JLG 80HX_HX+6_HXER ANSI Service Manual - Manual (Page 79)

SECTION 3 - CHASSIS & TURNTABLE
3120271 – JLG Lift – 3-41
3.14 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.
3.15 FREE WHEELING OPTION
To Disengage Drive Motors and Brakes (Free
Wheel) for Towing, etc.
1. Chock wheels securely if not on flat level surface.
2. Disconnect both drive hubs by inverting disconnect
caps in center of hubs.
3. If equipped, move steer/tow selector valve to float
(tow) position by pulling valve knob out.
To Engage Drive Motors and Brakes (Normal
Operation)
1. If equipped, move steer/tow valve to steer position
by pushing valve knob in.
2. Connect both drive hubs by inverting disconnect
cap in center of hub.
3. Remove chocks from wheels as required.