JLG 450A_AJ Series II Service Manual - Manual (Page 93)

SECTION 3 - CHASSIS & TURNTABLE
3121180 – JLG Lift – 3-43
3.4 RE-ALIGNING TORQUE HUB INPUT
COUPLING
The following procedure applies to torque hubs with integral
brakes:
Equipment Required
1. Hydraulic power supply (hand pump) capable of
producing 200 psi (13.8 bar).
2. Hydraulic fittings to adapt hydraulic supply to brake
release port on hub.
Procedure
1. Using appropriate fittings, connect a line from
hydraulic power supply to brake port.
2. Pressurize brake release port to 155 - 200 psi
(10.6 - 13.8 bar) to release brake.
3. Verify brake is released by rotating input coupling or
hub spindle. Once brake is released, input coupling
is free to re-align with drive motor.
4. Install drive motor on hub. Release hydraulic pressure
at brake release port. Coupling remains in position.
5. Disconnect hydraulic power supply and reconnect
line to brake release port.
3.5 DRIVE MOTOR
NOTE: This procedure covers 2WD motors used on Cater-
pillar, Deutz, and Ford powered machines built prior
to S/N 0300100514).
Disassembly
1. Clean outside of unit thoroughly.
2. Clamp shaft in a protected jaw vise with back plate
end up.
3. Remove six cap screws (23 or 28 & 29) from back
plate (22 or 27).
4. Use a plastic mallet and tap back plate (22 or 27) to
loosen it.
5. Remove O-ring (21) from back plate.
6. Remove complete piston block assembly from
housing assembly.
7. Remove piston assemblies (11), spider (12), and
pivot (130 from piston block assembly.
8. Piston block assembly need not be disassembled
unless pins (16) or spring (18) is damaged.
UNCONTROLLED OBJECTS CAN CAUSE EYE DAMAGE AND
SERIOUS INJURY. SPRING (18) IS HIGHLY COMPRESSED. DO
NOT REMOVE SNA P RING (19) WITH OUT C OMPRESSING
SPRING. ALWAYS WEAR EYE PROTECTION.
The following parts are needed to disassemble piston
block:
2 each 3/8" I.D. x 1 1/8" O.D. flat washers.
1 each 3/8" x 3 1/4" N.C. cap screw.
1 each 3/8" N.C. nut.
Place one flat washer over 3/8" x 3 1/4" cap screw, and
place this through center of piston block. Place other
washer over cap screw and let it rest on three pins (16).
Screw on nut and compress spring inside piston block.
Use snap ring pliers to remove internal snap ring (19).
Remove bolt and two washers. Remove two washers (17),
spring (18), three pins (16), and pin keeper (15).
1. Remove thrust race (10) from housing.
2. Remove snap ring (1) from housing.
3. Remove shaft seal (2) from housing.
4. Remove washer (3) from housing.
5. Remove drive shaft (7 or 25) from housing.
6. Remove two snap rings (4), thrust washer (5), and
thrust bearing (6), from drive shaft.
7. On through shaft type assembly, remove snap ring (31)
and shaft seal (30) from back plate (27).