Replacement of swing bearing, Replacement of swing bearing -41, Swing bearing tolerance boom placement -41 – JLG M400 ANSI Service Manual User Manual
Page 83: Dicated on figure 3-14. try and, Figure 3-14.), Boom fully elevated, (see figure 3-14.)
SECTION 3 - CHASSIS & TURNTABLE
3121125
– JLG Lift –
3-41
Replacement of Swing Bearing
1. Removal.
a. Attach an adequate support sling to the boom
and draw all slack from sling. 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. Cap lines and ports.
c. Attach suitable overhead lifting equipment to the
base of turntable weldment.
d. 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 bolts, nuts and
washers which attach the turntable to the bear-
ing inner race. Discard nuts and bolts.
e. 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.
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
attach the outer race of the bearing to the frame.
Discard the bolts. Use suitable lifting equipment
to remove the bearing and rotation box assem-
bly from the frame; move to a clean, suitably
supported work area.
h. Remove the two capscrews securing the bear-
ing to the rotation box to separate the two for
inspection.
Figure 3-14. Swing Bearing Tolerance Boom Placement