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MAINTENANCE
500HOURS
3-7 500 HOURS MAINTENANCE AND CHECKS
First perform previous service hour hems
Check the Fixed BoltTorque
When loosened bolt or nut is found at daily check,
tighten it with torque specifications table.
1. Special torque specifications
Special tighten is applied for main bolts as
illustrated below.
When replacing bolts, apply molybdenum grease
to bolts, nuts, and bearing surface of nuts.
Then, tighten them with specibied torque.
Items Tighten point
Wrench size Thread size Tighten torque
metrie (mm) N
•
m
c
Travel drive Bar 8 M10 55
d
Sprocket Bar 8 M10 55
e
Lower roller 19 M12 108
f
Swing bearing 19 M12 108
g
Swing motor Bar 10 M12 108
Newrton meter (N
•
m) is approximately the same as 0.1 kg
•
m
2. General torque specifications
Other than above-mentioned, refer the next table
for torques.
Tighten torque
Metric Metric fine
coarse H.T. H.T. bolt
N
•
mN
•
m
M8 13 23 25
M10 17 47 50
M12 19 83 91
M14 22 134 135
M16 24 206 220
M20 30 412 450
M24 36 715 813
High pressure-hose
union nut
Hose size
Tighten torque
(inch)
N
•
m
1/4” 25
3/8” 49
1/2” 59
3/4” 118
1” 137
1-1/4” 167
Thread Wrench
size size
metric (mm)
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