JLG 740AJ Operator Manual - Manual (Page 53)

SECTION 3 - MACHINE CONTROLS AND INDICATORS
3121295 – JLG Lift – 3-13
12. Work Lights. (If Equipped)
The switch, on the light, operates work lights if the
machine is so equipped. The power/emergency stop
switch must be on, (mushroom button out) but ignition
switch does not have to be on to operate the lights, so
care must be taken to avoid draining the battery if left
unattended. The master switch and / or the ignition
switch at the ground control will turn off power to all
lights.
13. Steer Select. (If Equipped)
When equipped with four wheel steering, the action of
the steering system is operator selectable. The center
switch position gives conventional front wheel steering
with the rear wheels unaffected. This is the best position
for normal driving at maximum speeds. The forward
position is for “crab” steering. When in this mode both
front and rear axles steer in the same direction, which
allows the chassis to move sideways as it goes forward.
This can be used for positioning the machine in aisle
ways or against buildings. The back switch position is
for “coordinated” steering. In this mode the front and
rear axles steer in the opposite directions to produce the
tightest turning circle for maneuvering in confined areas.
A decal located at top of switch, instructs the desired
wheel maneuver with the switch position.
To re-synchronize the front and rear axles, activate the
steer switch (thumb rocker) until all steer cylinders are at
the end of their stroke. This can be done in either crab or
coordinated mode.
14. Auxiliary Power
When pushed forward, the switch energizes the starter
motor to start the engine.
When pushed back, it energizes the electrically oper-
ated hydraulic pump, when actuated. (Switch must be
held ON for duration of auxiliary pump use.)
The auxiliary pump functions to provide sufficient oil flow
to operate the basic machine functions should the main
pump or engine fail. The auxiliary pump will operate
tower boom lift, tower telescope, main boom lift, main
telescope and swing.