value cannot be applied.
9. Stop tightening when you hear a "click" sound.
If you continue tightening after a click sound, excessive torque will be applied.
10. When using the product in a limited space, be careful not to be injured in your hand or elbow.
When operating the torque wrench, be careful not to bump your hand or elbow against the
surrounding objects.
11. Do not use the torque wrench as a substitute for hammer or leverage.
If the head or tube is deformed, a malfunction occurs, causing an adverse affect on the accuracy.
12. Be sure to conduct a periodic inspection.
The torque wrench needs a periodic inspection.
13. Direction of force
Apply force in the direction at right angles to the torque wrench.
Keep the vertical and horizontal angles within ±15 degrees of the right angles to the torque
wrench.
14. After use of the product, remove dirt, dust, mud, oil, water, etc., and then store it.
If the soiled product is stored, a malfunction or an accuracy failure may occur.
15. Before the torque wrench is kept unused for a long time, set the torque value to the
minimum, apply rust-proof oil, and store it in a dry place.
Improper storing expedites degradation in the accuracy and the durability.
Precautions for Use

3
1. Components.................................................................. 4
2. Specifications................................................................ 4
3. Maintenance.................................................................. 4
4. How to Set a Tool .......................................................... 5
5. How to Adjust the Tightening Torque........................... 5
6. How to Tighten Bolts .................................................... 6
7. How to Loosen the Tightened Bolt .............................. 6
8.
To Tighten with the Torque of 10 N·m or Less or 70 N·m or More: .... 6
9. To Tighten Vehicle Tire Wheel Nuts with The torque of 105 N·m: .... 7
10.
Bolt Diameters and Tightening Torques by Motorcycle Manufacturers (Reference) .... 7
11. Tightening Torque of General Standard Bolts/Nuts (Reference) .... 7
12. Torque Unit and Conversion Value ............................... 8
13. Screw Tightening Control ............................................. 8
14.
Conversion Table of Torque Units by kgf·cm (kgf·m) and N·m .... 9
15. Torque and Unit of Torque ............................................ 10
Contents

4
1) MT70N
2) Carrying case
3) Operating instruction
1. Components
2. Specifications
[Features]
1) Setting your tool to the Moto Tork makes a torque wrench.
2) Torque can be controlled when you tighten bolts in a limited space or with limited tools.
3) When you tighten a large bolt (with a higher tightening torque), torque can be controlled by
changing the effective length.
4) Basic open end spanner, ring spanner, hexagonal wrench key, 3/8 socket wrench and wheel
wrench can be set for torque control.
3. Maintenance
Torque wrenches are measurement tools.
With a proper daily use and maintenance, adequate performance can be maintained.
Before use, be sure to check the operation and make sure that it properly works.
1) Periodic inspection of torque wrench
The Moto Tork is maintenance-free. However, it is recommended to conduct a periodic
torque calibration.
2) Request for repair
The Moto Tork needs repair if the following symptoms appear:
(1) It does not operate (no click sound is heard) even if the set torque is reached.
(2) It is impossible to clamp a tool.
(3) It is impossible to set a torque.
(4) Even after the torque value is changed, the tightening torque is not changed.
Model Torque range Loading direction Effective length Total length
MT70N 10 to 70 N·m Clockwise 240 245
Accuracy Torque adjusting tool Gripping diameter Gripping length Weight
±5 % W4 (hexagon wrench) ø30 95 0.65 kg

5
First, push the push rod in with the thumb of your right hand
to spread the holder. (See Fig. 1.)
Next, insert the tool in the large holder and release your
finger from the push rod to secure the tool. (See Fig. 2.)
If the tool is not secured firmly and it moves easily, set the
tool to the small holder.
Set a large tool to the large holder and a small tool, such
as a hexagonal wrench key, to the small holder.
Finally, align the bolt center of the tool with a point 50 mm
away from the holder end. (See Fig. 3.)
Now, the tool setting is completed.
To remove the tool, spread the holder in the same way as
when setting the tool.
4. How to Set a Tool
5. How to Adjust the Tightening Torque
1. Refer to the service manual of your motor cycle, etc. to check the tightening torque.
2. Using the supplied hex key (across flats: 4 mm), set the torque.
The main scale is located on the side of the grip and its
white lines are seen through the scale window. (See Fig. 6.)
3. The basic torque can be set in the range from 10 to 70 N·m
by adjusting the zero point (white point) of the graduation
adjusting part located on the end of the grip to the main
scale inside the scale window. (See Figs. 4 and 5.)
The one place of the torque value can be set by clicking the
hex key: one click increases or decreases 0.5 N·m. One turn
(20 clicks) increases or decreases 10 N·m.
(Ex.) To set the tightening torque at 25N·m:
(1) Using the supplied hex key, set the zero point (white point)
seeing the main scale (20) and the basic line. (See Fig. 6)
(2) Then, turn the hex key and click 10 times. (See Fig. 5.)
Now, the torque setting is completed.
Zero point
(white point)
1 click
=0.5 N·m
Main scale
Standard line
Fig. 4
Fig. 5
Fig. 6
Fig. 3
Fig. 2
Fig. 1
50mm

