Standard Tightening Torque For Bolts And Nuts - Komatsu WA600-8 Operation & Maintenance Manual

STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS

STANDARD TIGHTENING TORQUE FOR BOLTS AND
NUTS
Tightening torque list
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- Width
ameter of across
bolt "a" flats "b"
(mm) (mm)
6 10
8 13
10 17
12 19
14 22
16 24
18 27
20 30
22 32
24 36
27 41
30 46
33 50
36 55
39 60
Tighten the hoses to the torque shown in the table.
4-10
k k
Target value
Nm kgm
13.2 1.35
31 3.2
66 6.7
113 11.5
177 18.0
279 28.5
382 39.0
549 56.0
745 76.0
927 94.5
1320 135
1720 175
2210 225
2750 280
3280 335
CAUTION
Tightening torque
Allowable range
Nm
11.8 to 14.7
27 to 34
59 to 74
98 to 123
157 to 196
245 to 309
343 to 427
490 to 608
662 to 829
824 to 1030
1180 to 1470
1520 to 1910
1960 to 2450
2450 to 3040
2890 to 3630
MAINTENANCE
kgm
1.2 to 1.5
2.8 to 3.5
6.0 to 7.5
10.0 to 12.5
16 to 20
25 to 31.5
35 to 43.5
50 to 62
67.5 to 84.5
84 to 105
120 to 150
155 to 195
200 to 250
250 to 310
295 to 370