21.STANDARDTlGHTENlNGTORQUESFORBOLTSANDNUTS 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 @ 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 ‘=.
0.74 Ibft Thread diameter Width across of bolt (mm) (a) flat (mm) (b) Nm km Ibft 1 8 13 31.4 f 2.9 6 10 13.2 f 1.4 1.35 * 0.15 3.2 k 0.3 9.73 k 1.03 23.2 + 2.1 10 17 65.7 f 6.8 12 19 112 + 9.8 11.5 f 1.0 6.7 + 0.7 82.6 + 7.2 48.5 + 5.0 14 22 177 f 19 18.0 f 2.0 131 * 14 16 24 279 * 29 28.5 + 3 206 rt 21 20 30 549 k 58 18 27 383 k 39 39 * 3 56 k 6 282 k 29 405 * 43 22 32 745 f 78 24 36 927 f 98 94.5 f 10 76 k 8 549 k 58 684k 72 27 41 1320 f 140 135 * 15 973 k 100 30 46 1720 f 190 33 50 2210 zk 240 225 f 25 175 + 20 1630 k 180 1270 k 140 36 55 2750 f 290 280 f 30 2030 k 210 39 60 3280 k 340 335 f 35 2420 k 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. 3-15