July 2019
Service and Repair Manual
Turntable Rotation Components
Part No. 1286829GT
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How to Adj ust the Tur ntabl e R otati on Gear Backlash
How to Adjust the Turntable
Rotation Gear Backlash
The turntable rotation drive hub is mounted on an
adjustable plate that controls the gap between the
rotation motor pinion gear and the turntable bearing
ring gear.
Note: Perform this procedure with the boom
between the non-steer end tires and with the
machine on a firm and level surface.
1 Secure the turntable from rotating with the
turntable rotation lock pin.
Note: The turntable rotation lock pin is located next
to the boom rest pad.
2 Loosen the backlash pivot plate mounting
fasteners.
1 backlash pivot plate
2 adjustment bolt with lock nut
3 backlash pivot plate mounting bolts
3 Push the backlash pivot plate towards the
turntable as far as possible (this will push the
rotation gear into the turntable bearing ring
gear).
4 Loosen the lock nut on the adjustment bolt.
5 Turn the adjustment bolt clockwise until it
contacts the backlash pivot plate.
6 Turn the adjustment bolt 1/2 turn
counterclockwise. Tighten the lock nut on the
adjustment bolt.
7 Rotate the backlash pivot plate away from the
turntable until it contacts the adjustment bolt.
Then torque the mounting fasteners on the
backlash pivot plate to specification. 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.
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