JLG 110HX ANSI Service Manual - Manual (Page 95)

SECTION 2 - PROCEDURES
3120636 – JLG Lift – 2-71
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.
7. Place a new friction disc (12) on shaft (10) until it
contacts return plate (14).
8. Add additional new discs (11) and new friction discs
(12) as required to complete assembly.
9. Insert separators (13) in holes of return plate.
10. Install new o-ring (5), new backup ring (6), new o-
ring (8) and new back-up ring (9) on piston (7). Note
order of o-rings and back-up rings. Insert piston (7)
into end cover (2) being careful not to shear o-rings
or back-up rings.
11. Install new case seal (4) in housing (21) then install
bleeder screw (3) in end cover (2).
12. Position end cover (2) on housing (21) aligning
dowel pins (20) with holes in end cover.
NOTE: If available, a hydraulic press will simplify installation
of end cover on housing. Clamp cover in position
while tightening capscrews.
13. Press on inner ring of bearing (37) until it shoulders
on shaft (45) to eliminate binding on bearings. Be
certain to restrain opposite end of shaft to avoid
excessive thrust loading on bearing (54).
IF HYDROSTATIC BENCH TESTING IS PERFORMED ON THE
BRAKE ASSEMBLY, RELEASE PRESSURE SHOULD NOT EXCEED
138 BAR UNLESS TWO ADDITIONAL BOLTS ARE USED FOR SUP-
PLEMENTAL CLAMPING.
2.26 DRIVE BRAKE - MICO - MACHINES
BUILT S/N 33476 TO PRESENT
Disassembly
1. With the shaft protrusion downward, remove end
cover (13) by removing capscrews (12).
END COVER IS UNDER SPRING TENSION OF APPROXIMATELY
681 KG. THE FOUR CAPSCREWS SHOULD BE LOOSENED
EVENLY TO RELIEVE THIS FORCE. IF A HYDRAULIC PRESS IS
AVAILABLE (1362 KG MAXIMUM), THE COVER CAN BE HELD IN
POSITION WHILE REMOVING THE CAPSCREWS AND LOCK-
WASHERS.
2. Remove case seal (11) from housing (7) then
remove bleeder screw (14) from end cover (13).
3. Remove piston (24) from end cover (13).
4. Remove o-ring (19), back-up ring (18), o-ring (21)
and back-up ring (20) from piston (24).
5. Remove separators (10) from housing (7).
6. Remove stack assembly, consisting of discs (23),
return plate (8) and friction discs (22) from housing
(7).
7. Remove dowel pins (17), springs (5 & 6) from hous-
ing (7).
8. Remove retaining ring (3) from housing (7).
9. Remove shaft by pressing or using a soft mallet on
male end of shaft (4).
10. Remove retaining ring (15) bearing (2) from shaft
(4).
11. Press rotary seal (1) from housing (7).