Check Tightening Torque Of Bolts And Nuts - Hitachi Zaxis 850LC-3 Operator's Manual

9 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 using a
torque wrench.
Torque Specifications
No
1 Engine cushion rubber mounting bolt
2 Engine bracket mounting bolt
3 Radiator mounting bolt
4 Oil Cooler mounting bolt
5 Hydraulic oil tank mounting bolt
6 Fuel tank mounting bolt
7 ORS fittings for hydraulic hoses and piping
8 Pump transmission mounting bolt
9 Pump device mounting bolt
10 Fan pump mounting bolt
11 Fan motor mounting bolt
12 Control valve mounting bolt
13 Control valve bracket mounting bolt
14 Swing device mounting bolt
15 Swing motor mounting bolt
16 Battery mounting nut
17 Cab mounting nut
Swing bearing mounting bolt to upper structure
18
Swing bearing mounting bolt to undercarriage
Travel device mounting bolt
19 Travel motor mounting bolt
Sprocket mounting bolt
20 Upper roller mounting bolt
NOTE: ★ Hexagonal socket wrench
Descriptions
MAINTENANCE
Bolt Dia
Q'ty
mm
Front 27 2
Rear 33 2
Front 14 8
Rear 20 12
27 4
24 4
20 4
18 8
3
1 – — –12UNF
16
7
1 – — –12UNF
16
12 14
20 8
16 4
12 2
20 4
20 8
24 28
20 24
12 2
16 6
33 41
30 48
27 48
18 8
27 48
22 24
7-88
Wrench
Size (mm) N•m
41 1050
50 1950
22 210
30 400
41 1050
36 950
30 400
27 300
36 180
41 210
19 110
★ 17 400
★ 14 210
19 110
30 400
30 400
36 950
30 400
19 35
24 210
50 2200
46 1750
41 1400
27 300
41 1400
32 750
Torque
(kgf•m) (lbf•ft)
(105) (770)
(195) (1440)
(21) (155)
(40) (295)
(105) (770)
(95) (700)
(40) (295)
(30) (220)
(18.0) (135)
(21.5) (155)
(11) (80)
(40) (295)
(21) (155)
(11) (80)
(40) (295)
(40) (295)
(95) (700)
(40) (295)
(3.5) (26)
(21) (155)
(220) (1620)
(175) (1290)
(140) (1030)
(30) (220)
(140) (1030)
(75) (550)