JLG 660AJ Service Manual - Manual (Page 88)

SECTION 3 - CHASSIS & TURNTABLE
3-44 – JLG Lift – 3121616
a. Carefully lower turntable onto swing bearing.
Ensure scribed line of inner bearing race aligns with
scribed line on turntable. If a new swing bearing is
used, ensure filler plug fitting is 90° fore and aft cen-
ter line of turntable.
b. Clean residue off new bearing bolts, then apply a
light coating of Loctite #271. Install bolts and wash-
ers through turntable and bearing inner race.
c. Following Torque Sequence diagram shown in Fig-
ure 3-60., Swing Bearing Torque Sequence, torque
bolts to 190 ft-lb (258 Nm) w/Loctite.
d. Remove lifting equipment.
e. Install rotary coupling retaining yoke brackets.
Apply a light coating of Loctite #242 to attaching
bolts and secure yoke to turntable with mounting
hardware.
f. Connect hydraulic lines to rotary coupling as tagged
prior to removal.
g. At ground control station, use boom lift control to
lower boom to stowed position.
h. Using all applicable safety precautions, activate
hydraulic system and check swing system for proper
and safe operation.
Swing Bearing Torque Values
1. Outer Race - 190 ft-lb (258 Nm) w/Loctite.
2. Inner Race - 190 ft-lb (258 Nm) w/Loctite.
3. See Figure 3-60. Swing Bearing Torque Sequence.
CHECK INNER AND OUTER SWING BEARING BOLTS FOR MISSING OR LOOSE-
NESS AFTER FIRST 50 HOURS OF OPERATION AND EVERY 600 HOURS THERE-
AFTER.






 






 



















Figure 3-60. Swing Bearing Torque Sequence