Komatsu PW98MR-10, Operation & Maintenance Manual

Page: 312 / 446

STANDARD TIGHTENING TORQUE FOR BOLTS AND
NUTS
Tightening torque list
k k
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 operation. Always be
careful 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, Komatsu recom-
mends using Komatsu genuine part of the same size as the
part that is removed.
Thread
diame-
ter of
bolt “a”
(mm)
Width
across
flats “b”
(mm)
Tightening torque
Target value Allowable range
Nm kgm lbft Nm kgm lbft
6
8
10
12
14
10
13
17
19
22 13.3
31
67
111
172
1.35
3.2
6.8
11.3
17.5
9.8
22.8
48.8
81.4
127
11.8 to 14.7
27 to 34
59 to 74
98 to 123
153 to 190
1.2 to 1.5
2.8 to 3.5
6 to 7.5
10 to 12.5
15.5 to 19.5
8.7 to 10.8
20.3 to 25.3
43.4 to 54.2
72.3 to 90.4
112 to 141
16
18
20
22
24 24
27
30
32
36 260
360
510
688
883 26.5
37
52.3
70.3
90
192
268
378
508
651 235 to 285
320 to 400
455 to 565
610 to 765
785 to 980 23.5 to 29.5
33 to 41
46.5 to 58
62.5 to 78
80 to 100
170 to 213
239 to 297
336 to 420
452 to 564
579 to 753
27
30
33
36
39 41
46
50
55
60 1295
1715
2205
2745
3260 133
175
225
280
333 957
1265
1630
2025
2405
1150 to 1440
1520 to 1910
1960 to 2450
2450 to 3040
2890 to 3630
118 to 147
155 to 195
200 to 250
250 to 310
295 to 370
853 to 1060
1120 to 1410
1450 to 1810
1810 to 2240
2130 to 2680
STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS MAINTENANCE
4-8
WENAM00061