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This aerial work platform is manufactured with safety
devices, placards, and decals to reduce the likelihood
of an accident.
• For the safety of all personnel, do not disable, modify,
or ignore any safety device.
• Safety devices are included in the daily prestart
inspection.
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury could result from such accidents. Do not alter,
disable, or override any safety device.
If any safety devices are defective, remove the aerial
platform from service until qualified maintenance person-
nel can make repairs.
Emergency Stop Controls
There is an emergency stop control at the lower and
upper controls.
At the lower controls, the emergency stop is a two-posi-
tion push button (refer to Figure 4.1).
Platform Overload/Tilt
Warning Light
Start/Emergency Power/
Ground Operation Switch
Figure 4.1 – Lower Controls
• Push the emergency stop button inward to disconnect
power to all control circuits.
• Pull the button outward to restore power.
460SJ – 1433685
Chapter 4 – Safety Devices
Emergency
Stop Button
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.
At the upper controls, the emergency stop is a two-posi-
tion push button (refer to Figure 4.2).
Emergency
Stop Button
Platform Overload/Tilt
Warning Light
Override Switch
Figure 4.2 – Upper Controls
• Push the emergency stop button inward to disconnect
power to the upper control circuits.
• Pull the button outward to restore power.
Emergency Power System
The emergency power system includes a back-up pump,
motor, and batteries. Use this system to operate the boom
and turntable functions to lower the platform if the main
power system fails due to engine or pump failure.
Caution
The emergency power system is for emergency low-
ering and stowing only. The length of time the pump
can be operated depends on the capacity of the bat-
teries. Do not use this system for normal operation.
• Hold the emergency power switch (refer to Figures
4.1 and 4.2) in the proper position to activate the
emergency power system.
• Release the switch to disengage the emergency
power system.
• The length of time the pump can be operated de-
pends on the capacity of the batteries.
Emergency Lowering Knob
The emergency lowering knob may be used to lower
the booms if the engine will not start and the emergency
power system will not work. The knob is on the base end
of the main boom lift cylinder and may be accessed from
beneath the turntable (refer to Figure 4.3) or behind the
engine on the right side of the turntable.
Start/Emergency
Power Switch
17
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