Chapter 8 – Operation
A46JRT – 0260996 47
Stow the booms before driving the machine to reposition
it when operating on uneven surfaces. With the booms
stowed, the front axle pivots to keep all four wheels in
contact with the ground surface.
Drive Motion Alarm
The drive motion alarm sounds loud intermittent beeps
anytime the machine is being driven.
Platform Overload Sensing System
When the platform is at full capacity, the platform overload
light at the lower and upper controls (refer to Figures 8.1
and 8.2) will be solid on.
When the platform overload limit is exceeded, all func-
tions are stopped from the upper and lower controls. The
horn will sound intermittently and the platform overload
lights will blink until the excess load is removed from the
platform. At that time, the machine functions are again
operational.
If the platform becomes significantly overloaded, or if an
upward force on the platform exceeds approximately 500
lb (2225 N), the system will enter into error mode, stopping
all functions from the upper and lower controls. The horn
will then sound constantly and the overload light will stay
illuminated at the upper and lower controls.
The system will remain in error mode until the excess
load is removed from the platform and the emergency
stop button or start switch is cycled off and back on,
resetting the system. At that time, the machine functions
are operational.
Caution
The emergency power system is for emergency
lowering and stowing only. The length of time the
pump can be operated depends on the capacity of the
battery. Do not use this system for normal operation.
If the platform overload sensing system is tripped while
operating the machine or if the system is in error mode
and can not be reset, the emergency power system may
still be used for emergency machine operation from either
the lower or upper controls.
Danger
The aerial platform can tip over if it becomes unsta-
ble. Death or serious injury will result from a tip-over
accident. Do not exceed the capacity values indicated
on the platform rating placard.
The overload sensing system is not active when the ma-
chine is being driven with the booms in the stowed position.
This allows the machine to be driven without the system
sensing an overload due to rough ground conditions.
To eliminate repeated tripping of the system during ma-
chine operation, there is a five second delay in machine
functions following:
• starting the engine.
• removing excess load from the platform.
Snorkel Guard
The Snorkel Guard (refer to Figure 8.2.) is a mechanically
activated guarding system which offers an additional level
of protection to the operator at the upper controls.
If an operator is involuntarily pushed against the
spring-loaded Snorkel Guard rail that is mounted above the
upper control panel, the machine functions are disabled.
When the Snorkel Guard is activated:
• the horn sounds.
• the blue light under the upper control panel ashes.
• only main boom down and jib down functions will
operate.
The lower controls are not affected by the Snorkel Guard
activation.
Override Switch
The override switch at the upper controls may be used
to override the platform overload and the Snorkel Guard
system, when either one is activated.
When the platform overload system is activated, the
override or the emergency power switch (refer to Figure
8.2) at the upper controls may be used to override the
system to operate riser up/down, 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 8.2) at the upper controls may be
used to override the system to operate riser up/down, main
boom up/down/retract, jib boom up/down, or turntable
rotation functions.
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.
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