Check Tightening Torque Of Bolts And Nuts - Hitachi 120-3 class Operator's Manual

17

Check Tightening Torque of Bolts and Nuts

--- every 250 hours (first time after 50 hours)
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.
ZX120-3 Class
No.
1 Engine cushion rubber mounting bolt and nut
2 Engine bracket mounting bolt (Pump side)
3 Hydraulic oil tank mounting bolt
4 Fuel tank mounting bolt
Radiator mounting bolt (Upper side)
5
Radiator mounting bolt (Lower side)
6 Pump transmission mounting bolt
Control valve mounting bolt
7
Control valve bracket mounting bolt
8 Swing device mounting bolt
9 Swing motor mounting bolt
10 ORS fittings for hydraulic hoses and piping
11 Hycolin tube mounting nut
12 Battery mounting nut
Cab mounting nut
13 Cab mounting anchor bolt
Cab cushion rubber mounting bolt
14 Cover mounting bolt
Flexible master coupling of piping
15
T-bolt clamp of high pressure piping
16 Swing bearing mounting bolt to
Travel device mounting bolt
Travel reduction device cover
17
mounting bolt
Sprocket mounting bolt
18 Upper roller mounting bolt
19 Lower roller mounting bolt
20 Track shoe mounting bolt
21 Track guard mounting bolt
MAINTENANCE
Descriptions
(Upperstructure)
(Undercarriage)
ZX110-3, 130-3
ZX110M-3, 130LCN-3
ZX110-3, 130-3
ZX110M-3, 130LCN-3
ZX110-3, 130-3
ZX110M-3, 130LCN-3
ZX110-3, 130-3
ZX110M-3, 130LCN-3
ZX110-3
ZX130-3, 130LCN-3
ZX110M-3
ZX110-3
ZX130-3, 130LCN-3
ZX110M-3
ZX110M-3
For tightening nuts and bolts other than specified in
the table below, refer to the Tightening Torque Chart
at the end of this section.
IMPORTANT: Check and tighten bolts and nuts us-
ing a torque wrench.
Bolt Dia
Q'ty
mm
16
12
16
16
10
12
10
14
16
20 10
10
–
10
16
20
12
6
10
12
1/4-28UNF
–
18 30
16 36
16 28
16 32
14
14 12
16 32
20 32
12
16 16
16 48
16 56
18 48
16 328
16 352
20 336
18
7-84
Wrench
Size
mm N•m
4 24 235
8 19 110
4 24 270
4 24 270
4 17 50
3 19 90
8 17 65
4 22 140
4 24 270
30 500
7 8 64
17 25
19 30
22 40
27 95
32 140
36 180
41 210
– 17 35
4 17 50
4 24 210
1 30 550
8 19 110
10 10
– 17 50
19 90
– 11 5.9
8 10 6
27 390
24 265
24 310
24 310
8 22 175
22 175
24 265
30 460
8 19 98
24 265
24 300
24 300
27 450
24 410
24 410
27 804
8 27 500
Torque
(kgf•m)
(24)
(11)
(27)
(27)
(5)
(9)
(6.5)
(14)
(27)
(51)
(6.5)
(2.5)
(3)
(4)
(9.5)
(14)
(18)
(21)
(3.5)
(5)
(21)
(55)
(11)
(1)
(5)
(9)
(0.6)
(0.6)
(40)
(27)
(32)
(32)
(18)
(18)
(27)
(47)
(10)
(27)
(31)
(31)
(46)
(42)
(42)
(82)
(51)