Boom Operation; Driving And Steering - Snorkel TB66JRT Operator's Manual

Chapter 8 – Operation
Emergency
Stop Button
7. Turn the start switch to on and pause a few sec-
onds while the alarm sounds to alert others that the
machine is about to start. Turn the switch to start,
then release it to on. The engine will not start if the
switch is left in the on position for 30 seconds or
longer before turning it to start. The switch must be
turned back to off before the engine will start.
Note
If the machine has a GM engine, there will be a 7 to 10
second delay after starting the engine, before the throttle
will go to mid or high. Start the engine and wait 10 sec-
onds before proceeding with machine operation.
8. Let the engine warm to operating temperature.

Boom Operation

Use the following procedure to operate the turntable,
boom, or platform functions.
1. Turn the boom speed knob to slow.
2. Step down on the platform foot switch. This switch
must be held down to operate the upper controls.
3. Hold the appropriate control in the desired direction.
Always look in the direction of movement.
4. Gradually turn the boom speed knob to control
the boom extend, jib and platform level function
speed.
5. To stop movement release the control to its neutral
position or release the foot switch.
52
Top
Figure 8.4 – Upper Controls
Start Switch
Front

Driving and Steering

Danger
The aerial platform can tip over if it becomes un-
stable. 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 the machine on grades that exceed the
grade capability of the machine.
For operation of two wheel drive machines on grades up
to 25 percent, or four wheel drive machines on grades
up to 30 percent, it is recommended that the main boom
be near horizontal and the jib elevated just enough to
provide adequate ground clearance.
A 25 percent grade is a 30" (0.76 m) vertical rise in 10'
(3.05 m) horizontal length.
A 30 percent grade is a 36" (0.91 m) vertical rise in 10"
(3.05 m) horizontal length.
Avoid driving with the platform over the front (steer) end
of the chassis. In this position the machine is difficult to
control because:
• drive and steer control movements and their result-
ing 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
understand the information in this manual and on
the placards and decals on the machine before op-
erating the aerial platform on the job.
TB66J – 0083740