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TIGHTENING TORQUE SPECIFICATIONS
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
diameter
Width across
a(mm/
flat b(mm/
N•m/lbf-ft
inches)
inches)
6/0.25
10/0.4
8/0.3
13/0.5
10/0.4
17/0.7
12/0.5
19/0.7
14/0.6
22/0.9
177/130.5
16/0.6
24/0.9
279/205.8
18/0.7
27/1.1
382/281.7
20/0.8
30/1.2
549/404.9
22/0.9
32/1.25
745/549.5
24/0.9
36/1.4
927/683.7
27/1.1
41/1.6
1320/973.6
30/1.2
46/1.8
1720/1268.6
33/1.3
50/2.0
2210/1630
36/1.4
55/2.2
2750/2028.3
39/1.5
60/2.4
3280/2419.2
The torques marked I indicate the tightening torques for the hoses at the top of the swivel joint.
The torques marked * indicate the hightening torques for the hoses at the top of the swivel joint.
4-12
Target value
kgf•m/lbf-ft
13.2/9.7
1.35/9.7
31/22.9
3.2/22.9
66/48.7
6.7/48.7
11/8.1
11.5/8.1
18/130.5
28.5/205.8
39/281.7
56/404.9
76/549.5
94.5/683.7
135/973.6
1180-1470/870.3-1084.2
175/1268.6
1520-1910/1121.1-1408.7
225/1630
1960-2450/1445.6-1807
280/2028.3
2450-3040/1807-2242.2
335/2419.2
2890-3630/2131.6-2677.3
CAUTION
Tightening torque
Service limit
N•m/lbf-ft
11.8-14.7/8.7-10.8
27-34/19.9-25
59-74/43.5-54.6
98-123/72.3-90.7
157-196/115.8-144.6
245-309/180.7-227.9
343-425/253-313.5
490-608/361.4-448.4
662-829/488.3-611.4
824-1030/607.8-759.7
155.0-195.0/1121.1-1408.7
295.0-370.0/2131.6-2677.3
MAINTENANCE
kgf•m/lbf-ft
1.2-1.5/8.7-10.8
2.8-3.5/19.9-25
6.0-7.5/43.5-54.6
10.0-12.5/72.3-90.7
16.0-20.0/115.8-144.6
25.0-31.5/180.7-227.9
35.0-43.5/253-313.5
50.0-62.0/361.4-448.4
67.5-84.5/488.3-611.4
84.0-105.0/607.8-759.7
120.0-150.0/870.3-1084.2
200.0-250.0/1445.6-1807
250.0-310.0/1807-2242.2
0.
0.
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