Chapter 4 - Safety Devices; Emergency Stop Controls; Emergency Power System; Emergency Lowering Knob - Snorkel TB42J Operato's Manual

This aerial work platform is manufactured with safety de-
vices, 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.
A
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury can result from such accidents. Do not alter,
disable, or override any safety device.
If any safety devices are defective, remove the aerial plat-
form from service until qualified maintenance personnel
can make repairs.

Emergency Stop Controls

There is an emergency stop control at the lower and up-
per controls.
At the lower controls, the emergency stop is a two-posi-
tion toggle switch with a red safety guard (refer to Figure
4.1). Push the guard down over the toggle switch to dis-
connect power to all control circuits. Lift the guard and
push the toggle switch up to restore power.
Emergency
Stop Switch
Figure 4.1 – Lower Controls
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).
Push the emergency stop button in to disconnect power
to the upper control circuits. Pull the button out to re-
store power.
TB42J – 0172310
Chapter 4 – Safety Devices

Emergency Power System

The emergency power system includes a back-up pump,
motor, and battery. 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.
Hold the emergency power switch (refer to Figure 4.1
and 4.2) down to activate the emergency power system.
The length of time the pump can be operated depends on
the capacity of the battery.
Emergency
Power Switch

Emergency Lowering Knob

The emergency lowering knob may be used to lower the
Ground
booms if the engine will not start and the emergency
Controls Switch
power system will not work. The knob is on the base end
of the main boom lift cylinder (refer to Figure 4.3) and can
be accessed through the hole to the left of the battery
disconnect switch on the right side of the turntable.
The knob may be turned to open the cylinder bleed down
valve for emergency lowering.
Emergency
Stop Button
Figure 4.2 – Upper Controls
Emergency
Lowering Knob
Figure 4.3 – Emergency Lowering Knob
Emergency
Power Switch
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