JLG 660AJ Service Manual - Manual (Page 74)

SECTION 3 - CHASSIS & TURNTABLE
3-30 – JLG Lift – 3121616
Oscillating Axle Lockout Test
LOCKOUT SYSTEM TEST MUST BE PERFORMED QUARTERLY, ANY TIME A SYS-
TEM COMPONENT IS REPLACED, OR WHEN IMPROPER SYSTEM OPERATION IS
SUSPECTED.
NOTE: Ensure boom is fully retracted, lowered, and centered
between drive wheels before starting lockout cylinder test.
1. Place a 6 inch (15.2 cm) high block with ascension ramp
in front of left front wheel.
2. From platform control station, activate machine hydrau-
lic system.
3. Place FUNCTION SPEED CONTROL and DRIVE SPEED/
TORQUE SELECT control switches to their respective
LOW positions.
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 con-
trol lever to REVERSE. Drive machine off block and ramp.
7. Have an assistant check if 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 position, lockout
cylinders should release and allow wheel to rest on
ground. It may be necessary activate DRIVE to release
cylinders.
9. Place 6 inch (15.2 cm) high block with ascension ramp in
front of right front wheel.
10. Place DRIVE control lever to FORWARD and carefully
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 con-
trol lever to REVERSE. Drive machine off block and ramp.
13. Have an assistant check if 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 position, lockout
cylinders should release and allow wheel to rest on
ground. It may be necessary activate DRIVE to release
cylinders.
15. If lockout cylinders do not function properly, have quali-
fied personnel correct malfunction before further opera-
tion.
3.6 STEER ADJUSTMENTS
NOTE: 2 Wheel Steering/2 Wheel Drive: Spindles do not stop on
cylinder stroke. Adjust steering stops as follows: Adjust item
#1 to achieve 44° inside turn angles. Steer full left and
adjust RH item #2 to contact axle. Steer full right and adjust
LH item #2 to contact axle.
2 Wheel Steering/Four Wheel Drive: Spindles do not stop on
cylinder stroke. Adjust steering stops as follows: Adjust item
#1 to achieve 39° inside turn angles. Steer full left and
adjust RH item #2 to contact axle. Steer full right and adjust
LH item #2 to contact axle.
Figure 3-40. Steer Adjustments