Snorkel TB50 - Manual (Page 70)

Chapter 10 – Emergency Operation
66 TB42/TB50 – 0074923
3. Step down on the platform foot switch (refer to Figure
10.4).
Figure 10.4 – Platform
4. Hold the engine/emergency power switch in the
emergency power position.
5. Hold the appropriate function toggle switch in the
desired direction.
Emergency Lowering
The main boom can be lowered in an emergency us-
ing the emergency lowering knob at the base of the lift
cylinder. The emergency lowering knob allows the main
boom to be lowered only. Only use this method if the
engine will not start and the emergency power system
will not work.
Danger
Pinch points exist between boom components and
between the booms and turntable. Death or serious
injury will result if the booms or platform lowers onto
personnel. Make sure all personnel stand clear while
lowering the booms.
Use the following procedure to manually lower the main
boom.
1. Slowly turn the emergency lowering knob to open
the bleed down valve on the main boom lift cylinder
(refer to Figure 10.5). Control the rate of descent by
turning the knob.
Figure 10.5 – Emergency Lowering Knob
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury can result from such accidents. Fully close
the emergency lowering knob before operating the
aerial platform.
2. Turn the knob to close the cylinder bleed down
valve.
Figure 10.3 – Upper Controls
Front Top
Emergency
Stop Button
Start Switch
Engine/Emergency
Power Switch
Platform Foot
Switch
Emergency
Lowering Knob