JLG 80HX_HX+6_HXER Service Manual - Manual (Page 83)

SECTION 2 - PROCEDURES
3120863 – JLG Lift – 2-61
6. Depress footswitch and activate DRIVE CONTROL-
LER to “FORWARD” position.
7. Using a suitable lifting equipment lift front of
machine and place a 6 in. (15.2 cm) high block
under right front wheel.
8. Lower machine so both of the lockout cylinders are
oscillated; one extended, the other retracted.
9. Use suitable containers to retain any residual
hydraulic fluid, place containers under each lockout
cylinder.
10. With DRIVE CONTROLLER activated and engine at
idle, open all four bleeder screws (two on each lock-
out cylinder), one at a time, then close bleeder
screws when all air is dissipated (bled).
11. Using a suitable lifting equipment lift front of
machine and remove the 6 in. (15.2 cm) high block.
12. Transfer the 6 in. (15.2 cm) high block to the left front
wheel and repeat steps 2 thru 7, substituting the
word “right” for “left” in step 5.
13. Perform oscillating axle lockout test.
2.24 OSCILLATING AXLE LOCKOUT TEST
LOCKOUT SYSTEM TEST MUST BE PERFORMED QUARTERLY,
ANY TIME A SYSTEM COMPONENT IS REPLACED, OR WHEN
IMPROPER SYSTEM OPERATION IS SUSPECTED.
NOTE: Ensure boom is fully retracted, lowered, and cen-
tered between drive wheels prior to beginning lock-
out cylinder test.
1. Place a 6 in. (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 HIGH ENGINE, DRIVE SPEED and WHEEL
MOTOR SPEED 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
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). After boom reaches stowed position, acti-
vate DRIVE and lockout cylinders should release
and allow wheel to rest on ground.
9. Place the 6 in. (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). After boom reaches stowed position, acti-
vate DRIVE and lockout cylinders should release
and allow wheel to rest on ground.
15. If lockout cylinders do not function properly, have
qualified personnel correct the malfunction prior to
any further operation.
2.25 BASKET ROTATOR BRAKE
Torque belleville washers (4160026) to 140 ft. lbs. (190
NM).
Figure 2-37. Belleville Washers