MAINTENANCE
3-20
21.2 TORQUE LIST
Unless otherwise specified, tighten the metric bolts and nuts to the torque
shown in the table.
The torque value is determined by the width across the flats (b)of the nut
and bolt.
If it is necessary to replace any nut or bolt, always use a genuine Komatsu
part of the same size as the part that was replaced.
NCm (newton meter): 1 NCm Ò 0.1 kgm
Ò 0.74 lbf ft
Thread diameter Width across
of bolt (mm) flat (mm)
(a) (b)
NCm kgm lbf ft
6 10 13.2 ± 1.4 1.35 ± 0.15 97.3 ± 1.03
8 13 31.4 ± 2.9 3.2 ± 0.3 23.2 ± 2.1
10 17 65.7 ± 6.8 6.7 ± 0.7 48.5 ± 5.0
12 19 112 ± 9.8 11.5 ± 1.0 82.6 ± 7.2
14 22 177 ± 19 18.0 ± 2.0 131 ± 14
16 24 279 ± 29 28.5 ± 3 206 ± 21
18 27 383 ± 39 39 ± 3 282 ± 29
20 30 549 ± 58 56 ± 6 405 ± 43
22 32 745 ± 78 76 ± 8 549 ± 58
24 36 927 ± 98 94.5 ± 10 684 ± 72
27 41 1320 ± 140 135 ± 15 973 ± 100
30 46 1720 ± 190 175 ± 20 1270 ± 140
33 50 2210 ± 240 225 ± 25 1630 ± 180
36 55 2750 ± 290 280 ± 30 2030 ± 210
39 60 3280 ± 340 335 ± 35 2420 ± 250
NOTICE
When tightening panels or other parts having tightening fixtures made of plastic, be
careful not to use excessive tightening torque: doing so will damage the plastic parts.
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