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 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):
1 Nm = 0.1 kgm > Thread diameter Width across of bolt (mm) flat (mm) (a) (b) 6 0.74 lbft (( )) 7’ wF Nm \) we, kgm lbft 10 13.2+1.4 | 1.3540.15] 9.73+ 1.03 8 13 31.4+2.9 3.2+0.3 23.2 + 2.1 10 16/17 65.7 + 6.8 6.7 + 0.7 48.5+5.0 12 18/19 112+ 9.8 11.54 1.0 82.6 + 7.2 14 21/22 177 +19 18.0 + 2.0 131+ 14 16 24 279+29 | 285+3 | 206+21 18 27 383 + 39 39+3 282 + 29 20 30 549 + 58 56+6 405 + 43 22 32/34 745 + 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 PC160/180/200-6k-ENG When tightening panels or other parts having tightening fixtures made of plastic, be careful not to use excessive frightening torque:
doing so will damage the plastic parts.