Troubleshooting - Presto Lifts ECOA PDL60-50 Owner's Manual

7. Troubleshooting

PROBLEM
Lift will not raise
Lift fails to hold
(Drifts down)
Presto Lifts
POSSIBLE CAUSE
Load too heavy
Power unit not receiving
power.
Hand controls may be
malfunctioning or may not be
receiving power.
Motor contactor may be
malfunctioning.
Motor may be turning in wrong
direction.
Hydraulic Fluid low
Lift has reached it upper limit.
Motor voltage too low
Tank breather plugged
Suction filter is clogged
Vacuum leak in the suction
line
Down valve may be energized Check for correct voltage to down valve and
Missing coupling between
motor and pump (if
applicable).
Pressure relief valve is
activated.
External Hydraulic leak
Down valve may be leaking
internally.
Down valve may be energized Check the solenoid with a volt meter.
Cylinder may be leaking
Make sure the load does not exceed the rated
capacity.
Verify that the power unit is receiving power. See
Section 8. Electrical.
Verify that the controls are receiving power
and are functioning correctly. See Section
8. Electrical.
Verify motor contactor is functioning. See
Section 8. Electrical.
Swap any two phases of the motor power leads.
With lift in fully lowered position the fluid level
should be approximately 3/4" from the top of the
tank.
Upper limit switch may need to be adjusted
Supply voltage must be ± 10% of the rated
voltage at the motor terminals.
Make sure breather plug on hydraulic tank is
installed and not blocked.
Clean suction filter.
Check all fittings and hoses for damage or loose
connections.
solenoid valve.
Check to make sure the coupling between the
pump and motor has been installed.(Machines
manufactured before September 2012).
If there is a loud squealing noise the pressure
relief valve may be activated. – Contact
Customer Service for assistance.
Inspect all hoses, connections, and cylinders for
leaks.
Remove the down valve and inspect for debris
which may be preventing it from closing.
Contact Customer Service for procedure.
Check for fluid leaks.
24
CHECK
PDL Manual