MANUAL BOOM OPERATION
Manual retraction, rotation and lowering functions allow the Model 3522A Articulating Boom Lift to be moved and lowered during hydraulic power interruption or failure. In each instance, refer to Figure
The following procedures for manual retraction, rotation and lowering require a person on the ground to operate the manual controls and hand pump.
The hydraulic hand pump is located in the pump compartment. In case of a power failure, the hand pump and selected hydraulic valve settings can be used to manually retract the articulating boom or rotate the boom turntable.
To begin manual retraction or rotation, turn Proportional Valve counterclockwise until it stops, and insert pump handle into the pump handle fitting.
ROTATION
BUTTON PUMP HANDLE
FITTING
HAND PUMP
RETRACT
BUTTON
Manual Retraction
Pushing and holding the Retract button while simultaneously actuating Hand Pump will retract the extension boom section.
Manual Rotation
To rotate the turntable clockwise: Push and hold the Rotation button and simultaneously actuate Hand Pump.
To rotate the turntable counterclockwise: Pull the Rotation button out and simultaneously actuate Hand Pump.
NOTE: Return proportional valve to its original position before lowering the lift or resuming normal operation.
ROTATION
BUTTON
PUMP HANDLE
FITTING
RETRACT
BUTTON
Figure 3-5. Hand Pump and Controls for Manual Lift Operation
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