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Chapter 10 – Emergency Operation
Emergency
Stop Button
Platform Overload/Tilt
Warning Light
Override Switch
Figure 10.3 – Upper Control Station
2. Step down on the platform foot switch (refer to Figure
10.4).
Figure 10.4 – Platform Foot Switch
3. Hold the engine/emergency power switch in the
emergency power position.
4. Hold the appropriate function toggle switch in the
desired direction.
Override Switch
The override switch at the upper controls may be used
to override the Snorkel Guard, platform overload system,
bumpguard system, or boom/drive cut-out, when either
is activated.
When the platform overload system is activated, the
override or the emergency power switch (refer to Figure
10.3) at the upper controls may be used to override the
system to operate main boom up/down/retract, jib boom
up/down, or turntable rotation and drive functions. The
switch is spring returned to the normal operation position.
When the Snorkel Guard system is activated, the override
switch (refer to Figure 10.3) at the upper controls may be
used to override the system to operate main boom up/down/
retract, jib boom up/down and turntable rotation functions.
62
Start/Emergency
Power Switch
Platform Foot
Switch
The lower controls are not affected by the Snorkel Guard
activation.
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury could result from such accidents. The override
switch must only be used when all controls are re-
leased and in the neutral position. If a zero or neutral
state cannot be achieved, depress the emergency
stop and obtain assistance at the lower controls.
1. When the machine is stopped due to activation of
the Snorkel Guard system or overload, immediately
depress the emergency stop, release the foot switch
and all controls. Perform an assessment of the situ-
ation which caused the system to activate.
2. If it is determined that all controls are released and
operation can proceed, return the emergency stop
to the on position, and activate the override switch.
3. Activate the foot switch.
4. Activate the necessary functions to move the platform
away from the obstacle that caused the Snorkel
Guard activation or if due to an overload fault, retract
the booms then lower in a safe condition.
5. Assess the machine for any damage. If damage
occurred, return to the stowed position, exit the unit
and perform a thorough inspection before returning
to service.
Emergency Lowering
The main boom can be lowered in an emergency using
the emergency lowering knob at the base of the lift cylin-
der. The emergency lowering knob allows the main boom
to be lowered only. Only use this method if the engine will
not start and the emergency power system will not work.
Danger
Pinch points exist between boom components and
between the booms and turntable. Death or serious
injury will result if the booms or platform lowers onto
personnel. Make sure all personnel stand clear while
lowering the booms.
Use the following procedure to manually lower the main
boom.
1. Reach upward through the access hole on the bot-
tom of the turntable and slowly turn the knob (refer
to Figure 10.5) counterclockwise to open the bleed
down valve. Control the rate of descent by turning
the knob.
460SJ – 1433685
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