JLG 600SC_660SJC Service Manual - Manual (Page 150)

SECTION 6 - TURNTABLE
6-4 – JLG Lift – 3121157
f. Use a suitable tool to scribe a line on the inner
race of the swing bearing and on the underside
of the turntable. This will aid in aligning the bear-
ing upon installation. Remove the bolts and
washers which attach the turntable to the bear-
ing inner race. Discard the bolts.
g. Use the lifting equipment to carefully lift the com-
plete turntable assembly from the bearing.
Ensure that no damage occurs to the turntable,
bearing or frame-mounted components.
h. Carefully place the turntable on a suitably sup-
ported trestle.
i. Use a suitable tool to scribe a line on the outer
race of the swing bearing and the frame. This
line will aid in aligning the bearing upon installa-
tion. Remove the bolts and washers which
attach the outer race of the bearing to the frame.
Discard the bolts. Use suitable lifting equipment
to remove the bearing from the frame, then
move the bearing to a clean, suitably supported
work area.
2. Installation.
a. 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
filler plug fitting is at 90 degrees from the fore
and aft center line of the frame.
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.
b. Apply a light coating of Loctite #271 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.
c. Refer to the Torque Sequence diagram as
shown in Figure 6-5., 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 the
bolts to an initial torque of 240 FT. LBS. (326
Nm) w/Loctite.
d. Remove the lifting equipment from the bearing.
Figure 6-5. Swing Bearing Torque Sequence