Table of Contents
Advertisement
MAINTENANCE
TIGHTENING TORQUE SPECIFICATIONS
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 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.
Thread
Width
diameter
across
Target value
of bolt
flats
Nm
(a)(mm)
(b)(mm)
6
10
13.2
8
13
31
10
17
66
12
19
113
14
22
172
16
24
260
18
27
360
20
30
510
22
32
688
24
36
883
27
41
1295
30
46
1720
33
50
2210
36
55
2750
39
60
3280
Apply the following table for Hydraulic Hose.
Width
Thread diame-
across
ter a (mm)
flat
b(mm)
9/16 -18UNF
19
11/16 -16UN
22
13/16 -16UN
27
1 -14UNS
32
1·3/16 -12UN
36
*1-7/16-12UN
41
-2B
q
The torques marked * indicate the tightening torques for the hoses at the top of the swivel joint.
Tightening torque
Service limit
kgm
Nm
1.35
11.8-14.7
3.2
27-34
6.7
59-74
11.5
98-123
17.5
153-190
26.5
235-285
37
320-400
52.3
455-565
70.3
610-765
90
785-980
132.5
1150-1440
118.0-147.0
175.0
1520-1910
155.0-195.0
225.0
1960-2450
200.0-250.0
280.0
2450-3040
250.0-310.0
335.0
2890-3630
295.0-370.0
Tightening torque [Nm (kgm)]
Target
Permissible range
value
44 (4.5)
35 - 54 (3.5 - 5.5)
74 (7.5)
54 - 93 (5.5 - 9.5)
103 (10.5)
84 - 132 (8.5 - 13.5)
157 (16.0) 128 - 186 (13.0 - 19.0)
216 (22.0) 177 - 245 (18.0 - 25.0)
215 (22)
176 - 234 (18 - 24)
TIGHTENING TORQUE SPECIFICATIONS
CAUTION
kgm
1.2-1.5
2.8-3.5
6.0-7.5
10.0-12.5
15.5-19.5
23.5-29.5
33.0-41.0
46.5-58.0
62.5-78.0
80.0-100.0
4
4
4-15
Advertisement
Chapters
Table of Contents
