MAINTENANCE Tightening Torque Chart CAUTION: If fixing bolts for counterweight are loos- ened, consult your nearest authorized dealer. IMPORTANT: Make sure bolt and nut threads are clean before installing. Apply lubricant (e. g. white zinc B solved into spindle oil) to bolts and nuts to stabilize their friction coefficient. NOTE: Tightening torque required is shown in N•m. For example, when tightening a bolt or nut with a wrench of 1 m length, turning the end of it with a force of 120 N, the torque produced will be: 1 m Ч120 N = 120 N•m To produce the same torque with a wrench of 0.25 m: 0.25 m Ч N = 120 N•m Necessary force will be: 120 N•m ч 0.25 m = 480 N 7-92 Bolt Dia.
Wrench Size Hexagon Wrench Size M552-07-091 M552-07-090 Socket Bolt M157-07-225 N•m (kgf•m) (lbf•ft) N•m (kgf•m) (lbf•ft) N•m (kgf•m) (lbf•ft) M8 13 6 30 (3.1) (22) 20 (2.0) (15.0) 10 (1.0) (7.4) M10 17 8 65 (6.6) (48) 50 (5.1) (37) 20 (2.0) (15.0) M12 19 10 110 (11.0) (81) 90 (9.2) (66) 35 (3.6) (26.0) M14 22 12 180 (18.5) (135) 140 (14.0) (103) 55 (5.6) (41) M16 24 14 270 (27.5) (200) 210 (21.5) (155) 80 (8.2) (59) M18 27 14 400 (41.0) (295) 300 (30.5) (220) 120 (12.0) (89) M20 30 17 550 (56.0) (410) 400 (41.0) (295) 170 (17.0) (125) M22 32 17 750 (76.5) (550) 550 (56.0) (410) 220 (22.5) (162) M24 36 19 950 (97.0) (700) 700 (71.5) (520) 280 (28.5) (205) M27 41 19 1400 (143) (1030) 1050 (107) (770) 400 (41.0) (295) M30 46 22 1950 (200) (1440) 1450 (148) (1070) 550 (56.0) (410) M33 50 24 2600 (265) (1920) 1950 (200) (1440) 750 (76.5) (550) M36 55 27 3200 (325) (2360) 2450 (250) (1810) 950 (97.0) (700)