JLG 110HX ANSI Service Manual - Manual (Page 69)

SECTION 2 - PROCEDURES
3120636 – JLG Lift – 2-45
f. After the appropriate interval, release the clamps
or remove the bolts. Use a suitable lifting device
to carefully remove the bearing from the frame.
g. Carefully remove any excess filler from the frame
mounting area, from the bearing attachment
holes, and from between the gear teeth.
ENSURE THAT TURNTABLE IS ADEQUATELY SUPPORTED WHILE
APPLYING DEVCON AND WHILE INSTALLING THE BEARING.
EXTREME CARE MUST BE TAKEN DURING THE FOLLOWING
STEPS TO AVOID SERIOUS OR FATAL INJURY TO PERSONNEL.
h. Apply a layer of Devcon (or equivalent) filler
approximately 1/8 in. (3 mm) thick to the under-
side of the bearing mounting area of the turnta-
ble base plate.
i. Use suitable hydraulic jacks to carefully raise the
swing bearing to the underside of the turntable
mounting plate. 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. See Figure 2-20., Swing Bearing
Bolt Torquing Sequence).
j. Ensure that all turntable and bearing attachment
holes are aligned, and install four (4) diametri-
cally opposed clamps or bolts and nuts to
secure the bearing to the turntable. Tighten the
nuts and bolts or clamp evenly in a diametrical
pattern to a torque of 20 ft. lb. (27 Nm).
k. Allow the Devcon filler to cure at room tempera-
ture (approximately 70 degrees F [21 degrees
C]) for 10 to 16 hours.
l. After the appropriate interval, place a suitable
hydraulic jack under the bearing and release the
clamps or remove the nuts and bolts; use the
hydraulic jack to carefully remove the bearing
from the turntable.
m. Carefully remove excess filler from the turntable
mounting area, from the bearing attachment
holes and from between the gear teeth.
n. Position the bearing on the machine frame in the
same position as noted in step c above.
o. Use suitable lifting equipment to carefully lower
the swing bearing into position on the frame.
Ensure that the scribed line of the outer race of
the bearing aligns with the scribed mark 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 centerline of the frame).
JLG INDUSTRIES RECOMMENDS THAT ALL REMOVED 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.
p. Apply a light coating of Loctite #277 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.
q. Following the Torque Sequence diagram shown
in Figure 2-20., tighten the bolts to an initial
torque of 180 ft. lbs. (244 Nm). Then following
the same sequence tighten the bolts to a final
torque of 240 ft. lbs. (325 Nm).
r. Remove the lifting equipment from the bearing.
s. Use suitable lifting equipment to carefully posi-
tion the turntable assembly above the machine
frame.
t. Carefully lower the turntable onto the swing
bearing, ensuring that the turntable and bearing
align as noted in step i above.
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.
u. Apply a light coating of Loctite #277 to the new
bearing bolts, and install the bolts, washers and
nuts through the turntable and inner race of the
bearing.
v. Following the Torque Sequence diagram shown
in Figure 2-20., Swing Bearing Bolt Torquing
Sequence, tighten the bolts to an initial torque of
180 ft. lbs. (244 Nm). Then following the same
sequence tighten the bolts to a final torque of
240 ft. lbs. (325 Nm).
w. Remove the lifting equipment.
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