JLG 800A_AJ Operator Manual - Manual (Page 54)

SECTION 3 - MACHINE CONTROLS AND INDICATORS
3-14 – JLG Lift – 3121209
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.
15. Tower Lift
The three position center-off toggle switch provides for
raising and lowering of the tower boom when positioned
to “UP” or “DOWN”. TOWER LIFT must be fully elevated
“UP” before operating TOWER TELESCOPE. (TOWER
LIFT should not function when TOWER TELESCOPE is
extended).