JLG 601S ANSI Service Manual - Manual (Page 83)

SECTION 3 - CHASSIS & TURNTABLE
3120746 – JLG Lift – 3-43
3.9 OSCILLATING AXLE BLEEDING
PROCEDURE AND LOCKOUT TEST
Lockout Cylinder Bleeding
ENSURE PLATFORM IS FULLY LOWERED AND BOOM IS CEN-
TERED OVER REAR AXLE PRIOR TO BEGINNING BLEEDING
PROCEDURE.
MAKING SURE MACHINE IS ON A LEVEL SURFACE AND REAR
WHEELS ARE BLOCKED, BRAKE WIRE IS DISCONNECTED.
1. Making sure machine is on a level surface and rear
wheels are blocked, brake wire is disconnected.
2. Center boom over rear axle making sure that cam
valve is depressed.
3. Using a Phillips screwdriver, remove screw from
connection on the brake valve and remove connec-
tor as shown.
4. Use suitable containers to retain any residual
hydraulic fluid, place containers under each lockout
cylinder.
5. Open all four bleeder screws (two on each lockout
cylinder).
6. Start the engine, position drive control lever on the
main hydraulic pump forward or reverse as shown.
7. Close bleeder screws when all air is dissipated
(bled).
8. Perform oscillating axle lockout test.
9. If necessary, repeat steps 1 thru 8.
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 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. Carefully activate SWING control lever and position
boom over right side of machine.
Figure 3-31. Oscillating Valve Adjustment
Figure 3-32. Brake Valve Wiring Connection
Figure 3-33. Drive Manual Control Valve