JLG 600SC_660SJC Service Manual - Manual (Page 34)

SECTION 3 - TURNTABLE
3-4 – JLG Lift – 3120898
Only green light on and no actuator movement
Action:
1. Adjust trim potentiometers.
2. If problem continues, replace unit.
3.3 SWING HUB
Adjustment Procedures
1. Ensure swing drive is located on bearing gear max
eccentric tooth (high spot).
2. With mounting free to slide, shim between pinion
and bearing gear teeth to achieve 0.008 - 0.012"
(0.203 - 0.304 mm) backlash.
3. Install a pry bar into hole in turntable base plate and
pry swing hub back tight against shim and bearing.
4. Torque bolts according to the torque chart in Section
1.
3.4 SWING BEARING
Turntable Bearing Mounting Bolt Condition
Check
NOTE: This check is designed to replace the existing bear-
ing bolt torque checks on JLG Lifts in service. This
check must be performed after the first 50 hours of
machine operation and every 600 hours of machine
operation thereafter. If during this check any bolts
are found to be missing or loose, replace missing or
loose bolts with new bolts and torque to the value
specified in the torque chart, after lubricating the bolt
threads with loctite #271. After replacing and
retorquing bolt or bolts recheck all existing bolts for
looseness.
1. Check the frame to bearing. Attach bolts as follows:
a. Elevate the fully retracted boom to 70 degrees
(full elevation).
b. At the positions indicated on Figure 3-4. try and
insert the .0015" feeler gauge between the bolt
head and hardened washer at the arrow indi-
cated position.
c. Assure that the .0015" feeler gauge will not pen-
etrate under the bolt head to the bolt shank.
d. Swing the turntable 90 degrees, and check
some selected bolts at the new position.
e. Continue rotating the turntable at 90 degrees
intervals until a sampling of bolts have been
checked in all quadrants.
Figure 3-3. Swing Torque Hub Adjustment