JLG 680S, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121234 3-77
3.13 SWING DRIVE
Removal
1. Disconnect all wiring harness terminals connected to
the swing motor.
2. Gently loosen the setscrew. Do not remove.
3. Remove the pivot bolt using Allen Wrench.
4. Remove the mounting bolts securing swing drive hub to
the turntable.
5. Using the suitable lifting device, remove the swing drive
hub from mounting plate without damaging the swing
gear.
6. Place swing drive hub in the clean area.
7. Refer to Section 3.14 and Section 3.18 for swing drive
maintenance.
Installation
Ensure mounting plate and mounting location of the turnta-
ble baseplate are clean and painted with a uniform coating of
minimum thickness (no runs, drips, etc.).
Procedure for Setting Swing Gear Backlash
Set backlash to 0.008 to 0.012 in. (0.203 - 0.304 mm) using the
following procedure:
1. Place the machine on firm, level ground.
2. Place shim between pinion and bearing at bearing high
spot (shown below). The bearing high spot should be
stamped with “X” on the surface below teeth and
marked with yellow paint in the tooth space.
3. Apply JLG Threadlocker P/N 0100019 and torque pivot
bolt to 205 ft. lbs. (280 Nm) (shown below).
PIVOT BOLT
MOUNTING BOLT
SETSCREW
JAM NUT
HIGH SPOT
marked with yellow paint
HIGH SPOT in this area with
two x's and yellow paint in
tooth space.
PIVOT BOLT