JLG 120HX Service Manual - Manual (Page 65)

SECTION 2 - PROCEDURES
3120819 – JLG Lift – 2-43
18. Position outer thrust washer (8), thrust bearing (9)
and thrust washer (8) in cover (1).
19. Position cover (1) on ring gear (7) with oil check
plug (5) in cover located at 90° from oil fill plugs (25
and 26) in hub (24).
20. Install four shoulder bolts (3) and lockwashers (4)
into appropriate counterbored holes in hub (24).
21. Install eight bolts (2) which attach cover (1) to ring
gear (7) and hub (24) and tighten to a torque of 31-
37 Nm (23-27 ft. lb.).
22. Carefully install hub pinion gear on splined output
shaft. If necessary, gently tap into position with a soft
headed mallet.
23. Apply No. 2 Lift Grade Loctite to pinion gear retain-
ing plate screws.
24. Position gear retaining plate and install attaching
screws.
25. Remove oil fill plug (25 or 26) and fill hub assembly
with approximately one quart of approved extreme
pressure gear lubricant. Install fill plug.
2.20 SWING BRAKE
1. Separate end cover (2) from housing (21) by remov-
ing capscrews (1).
END COVER IS UNDER SPRING TENSION OF APPROXIMATELY
2,000 LB. (907 KG). THE FOUR BOLTS SHOULD BE LOOSENED
EVENLY TO RELIEVE THIS FORCE. IF A HYDRAULIC PRESS IS
AVAILABLE (1,360 KG [3,000 LB.] MINIMUM), THE COVER CAN BE
HELD IN POSITION WHILE REMOVING THE CAPSCREWS AND
LOCKWASHERS.
2. Remove case seal (4) from the housing (21), then
remove bleeder screw (3) from the end cover (2).
3. Remove piston (7) from end cover (2).
4. Remove o-ring (5), back-up ring (6), o-ring (8) and
back-up ring (9) from piston (7).
5. Remove separators (13) from housing (21).
6. Remove stack assembly, consisting of discs (11),
return plate (14) and friction discs (12) from housing
(21).
NOTE: Not all models use the same number of springs or
spring pattern. Record this information for assembly
purposes. Spring retainer (17) was not used in ear-
lier models.
7. Remove dowel pins (20), springs (15 & 16) and
spring retainer (17) from housing (21).
8. Remove retaining ring (18) from housing (21).
9. Remove shaft by pressing or using a soft mallet on
male end of shaft (10).
NOTE: Earlier models did not use retaining ring (22).
10. Remove retaining ring (22) and bearing (19) from
shaft (10).
11. Press Rotary oil seal (23) from housing (21).
Cleaning and Inspection
1. Clean all parts thoroughly.
2. Closely inspect all parts for excessive wear, cracks,
and chips. Replace parts as necessary.
3. Discard seals and o-rings.
4. Closely inspect bearings and bearing contact sur-
faces. Replace as necessary.
NOTE: Bearings may be reused if, after thorough inspection,
they are found to be in good condition.
Assembly
NOTE: Lubricate all seals and o-rings with clean hydraulic
oil prior to assembly.
1. Clean all parts thoroughly before assembly.
2. Press new rotary oil seal (23) into housing (21). Note
direction of the seal.
NOTE: Earlier models did not use retaining ring (22).
3. Install new bearing (19) and retaining ring (22) on
shaft (10).
4. Insert shaft assembly and retaining ring (18) in hous-
ing (21).
NOTE: Be sure to use the same number of springs and
spring pattern as recorded during disassembly.
Spring retainer (17) was not used in earlier models.
5. Insert dowel pins (20), spring retainer (17) and
springs (15 & 16) in housing (21).
6. Position new large diameter return plate (14) in
housing with tabs guided by dowel pins (20) until
disc rests on springs (15 & 16).
DISCS (11, 14) AND FRICTION DISCS (12) SHOULD REMAIN DRY
DURING INSTALLATION. NO OIL RESIDUE SHOULD BE ALLOWED
TO CONTAMINATE DISC SURFACES.