JLG 150HAX Service Manual - Manual (Page 71)

SECTION 3 - CHASSIS & TURNTABLE
3120817 – JLG Lift – 3-33
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 2,000 LB. (907 KG) MAXI-
MUM 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 SUPPLEMENTAL
CLAMPING.
3.10 SWING BRAKE - MACHINES BUILT 1992
TO PRESENT
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 LB. [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).