JLG 80HX_HX+6_HXER ANSI Service Manual User Manual
Page 52
SECTION 3 - CHASSIS & TURNTABLE
3-14
– JLG Lift –
3120271
5.
Using a shop press install seal (4) by pressing
evenly around O.D. of seal. Use care to avoid cock-
ing.
6.
Install shaft (7) into housing. Support the inner race
of bearing (3) when pressing shaft into bearing.
7.
Install gasket 2. Align properly. After installing all the
remaining internal components of the brake, install
bearing (18). Properly support the shaft when press-
ing the bearing onto shaft.
8.
Install the power plate sub-assembly. Use a shop
press to evenly lower plate into position. There
should be no gap at the O.D. when the power plate
is properly seated against housing. If a shop press is
not available, use the assembly bolts (22). Tighten
sequentially one turn at a time until the power plate
is properly seated. Torque to 50-60 ft. lbs. (68-81
NM).
9.
If replacement of pressure relief valve is necessary,
install 1/2 to 3/4 turns beyond finger tight.
10.
Bleed air from brake via bleeder screw.
3.5
DRIVE BRAKE, MICO - MACHINES BUILT
FROM 1992 TO PRESENT
Disassembly
1.
Remove end cover (13) from housing (7) by remov-
ing capscrews (12).
END COVER IS UNDER SPRING TENSION OF APPROXIMATELY
2000 POUNDS (907 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.
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 (20), back-up ring (21), o-ring (18)
and back-up ring (19) from piston (24).
5.
Remove separators (10) from housing (7).
6.
Remove stack assembly, consisting of shaft (4),
return plate (8), and friction discs (22), from housing
(7).
7.
Remove dowel pins (17), springs (5,6) and spring
guide (16) from housing (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) and bearing (2) from
shaft (4).
11.
Press rotary oil seal (1) from housing (7).
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.
Clean all parts thoroughly before assembly.
2.
Press new rotary oil seal (1) into housing (7). Note
direction of seal.
3.
Install new bearing (2) and retaining ring (15) on
shaft (4).
4.
Insert shaft assembly and retaining ring (3) in hous-
ing (7).