JLG 600A_AJ Service Manual - Manual (Page 97)

SECTION 3 - CHASSIS & TURNTABLE
3121201 – JLG Lift – 3-47
4. Place DRIVE control lever to FORWARD position
and carefully drive machine up ascension ramp until
left front wheel is on top of block.
5. Carefully activate SWING control lever and position
boom over right side of machine.
6. With boom over right side of machine, place DRIVE
control lever to REVERSE and drive machine off of
block and ramp.
7. Have an assistant check to see that left front wheel
remains locked in position off of ground.
8. Carefully activate SWING control lever and return
boom to stowed position (centered between drive
wheels). When boom reaches center, stowed posi-
tion, lockout cylinders should release and allow
wheel to rest on ground, it may be necessary acti-
vate DRIVE to release cylinders.
9. Place the 6 inch (15.2 cm) high block with ascension
ramp in front of right front wheel.
10. Place DRIVE control lever to FORWARD and care-
fully drive machine up ascension ramp until right
front wheel is on top of block.
11. Carefully activate SWING control lever and position
boom over left side of machine.
12. With boom over left side of machine, place DRIVE
control lever to REVERSE and drive machine off of
block and ramp.
13. Have an assistant check to see that right front wheel
remains locked in position off of ground.
14. Carefully activate SWING control lever and return
boom to stowed position (centered between drive
wheels). When boom reaches center, stowed posi-
tion, lockout cylinders should release and allow
wheel to rest on ground, it may be necessary acti-
vate DRIVE to release cylinders.
15. If lockout cylinders do not function properly, have
qualified personnel correct the malfunction prior to
any further operation.
3.9 SWING HUB
Adjustment Procedures
NOTE: The swing bearing high spot is usually marked with a
colored paint.
1. Ensure swing drive is located on bearing gear max
eccentric tooth (high spot).
2. With mounting free to slide, shim between pinion
and bearing gear teeth to achieve 0.008 - 0.012 in.
(0.20 - 0.30 mm) backlash.
3. Install a pry bar into hole in turntable base plate and
pry swing hub back tight against shim and bearing.
4. Torque bolts according to the torque chart in Section
1.
Figure 3-41. Swing Torque Hub Adjustment