Hitachi ZW 120-6 Operator's Manual page 322

Tightening Torque Chart
Bolt
Dia.
mm
N·m (kgf·m) (lbf·ft) N·m (kgf·m) (lbf·ft)
6
8 30 (3.0) (22)
10 65 (6.5) (48)
12 110 (11) (81)
14 180 (18) (133) 140
16 270 (27) (200) 210
18 400 (40) (300) 300
20 550 (55) (410) 400
22 750 (75) (550) 550
24 950 (95) (700) 700
27 1400 (140) (1030) 1050 (105)
30 1950 (195) (1440) 1450 (145)
33 2600 (260) (1920) 1950 (195)
36 3200 (320) (2360) 2450 (245)
d
CAUTION: If counterweight mounting bolts are
loosened, consult your nearest authorized dealer.
IMPORTANT:
 Apply lubricant to bolts and nuts to lower friction.
 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
Hexagon Wrench
N·m
3.3 to 4.2 (0.3 to 0.4) (2.4 to 3.1)
20 (2.0) 15) 10
(
50 (5.0) 37) 20
(
90 (9) 66) 35
(
(14) 103) 55
(
(21) 155) 80
(
(30) 220) 120
(
(40) 300) 170
(
(55) 410) 220
(
(70) 520) 280
(
770) 400
(
1070) 550
(
1440) 750
(
1810) 950
(
7-104
Wrench
size
mm
(kgf·m) (lbf·ft)
10
(1.0) (7.4) 13
(2.0) (15) 17
(3.5) (26) 19
(5.5) (41) 22
(8.0) (59) 24
(12) (89) 27
(17) (125) 30
(22) (162) 32
(28) (205) 36
(40) (300) 41
(55) (410) 46
(75) (550) 50
(95) (700) 55
Socket Bolt
Wrench
Socket Bolt
size
mm
N·m (kgf·m) (lbf·ft)
5
20 (2.0) (15) 6
50 (5.0) (37) 8
90 (9) (66) 10
140 (14) (103) 12
210 (21) (155) 14
300 (30) (220) 14
400 (40) (300) 17