30
Southworth Products
DDL Dock Lift Manual
PROBLEM
POSSIBLE CAUSE
CHECK
Lift fails to hold
(Drifts down)
Down valve may be leaking
internally
Remove the down valve and inspect for debris
which may be preventing it from closing.
C
ontact Southworth Customer Service for
procedure.
Down valve may be energized Check the solenoid with a voltmeter.
Cylinder(s) may be leaking
Check for fluid leaks. (i.e. excess fluid in the
vent lines or fluid on the ground.)
Lift will not lower
Down valve may not be
energized
Check for power to the down valve solenoid with
a voltmeter 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.
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. Verify
proper voltage present.
Contact Southworth
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.
