Snorkel AB60J - Manual (Page 62)

Chapter 10 – Emergency Operation
58 AB60J – 0181972
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.
Riser Boom
Use the following procedure to manually lower the riser
boom.
1. Slowly turn the emergency lowering knob (refer to
Figure 10.5) to open the bleed down valve. Control
the rate of descent by turning the knob.
Figure 10.5 – Riser Boom 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.
Main Boom
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 10.6). Control the rate of descent by
turning the knob.
Figure 10.3 – Upper Controls
2. Turn the start switch on.
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 riser and main booms can be lowered in an emer-
gency using their respective emergency lowering knobs.
The emergency lowering knobs are at the base of the
lift cylinders. The emergency lowering knobs allow the
booms to be lowered only. Only use this method if the
engine will not start and the emergency power system
will not work.
Platform
Foot Switch
Emergency
Stop Button
Start Switch
Engine/Emergency
Power Switch
Emergency
Lowering Knob