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4. Hold the ground operation switch upward.
Danger
Pinch points may exist between moving components.
Death or serious injury will result from becoming
trapped between components, buildings, structures,
or other obstacles. Make sure all personnel stand
clear of the aerial platform while performing the pre-
start inspection.
Warning
The potential for an accident increases when operat-
ing an aerial platform that is damaged or malfunction-
ing. Death or serious injury could result from such
accidents. Do not operate the aerial platform if it is
damaged or malfunctioning.
5. Test the operation of each function in both directions.
Note
When checking the turntable rotation function in the coun-
terclockwise direction, the turntable will rotate toward you.
Emergency Stop
To test the emergency stop button from the lower
controls:
1. Push the emergency stop button inward to turn off
electrical power.
2. Test the lower control functions to make sure they do
not operate.
Emergency Power
To test the emergency power system from the lower
controls:
1. Place the battery disconnect switch and the emer-
gency stop button in the on position.
2. Hold the emergency power switch upward to operate
the aerial platform from the lower controls using the
emergency power system.
Diagnostic Center Display
To test the diagnostic center display on the lower
control panel (refer to Figure 7.7), from the lower
controls:
1. Turn the battery disconnect switch on.
2. Pull the emergency stop button outward to the on
position.
3. The display on the LCD screen should indicate:
y The accumulated aerial platform operating time.
460SJ – 1433685
Chapter 7 – Prestart Inspection
y "Mode Neutral" when no functions are being
operated. When the machine is operated, the
display will indicate the name of that function.
Emergency Lowering
The main boom can be lowered in an emergency using
the emergency lowering knob. The emergency lowering
knob is at the base of the main boom lift cylinder.
Use the following procedure to test the emergency low-
ering system.
1. Use the lower controls to raise the main boom.
2. Turn the engine off.
Danger
Pinch points may exist between moving components.
Death or serious injury will result from becoming
trapped between components. Stand clear of moving
components while test operating the machine.
3. Reach upward through the access hole on the bottom
of the turntable (refer to Figure 7.8) and slowly turn
the knob counterclockwise to open the bleed down
valve. The boom should slowly lower by gravity.
Emergency Lowering
Figure 7.8 – Emergency Lowering Knob
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury could result from such accidents. Fully close
the emergency lowering knob before operating the
aerial platform.
4. Turn the knob clockwise to close the cylinder bleed
down valve.
Flashing Lights
The machine may be equipped with two optional flashing
lights mounted to the top of the counterweight.
Knob
35
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