21. STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS
21.2 TORQUE LIST
Unless otherwise specified,tighten the metric bolts and nuts to
the torque shown in the table.
The tightening torque is determined by the width across the flats
CEJ of the nut and bolt.
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.
Nm (newton meter): INm = 0.1 kgm
i 0.74 Ibft
7
AD053380
Thread diameter
Width across
of bolt (mm) flat (mm)
(a)
(b)
1 ,@7 kgm $9~~300
9.73 k 1.03
23.2 * 2.1
48.5 f 5.0
82.6 f 7.2
131 f 14
6
10 13.2 k 1.4 1.35 & 0.15
8
13 31.4 f 2.9 3.2 f 0.3
IO
17 65.7 + 6.8
6.7 f 0.7
12
19 112 f 9.8 11.5 ? 1.0
14
22 177 * 19 18.0 i: 2.0
16
24 279 * 29 28.5 5 3
206f 21
18
27 383 & 39 39 + 3 282 f 29
20
30 549? 58 56 ? 6 405 f 43
22 32 746 k 78 76 * 8 549 f 58
24 36 927 + 98
94.5 5 10
684f72
27
41 1320 * 140
135 * 15 973 f 100
30
46 1720? 190 175 5 20 1270f 140
33
50 2210 & 240 225 & 25
1630 !C 180
36
55 2750 k 290 280? 30 2030 + 210
39 60 3280 * 340 335 * 35 2420 f 250
NOTICE
When tightening panels or other parts having tightening fix-
tures made of plastic, be careful not to use excessive tightening
torque: doing so will damage the plastic parts.
3-20
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