JLG 80HX_HX+6 Operator Manual - Manual (Page 72)

SECTION 4 - MACHINE OPERATION
3120890 – JLG Lift – 4-9
10. You are now ready to operate all machine functions.
11. To retract extendable axles:
a. Position STEER/AXLES valve located adjacent
to right front wheel to AXLES.
b. On machines with fixed axles, if retracting the
drive axles, remove the axle lock pins. If retract-
ing the steer axles, remove the tie rod lock pins,
steer cylinder pin and axle lock pins.
NOTE: It may be necessary to elevate the wheels and jog
the steer control for removal of lock pins.
c. Position the Jack Select Switch to either FRONT
JACK or REAR JACK and position the JACK
control switch to down and hold until the wheels
on the selected axle rise from the ground.
d. Position Steer/Axles/Jack control switch located
on platform control console to the right, until
axles are fully retracted.
e. On machines with fixed axles, if retracting the
steer axles, align the steer wheels and insert the
tie rod lock pins and steer cylinder pin. Install
axle lock pins.
ENSURE THE JACK IS FULLY RETRACTED BEFORE OPERATING
THE MACHINE. FAILURE TO DO SO COULD RESULT IN DAMAGE
TO THE MACHINE.
f. Position the JACK control switch to the UP posi-
tion to lower the machine. Ensure the jack is fully
retracted before operating the machine.
g. Repeat steps b thru f and retract the axles at the
opposite end of the machine.
4.12 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 boom is fully retracted, lowered, and cen-
tered between drive wheels prior to beginning lock-
out cylinder test.
1. Place a 15 cm high block with ascension ramp in
front of left front wheel.
2. From platform control station, start engine .
3. Place ENGINE SPEED, WHEEL MOTOR SPEED,
and PUMP VOLUME 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 15 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.