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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.
ZX330-3 Class
No.
1
Engine cushion rubber mounting bolt and nut
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
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
12
10
10
18
20
10
16
10
16
16
22
14
12
–
10
16
22
12
6
10
12
–
5 pairs
–
27
36
27
36
20
48
14
12
22
44
18
16
22
72
22
384
22
24
18
16
7-89
Wrench
Size
mm
N
m
•
4
27
400
8
19
110
17
65
4
27
400
4
30
550
6
17
65
4
24
270
8
17
65
4
24
210
4
24
270
32
650
8
12
90
17
25
19
30
22
40
27
95
32
140
36
180
41
210
50
260
–
17
35
4
17
25
4
24
210
2
32
550
8
19
110
–
10
10
–
17
50
–
17
90
13
10.3 to 12.4 (1.05 to 1.26)
17
20.5 to 22.6 (2.07 to 2.30)
8
10
6
41
1226
41
1226
30
630
22
180
32
680
27
460
32
840
32
1130
32
750
27
500
Torque
(kgf
m)
•
(40)
(11)
(6.5)
(40)
(55)
(6.5)
(27)
(6.5)
(21)
(27)
(65)
(9)
(2.5)
(3)
(4)
(9.5)
(14)
(18)
(21)
(26)
(3.5)
(2.5)
(21)
(55)
(11)
(1)
(5.1)
(9.2)
(0.6)
(125)
(125)
(63)
(18)
(68)
(46)
(84)
(113)
(75)
(50)
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