JLG 80HX_HX+6_HXER ANSI Service Manual - Manual (Page 74)

SECTION 3 - CHASSIS & TURNTABLE
3-36 – JLG Lift – 3120271
5. Attach suitable overhead lifting equipment to the
base of the turntable weldment.
6. 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 bearing upon
installation. Remove the bolts, nuts and washers
which attach the turntable to the bearing inner race.
Discard the nuts and bolts.
7. 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.
8. Carefully place the turntable on a suitably supported
trestle.
9. 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 installation. 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 from the
frame, move the bearing to a clean, suitably sup-
ported work area.
Installation.
NOTE: Steps 1 thru 13 apply only to machines built prior to
mid 1991.
NOTE: Manufacturing tolerances of frames and turntables
are inspected prior to the factory installation of swing
bearings to determine the need for use of Devcon
filler. When servicing machine swing bearing, apply
Devcon filler only to those machines having Devcon
previously applied at the factory. If a new turntable or
frame is being installed, contact the manufacturer for
procedures to determine the need for Devcon appli-
cation.
1. Use suitable standard tools and equipment to care-
fully remove any hardened epoxy residue from the
bearing mounting area of the frame and turntable.
2. Apply a layer of Devcon (or equivalent) filler approxi-
mately 0.125 inches (0.318 cm) thick on the bearing
mounting plate on the frame.
3. 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 fit-
ting is at 90 degrees from the fore and aft centerline
of the frame.
4. Ensure that all frame and bearing attachment holes
are aligned, and install four diametrically opposed
bolts or clamps to secure the bearing to the frame.
Tighten the bolts or clamps evenly in a diametrically
opposed pattern to a torque of 20 ft. lbs. (3 kgm).
5. Allow Devcon filler to cure at room temperature
(approximately 70 degrees F., 21 degrees C.) for 10
to 16 hours.
6. After the appropriate interval, release the clamps or
remove the bolts. Use a suitable lifting device to
carefully remove the bearing from the frame.
7. Carefully remove any excess filler from the frame
mounting area, from the bearing attachment holes,
and from between the gear teeth.
ENSURE THE 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.
8. Apply a layer of Devcon (or equivalent) filler approxi-
mately 0.125 inches (0.318 cm) thick to the under-
side of the bearing mounting area of the turntable
base plate.