Hitachi ZAXIS 120-3 class Operator's Manual page 278

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.
ZX250LC-3, 250LCN-3
No.
Engine cushion rubber mounting bolt and nut (Pump side)
1
Engine cushion rubber mounting bolt and nut (Fan side)
Engine bracket mounting bolt (Pump side)
2
Engine bracket mounting bolt (Fan 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
Jubilee clamp of high pressure piping
T-bolt clamp of high pressure piping
16 Swing bearing mounting bolt to
Travel device mounting bolt
17 Travel reduction device cover 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)
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
18
14
16
10
18
20
16
16
10
16
16
22 14
12
–
10
16
22
12
6
8
10
8
4 pairs
1/4-28UNF
22 35
22 36
20 32
14 12
20 40
16 16
18 72
20 408
18
7-87
Wrench
Size
mm N•m
4 27 400
4 22 180
8 24 270
8 17 65
4 27 400
4 30 550
4 24 210
3 24 270
8 17 65
4 24 210
4 24 270
32 650
8 10 90
17 25
19 30
22 40
27 95
32 140
36 180
41 210
– 17 35
4 17 25
4 24 210
2 32 550
8 19 110
– 10 10
– 13 10
– 17 50
13 11 to 13
11 6
9 7 6
4 8 6
9 10 6
32 650
32 650
30 630
22 180
30 550
24 270
27 460
27 860
8 27 500
Torque
(kgf•m)
(40)
(18)
(27)
(6.5)
(40)
(55)
(21)
(27)
(6.5)
(21)
(27)
(65)
(9)
(2.5)
(3)
(4)
(9.5)
(14)
(18)
(21)
(3.5)
(2.5)
(21)
(55)
(11)
(1)
(1)
(5)
(1.1 to1.3)
(0.6)
(0.6)
(0.6)
(0.6)
(65)
(65)
(63)
(18)
(55)
(27)
(46)
(86)
(50)