. MAINTENANCE STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS STANDARD TIGHTENING TORQUES FOR BOLTS AND NUTS NOTICE When tightening panels or other parts having tightening fixtures made of plastic, be careful not to use excessive torque: doing so will damage the plastic parts. Pay enough attention when you tighten up. Apply the following table for Hydraulic Hose.
Taper seal 4 - 13 TORQUE LIST Unless otherwise specified, tighten the metric nuts and bolts to t he torque shown in t The tightening torque is determine d by the width across the flats (b ) of the nut and b If it i s necessary to replace any nut or bolt, always use a Komatsu genuine p art of the s ame size as the p art th at was replaced.
Thread diameter of bolt (a)(mm) Width across flats (b)(mm) Tightening torque Target value Service limit Nm kgm lbft Nm kgm lbft 6 8 10 12 14 10 13 17 19 22 13.2 31 66 113 177 1.35 3.2 6.7 11.5 18 9.8 23.1 48.5 83.2 130.2 11.8-14.7 27-34 59-74 98-123 157-196 1.2-1.5 2.8-3.5 6.0-7.5 10.0-12.5 16.0-20.0 8.7-10.8 20.3-25.3 43.4-54.2 72.3-90.4 115.7-144.7 16 18 20 22 24 24 27 30 32 36 279 382 549 745 927 28.5 39 56 76 94.5 206.1 282.1 405.0 549.7 683.5 245-309 343-425 490-608 662-829 824-1030 25.0-31.5 35.0-43.5 50.0-62.0 67.5-84.5 84.0-105.0 180.8-227.8 253.2-314.6 361.7-448.4 488.2-611.2 607.6-759.5 27 30 33 36 39 41 46 50 55 60 1320 1720 2210 2750 3280 135.0 175.0 225.0 280.0 335.0 976.5 1265.8 1627.4 2025.2 2423.1 1180-1470 1520-1910 1960-2450 2450-3040 2890-3630 120.0-150.0 155.0-195.0 200.0-250.0 250.0-310.0 295.0-370.0 868.0-1085.0 1121.1-1410.4 1446.6-1808.3 1808.3-2242.2 2133.7-2676.2 Thread diameter of bolt (a)(mm) Width across flats (b)(mm) Tightening torque Target value Service limit Nm kgm lbft Nm kgm lbft 10 14 14.7 1.5 10.8 12.7-16.7 1.3-1.7 9.4-12.3 14 19 29.4 3.0 21.7 27.5-39.2 2.8-4.0 20.3-28.9 18 24 78.5 8.0 57.3 58.8-98.1 6.0-10.0 43.4-72.3 22 27 117.7 12.0 86.8 88.3-137.3 9.0-14.0 65.1-101.3 24 32 147.1 15.0 108.5 117.7-176.5 12.0-18.0 86.8-130.2 30 36 215.7 22.0 159.1 176.5-245.2 18.0-25.0 130.2-180.8 33 41 255.0 26.0 188.1 215.7-284.4 22.0-29.0 159.1-209.8