Standard Tightening Torques For Bolts And Nuts; Torque List - Komatsu Avance WA500-3 Operation & Maintenance Manual

STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS

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
16 24 279 28.5
18 27 382
20 30 549
22 32 745
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.
Thread Width
diameter across
Target value
flats
Nm kgm
a (mm) b (mm)
10 14 14.7 1.5
14 19 29.4 3.0
18 24 78.5 8.0
22 27 117.7 12.0
24 32 147.1 15.0
30 36 215.7 22.0
33 41 255.0 26.0
4 - 12
Tightening torque
Service limit
lbft Nm kgm
9.8 11.8-14.7 1.2-1.5
23.1 27-34 2.8-3.5
48.5 59-74 6.0-7.5
83.2 98-123 10.0-12.5
18 130.2 157-196 16.0-20.0
206.1 245-309 25.0-31.5
39 282.1 343-425 35.0-43.5
56 405.0 490-608 50.0-62.0
76 549.7 662-829 67.5-84.5
683.5 824-1030 84.0-105.0
976.5 1180-1470 120.0-150.0
1265.8 1520-1910 155.0-195.0
1627.4 1960-2450 200.0-250.0
2025.2 2450-3040 250.0-310.0
2423.1 2890-3630 295.0-370.0
Tightening torque
Permissible range
lbft Nm kgm
10.8 12.7 - 16.7 1.3 - 1.7
21.7 27.5 - 39.2 2.8 - 4.0
57.9 58.8 - 98.1 6.0 - 10.0
86.6 88.3 - 137.3 9.0 - 14.0
108.5 117.7 - 176.5 12.0 - 18.0
159.1 176.5 - 245.2 18.0 - 25.0
188.1 215.7 - 284.4 22.0 - 29.0
CAUTION
lbft
8.7-10.8
20.3-25.3
43.4-54.2
72.3-90.4
115.7-144.7
180.8-227.8
253.2-314.6
361.7-448.4
488.2-611.2
607.6-759.5
868.0-1085.0
1121.1-1410.4
1446.6-1808.3
1808.3-2242.2
2133.7-2676.2
lbft
9.4 - 12.3
20.3 - 28.9
43.4 - 72.3
65.1 - 101.3
86.8 - 130.2
130.2 - 180.8
159.1 - 209.8
MAINTENANCE