JLG 80HX_HX+6_HXER ANSI Service Manual - Manual (Page 75)

SECTION 3 - CHASSIS & TURNTABLE
3120271 – JLG Lift – 3-37
9. 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 90 degrees
from the fore and aft centerline of the turntable).
10. Ensure that all turntable and bearing attachment
holes are aligned, and install four diametrically
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. lbs. (3 kgm).
11. Allow Devcon filler to cure at room temperature
(approximately 70 degrees F., [21 degrees C]) for 10
to 16 hours.
12. After the appropriate time 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.
13. Carefully remove excess filler from the turntable
mounting area, from the bearing attachment holes
and from between gear teeth.
14. Position the bearing on the machine frame in the
same position as noted in step 3 above.
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.
15. Spray a light coat of Safety Solvent 13 to the new
bearing bolts. Then 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.
16. Following the Torque Sequence diagram shown in
Figure 3-15., and torque the bolts. Refer to Swing
Bearing Torque Values in this section.
17. Remove the lifting equipment from the bearing.
Figure 3-14. Swing Bearing Tolerance Boom Placement