Komatsu WA380-8, Operation & Maintenance Manual

Page: 330 / 432

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 di-
ameter of
bolt “a”
(mm)
Width
across flats
“b” (mm)
Tightening torque
Target value Allowable range
Nm kgm Nm kgm
6
8
10
12
14
10
13
17
19
22 13.3
30.5
66.5
111
177
1.35
3.15
6.75
11.3
18
11.8 to 14.7
27 to 34
59 to 74
98 to 123
157 to 196
1.2 to 1.5
2.8 to 3.5
6.0 to 7.5
10.0 to 12.5
16 to 20
16
18
20
22
24 24
27
30
32
36 277
385
549
746
927 28.3
39.3
56
76
94.5
245 to 309
343 to 427
490 to 608
682 to 829
824 to 1030
25 to 31.5
35 to 43.5
50 to 62
67.5 to 84.5
84 to 105
27
30
33
36
39 41
46
50
55
60 1325
1715
2205
2745
3260 135
175
225
280
333 1180 to 1470
1520 to 1910
1960 to 2450
2450 to 3040
2890 to 3630
120 to 150
155 to 195
200 to 250
250 to 310
295 to 370
Tighten the hoses by the following torque shown in the table.
STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS MAINTENANCE
4-10