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
31
67
111
172
1.35
3.2
6.8
11.3
17.5
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
6.0 to 7.5
10.0 to 12.5
15.5 to 19.5
16
18
20
22
24
24
27
30
32
36
260
360
510
688
883
26.5
37
52.3
70.3
90
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
27
30
33
36
39
41
46
50
55
60
1295
1715
2205
2745
3260
133
175
225
280
333
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
Tighten the hoses by the following torque shown in the table.
MAINTENANCE
STANDARD TIGHTENING TORQUE FOR BOLTS AND NUTS
4-11
Summary of Contents for D155AX-8E0
Page 2: ......
Page 11: ...Do not repeatedly handle and lift loads FOREWORD VIBRATION LEVELS 1 9...
Page 24: ......
Page 312: ......
Page 397: ...SPECIFICATIONS 5 1...
Page 404: ......
Page 405: ...REPLACEMENT PARTS 7 1...
