Driving And Steering; Drive Range Switch; Drive Speeds; Drive/Lift Pothole Protector Interlock - Snorkel S2255RT Operator's Manual

Chapter 8 – Operation

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 35 percent.
A fully stowed machine may be operated on grades up
to 35 percent.
Warning
Death or serious injury could result from improp-
erly driving or steering the aerial platform. Read
and understand 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
8.2) in the drive position.
2. Squeeze and hold the interlock switch against the
joystick.
3. Push the drive joystick forward to move the chassis
forward. Pull the joystick backward to move the
chassis backward. The drive speed is proportional
to the joystick position.
4. 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.
5. The steer switch is a momentary contact, rocker
switch on top of the drive joystick. This switch con-
trols the two front wheels to steer the aerial platform.
Ÿ
To steer to the right, hold down the right side of
the steer switch.
Ÿ To steer to the left, hold down the left side of
the 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.
6. 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:
Ÿ High (Rabbit) – for normal driving conditions.
42
Ÿ
Low (Turtle) – for driving on grades up to 35 percent
that require low speed and high torque operation,
where high range is not suffi cient to climb the grade.
In high the machine will travel up to 3.3 mph (5.2 km/h)
when the platform is raised less than 8' (2.4 m) and
up to 0.4 mph (0.64 km/h) when the platform is raised
above 8' (2.4 m). Place the drive range switch in high
for normal machine operation.
Caution
The extension deck is free to move when the exten-
sion 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 at-
tempt 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 locked in the stowed
position, 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 switch-
es that sense the platform position.
Ÿ When the platform is elevated below approximately
6' (1.8 m) the aerial platform may be driven with the
full range of drive speeds.
Ÿ When the platform is elevated above 6' (1.8 m) 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 0.4
mph (0.64 km/h), which is 7' 7" (5.3 m) in 30 seconds,
when elevated above 6' (1.8 m).

Drive/Lift Pothole Protector Interlock

The aerial platform drive and lift functions are interlocked
through a limit switch that senses whether or not the
pothole protection linkage is locked into position. The
drive/lift pothole interlock operates when the platform
is elevated approximately 6' (1.8 m).
S2255RT S2755RT - 15286-1