Hitachi Zaxis 850LC-3 Operator's Manual page 302

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