TIGHTENING TORQUE SPECIFICATIONS MAINTENANCE TIGHTENING TORQUE SPECIFICATIONS 4 TIGHTENING TORQUE LIST 4 If nuts, bolts, or other parts are not tightened to the specified torque, it will cause looseness or damage to the tightened parts, and this will cause failure of the machine or problems with operation. Always pay careful attention when tightening parts. Unless otherwise specified, tighten the metric nuts and bolts to the torque shown in the table below. 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. q Apply the following table for Hydraulic Hose.
4-14 CAUTION Thread diame- ter of bolt (a)(mm) Width across flats (b)(mm) Tightening torque Target value Service limit N·m kgf·m N·m kgf·m 6 8 10 12 14 10 13 17 19 22 13.2 31 66 113 172 1.35 3.2 6.7 11.5 17.5 11.8-14.7 27-34 59-74 98-123 153-190 1.2-1.5 2.8-3.5 6.0-7.5 10.0-12.5 15.5-19.5 16 18 20 22 24 24 27 30 32 36 260 360 510 688 883 26.5 37 52.3 70.3 90 235-285 320-400 455-565 610-765 785-980 23.5-29.5 33.0-41.0 46.5-58.0 62.5-78.0 80.0-100.0 27 30 33 36 39 41 46 50 55 60 1295 1720 2210 2750 3280 132.5 175.0 225.0 280.0 335.0 1150-1440 1520-1910 1960-2450 2450-3040 2890-3630 118.0-147.0 155.0-195.0 200.0-250.0 250.0-310.0 295.0-370.0 Hose nominal number Width across flat a(mm) Tightening torque Target valve Service limit N·m kgf·m N·m kgf·m 02 19 44 4.5 35-63 3.5-6.5 03 04 22 74 7.5 54-93 5.5-9.5 24 27 78 103 8.0 10.5 59-98 84-132 6.0-10.0 8.5-13.5 05 32 157 16.0 128-186 13.0-19.0 06 36 216 22.0 177-245 18.0-25.0