JLG M400 ANSI Service Manual - Manual (Page 85)

SECTION 3 - CHASSIS & TURNTABLE
3121125 – JLG Lift – 3-43
i. Use suitable lifting equipment to carefully posi-
tion the turntable assembly above the machine
frame.
j. Carefully lower the turntable onto the swing
bearing. Ensure that the scribed line of the inner
race of the bearing aligns with the scribed mark
on the turntable. If a new swing bearing is used,
ensure that the filler plug fitting is at 90 degrees
from the fore and aft centerline of the turntable.
k. Apply a light coating of Loctite 271 to the new
bearing bolts and install through the turntable
and inner race of bearing.
3. Following the torque sequence shown in Figure 3-
15., tighten the bolts to an initial torque of 130 ft. lbs.
(175 Nm). Then following the same sequence,
tighten the bolts to 190 ft. lbs (260 Nm).
a. Remove the lifting equipment.
b. Route hydraulic lines through center of turntable
and frame and connect as tagged prior to
removal.
c. Using all applicable safety precautions, activate
the hydraulic system and functionally check
swing system for proper and safe operation.
Swing Bearing Torque Value
Install bolts with Loctite - 190 ft. lbs. (260 Nm).
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 0.010", reduce end play to less
than 0.005". Refer to Adjusting 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
0.001" - 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 90 ft. lbs. (122
Nm).
6. Recheck end play.
Allowable Tolerance
.001 to .005 ( )
Fig 2 Adjusting End Play.
END PLATE
SHIMS