JLG 450A_AJ Series II Service Manual - Manual (Page 117)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-67
Disassembly
Refer to Figure 3-49., 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 3-55., Swing Motor Removal and Installation.
1. Remove two 5/16" bolts (5) and washers (6) that
hold turntable bearing (7) to housing (4).
2. Remove two #6 machine screws (8) on cover plate
(9) immediately in front of pinion (10).
3. Remove eight 3/8" 12 point 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 number and color of
shims (14) between cap and housing.
4. Remove six small screws (15) from cover plate. Pry
cover plate (9) from cap (12). Discard cover plate.
Note number and color of shims (13) 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 pinon and gear assembly
(10, 16, 17, 34, 18 - 22) from housing (4).
6. Disassemble pinion and gear assembly using a
press. Support worm gear (20) on press wIth pinion
(10) facing down, allowing 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 (33) and shim (34).
10. Remove two 1/2" bolts (25) from worm cap (26) with
a 3/4" socket. Remove shIms (27) and seal (28) and
discard.
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 (36) from opposite end of housing.
12. Remove bearing (30) from worm (29) using an exter-
nal bearing puller or press.
13. Remove press fit bearing cup (35) from adapter (33)
using a small pry bar or by welding a small bead of
weld on internal diameter of the cup.