Hitachi ZAXIS 30U-5N Operator's Manual page 283

Tightening Torque Chart
Hexagon
Bolt Dia. Wrench
Wrench
Size
Size
M8 13 6
M10 17 8
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
d
CAUTION: If fixing bolts for counterweight are
loosened, consult your nearest authorized dealer.
IMPORTANT:
 Apply lubricant (e. g. white zinc B solved into spindle
oil) to bolts and nuts to stabilize their friction
coefficient.
 Remove soil, dust, and/or dirt from the nut and bolt
thread surfaces before tightening.
 Tighten nuts and bolts to specifications. If tightened
with excessively low or high torque, missing or
breakage of nuts and/or bolts may result.
MAINTENANCE
M552-07-091
N·m (kgf·m) (lbf·ft)
30 (3.0) (22)
65 (6.5) (48)
110 (11) (81)
180 (18) (135)
270 (27) (200)
400 (40) (295)
550 (55) (410)
750 (75) (550)
950 (95) (700)
1400 (140) (1030)
1950 (195) (1440)
2600 (260) (1920)
3200 (320) (2360)
Socket Bolt
N·m (kgf·m)
20 (2.0)
50 (5.0)
90 (9)
140 (14)
210 (21)
300 (30)
400 (40)
550 (55)
700 (70)
1050 (105)
1450 (145)
1950 (195)
2450 (245)
7-103
M552-07-090
(lbf·ft) N·m (kgf·m)
(15) 10
(37) 20
(66) 35
(103) 55
(155) 80
(220) 120
(295) 170
(410) 220
(520) 280
(770) 400
(1070) 550
(1440) 750
(1810) 950
M157-07-225
(lbf·ft)
(1.0) (7.4)
(2.0) (15)
(3.5) (26)
(5.5) (41)
(8.0) (59)
(12) (89)
(17) (125)
(22) (160)
(28) (205)
(40) (295)
(55) (410)
(75) (550)
(95) (700)