JLG 450A II Series, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3-38 – JLG Lift – 3121290
Disassembly
Refer to Figure 3-32., Swing Bearing Drive.
1. Clean area around swing motor (1) to prevent any dirt
from entering system.
2. Tag and disconnect hydraulic lines running to swing
motor. Cap or plug all openings.
SECURE WORM GEAR SHAFT SO IT DOES NOT PULL OUT ANY WHEN REMOVING
THE SWING MOTOR. FAILURE TO DO SO COULD DAMAGE WORM GEAR SEALS.
3. Remove bolts (2) and washers (3) securing swing motor
to swing drive housing (4).
4. Carefully pull swing motor from housing.
Refer to Figure 3-40., Swing Motor Removal and Installation.
1. Remove two bolts (5) and washers (6) that hold turnta-
ble bearing (7) to housing (4).
2. Remove two machine screws (8) on cover plate (9)
immediately in front of pinion (10).
3. Remove eight cap screws (11) from gear pinion cap (12).
Pry cap from housing. Cover plate (9) will come off with
cap. Note where sealant is on cover and plate so it can
be applied in same location during assembly. Note num-
ber and color of shims (13) between cap and housing.
4. Remove six small screws (14) from cover plate. Pry cover
plate (9) from cap (12). Discard cover plate. Note number
and color of shims (15) between cover plate and cap.
NOTE:
If there are five screws or drive screws holding cover plate
to cap, a new cap (12) should be ordered. This is an older
version; new cover plate has six holes.
5. Lift directly up and remove pinion and gear assembly
(10, 16 - 22) from housing (4).
6. Disassemble pinion and gear assembly using a press.
Support worm gear (20) on press wIth pinion (10) facing
down. Allow room for pinion to be pressed out of gear.
Press pinon out of bearing (22), spacer (21), and worm
gear (20).
7. Remove face seal (18) and O-ring (19) from face of worm
gear (20). Note how seal is assembled.
8. Remove bearing (17) and Nilos Ring (16) from pinion (18)
with an external bearing puller or press.
9. Remove motor adapter (23) and shim (24).
10. Remove two bolts (25) from worm cap (26). Remove and
discard shims (27) and seal (28).
11. Remove worm (29) from housing (4) by pushing worm
from motor end using a steel rod and hammer. Use a
soft hammer to tap worm on hex end to remove bearing
(30) from opposite end of housing.
12. If necessary, remove bearing cup from adapter (23)
using a small pry bar or by welding a small bead of weld
on internal diameter of the cup.
13. Remove bearing (31) from worm (29) using an external
bearing puller or press.