MAINTENANCE 17 Check Tightening Torque of Bolts and For tightening nuts and bolts other than specified in the table below, refer to the Tightening Torque Chart at the end of this section. Nuts --- every 250 hours (first time after 50 hours) IMPORTANT: Check and tighten bolts and nuts us- ing a torque wrench. Check tightness after the first 50 hours then every 250 hours. Tighten to torque shown if any are loose. Bolts and nuts should be replaced with those of the same or higher grade. 7-91 No.
Descriptions Bolt Dia Q’ty Wrench Size (mm) Torque mm N•m (kgf•m) 1 Engine cushion rubber mounting bolt 18 4 27 400 (40) 2 Engine bracket mounting bolt (Pump side) 12 8 19 110 (11) Engine bracket mounting bolt (Fan side) 10 10 17 65 (6.5) 3 Hydraulic oil tank mounting bolt 18 4 27 400 (40) 4 Fuel tank mounting bolt 20 4 30 550 (55) 5 Radiator mounting bolt (Upper side) 10 6 17 65 (6.5) Radiator mounting bolt (Lower side) 16 4 24 270 (27) 6 Pump mounting bolt 10 8 17 65 (6.5) 7 Control valve mounting bolt 16 4 24 210 (21) Control valve bracket mounting bolt 16 4 24 270 (27) 8 Swing device mounting bolt 22 14 32 650 (65) 9 Swing motor mounting bolt 12 8 12 90 (9) 10 ORS fittings for hydraulic hoses and piping 17 19 22 27 32 36 41 50 25 (2.5) 30 (3) 40 (4) 95 (9.5) 140 (14) 180 (18) 210 (21) 260 (26) 11 Hycolin tube mounting nut – – 17 35 (3.5) 12 Battery mounting bolt 10 4 17 25 (2.5) 13 Cab mounting nut 16 4 24 210 (21) Cab mounting anchor bolt 22 2 32 550 (55) Cab cushion rubber mounting bolt 12 12 19 110 (11) 14 Cover mounting bolt 6 – 10 10 (1) 10 – 17 50 (5.1) 12 – 17 90 (9.2) 15 Flexible master coupling of piping – 5 pairs 13 10.3 to 12.4 (1.05 to 1.26) 17 20.5 to 22.6 (2.07 to 2.30) T-bolt clamp of high pressure piping – 8 10 6 (0.6) 16 Swing bearing mounting bolt to (Upperstructure) 27 36 41 1226 (125) (Undercarriage) 27 36 41 1226 (125) 17 Travel device mounting bolt 22 40 32 750 (75) Travel reductuin device cover mounting bolt 16 12 24 270 (27) Sprocket mounting bolt 22 48 32 750 (75) 18 Upper roller mounting bolt 18 16 27 400 (40) 19 Lower roller mounting bolt 22 64 32 750 (75) 20 Track shoe bolt ZAXIS400R-3 24 368 32 1400 (140) ZAXIS400LCH-3 24 392 32 1400 (140) 21 Track guard mounting bolt ZAXIS400R-3 22 28 32 750 (75) ZAXIS400LCH-3 22 44 32 750 (75) 22 Front pin-retaining bolt 18 6 27 400 (41) Front pin-retaining nut 20 6 pairs 30 550 (56) 22 1 pair 32 750 (75) 23 Counterweight mounting bolt 36 6 55 2840 (290)