JLG 150HAX ANSI Service Manual - Manual (Page 54)

SECTION 3 - CHASSIS & TURNTABLE
3-16 – JLG Lift – 3120679
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 SUPPLEMENTAL
CLAMPING.
3.4 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 LOCKWASHERS.
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).