JLG 460SJ Service Manual - Manual (Page 95)

SECTION 3 - CHASSIS & TURNTABLE
3120895 – JLG Lift – 3-43
3.11 OSCILLATING AXLE BLEEDING
PROCEDURE
ENSURE PLATFORM IS FULLY LOWERED AND BOOM IS CEN-
TERED OVER REAR AXLE PRIOR TO BEGINNING BLEEDING PRO-
CEDURE.
MAKING SURE MACHINE IS ON A LEVEL SURFACE AND REAR
WHEELS ARE BLOCKED, DISENGAGE DRIVE HUBS. OPTIONAL
4WD ALL HUBS MUST BE DISENGAGED.
1. Making sure machine is on a level surface and rear
wheels are blocked, disengage drive hubs. Optional
4WD all hubs must be disengaged.
2. Make up an adapter with an air regulator, remove
filler cap on hydraulic tank and install regulator.
3. Attach air supply to the regulator and set regulator to
2 - 5 psi (0.14-0.34 Bar).
DO NOT EXCEED 5 PSI (0.34 BAR) INTO HYDRAULIC TANK. MORE
THAN 5 PSI (0.34 BAR) WILL CAUSE DAMAGE TO THE HYDRAU-
LIC TANK.
4. Activate machine hydraulic system from platform
control station.
5. Place LOW ENGINE, HIGH DRIVE SPEED and HIGH
WHEEL MOTOR SPEED control switches to their
respective HIGH positions.
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.
3.12 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 DRIVE control lever to FORWARD position
and carefully drive machine up ascension ramp until
left front wheel is on top of block.
4. Carefully activate SWING control lever and position
boom over right side of machine.
5. With boom over right side of machine, place DRIVE
control lever to REVERSE and drive machine off of
block and ramp.