Driving Torques - Komatsu WB93S-5 F50003 Operation & Maintenance Manual

4.4 DRIVING TORQUES

4.4.1 STANDARD DRIVING TORQUES FOR SCREWS AND NUTS
If screws, nuts or other parts are not tightened with the required torque, they may become loose or
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damage the components with which they cooperate, and this may cause machine failures or operation
problems. Always pay the utmost attention when carrying out tightening operations.
If not specified otherwise, tighten screws and nuts with the torque
indicated in the table.
If it is necessary to replace a screw or a nut, always use Komatsu
original spare parts of the same size as those to be replaced.
a Nm (Newton metre): 1 Nm = 0.102 Kgm
Threaddiamete Pitch
r (a) (mm) (mm)
6
8 1,25
10 1,5
12 1,75
14
16
18 2,5
20 2,5
22 2,5
24
27
30 3,5
33 3,5
36
39
IMPORTANTE
This driving torque table is not valid for screws or nuts that must fasten parts made of nylon or similar
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materials onto washers or components made of nylon or nonferrous metals or requiring specific driving
torques.
Wrench size
(b) (mm)
1 10
13
17
19
2 22
2 24
27
30
32
3 36
3 41
46
50
4 55
4 60
ATTENZIONE
8.8
kgm Nm
0,96 ± 0,1 9,5 ± 1
2,3 ± 0,2 23 ± 2
4,6 ± 0,5 45 ± 4,9
7,8 ± 0,8 77 ± 8
12,5 ± 1 122 ± 13
19,5 ± 2 191 ± 21
27 ± 3 262 ± 28
38 ± 4 372 ± 40
52 ± 6 511 ± 57
66 ± 7 644 ± 70
96 ± 10 945 ± 100
131 ± 14 1287 ± 140
177 ± 20 1740 ± 200
230 ± 25 2250 ± 250
295 ± 33 2900 ± 330
DRIVING TORQUES
RYA02980
10.9
kgm Nm
1,3 ± 0,15 13,5 ± 1,5
3,2 ± 0,3 32,2 ± 3,5
6,5 ± 0,6 63 ± 6,5
11 ± 1 108 ± 11
17,5 ± 2 172 ± 18
27 ± 3 268 ± 29
37 ± 4 366 ± 36
53 ± 6 524 ± 57
73 ± 8 719 ± 80
92 ± 10 905 ± 98
135 ± 15 1329 ± 140
184 ± 20 1810 ± 190
250 ± 27 2455 ± 270
320 ± 35 3150 ± 350
410 ± 45 4050 ± 450
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