Komatsu PC130-7 - Tightening Torque Specifications and Safety Critical Parts

TIGHTENING TORQUE SPECIFICATIONS MAINTENANCE
4-14
TIGHTENING TORQUE SPECIFICATIONS 4
TIGHTENING TORQUE LIST 4
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 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.
q Apply the following table for Hydraulic Hose.
Thread
diame-
ter of
bolt
(a)(mm)
Width
across
flats
(b)(mm)
Tightening torque
Target value Service limit
N·m kgf·m N·m kgf·m
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
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
16
18
20
22
24
24
27
30
32
36
260
360
510
688
883
26.5
37
52.3
70.3
90
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
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
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
Hose
nominal
number
Width
across
flat
a(mm)
Tightening torque
Target valve Service limit
N
·mkgf·mN·mkgf·m
02 19 44 4.5 35-63 3.5-6.5
03
22 74 7.5 54-93 5.5-9.5
24 78 8.0 59-98 6.0-10.0
04 27 103 10.5 84-132 8.5-13.5
05 32 157 16.0 128-186 13.0-19.0
06 36 216 22.0 177-245 18.0-25.0