JLG 450AJ Service Manual - Manual (Page 43)

SECTION 2 - PROCEDURES
3120869 – JLG Lift – 2-27
2.13 WORM GEAR
Checking Worm Gear End Play
NOTE: JLG Industries requires that a annual inspection be
performed on the worm gear end play.
1. Using a dial indicator, measure end play of worm
gear, by applying side to side movement by hand to
platform.
2. If tolerance exceeds 0.254 mm (0.010"), reduce end
play to less than 0.127 mm (0.005"). Refer to Adjust-
ing End Play.
Adjusting End Play
1. Remove end plate.
2. Measure and record total thickness of existing shim
pack.
3. Determine thickness of shim pack required to obtain
0.025 - 0.127 mm (0.001" - 0.005") end play.
4. Adjust shim pack thickness as required to obtain
proper end play. Reduce end play by removing
thicker shims and replacing with thinner shims,
included in kit.
5. Replace end plate and torque bolts to 122 Nm (90 ft.
lbs.).
6. Recheck end play.
2.14 BOOM SYNCHRONIZING PROCEDURE
NOTE: If the Lower Boom assembly does not fully lower:
1. Remove all personnel from the platform.
2. Pull the red knob located under the main control
valve.
3. From Ground Control, activate the lift control switch,
raise Lower Boom 2 meters (6 feet).
4. After raising Lower Boom, release the red knob.
5. Activate Lower Boom Down, fully lower boom.
6. Repeat step 1 thru 5 if necessary.
Allowable Tolerance
.001 to .005 ( )
Fig 2 Adjusting End Play.
END PLATE
SHIMS
Parts Required
7016682 Shim Kit Includes;
3 of 0.005" thick shims
3 of 0.0075" thick shims
3 of 0.010" thick shims
Figure 2-22. Synchronizing Valve