Swing Hub Installation; Procedure For Setting Swing Gear Backlash - JLG 800A Service And Maintenance Manual

SECTION 3 - CHASSIS & TURNTABLE

3.9 SWING HUB INSTALLATION

Ensure mounting plate and mounting location of the base
plate are clean and painted with a uniform coating of mini-
mum thickness (no runs, drips, etc.).

Procedure For Setting Swing Gear Backlash

Set backlash to 0.010 in. to 0.015 in. (0.254 mm - 0.381 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).
HIGH SPOT in this area with
two x's and yellow paint in
tooth space.
HIGH SPOT
marked with yellow paint
3. Apply JLG Threadlocker P/N 0100019 and torque pivot
bolt to 205 ft. lbs. (280 Nm) (shown below).
Pivot Bolt
NOTE: Make sure the turntable is properly supported during the
following step. The turntable can swing a few degrees
when the turntable lock is removed if the turntable is not
balanced properly.
3-62
4. Remove turntable lock pin.
5. Apply JLG Threadlocker P/N 0100019 and pre-torque
swing drive mounting bolts to 30 ft. lbs. (40 Nm).
6. Tighten jack bolt until pinion is completely snug against
shim and bearing then loosen jack bolt.
7. Apply JLG Threadlocker P/N 0100019 and torque jack
bolt 50 ft. lbs. (68 Nm).
8. Apply JLG Threadlocker P/N 0100019 and tighten jam
nut.
Jam Nut
Jack Bolt
3121628