Upper Controls; Driving; Drive Speeds; Drive/Lift Level Sensor Interlock - Snorkel TM12 Series Operator's Manual

Chapter 9 – Operation

Upper Controls

The upper controls may be used for driving the aerial
platform and positioning the platform while on the job.
Before operating from the upper controls, properly set
up the aerial platform as described under Preparing for
Operation. Use the following procedure to operate the
aerial platform from the upper controls.
1. From the lower controls, twist the emergency stop
button clockwise (refer to Figure 9.1).
2. Insert the key into the start switch and turn the switch
to the on position.
3. Enter the platform and secure the chain.
4. Twist the emergency stop button clockwise (refer to
Figure 9.2).
Emergency
Stop Button
Platform Select Button
Drive Select Button
Figure 9.2 – Upper Controls
5. The aerial platform may be driven and the platform
may be raised and lowered from the upper controls.

Driving

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 a fully
stowed machine 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 30" (0.76 m)
vertical rise in 10' (3.05 m) horizontal length.
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.
30
Interlock
Joystick
Steer Switch
Horn Button
Use the following procedure to operate the drive func-
tions.
1. Press the drive select button (refer to Figure 9.2).
2. Squeeze and hold the interlock switch against the
joystick.
• To move forward, slowly push the joystick forward.
• To move backward, slowly pull the joystick back-
ward.

Drive Speeds

The drive speed is proportional to the joystick position.
The farther the joystick is moved, the faster the travel
speed.
Drive speed ranges are interlocked through a limit switch
that senses scissors arm position. When the platform
is elevated below approximately seven feet, the aerial
platform may be driven within the full range of drive
speeds. Above 6' (1.8 m) of elevation, 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 can result from such accidents. Do not alter,
disable, or override any safety device.
Do not use the aerial platform if it drives faster than 0.54
mph (0.87 km/h), which is 23' 9" (7.24 m) in 30 seconds,
when elevated above 6' (1.8 m).

Drive/Lift Level Sensor Interlock

When the platform is elevated above 6' (1.8 m), lift and
drive functions are interlocked through a level sensor
system. If the chassis is tilted more than two degrees
side-to-side or front-to-rear, platform raise and drive
functions are disabled and an alarm sounds when those
controls are activated.
If the drive/lift level sensor interlock shuts off the platform
raise and drive functions, lower the platform and drive to
a level surface.

Steering

The steer control switch is located on the joystick (refer
to Figure 9.2). Use the following procedure to steer the
aerial platform using the upper controls.
1. Squeeze and hold the interlock switch against the
joystick.
• To turn to the left, tap lightly on the left side of the
steer switch.
• To turn to the right, tap lightly on the right side of
the steer switch.
TM12 – 8210027