Part No. 1268494
S-100 • S-105 • S-120 • S-125
3 - 131
March 2017
Section 3 • Repair Procedures
TURNTABLE ROTATION COMPONENTS
How to Adjust the
Turntable Rotation Gear Backlash
The turntable rotation drive hub is adjustable to
control the gap between the rotation motor gear
and the turntable bearing.
Note: Be sure to check the backlash with the
machine on a flat level surface.
1 Secure the turntable from rotating with the
turntable rotation lock pin.
2 Remove the ground controls side fixed turntable
cover. See 5-1,
How to Remove a Fixed
Turntable Cover.
3 Loosen the turntable rotate drive hub mounting
bolts. Do not remove them.
Note: It may be necessary to raise the boom
slightly to access all the turntable rotate drive hub
mounting bolts.
a
adjustment bolt with lock nut
b
pivot plate mounting bolts
4 Loosen the lock nut on the turntable drive hub
adjustment bolt.
5 Tighten the turntable drive hub adjustment
bolt until the turntable drive hub gear is fully
engaged and tight into the turntable rotate gear.
6 Turn the adjustment bolt
3/4
turn
counterclockwise. Tighten the lock nut on the
adjustment bolt.
7 Rotate the drive hub away from the turntable
rotate gear until it contacts the adjustment bolt.
Torque the turntable rotate drive hub mounting
bolts. Refer to
Specifications, Machine Torque
Specifications.
8 Rotate the turntable through an entire rotation.
Check for tight spots that could cause binding.
Readjust if necessary.
b
a
unlocked
locked
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