JLG 18RS Service Manual - Manual (Page 70)

SECTION 3 - CHASSIS & TURNTABLE
3-32 – JLG Lift – 3121284
3.8 SWING BEARING
Description
The swing bearing has five major components: housing,
worm, worm gear, output pinion, and gear/pinion cap.
Servicing these units requires a press, sockets, torque wrench,
steel hammer, soft face hammer, bearing puller (external and
internal), and a large flat blade screw driver. Also needed are a
shim and seal kit (refer to JLG Parts Manual), 3/4" steel rod at
least 10" long, silicone sealant, Mobil SHC 460 grease, Lubri-
plate No. 930-AAA, JLG Threadlocker P/N 0100011 for bolts,
and other parts that may be worn out.
Turntable/Swing Bearing Removal
Refer to Figure 3-9., Swing Bearing Installation.
1. Place the machine on a firm, level surface.
2. Set the swing lock.
3. Remove the front hood assemblies. Attach a magnet or
other lifting device to support the weight of the hoods
and remove the bolts that secure them to the turntable.
4. Tag and disconnect the hydraulic lines running to the
swing motor. Cap or plug all openings.
5. Tag and disconnect the hoses on the right side of the
turntable at the drive valve. Cap or plug all openings.
Pull the hoses out through the hole in the right side of
the turntable.
6. Place a container suitable for catching hydraulic oil
under the machine. On the left side of the machine, tag
and disconnect the drive hoses at the pump. Cap or plug
all openings. Feed the hoses through the hole on the left
side of the turntable.
7. Attach chains or slings to the lifting lugs to support the
weight of the turntable.
8. Remove the bearing bolts securing the turntable to the
bearing.
9. Lift the turntable off of the chassis.
10. Place the turntable assembly on adequate blocking.
11. Remove the outer race bearing bolts from the underside
of the frame.
12. Install lifting eyes into the swing bearing for removal.
NOTE: The swing bearing weighs approximately 152 lbs. (68.6 kg).
13. Attach an adequate lifting device to the swing bearing
and remove it from the frame.
Installation
1. Install lifting eyes into the swing bearing for installation.
NOTE: The swing bearing weighs approximately 152 lbs. (68.6 kg).
2. Attach an adequate lifting device to the swing bearing
and place it onto the mounting holes on the frame.
Refer to Figure 3-7., Swing Motor Removal and Installa-
tion for proper bearing alignment.
3. Apply JLG Threadlocker Part No. 0100019 to new outer
race swing bearing bolts. Install the bolts and torque to
280 Nm (206.5 lbs.ft.) in the pattern shown in Figure 3-
11., Swing Bearing Torque Sequence.
4. Install guide pins into two of the inner race mounting
holes to help line up the turntable when it is installed.
5. Attach chains to the lifting lugs on the turntable.
NOTE: Properly balance the turntable assembly. Start with
20 ft. (6.0 m) chains to the front of the machine and
21 ft (6.4 m) chains to the rear of the machine (plat-
form end). Adjust the chains as necessary to achieve
proper balance.
6. Slowly lower the turntable and align it with the guide
pins.
7. Apply JLG Threadlocker Part No. 0100019 to new inner
race swing bearing bolts. Install the bolts and torque to
280 Nm (206.5 lbs.ft.) in the pattern shown in Figure 3-
11., Swing Bearing Torque Sequence.
8. Route the hydraulic hoses on the right side of the
machine into the hole on the turntable and connect
them to the drive valve as tagged during removal.
9. Route the drive hoses from the drive valve up to the
drive pump.
10. Connect the hoses to the drive pump as tagged during
removal.
11. Install the swing drive. Connect the hydraulic lines to the
swing drive as tagged during removal.
12. Install the hoods on the machine.