JLG 150HAX ANSI Service Manual - Manual (Page 52)

SECTION 3 - CHASSIS & TURNTABLE
3-14 – JLG Lift – 3120679
3.3 DRIVE BRAKE - MICO - MACHINES
BUILT MARCH 1992 TO S/N 33476
Disassembly
1. Separate end cover (2) from housing (21) by remov-
ing capscrews (1).
END COVER IS UNDER SPRING TENSION OF APPROXIMATELY
907 KG. THE FOUR BOLTS SHOULD BE LOOSENED EVENLY TO
RELIEVE THIS FORCE. IF A HYDRAULIC PRESS IS AVAILABLE
(3,000 LBS. (1,360 KG) MINIMUM), THE COVER CAN BE HELD IN
POSITION WHILE REMOVING THE CAPSCREWS AND LOCKWASH-
ERS.
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).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).