Operator`s manual

When the ladder leaves the ladder bed, a micro switch at the ladder bed closes energizing the solenoid of
the Override Valve. The valve closes, preventing the flow of compressed air to the Parking Brake Control
Valve. The Parking Brake cannot be released unless the ladder is returned to the ladder bed or the red
Parking Brake Override Button is pressed. When the Override Button is pressed, current to the solenoid
is cut and the Override Valve opens, releasing the Parking Brake. When the Override Button is released,
the solenoid is re-energized, causing the Parking Brake Override Valve to close and the Parking Brake to
re-set. When the ladder is returned to the ladder bed, the micro switch at the ladder bed opens and
current to the solenoid is cut, causing the override valve to open. The Parking Brake can now be released
using the yellow Parking Brake Control.
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