Snorkel AB60J - Manual (Page 38)

Chapter 7 – Prestart Inspection
34 AB60J – 0181972
4. Slowly turn the emergency lowering knob to open
the bleed down valve on the riser boom lift cylinder
(refer to Figure 7.11). The riser boom should slowly
lower.
Figure 7.11 – Riser Boom Emergency
Lowering Knob
5. Turn the knob to close the cylinder bleed down
valve.
6. Slowly turn the emergency lowering knob to open
the bleed down valve on the main boom lift cylinder
(refer to Figure 7.12). The main boom should slowly
lower.
Figure 7.12 – Main Boom Emergency
Lowering Knob
7. Turn the knob to close the cylinder bleed down
valve.
Warning
The potential for an accident increases when safety
devices do not function properly. Death or serious
injury could result from such accidents. Fully close
the emergency lowering valves before operating the
aerial platform.
Warning
The potential for an accident increases when operat-
ing an aerial platform that is damaged or malfunction-
ing. Death or serious injury could result from such
accidents. Do not operate the aerial platform if it is
damaged or malfunctioning.
6. Test the operation of each function in both direc-
tions.
Note
When checking the turntable rotation function in the clock-
wise direction, the turntable will rotate toward you.
Emergency Stop
To test the emergency stop button from the lower con-
trols:
1. Push the emergency stop button (refer to Figure 7.10)
inward to turn off electrical power.
2. Test the lower control functions to make sure they do
not operate.
Emergency Power
To test the emergency power system from the lower
controls:
1. Place the battery disconnect switch, the emergency
stop switch and the start switch in the on position.
2. Hold the engine/emergency power switch (refer to
Figure 7.10) downward and the ground operation
switch upward to operate the aerial platform from the
lower controls using the emergency power system.
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 end of
the lift cylinders.
Use the following procedure to test the emergency lower-
ing system:
1. Use the lower controls to raise the main and riser
booms.
2. Turn the engine off.
Danger
Pinch points may exist between moving components.
Death or serious injury will result from becoming
trapped between components. Make sure all person-
nel stand clear while lowering the platform with the
emergency lowering knob.
3. Make sure there is nothing in the way to obstruct the
platform when it lowers.
Emergency
Lowering Knob
Emergency
Lowering Knob