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Chapter 6 – Controls
The circuit breaker protects the electrical wiring and
components from electrical overload in case of a short
circuit or other fault.
Caution
A tripped circuit breaker indicates a malfunction in
the electrical system. Component damage may result
if the cause of the malfunction is not corrected. Do
not operate the aerial platform if the circuit breaker
trips repeatedly.
Push the button to reset the circuit breaker.
Upper Controls
The upper controls are located on the control panel at
the platform. Boom, platform, and drive functions can be
operated from the upper controls. The following controls
are located on the upper control panel.
• Start/emergency power switch
• Emergency stop button
• Drive joystick
• Drive range switch
• Boom joystick
• Boom extension joystick
• Jib articulation/platform rotate joystick
• Platform level switch
• Horn switch
• Engine speed switch
• Snorkel guard override switch
• Platform overload/tilt warning light
• AC generator switch (option)
• Hydraulic system warm-up switch (option)
Start Switch
The engine can be started from the platform using the
start switch on the top of the upper control panel (refer
to Figure 6.3).
This switch is similar to an automobile ignition switch.
An alarm sounds when the switch is placed in the on
position to warn others that the machine engine is being
started.
• Before starting the engine, check the amber engine
warning light. The amber light will be flashing if the
engine is cold and the engine heater is on. The amber
light may flash for 1 to 12 seconds, depending on the
engine and ambient air temperature.
• Do not start the engine until the amber light has
stopped flashing.
• If the engine turns over but does not start while the
amber light is flashing, place the start switch in the off
position and back to the on position. Do not start the
engine until the amber light stops flashing.
• Hold the switch downward to start until the engine
starts, then release it to on.
26
• If the engine dies, the switch must be released to off
before it can be turned back to start.
Note
On some machines it may be necessary to pause about
three seconds in the on position before going to start so
the starter can engage.
If the platform is to stay in a particular position for a long
time, turn the start switch to off to shut off the engine
and save fuel.
Emergency Stop Button
The emergency stop is a two-position, red push button
on the top of the upper control panel (refer to Figure 6.3).
• Push the button inward to disconnect power from all
control circuits at the upper controls.
• Pull the button outward to restore power.
Note
The lower controls override the upper controls. If the up-
per control emergency stop button is engaged the lower
controls can still be used to operate the aerial platform.
• Push the emergency stop button inward when the
upper controls are not in use to protect against unin-
tentional operation.
Drive Joystick
The drive joystick (refer to Figure 6.3) is used to control
forward and reverse motion of the aerial platform. It is
also used to steer the machine. The steering and drive
functions may be operated simultaneously.
Note
The distance the joystick is moved is proportional to the
speed of the function.
• Hold the joystick forward to move the aerial platform
forward and backward to move in reverse as indicat-
ed by the directional arrows on the chassis.
• Hold the joystick to the right to steer the aerial plat-
form to the right and to the left to steer to the left as
indicated by the directional arrows on the chassis.
The wheels will steer only when the drive joystick is
in the forward or reverse drive position, or when the
booms are stowed.
Note
The steering wheels are not self-centering. Set the steer-
ing wheels straight ahead after completing a turn.
Drive Range Switch
The drive range switch (refer to Figure 6.3) has two po-
sitions to select drive wheel operation when the booms
are in the stowed position; tip boom fully retracted and
main boom fully lowered.
460SJ – 1433685
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