25
Presto Lifts
PDL Manual
PROBLEM
POSSIBLE CAUSE
CHECK
Lift will not lower
Down valve may not be
energized
Check for power to the solenoid valve with a volt
meter while pressing the down button.
Down Flow control may need
to be adjusted
Adjust down flow control as needed.
Lift raises too
slowly
Voltage may be low
Check voltage at motor. Supply voltage must
be ± 10% of the rated voltage at the motor
terminals.
Suction filter, breather cap, or
pressure line may be clogged
Remove necessary components and clean.
Pump may be overheating
due to insufficient oil
Check fluid level and viscosity.
Pressure relief valve is
activated.
If there is a loud squealing noise the pressure
relief valve may be activated. – Contact the
manufacturer for assistance.
Lift lowers too
slowly
Down valve may not be fully
opening or may be partially
blocked or stuck closed.
Remove the down valve and clean. -
Contact
Customer Service for procedure.
Down Flow control may need
to be adjusted
Adjust the down flow control as necessary.
Lift lowers too
quickly
Down flow control may need
adjustment.
Adjust down flow control for desired lowering
speed.