JLG T500J Service Manual - Manual (Page 90)

SECTION 3 - CHASSIS & TURNTABLE
3-54 – JLG Lift – 3121200
Swing Bearing Installation
1. Place the swing drive on a table.
2. Place the bearing on the housing making sure the
grease fitting is aligned in the proper location.
3. On the underside of the bearing, assemble two
screws loosely in the counterbored holes.
4. Put the crank in the worm bore and crank the worm
gear until the painted area of the bearing teeth is in
mesh with the worm.
5. Adjust the bearing until 0.010 - 0.015 inch (0.20 -
0.38 mm) backlash is achieved.
6. Tighten the screws in the counterbored holes.
7. Check that the 0.010 - 0.015 inch (0.20 - 0.38 mm)
backlash has been maintained when the painted are
of the bearing is in mesh with the worm.
8. Using suitable lifting equipment, carefully lower the
swing bearing into position on the frame. Ensure the
scribed line of the outer race of the bearing aligns
with the scribed line on the frame. If a new swing
bearing is used, ensure that the soft spot (stamped
with an "S") is in the vicinity shown below (90° rela-
tive to the load axis) before securing it to the turnta-
ble. If it is not, manually rotate the outer race using
the 7/8 hex until the soft spot is located as shown.
JLG INDUSTRIES RECOMMENDS THAT ALL REMOVED BEARING
BOLTS BE DISCARDED AND REPLACED WITH NEW BOLTS. SINCE
THE SWING BEARING IS THE ONLY STRUCTURAL LINK BETWEEN
THE FRAME AND TURNTABLE, IT IS IMPERATIVE THAT SUCH
REPLACEMENT HARDWARE MEETS JLG SPECIFICATIONS. USE
OF GENUINE JLG HARDWARE IS HIGHLY RECOMMENDED.
9. Apply a light coating of Loctite #271 to the new
bearing bolts, and loosely install the bolts and wash-
ers through the frame and outer race of bearing.
IF COMPRESSED AIR OR ELECTRICALLY OPERATED IMPACT
WRENCH IS USED FOR TIGHTENING THE BEARING ATTACHMENT
BOLTS, THE TORQUE SETTING ACCURACY OF THE TOOL SHOULD
BE CHECKED PRIOR TO USE.
Refer to the Torque Sequence diagram as shown in
Figure 3-18., Swing Bearing Torque Sequence.
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 frame and outer race of the
bearing. Tighten all bolts to an initial torque of 115
ft.lbs. (155 Nm) w/Loctite.
10. Remove the lifting equipment from the bearing.
11. Using suitable lifting equipment, carefully position
the turntable assembly above the machine frame.
12. 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.
13. 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
HIGH SPOT