. MAINTENANCE TIGHTENING TORQUE SPECIFICATIONS TIGHTENING TORQUE SPECIFICATIONS TIGHTENING TORQUE LIST CAUTION Apply the following table for Hydraulic Hose. The torques marked * indicate the tightening torques for the hoses at the top of the swivel joint. lbft 25.3-47.0 39.8-68.7 43.4-72.3 61.5-97.6 94.0-137.4 130.2-180.8 4 - 12 If nuts, b olts, or oth er parts are not tightened to th e specified torque, i t wil l cause looseness or dam age to the tightened parts , and this will cause failu re of t he ma chine or problems with operation. Always p ay carefu l attention w hen tightening par Unless otherwis e specified, tighten the metr ic nuts and bolts to t he torque shown in the table below.
If it is ne cessary to replace a ny nut or bolt, always use a Komatsu genuine part of the sa me size as the part that was replaced.
Thread diameter of bolt (a)(mm) Width across flats (b)(mm) Tightening torque Target value Service limit N·m kgf·m lbft N·m kgf·m lbft 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 9.8 23.1 48.5 83.2 126.6 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 8.7-10.8 20.3-25.3 43.4-54.2 72.3-90.4 112.1-141 16 18 20 22 24 24 27 30 32 36 260 360 510 688 883 26.5 37 52.3 70.3 90 191.7 267.6 378.3 508.5 651 235-285 320-400 455-565 610-765 785-980 23.5-29.5 33.0-41.0 46.5-58.0 62.5-78.0 80.0-100.0 170.0-213.4 238.7-296.6 336.3-419.5 452.1-564.2 578.6-723.3 27 30 33 36 39 41 46 50 55 60 1295 1720 2210 2750 3280 132.5 175.0 225.0 280.0 335.0 958.4 1265.8 1627.4 2025.2 2423.1 1150-1440 1520-1910 1960-2450 2450-3040 2890-3630 118.0-147.0 155.0-195.0 200.0-250.0 250.0-310.0 295.0-370.0 853.5-1063.3 1121.1-1410.4 1446.6-1808.3 1808.3-2242.2 2133.7-2676.2 Hose nominal number Width across flat a(mm) Target valve N·m kgf·m lbft N·m kgf·m 02 19 44 4.5 32.5 35-63 3.5-6.5 03 22 74 7.5 54.2 54-93 5.5-9.5 24 78 8.0 57.9 59-98 6.0-10.0 04 27 103 10.5 75.9 84-132 8.5-13.5 05 32 157 16.0 115.7 128-186 13.0-19.0 06 36 216 22.0 159.1 177-245 18.0-25.0