Owner's Manual Presto DXS Series - ECOA CDL & CLT Series
Page 13
PROBLEM
POSSIBLE CAUSE
CHECK THIS
Lift will not
raise
Weight of load too heavy
Check the actual weight of the load
Motor not running
Check the main disconnect switch, fuses, and wiring to
the motor. A 20 amp, designated braker must be sup-
plied for 115 single phase.
Motor running but not moving (three
phase)
Swap any two phases
Hydraulic oil level low
When lift is raised as far as possible, oil level should be
3/4” from bottom of tank. When lift is down, 3/4” from top.
Ensure chocks on lift before working under it.
Lift has reached its upper limit
Upper limit switch may need to be adjusted
Motor may be “single phasing”
If motor hums but does not turn, check motor wiring and
line fuses.
Motor voltage too low
Supply voltage should be +/- 5% of the rating a or single
phase and 10% for 3 phase units.
Tank vent plugged
If supplied, remove solid plug from tank, insert vent plug.
Suction strainer clogged
Clean suction filter as described in periodic maintenance
Vacuum leak in suction line
Check all fittings in suction line
Down valve may be energized
Check wiring to down valve, and solenoid in the valve
Missing coupling
Check to insure the coupling has been installed between
the pump and motor as required by pump, see figure 15.
The lift fails to
hold
Down valve may be leaking
Remove down valve and inspect for debris which may be
preventing it from closing.
Down valve may be energized
Check the solenoid in the valve with a volt meter.
Cylinder may be leaking
Check for oil in cylinder in the vent line.
Lift will not
lower
Down valve may be de-energized
Check the solenoid in the valve with a volt meter
Flow control needs adjustment
Adjust flow control as needed
Lift raises too
slowly
Voltage may be low
Check voltage at motor to ensure proper voltage is being
supplied
Foreign material clogging suction filter,
breather cap or pressure line
Remove necessary components and clean
Pump may be overheating due to insuf-
ficient oil
Check oil level and oil viscosity
Lift lowers too
slowly
Down valve may not be fully open or stuck
closed
Remove down valve and clean
Flow control may need adjustment
Adjust flow control as needed
If the steps listed above do not solve the problem, please call the Presto-ECOA Customer Service Department.
TROUBLESHOOTING