Swing Bearing Installation - JLG T500J Service And Maintenance Manual

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.
HIGH SPOT
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) back-
lash has been maintained when the painted are of the
bearing is in mesh with the worm.
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SECTION 3 - CHASSIS & TURNTABLE
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° relative to the load axis)
before securing it to the turntable. 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 DIS-
CARDED AND REPLACED WITH NEW BOLTS. SINCE THE SWING BEARING IS THE
ONLY STRUCTURAL LINK BETWEEN THE FRAME AND TURNTABLE, IT IS IMPER-
ATIVE THAT SUCH REPLACEMENT HARDWARE MEETS JLG SPECIFICATIONS.
USE OF GENUINE JLG HARDWARE IS HIGHLY RECOMMENDED.
9. Apply a light coating of JLG Threadlocker 0100019 to the
new bearing bolts, and loosely install the bolts and
washers 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 3-29., Swing Bearing Torque Sequence. Spray a light
coat of Safety Solvent 13 on the new bearing bolts. Then apply
a light coating of JLG Threadlocker 0100019 to the new bear-
ing bolts, and install the bolts and washers through the frame
and outer race of the bearing. Note the position of the two
shorter bolts as shown below. 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.
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