JLG 340AJ, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-58 – JLG Lift – 3121259
Disassembly
The servicing of these units requires a press, a 5/16" 12 point
socket, a 7/16" socket, a ¾" socket, torque wrench (80 lb-ft),
steel hammer, soft face hammer, bearing puller (external and
internal), large flat blade screw driver. Also needed are a shim
and seal kit (available from the JLG Parts Department), ¾" steel
rod at least 10" long, LocTite #515, Mobil SHC 007 grease,
Mobil SHC 460 grease, LocTite 242/243 for bolts, and any
replacement parts.
1. Remove the swing bearing assembly from the machine.
2. To remove the slew ring (14), remove two 1/4" (5) bolts
and washers (1) that hold the slew ring to the housing.
3. Remove four #6 machine screws (13) that are located on
the cover plate (19) immediately in front of the Pinion
(21).
4. Remove eight 5/16" 12 point cap screws (4) from gear/
pinion cap (18). Pry cap from housing. Cover plate (19)
will come off with cap. Note where sealant is on Cover
and plate so when assembling can put sealant in same
place. Note number and color of shims (26) between cap
and housing. Remove 6 small screws (13) from cover
plate. Pry cover plate (19) from cap (18) and discard
cover plate. Note number and color of shims between
cover plate and cap.
5. Remove Pinion and Gear assembly (15, 16, 17, 21, 23, 24,
and 31) from housing. These lift directly upward from
the housing.
6. Disassemble pinion and gear assembly using a press.
Support worm gear (31) on press with pinion (21) down
allowing room for pinion to be pressed out of gear. Press
pinion out of bearing (17) spacer (24) and worm gear
(31) Pressing on end of pinion. Remove face seal (23)
from face of worm gear (31). Note how the seal is assem-
bled.
S
Figure 3-37. Swing Bearing Torque Sequence