JLG M4069 Service Manual - Manual (Page 83)

SECTION 4 - HYDRAULICS
3121639 – JLG Lift – 4-11
Oscillating Axle Lockout Test (If Equipped)
LOCKOUT SYSTEM TEST MUST BE PERFORMED QUARTERLY,
ANY TIME A SYSTEM COMPONENT IS REPLACED, OR WHEN
IMPROPER SYSTEM OPERATION IS SUSPECTED.
NOTE: Ensure platform is fully lowered prior to beginning
lockout cylinder test.
1. Place a 6 inch (15.2 cm) high block with ascension
ramp in front of left rear wheel.
2. From platform control station, select LOW drive
speed.
3. Place DRIVE control switch to FORWARD position
and carefully drive the machine up ascension ramp
until left rear wheel is on top of block.
4. Raise machine platform approximately 7 ft (2.1 m)
on the 3369LE or 9 ft (2.7 m) on the 4069LE.
5. Place DRIVE control switch to REVERSE position
and carefully drive the machine off the block and
ramp.
6. Have an assistant check to see that the left rear
wheel remains locked in position off the ground.
7. Lower the machine platform; the lockout cylinder
should then release and allow wheel to rest on the
ground. It may be necessary to activate DRIVE to
release cylinders.
8. Place the 6 inch (15.2 cm) high block with ascension
ramp in front of right rear wheel.
9. From platform control station, select LOW drive
speed.
10. Place DRIVE control switch to FORWARD position
and carefully drive the machine up ascension ramp
until right rear wheel is on top of block.
11. Raise machine platform approximately 7 ft (2.1 m)
on the 3369LE or 9 ft (2.7 m) on the 4069LE.
12. Place DRIVE control switch to REVERSE position
and carefully drive the machine off the block and
ramp.
13. Have an assistant check to see that the right rear
wheel remains locked in position off the ground.
14. Lower the machine platform; the lockout cylinder
should then release and allow wheel to rest on the
ground. It may be necessary to activate DRIVE to
release cylinders.
15. If the lockout cylinders do not function properly,
have qualified personnel correct the malfunction
prior to any further operation.