Drive Speeds - Snorkel AB60J Operator's Manual

Chapter 8 – Operation
A 20 percent grade is a 24" (61 cm) vertical rise in 10'
(3.05 m) horizontal length.
Avoid driving with the platform over the front end of the
chassis. In this position the machine is difficult to control
because:
drive and steer control movements and their resulting

machine movements are reversed.
when driving fast, sudden turns or stops produce more

severe reactions to platform occupants.
more turning space is required to prevent the platform

from colliding with obstacles several feet beyond the
path of the tires.
Warning
Death or serious injury can 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
driving conditions. Place the switch in the appropriate
position to achieve the desired drive wheel opera-
tion.
Use high range 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.
48
Use low range for driving on loading ramps or

other steep grades and when safety consider-
ations demand slow deliberate machine move-
ment. 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 posi-
tion.
• 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.
5. The drive joystick controls the two front wheels to
steer the aerial platform.
• Push the drive joystick to the right to steer to the
right, the direction of the yellow arrow.
• Push the drive joystick to the left to steer to the left,
the direction of the blue arrow.
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 switch the drive system to low
range before traveling over rough terrain or any sloped
surface.
Drive speed ranges are interlocked through a limit switch
that senses the main boom position.
When the boom is elevated, only the slowest drive

speed will work regardless of the drive range switch
position.
To avoid a sudden speed change from high to low el-

evated 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.
AB60J – 0181972