Driving And Steering - Snorkel 460SJ Operator's Manual

Chapter 8 – Operation
Boom
Boom Load in
Platform Function Capacity Light/Result
Elevation
Extension
Retracted Fully lowered 600 lb
At 600/1000
Horizontal 600 lb
limit
At 600/1000
Horizontal 1,000 lb
limit
Fully Fully
1,000 lb
Extended Elevated
Fully
At 600/1000
1,000 lb
Extended
limit
Figure 8.4 – Dual Platform Capacity Logic

Driving and Steering

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 drive an elevated aerial platform on
soft, uneven, or sloping surfaces. Do not drive on
grades that exceed 50 percent.
For operation on grades up to 50 percent, it is recom-
mended that the main boom be near horizontal and the
jib be elevated just enough to provide adequate ground
clearance.
A 50 percent grade is a 60" (1.52 m) 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 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.
50
Extend 1,000 lb/Can extend
1,000 lb/Transition to 600 lb as
Extend
boom is extended
1,000 lb/Transition to 600 lb as
boom is extended to limit, then
Extend
extend and boom down become
inactive with tilt/overload light illu-
minated. Can retract and boom up.
Boom Down 1,000 lb/Can boom down
1,000 lb/Transition to 600 lb as
boom is extended to limit, then
Boom Down
extend and boom down become
inactive with tilt/overload light illu-
minated. Can retract and boom up.
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 operation.
• Use high range (rabbit) when traveling across firm,
flat, level surfaces. High range can only be activat-
ed 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.
5. Steering is controlled with the drive joystick. The
joystick controls the two front wheels to steer the
aerial platform.
• To steer to the right, move the joystick to the right as
indicated by the directional arrows on the chassis.
• To steer to the left, move the joystick to the left as
indicated by the directional arrows on the chassis.
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.
460SJ – 1433685