JLG E300 Service Manual - Manual (Page 65)

SECTION 3 - CHASSIS & TURNTABLE
3120772 – JLG Lift – 3-31
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 0.008 -
0.010 inch (0.20 - 0.25 mm). Tighten cap screws
as shown in Figure 2-24.
c. Spray Mobiltac 375NC open gear spray onto
gear teeth.
d. Apply Tribol Molub-Alloy 936 Open Gear Com-
pound to bearing.
e. 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.
f. 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 TURN-
TABLE, IT IS IMPERATIVE THAT SUCH REPLACEMENT HARD-
WARE MEETS JLG SPECIFICATIONS. USE OF GENUINE JLG
HARDWARE IS HIGHLY RECOMMENDED.
g. 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.
h. Following the torque sequence diagram shown
in Figure 2-24, tighten the bolts to an initial
torque of 175 ft. lbs. (237 Nm). Then following
the same sequence, tighten to a final torque of
240 ft. lbs. (326 Nm).
i. Remove lifting equipment from bearing.
j. Use suitable lifting equipment to carefully posi-
tion the turntable assembly above the machine
frame.
k. 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.
l. Apply a light coating of Loctite 271 to the new
bearing bolts and install through the turntable
and inner race of bearing.
m. Following the torque sequence shown in Figure
2-24, tighten the bolts to an initial torque of 175
ft. lbs. (237 Nm). Then following the same
sequence, tighten the bolts to 240 ft. lbs (326
Nm).
n. Remove the lifting equipment.
o. Route hydraulic lines through center of turntable
and frame and connect as tagged prior to
removal.
p. Using all applicable safety precautions, activate
the hydraulic system and functionally check
swing system for proper and safe operation.