MAINTENANCE
7-88
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.
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.
ZX280LC-3, 280LCN-3
No. Descriptions
Bolt Dia
Q’ty
Wrench
Size
Torque
mm mm N
•
m (kgf
•
m)
1
Engine cushion rubber mounting bolt and nut (Pump side) 18 4 27 400 (40)
Engine cushion rubber mounting bolt and nut (Fan side) 14 4 22 180 (18)
2
Engine bracket mounting bolt (Pump side) 16 8 24 270 (27)
Engine bracket mounting bolt (Fan side) 10 8 17 65 (6.5)
3 Hydraulic oil tank mounting bolt 18 4 27 400 (40)
4 Fuel tank mounting bolt 20 4 30 550 (55)
5
Radiator mounting bolt (Upper side) 16 4 24 210 (21)
Radiator mounting bolt (Lower side) 16 3 24 270 (27)
6 Pump transmission mounting bolt 10 8 17 65 (6.5)
7
Control valve mounting bolt 16 4 24 210 (21)
Control valve bracket mounting bolt 16 4 24 270 (27)
8 Swing device mounting bolt 22 14 32 650 (65)
9 Swing motor mounting bolt 12 8 10 90 (9)
10 ORS fittings for hydraulic hoses and piping
17 25 (2.5)
19 30 (3)
22 40 (4)
27 95 (9.5)
32 140 (14)
36 180 (18)
41 210 (21)
11 Hycolin tube mounting nut – – 17 35 (3.5)
12 Battery mounting nut 10 4 17 25 (2.5)
13
Cab mounting nut 16 4 24 210 (21)
Cab mounting anchor bolt 22 2 32 550 (55)
Cab cushion rubber mounting bolt 12 8 19 110 (11)
14 Cover mounting bolt
6 – 10 10 (1)
8 – 13 10 (1)
10 – 17 50 (5)
15
Flexible master coupling of piping
8
1/4-28UNF
4 pairs
13 11 to 13 (1.1 to1.3)
11 6 (0.6)
Jubilee clamp of low pressure piping
9 7 6 (0.6)
4 8 6 (0.6)
T-bolt clamp of low pressure piping 9 10 6 (0.6)
16 Swing bearing mounting bolt
(Upperstructure) 22 35 32 650 (65)
(Undercarriage) 22 36 32 650 (65)
17
Travel device mounting bolt 20 40 30 630 (63)
Travel reduction device cover mounting bolt 14 12 22 180 (18)
Sprocket mounting bolt 20 48 30 550 (55)
18 Upper roller mounting bolt 18 16 27 460 (46)
19 Lower roller mounting bolt 22 64 32 840 (84)
20 Track shoe mounting bolt 22 384 32 1160 (116)
21 Track guard mounting bolt 22 8 32 750 (75)
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