Komatsu D475A-5E0, Operation & Maintenance Manual

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MAINTENANCE
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
TORQUE LIST
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.
Thread
diameter
of bolt
(a)(mm)
Width
across
flats
(b)(mm)
Tightening torque
Target value Service limit
Nm kgm lbft Nm kgm lbft
6
8
10
12
14
10
13
17
19
22 13.2
31
66
113
177
1.35
3.2
6.7
11.5
18
9.8
23.1
48.5
83.2
130.2
11.8 to 14.7
27 to 34
59 to 74
98 to 123
157 to 196
1.2 to 1.5
2.8 to 3.5
6.0 to 7.5
10.0 to 12.5
16.0 to 20.0
8.7 to 10.8
20.3 to 25.3
43.4 to 54.2
72.3 to 90.4
115.7 to 144.7
16
18
20
22
24 24
27
30
32
36 279
382
549
745
927 28.5
39
56
76
94.5
206.1
282.1
405.0
549.7
683.5 245 to 309
343 to 425
490 to 608
662 to 829
824 to 1030
25.0 to 31.5
35.0 to 43.5
50.0 to 62.0
67.5 to 84.5
84.0 to 105.0
180.8 to 227.8
253.2 to 314.6
361.7 to 448.4
488.2 to 611.2
607.6 to 759.5
27
30
33
36
39 41
46
50
55
60 1320
1720
2210
2750
3280 135.0
175.0
225.0
280.0
335.0 976.5
1265.8
1627.4
2025.2
2423.1
1180 to 1470
1520 to 1910
1960 to 2450
2450 to 3040
2890 to 3630 120.0 to 150.0
155.0 to 195.0
200.0 to 250.0
250.0 to 310.0
295.0 to 370.0 868.0 to 1085.0
1121.1 to 1410.4
1446.6 to 1808.3
1808.3 to 2242.2
2133.7 to 2676.2
Apply the following table for Hydraulic Hose.
Nominal-
No. of
threads (a)
Width
across
flats (b)
mm
Tightening torque
Target valve Parmissible range
Nm kgm lbft Nm kgm lbft
9/16 to 18UNF 19 44 4.5 32.5 34 to 54 3.5 to 5.5 25.3 to 39.8
11/16 to 16UN 22 74 7.5 54.2 54 to 93 5.5 to 9.5 39.8 to 68.7
13/16 to 16UN 27 103 10.5 75.9 84 to 132 8.5 to 13.5 61.5 to 97.6
1 to 14UNS 32 157 16.0 115.7 128 to 186 13.0 to 19.0 94.0 to 137.4
1
·
3/16 to 12UN
36 216 22.0 159.1 177 to 245 18.0 to 25.0 130.2 to 180.8
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