JLG 110HX Service Manual - Manual (Page 87)

SECTION 2 - PROCEDURES
3120864 – JLG Lift – 2-63
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. Insert new o-ring (55), dowel pins (53) and springs
(51, 52) in housing (56).
2. Install new bearing (54) in housing and press until
bearing bottoms on shoulder in housing.
3. Position new large diameter disc (50) in housing
with tabs guided by dowel pins (53) until disc rests
on springs (51, 52).
DISCS (46,50) AND FRICTION DISCS (48) SHOULD REMAIN DRY
DURING INSTALLATION. NO OIL RESIDUE SHOULD BE ALLOWED
TO CONTAMINATE DISC SURFACES.
4. Place a new friction disc (48) on bottom disc (50),
centering it as closely as possible. Insert one spring
(47) on each dowel pin.
5. Add additional new discs (46), new friction discs
(48) and springs (47) as required for specific model.
6. Install snap ring (44) on shaft (45). Insert shaft (45)
thru friction discs (48) until shaft contacts bearing
(54). Press shaft (45) until it shoulders on inner race
of bearing. A small preload will exist on snap ring
(44) at this point.
7. Insert separators (49) over spiral pins in housing
(56). Separators will contact top of bottom disc (50)
when properly installed.
8. Install new o-ring (38), new back-up ring (39), new o-
ring (41) and new back-up ring (42) on piston (40).
Insert piston (40) into end cover (34), being careful
not to shear o-rings or back-up rings. Inserting 1/4-
20 UNC bolts in piston may simplify installation.
9. Install new o-ring (36), new bearing (37), new square
ring (35), pipe plug (33) and bleeder screw (43) in
end cover.
10. Position end cover (34) on housing, aligning dowel
pin (53) with holes in end cover.
11. Install capscrews (31) and lockwashers (32). Tighten
evenly to draw end cover (34) to housing and bear-
ing (37) onto shaft (45). Torque capscrews to 68 Nm.
NOTE: If available, a hydraulic press will simplify installation
of end cover on housing. Clamp cover in position
while tightening capscrews.
12. 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).
PRESS FORCE SHOULD BE LIMITED TO 907 KG MAXIMUM TO
AVOID POSSIBLE DAMAGE TO SNAP RING (44).
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.
2.23 SWING BRAKE - MACHINES BUILT 1992
TO PRESENT
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
(1,360 KG 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).