JLG 45e Service Manual - Manual (Page 63)

SECTION -
3120861 – JLG Lift – -37
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 cap screws securing the bear-
ing to the rotation box to separate the two for
inspection.
2. Installation.
a. Install bearing to rotation box with two cap
screws, so that fill plug of bearing is as close to
gear as bolt pattern will allow. Do not tighten cap
screws.
b. Line up high spot (blue) of bearing with center
tooth of worm gear. Set backlash to 0.20 - 0.25
mm. Tighten capscrews as shown in Figure 2-
33.
c. Apply Tribol Molub-Alloy 936 Open Gear Com-
pound to bearing and worm gear teeth.
d. Grease bearing with Mobilith SHC Bearing
Grease. Grease fitting is on inside wall of inner
race of bearing.
NOTE: If Tribol Molub-Alloy 936 Open Gear Compound or
Mobilith SHC Bearing Grease are not available,
Multi-Purpose Grease (MPG) can be substituted,
however the service interval will be shorter.
a. Using suitable lifting equipment, install bearing/
rotation box assembly to frame with soft spot
(red) 90 degree relative to load axis. If reusing
old bearing, ensure that scribed line of outer
race of the bearing aligns with the scribed mark
on the frame.
JLG INDUSTRIES RECOMMENDS THAT ALL REMOVED GRADE 8
BEARING NUTS AND BOLTS BE DISCARDED AND REPLACED
WITH NEW NUTS AND 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 ATTACH-
MENT BOLTS, THE TORQUE SETTING ACCURACY OF THE TOOL
SHOULD BE CHECKED PRIOR TO USE.
c. Following the torque sequence diagram shown
in Figure 2-33, tighten the bolts to an initial
torque of 237 Nm. Then following the same
sequence, tighten to a final torque of 326 Nm.
d. Remove lifting equipment from bearing.
e. Use suitable lifting equipment to carefully posi-
tion the turntable assembly above the machine
frame.
f. Carefully lower the turntable onto the swing
bearing. Ensure that the scribed line of the inner
race of the bearing aligns with the scribed mark
on the turntable. If a new swing bearing is used,
ensure that the filler plug fitting is at 90 degrees
from the fore and aft centerline of the turntable.
g. Apply a light coating of Loctite 271 to the new
bearing bolts and install through the turntable
and inner race of bearing.
h. Following the torque sequence shown in Figure
2-33, tighten the bolts to an initial torque of 237
Nm. Then following the same sequence, tighten
the bolts to 240 ft. lbs (326 Nm).
i. Remove the lifting equipment.