JLG 660SJ Service Manual - Manual (Page 97)

SECTION 3 - CHASSIS & TURNTABLE
3120840 – JLG Lift – 3-47
j. Install the rotary coupling retaining yoke brack-
ets, apply a light coating of Loctite #242 to the
attaching bolts and secure the yoke to the turn-
table with the mounting hardware.
k. Connect the hydraulic lines to the rotary cou-
pling as tagged prior to removal.
l. At ground control station, use boom lift control
to lower boom to stowed position.
m. Using all applicable safety precautions, activate
the hydraulic system and check the swing sys-
tem for proper and safe operation.
Swing Bearing Torque Values
1. Outer Race - 326 Nm w/Loctite, 298 Nm dry.
2. Inner Race - 326 Nm w/Loctite, 298 Nm dry.
3. See Swing Bearing Torquing Sequence.
CHECK THE INNER AND OUTER SWING BEARING BOLTS FOR
MISSING OR LOOSENESS AFTER FIRST 50 HOURS OF OPERA-
TION, AND EVERY 600 HOURS THEREAFTER.
3.12 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
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 LOCK-
WASHERS.
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).
Figure 3-30. Swing Bearing Torque Sequence