MAINTENANCE
IC75-2 ENG
4-10
FIXED BOLT TORQUE
Tighten the bolts and nuts as shown in the table below.
If loose bolts and nuts are found in daily check, tighten them. If lacking bolts and/or nuts are
found, be sure to replace new parts with lacking parts.
When a new machine is used, check the bolts and nuts when first 50 hours have past. Tighten
loose bolts and nuts.
Special Torque Specifications
The bolts and nuts shown in the table below bear large
forces. Tighten them at the torques shown in the table.
When these bolts and nuts are replaced, apply the locktite
to the threads and tighten them at the specified torques.
Traveling-rated
No.
Special tightening
Thread size Wrench size
(mm)
Tightening torque
N
⋅
m
kgf
⋅
m
1 Travel reduction gear
M16
24
241
24.6
2 Drive sprocket
M16
24
241
24.6
3 Oscillating link
M30
Castle nuts
46
476
48.6
4 Lower roller
M24
36
850
86.7
Observe the following procedures when attaching the drive sprocket.
(1) Bring the inner surface of the sprocket into close contact with the motor spigot when
attaching the sprocket.
(2) Tighten all of six bolts with the locktite applied at a torque of 98 to 156.9 N
⋅
m first.
(3) Then, tighten the bolts in the order shown on the right at the specified torque of 241 N
⋅
m.
Tighten the bolts quickly since screw locking agent is applied to them.