JLG 1250AJP Service Manual - Manual (Page 63)

SECTION 3 - 1CHASSIS & TURNTABLE
3121171 – JLG Lift – 3-15
Oscillating Axle Lockout Test
The front axles will oscillate when the boom is in the trans-
port position.
NOTE: The machine is in transport mode until one of the
following three factors are exceeded:
Main boom extended more than 4 ft. (1.2 m)
OR
Main boom 6° above horizontal (w/tower stowed
OR
Tower above horizontal.
LOCKOUT SYSTEM TEST MUST BE PERFORMED QUARTERLY,
ANY TIME A SYSTEM COMPONENT IS REPLACED, OR WHEN
IMPROPER SYSTEM OPERATION IS SUSPECTED.
NOTE: Ensure booms are fully retracted, lowered, and cen-
tered between drive wheels prior to beginning lock-
out cylinder test. The axles must also be fully
extended.
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
hydraulic 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. Telescope the boom out of the transport position.
6. Drive machine off of block and ramp back onto the
level surface.
7. Have an assistant check to see that left front wheel
remains locked in position off of ground.
8. Retract the boom back in to the transport position.
Activate drive and the lockout cylinders should
release.
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. Telescope the boom out of the transport position.
12. Drive machine off of block and ramp back onto the
level surface.
13. Have an assistant check to see that right front wheel
remains locked in position off of ground.
14. Retract the boom back in to the transport position.
Activate drive and the lockout cylinders should
release.
15. If lockout cylinders do not function properly, have
qualified personnel correct the malfunction prior to
any further operation.