JLG 600SC_660SJC Service Manual - Manual (Page 38)

SECTION 3 - TURNTABLE
3-8 – JLG Lift – 3120898
3.5 SWING BRAKE - MICO
Disassembly
1. With shaft protrusion downward, remove end cover
(13) by removing capscrews (12).
END COVER IS UNDER SPRING TENSION OF APPROXIMATELY
2000 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. Remove case seal (11) from housing (7) then
remove bleeder screw (14) from end cover (52).
3. Remove piston (22) from end cover (13).
4. Remove o-ring (17), back-up ring (16), o-ring (19)
and back-up ring (18) from piston (22).
5. Remove separators (10) from housing (52).
6. Remove stack assembly, consisting of discs (21),
return plate (8) and friction discs (20) from housing
(52).
7. Remove dowel pins (15), springs (5 & 6) from hous-
ing (52).
8. Remove retaining ring (3) from housing (52).
9. Remove shaft by pressing or using a soft mallet on
male end of shaft (51).
10. Remove retaining ring (54) bearing (2) from shaft
(51).
11. Press rotary seal (1) from housing (51).
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 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. Press new rotary seal (1) into housing (52). Note the
direction of seal.
2. Install new bearing (2) on shaft (51).
3. Install shaft assembly and retaining ring (3) into
housing (52).
Figure 3-7. Swing Bearing Torque Sequence