Snorkel TB42, Operator'S Manual

Page: 47 / 68

Chapter 8 – Operation
TB42/TB50 – 0075251EE 43
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.
Figure 8.4 – Platform
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
main boom extend, platform rotate, and platform level
function speed.
5. Releasing the control to its neutral position, or re-
leasing the foot switch will stop movement.
Lanyard
Anchors
Platform Foot Switch
Figure 8.3 – Upper Controls
Top Front
Driving and Steering
A
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 plat-
form on soft, uneven, or sloping surfaces. Do not
drive the machine on grades that exceed 25 per-
cent.
For operation on grades up to 25 percent, it is recom-
mended that the main boom be lowered with the platform
elevated just enough to provide adequate ground clear-
ance. A 25 percent grade is a 0.76 m (30
″
) vertical rise in
3.05 m (10
′
) 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 plat-
form from colliding with obstacles several feet be-
yond the path of the tires.
A
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.
Start Switch
Emergency Stop
Platform
Overload Light