Standard Tightening Torques For Bolts And Nuts; Torque List - Komatsu D475A-5E0 Operation & Maintenance Manual

MAINTENANCE

STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS

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