6
1) Pretighten the bolt to some degree.
2) Fit the Moto Tork, to which the tool has been set, to the
pretightened bolt, and pull the grip in the arrow direction
(turn clockwise). (See the right figure.)
3) The torque detection part of the Moto Tork starts operating,
and if a clink sound is heard, the tightening is completed.
Do not tighten further.
It may cause over-torque.
6. How to Tighten Bolts
L1 (mm) 30 40 50
T (N·m) 9.1 9.55 10.0
L1 (mm) 50 60 70 80 90 100
T (N·m) 70 72.8 75.6 78.4 81.2 84.0
Setting torque 10N·m Setting torque 70N·m
If the Moto Tork is used to loosen the tightened bolt, reverse
the Moto Tork with the same conditions as those when
tightening the bolt, and turn it in the arrow direction (turn
counterclockwise).
At this time, it may makes a rapid turn. Be careful not to bump
your hand against any surrounding object. (Right figure)
[Cautions]
- Do not loosen any rusty bolt or thick bolt using the Moto Tork.
- Do not loosen bolts using the Moto Tork which is in a
tightening position.
7. How to Loosen the Tightened Bolt
Before loosening bolts, be sure to
reverse the Moto Tork (as shown in
the above).
Make sure that
there is no
obstacle in the
pulling direction.
If the tool is set to the Moto Tork so that the distance between the holder end and the bolt center
8. To Tighten with the Torque of 10 N·m or Less or 70 N·m or More:
is 50 mm (effective length: 240 mm), the bolt
can be tightened with the set torque indicated
on the scale. By changing the tool setting
length, bolts can be tightened with 10N·m or
less or 70N·m or more. (See the tables below.)

7
11. Tightening Torque of General Standard Bolts/Nuts (Reference)
Unit: N·m
9. To Tighten Vehicle Tire Wheel Nuts with the Torque of 105N·m:
Honda Suzuki Yamaha Kawasaki
[mm] [mm] Bolt/nut Flange Standard bolt Heavy-duty bolt Bolt/nut Bolt/nut
4 1 to 2 1.5 to 3
5 8 5 4 2 to 4 3 to 6 3 to 4 3 to 5
6 10 10 9 4 to 7 8 to 12 5 to 8 6 to 8
8 12 22 12 10 to 16 18 to 23 12 to 19 14 to 19
10 14 35 27 22 to 35 40 to 60 24 to 39 26 to 35
12 17 55 40 35 to 55 70 to 100 45 to 72 45 to 62
14 19 50 to 80 110 to 160 74 to 100
16 22 80 to 130 170 to 250 115 to 160
18 24 130 to 190 200 to 280 170 to 230
20 27 230 to 330
Width
across flat
Bolt
diameter
10. Bolt Diameters and Tightening Torques by Motorcycle Manufacturers (Reference)
* Note 1) Values in white fields indicate the torque values within the range of the Moto Tork scale.
2) For values in shaded fields, refer to "Tightening torque and tool setting length".
3) The values in the above table are just for reference. Refer to the service manual of your motor cycle
to check the tightening torque.
Effective length: 360 mm
L1: 169 mm
Unit: N·m
Nominal diameter (mm) M3 M4 M5 M6 M8 MlO M12 M14 M16 M18 M20 M22 M24
Tightening
T (S45C) 0.63 1.5 3 5.2 12.5 24.5 42 68 106 146 204 282 360
torque
1.8T (SCM) 1.14 2.7 5.4 9.2 22 44 76 122 190 270 370 500 650
2.4T (SNCM) 1.5 3.6 7.2 12.2 29.5 59 100 166 255 350 490 670 860
Standard axial stress: 210 N/mm2Effective cross section according to JIS B1082
1) Set the scale of the Moto Tork with 70N·m.
2) Set the tool so that the distance between the holder end and the nut center becomes
·
=
·169 mm. (See the figure below.)
The effective length shall be 360 mm.
[Reference expression: Effective length
= (105/70) x 240 = 360 mm]

