29
Southworth Products
DDL Dock Lift Manual
7
Troubleshooting
PROBLEM
POSSIBLE CAUSE
CHECK
Lift will not raise
Load too heavy
Make sure the load does not exceed the rated
capacity.
Power unit not receiving
power
Verify that the power unit is receiving power.
Section 8 Electrical on page 31.
Hand controls may be
malfunctioning or may not be
receiving power
Verify that the controls are receiving power
and are functioning correctly.
Motor contactor may be
malfunctioning
Verify motor contactor is functioning.
Section 8 Electrical on page 31.
Motor may be turning in wrong
direction
Swap any two phases of the motor power leads.
Hydraulic Fluid low
With lift in fully lowered position the fluid level
should be approximately 3/4” from the top of the
tank.
Lift has reached it upper limit
Upper limit switch may need to be adjusted.
Motor voltage too low
Supply voltage must be ± 10% of the rated
voltage at the motor terminals.
Tank vent plugged
Make sure vent plug on hydraulic tank is
installed and not blocked.
Suction filter is clogged
Clean suction filter.
Vacuum leak in the suction
line
Check all fittings and hoses for damage or loose
connections.
Down valve may be energized Check for voltage to down valve solenoid,
should be no voltage present.
Missing coupling between
motor and pump (if applicable)
Check to make sure the coupling between the
pump and motor has been installed.
(Machines
manufactured before September 2012).
Pressure relief valve is
activated
If there is a loud squealing noise the pressure
relief valve may be activated.
Contact
Southworth Customer Service for further
assistance.
External Hydraulic leak
Inspect all hoses, connections, and cylinders for
leaks.
