TM 5-3810-307-10
PANEL Light DIMmer Control (53). The control is located below the DRIVE/PANEL Light
Switch (52) on the right side of the front console panel. PANEL Light DIMmer Control knob
controls the brightness of the panel lights.
OUTRIGGERS EXTEND/RETRACT Switch (54). The switch is located on the lower right
panel of the front console. It is a two-position, spring-centered-to-off toggle switch. This
switch is used in conjunction with the OUTRIGGER SELECTOR Switches (40) to extend
and retract the outrigger extensions and stabilizers. The OUTRIGGER EXTEND/RETRACT
Switch energizes a solenoid, which allows hydraulic fluid to flow through the control valve
and selected solenoid valve(s) to move the selected component in the desired direction.
FRONT AXLE STEERING Control (55). The control is a three-position (LEFT/center/
RIGHT), spring-centered-to-off, toggle switch located on the right side of the front console.
With boom over rear of crane, this function provides conventional "rear wheel" steering of
the front axle and can only be used safely when moving slowly. Positioning the switch to
RIGHT with rear wheels straight ahead turns the front wheels to steer the crane right.
Positioning the switch to LEFT with rear wheels straight ahead turns the front wheels to
steer the crane left. The switch will return to the center (OFF) position when released.
Indicators above the switch light to indicate which direction the crane will turn and when
wheels are centered.
IGNITION Switch (56). The switch is located on the lower right side of the front console
panel next to the steering column. It is non-keyed switch with four positions; 3 (ACC), 0
(OFF), 1 (RUN), and 2 (START). The switch is spring-returned from START to RUN. The
OFF position deenergizes the superstructure electrical system except for the beacon lights,
heater, and oil cooler fan.
The ACC position energizes all electrical components except the engine fuel solenoid valve.
The RUN position energizes the same components except that the engine fuel solenoid
valve is also energized. Placing the switch in the START position energizes the starter
relay which in turn energizes the cranking motor solenoid and cranks the engine for starting.
Releasing the switch will allow it to spring-return to the RUN position. Placing the switch to
OFF shuts down the diesel engine.
PARK BRAKE Control (57). The control is the yellow handle located on the right side of
the front console panel. The control is a push-pull-type air valve used to set and release the
parking brakes on the front and rear axles. Pull to apply parking brake, push to release
parking brake.
AIR CONDITIONER Control (58). The control is located on the right side of the front
console panel. It is a four-position control (HI/MED/LO/OFF).
START/OFF Switch (Heater) (59). The switch is located on the diesel heater control panel
to the right of the operator's seat. Placing the switch in the START position turns on the
heater fuel pump, ignites fuel in the heat exchanger, and turns on the heater fan after a
short delay. The OFF position shuts down the heater. After shutdown, the heater fan will
continue to run until the heat exchanger has cooled down.
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