Drive Speeds; Pivoting Front Axle - Snorkel A46JRT Operator's Manual

Chapter 8 – Operation
Warning
Death or serious injury could result from improperly
driving or steering the aerial platform. Read and un-
derstand the information in this manual and on the
placards and decals on the machine before operating
the aerial platform on the job.
The blue and yellow arrows on the chassis indicate the
direction the chassis will move when the drive or steer
control is moved toward the corresponding color.
When the machine is in the stowed position, with the
booms centered between the rear wheels, the direction
of drive and steer control movement corresponds with the
direction of chassis movement.
When the turntable is rotated from the stowed position,
with the booms to either side of or in front of the chassis,
the direction of control movement does not correspond
with the direction of chassis movement.
• To avoid confusion, always drive to the work area
or move between work areas with the turntable and
booms in the stowed position.
• After arriving at the work area, the booms may be
positioned to the side or the front of the chassis for
final positioning.
• Always look in the direction of movement as indicated
by the directional arrows on the chassis.
Use the following procedure to operate the drive and
steer functions.
1. Determine the desired drive range for the specific driv-
ing conditions. Place the switch in the appropriate posi-
tion to achieve the desired drive wheel operation.
• Use high range (rabbit) when traveling across firm,
flat, level surfaces. High range can only be activated
when the booms are stowed. High range is for high
speed, low torque operation.
• Use low range (turtle) for driving on loading ramps or
other steep grades and when safety considerations
demand slow deliberate machine movement. Low
range is for low speed, high torque operation.
2. Step down on the platform foot switch.
3. The drive speed is proportional to the joystick position.
• Push the drive joystick forward to move the chassis
forward, the direction of the blue arrow.
• Pull the joystick backward to move the chassis
backward, the direction of the yellow arrow.
4. To stop drive motion, return the joystick to neutral.
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5. The steer switch is a momentary contact, rocker
switch on top of the drive joystick. This switch controls
the two front wheels to steer the aerial platform.
• To steer to the right, hold down the right side of the
steer switch.
• To steer to the left, hold down the left side of the
steer switch.
Note
The steering wheels are not self-centering. Set the steer-
ing wheels straight ahead after completing a turn.
6. After driving to the desired location, release the foot
switch, or push the emergency stop button to apply
the parking brakes.

Drive Speeds

The drive speed is proportional to the joystick position.
The farther the joystick is moved, the faster the travel
speed.
Always slow down and shift the drive system to low range
before traveling over rough terrain or any sloped surface.
Drive speed ranges are interlocked through limit switches
that sense the main and riser boom position.
• When either boom is elevated or extended, only the
slowest drive speed will work regardless of the drive
range switch position.
• To avoid a sudden speed change from high to low
elevated boom speed, always bring the machine to
a stop before raising the booms from the stowed
position.
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.
Do not use the aerial platform if it drives faster than 0.8
miles per hour (35 feet in 30 seconds) when any of the
booms are out of the stowed position.

Pivoting Front Axle

When the machine is in the stowed position, with the
booms lowered and retracted, the front axle pivots to
keep all four wheels in contact with the ground surface.
While driving between work site, the pivoting axle:
• Improves traction
• Reduces ground pressure
When the main or riser boom is raised from its rest, the
axle locks into position to maximize the stability of the
machine while the platform is elevated.
A46JRT – 0260996