Driving And Steering; Drive Range Switch; Drive Speeds; Drive/Lift Level Sensor Interlock - Snorkel S3215E Operator's Manual

Operation

Driving and Steering

Danger
The aerial platform can tip over if it becomes unstable.
Death or serious injury will result from a tip-over ac-
cident. Do not drive an elevated aerial platform on
soft, uneven, or sloping surfaces. Do not drive on
grades that exceed 25 percent.
A fully stowed machine may be operated on grades up
to 25 percent. A grade of 25 percent is a 0.76 m (30")
vertical rise in 3.05 m (10') horizontal length.
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.
Use the following procedure to operate the drive and
steer functions.
1. Place the drive/lift selector switch (refer to Figure 3)
in the drive position.
2. Push the drive joystick forward to move the chassis
forward. Pull the joystick backward to move the chas-
sis backward. The drive speed is proportional to the
joystick position.
3. To stop drive motion, return the joystick to neutral.
Note
To make an emergency stop push the emergency stop
button inward to apply the parking brakes.
4. 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
y
the steer switch.
To steer to the left, hold down the left side of the
y
steer switch.
Note
Holding the steer switch down too long may result in a sharp
turn. This is especially true when driving and steering at
the same time. It may be easier to turn the wheels in small
increments using a series of quick taps on the steer switch.
5. Set the steer wheels straight ahead after completing
a turn. The steering wheels are not self-centering.

Drive Range Switch

The drive range switch has two positions to select drive
wheel operation:
• High (Rabbit) – for normal driving conditions.
14
• Low (Turtle) – for driving on grades up to 25 percent
that require low speed and high torque operation,
where high range is not sufficient to climb the grade.
In high the machine will travel up to 3.2 km/h (2 mph) when
the platform is raised less than 2.4 m (8') and up to 0.6 km/h
(0.4 mph) when the platform is raised above 2.4 m (8'). Place
the drive range switch in high for normal machine operation.
Caution
The extension deck is free to move when the extension
handle locks are disengaged. Personal injury may result
from accidentally extending or retracting the deck. Make
certain both extension handle locks are fully engaged
when the deck is extended in the working position and
when it is stowed. Do not attempt to extend or retract the
platform unless the aerial platform is on a level surface.
Place the drive range switch in low, with the platform fully
lowered and the extension deck securely pinned, before
driving up a ramp to load the machine for transport.
If driving the machine, come to a complete stop before
switching from Low to High drive range.

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 before traveling over rough terrain or
any sloped surface.
Drive speed ranges are interlocked through limit switches
that sense the platform position.
• When the platform is elevated below approximately
1.8 m (6') the aerial platform may be driven with the
full range of drive speeds.
• When the platform is elevated above 1.8 m (6') only
the slowest drive speed will work.
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 0.6
km/h (0.4 mph), which is 5.3 m (7' 7") in 30 seconds,
when elevated above 1.8 m (6').

Drive/Lift Level Sensor Interlock

When the platform is elevated above 1.8 m (6'), lift and
drive functions are interlocked through a level sensor. If the
chassis is tilted more than specified side-to-side or front-
to-rear (refer to "Specifications" on pages 22-27), platform
raise and drive functions are disabled and an intermittent
alarm sounds when those controls are activated.
S3215E/S3219E/S3220E/S3226E/S4726E/S4732E – 1500842