JLG 600SC_660SJC Service Manual - Manual (Page 151)

SECTION 6 - TURNTABLE
3121157 – JLG Lift – 6-5
e. Using suitable lifting equipment, carefully posi-
tion the turntable assembly above the machine
frame.
f. Carefully lower the turntable onto the swing
bearing, ensuring that the scribed line of the
inner race of the bearing aligns with scribed line
on the turntable. If a new swing bearing is used,
ensure that the filler plug fitting is at 90 degrees
from the fore and aft center line of the turntable.
g. Spray a light coat of Safety Solvent 13 on the
new bearing bolts. Then apply a light coating of
Loctite #271 to the new bearing bolts, and
install the bolts and washers through the turnta-
ble and inner race of the bearing.
h. Following the Torque Sequence diagram shown
in Figure 6-5., Swing Bearing Torque Sequence,
tighten the bolts to a torque of 240 ft. lbs. (326
Nm) w/Loctite.
i. Remove the lifting equipment.
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 - 240 ft. lbs. (326 Nm) w/Loctite.
2. Inner Race - 240 ft. lbs. (326 Nm) w/Loctite.
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.
6.3 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 inspec-
tion, they are found to be in good condition.