JLG 80HX_HX+6_HXER ANSI Service Manual User Manual
Page 48
SECTION 3 - CHASSIS & TURNTABLE
3-10
– JLG Lift –
3120271
5.
Rotating discs (12) must be clean and dry, with no
presence of oil on any lining material or mating sur-
face or the stationary discs 13.
6.
Install bolts (23). Tighten sequentially one turn at a
time, until power plate (20) is properly seated.
Torque to 50-60 ft. lbs. (68-81 NM).
3.3
DRIVE BRAKE, MICO - MACHINES BUILT
PRIOR TO OCTOBER 1987
Disassembly
1.
Remove end cover (4) from housing (25) by remov-
ing capscrews (1) and lockwashers 2.
END COVER IS UNDER SPRING TENSION OF APPROXIMATELY
1500 POUNDS (681 KG). THE FOUR CAPSCREWS SHOULD BE
LOOSENED EVENLY TO RELIEVE THIS FORCE. IF A HYDRAULIC
PRESS IS AVAILABLE (3000 LBS (1362 KG) MAXIMUM), THE
COVER CAN BE HELD IN POSITION WHILE REMOVING THE CAP-
SCREWS AND LOCKWASHERS.
2.
Tap cover with a soft mallet in order to dislodge
bearing (7) from cover.
3.
Remove o-ring (6), square ring (5), pipe plug (3) and
bleeder screw (13) from end cover.
4.
Remove piston (10) from end cover by inserting two
1/4-20 UNC bolts into threaded holes in piston. By
turning and pulling, piston can be removed from
bore.
5.
Remove o-ring (8), back-up ring (9), o-ring (11) and
back-up ring (12) from piston (24).
6.
Remove separators (18) from housing (25).
7.
Remove shaft assembly, consisting of shaft (14),
discs (15,19), and friction discs (17), springs (16)
and bearings (7,23), from housing by pressing or
using a soft mallet on male end of shaft.
8.
Remove springs (16) from between tabs of discs
(15,19).
9.
Remove bearings (7,23) from shaft using an appro-
priate bearing puller. The discs and friction discs will
then slide off either end of shaft.
10.
Remove dowel pins (22), springs (20,21) and oil seal
(24) from housing (25).
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 re-used if, after thorough inspec-
tion, 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 oil seal (24), dowel pins (22) and springs
(20,21) in housing (25).
2.
Install new bearing (23) on male end of shaft (14)
and press until it shoulders on shaft.
3.
Insert shaft and bearing on housing (25) and press
until bearing bottoms on shoulder in housing.
4.
Position large diameter disc (19) in housing, with
tabs guided by dowel pins (22), until disc rests on
springs (20,21).
DISC (15,19) AND FRICTION DISCS (17) SHOULD REMAIN DRY
DURING INSTALLATION. NO OIL RESIDUE SHOULD BE ALLOWED
TO CONTAMINATE DISC SURFACES.
5.
Place friction disc (17) on shaft until it contacts bot-
tom disc (19). Insert one spring (16) on each dowel
pin (22).