The torque control method is broadly used for controlling the tightening of screws.
According to the torque control method, the axial force (N) is produced by the tightening torque (T).
If the tightening torque (T) is insufficient, the following problems occur due to insufficient axial force (N):
1. The tightened object is not held stationary and it moves unsteadily. (A long-time loading
causes looseness.)
2. The tightened objects are not held enclosed, resulting in a leakage. (A leak of oil, etc. is caused.)
3. The thermal conductivity of tightened objects becomes low, and they are heated. (Heat-
transfer efficiency is reduced.)
4.
The screw itself is not held stationary and it becomes loosened. (The screw is loosened and comes off.)
If the tightening torque (T) is excessive, the following problems occur:
1. Bolts or nuts are damaged.
2. The tightened object is damaged. (Especially, aluminum parts, etc.)
3. The bearing surface collapses. (Aluminum parts, low-intensity parts)
Thus, it is necessary to tighten screws with a proper tightening torque.
The relation between the tightening torque (T)
and the axial force (N) is expressed using the
torque coefficient for simplification as follows:
T=k x d x N
T: Tightening torque (N·m)
k: 0.1 ~ 0.2 ~ 0.3 (Torque coefficient)
d: Nominal diameter of bolt (m)
N: Axial force (N)
However, if the tightening torque value is specified in the service manual, follow the instruction in
the service manual.
8
13. Screw Tightening Control
1 N·m = 10.1972 kgf·cm . =
.10.2 kgf·m
12. Torque Unit and Conversion Value
Axial force N
10%
Friction of
bearing
surface
50%
Friction of
threaded part
40%
1 kgf·cm = 0.098066 N·m . =
.0.0981 N·m
S. I. unit Metric unit American unit
cN·m N·m kgf·Cm kgf·m Lbf·in Lbf·ft
cN·m 1 0.01 0.102 0.00102 0.0885 0.00738
N·m 100 1 10.2 0.102 8.85 0.738
kgf·Cm 9.81 0.0981 1 0.01 0.868 0.0723
kgf·m 981 9.81 100 1 86.8 7.23
Lbf·in 11.3 0.113 1.15 0.0115 1 0.833
Lbf·ft 136 1.36 13.8 0.138 12 1

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14. Conversion Table of Torque Units by kgf·cm (kgf·m) and N·m
kgf·cm 0123456789
10 0.98 1.08 1.18 1.27 1.37 1.47 1.57 1.67 1.77 1.86
20 1.96 2.06 2.16 2.26 2.35 2.45 2.55 2.65 2.75 2.84
30 2.94 3.04 3.14 3.24 3.33 3.43 3.53 3.63 3.73 3.82
40 3.92 4.02 4.12 4.22 4.31 4.41 4.51 4.61 4.71 4.81
50 4.90 5.00 5.10 5.20 5.30 5.39 5.49 5.59 5.69 5.79
60 5.88 5.98 6.08 6.18 6.28 6.37 6.47 6.57 6.67 6.77
70 6.86 6.96 7.06 7.16 7.26 7.35 7.45 7.55 7.65 7.75
80 7.85 7.94 8.04 8.14 8.24 8.34 8.43 8.53 8.63 8.73
90 8.83 8.92 9.02 9.12 9.22 9.32 9.41 9.51 9.61 9.71
100 9.81 9.90 10.0 10.1 10.2 10.3 10.4 10.5 10.6 10.7
Conversion factor: 1 kgf·cm = 0.098066 N·m
1 kgf·m = 9.8066 N·m
kgf·cm 0 10 20 30 40 50 60 70 80 90
100 9.81 10.8 11.8 12.7 13.7 14.7 15.7 16.7 17.7 18.6
200 19.6 20.6 21.6 22.6 23.5 24.5 25.5 26.5 27.5 28.4
300 29.4 30.4 31.4 32.4 33.3 34.3 35.3 36.3 37.3 38.2
400 39.2 40.2 41.2 42.2 43.1 44.1 45.1 46.1 47.1 48.1
500 49.0 50.0 51.0 52.0 53.0 53.9 54.9 55.9 56.9 57.9
600 58.8 59.8 60.8 61.8 62.8 63.7 64.7 65.7 66.7 67.7
700 68.6 69.6 70.6 71.6 72.6 73.5 74.5 75.5 76.5 77.5
800 78.5 79.4 80.4 81.4 82.4 83.4 84.3 85.3 86.3 87.3
900 88.3 89.2 90.2 91.2 92.2 93.2 94.1 95.1 96.1 97.1
1000 98.1 99.0 100 101 102 103 104 105 106 107
kgf·m 0123456789
10 98.1 108 118 127 137 147 157 167 177 186
20 196 206 216 226 235 245 255 265 275 284
30 294 304 314 324 333 343 353 363 373 382
40 392 402 412 422 431 441 451 461 471 481
50 490 500 510 520 530 539 549 559 569 579
60 588 598 608 618 628 637 647 657 667 677
70 686 696 706 716 726 735 745 755 765 775
80 785 794 804 814 824 834 843 853 863 873
90 883 892 902 912 922 932 941 951 961 971
100 981 990 1000 1010 1020 1030 1039 1049 1059 1069