Komatsu WA500-6H, Operation & Maintenance Manual

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4.5 Standard tightening torques for bolts and nuts
Maintenance Torque list
WA500-6H – VEAM430100
4-19
4.5 Standard tightening torques for bolts and nuts
4.5.1 Torque list
CAUTION
If nuts, bolts, or other parts are not tightened to the specified
torque, it will cause looseness or damage to the tightened parts,
and this will cause failure of the machine or problems with oper-
ation.
Always pay careful attention when tightening parts.
Unless otherwise specified, tighten the metric nuts and bolts to
the torque shown in the table below.
If it is necessary to replace any nut or bolt, always use a
KOMATSU genuine part of the same size as the part that was
replaced.
Thread
diameter of
bolt (a)(mm)
Width
across
flats
(b)(mm)
Tightening torque
Target value Service limit
N·m kgf·m lbft N·m kgf·m lbft
6
8
10
12
14
10
13
17
19
22 13.2
31
66
113
172
1.35
3.2
6.7
11.5
17.5
9.8
23.1
48.5
83.2
126.6
11.8-14.7
27-34
59-74
98-123
153-190
1.2-1.5
2.8-3.5
6.0-7.5
10.0-12.5
15.5-19.5
8.7-10.8
20.3-25.3
43.4-54.2
72.3-90.4
112.1-141
16
18
20
22
24 24
27
30
32
36 260
360
510
688
883 26.5
37
52.3
70.3
90
191.7
267.6
378.3
508.5
651
235-285
320-400
455-565
610-765
785-980 23.5-29.5
33.0-41.0
46.5-58.0
62.5-78.0
80.0-100.0
170.0-213.4
238.7-296.6
336.3-419.5
452.1-564.2
578.6-723.3
27
30
33
36
39 41
46
50
55
60 1295
1720
2210
2750
3280 132.5
175.0
225.0
280.0
335.0 958.4
1265.8
1627.4
2025.2
2423.1
1150-1440
1520-1910
1960-2450
2450-3040
2890-3630
118.0-147.0
155.0-195.0
200.0-250.0
250.0-310.0
295.0-370.0
853.5-1063.3
1121.1-1410.4
1446.6-1808.3
1808.3-2242.2
2133.7-2676.2
GK032236