User Manual

SECTION 2 - PROCEDURES
2-28 – JLG Lift – 3120884
4. If a difference less than 1. 40 mm (0.057 in.) is d eter-
mined, and any of the following conditions exist, the
bearing should be removed.
a. Metal particles in the grease.
b. Incre ased drive power.
c. Noise.
d. Rough rotation.
5. If bearing inspection shows no defects, reassemble
bearing and return to service.
Replacement of Swing Bearing
1. Removal.
a. Attach an adequate support sling to the boom
and draw al l slack from slin g. Prop or block the
boom if feasible.
b. Tag and disconnect hydraulic lines running
through center of turntable and frame. Use a
suitable container to retain any residual hydrau-
lic fluid. Ca p lines and ports.
c. Attach suitable overhead lifting equipment to the
base of turn table weldment .
d. Use a suitable tool to scribe a line on the inner
race of the swing bearing and on the unders ide
of the turntable. This will aid in ali gn ing the bear-
ing upon installation. Remove bolts, nuts and
washers which attach the turntable to the bear-
ing inner race. Discard nuts and bolts.
e. Use the lifting eq uipm ent to carefully lif t the com-
plete turntable assembly from the bearing.
Ensure that no damage occurs to the turntable,
beari n g or frame mounted compon ents.
f. Carefully place the turntable on a suitably sup-
ported trestle.
g. 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
Figure 2 -31. Swing Bearing Tolerance Boom Placement