Snorkel TB50 - Manual (Page 58)

Chapter 8 – Operation
54 TB42/TB50 – 0074923
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 raise, boom extend, and platform rotate/level
function speed.
5. To stop movement release the control to its neutral
position or release the foot switch.
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
the machine on grades that exceed the 25 percent.
For operation on grades up to 25 percent, it is recom-
mended that the main boom be near horizontal to pro-
vide adequate ground clearance.
A 25 percent grade is a 30″ (0.76 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.
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.
Figure 8.4 – Upper Controls
Front Top
Emergency
Stop Button
Start Switch