Southworth LS Serie El Manual Del Propietario página 17

TROUBLESHOOTING
PROBLEM
Weight of load too heavy
Motor not running
Motor runing but not moving (three phase) Swap any two phases
Hydraulic oil level low
Lift has reached its upper limit
Motor may be "single phasing"
Lift will not
raise
Motor voltage too low
Tank vent plugged
Suction filter clogged
Vacuum leak in suction line
Down valve may be energized
Missing coupling
Down valve may be leaking
The lift fails to
Down valve may be energized
hold
Cylinder may be leaking
Down valve may be de-energized
Lift will not
lower
Flow control needs adjustment
Voltage may be low
Lift raises too
Foreign material clogging suction filter,
breather cap or pressure line
slowly
Pump may be overheating due to insuf-
ficient oil
Down valve may not be fully open or stuck
Lift lowers too
closed
slowly
Flow control may need adjustment
If the steps listed above do not solve the problem, please call the Southworth's Customer Service Department.
POSSIBLE CAUSE CHECK THIS
Check the actual weight of the load
Check the main disconnect switch, fuses, and wiring to
the motor. A 20 amp, designated braker must be sup-
plied for 115 single phase.
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.
Upper limit switch may need to be adjusted
If motor hums but does not turn, check motor wiring and
line fuses.
Supply voltage should be +/- 5% of the rating aor single
phase and 10% for 3 phase units.
If supplied, remove solid plug from tank, insert vent plug.
Clean suction filter as described in periodic maintenance
Check all fittings in suction line
Check wiring to down valve, and solenoid in the valve
Check to insure the coupling has been installed between
the pump and motor as required by pump, see figure 15.
Remove down valve and inspect for debris which may be
preventing it from closing.
Check the solenoid in the valve with a volt meter.
Check for oil in cylinder in the vent line.
Check the solenoid in the valve with a volt meter
Adjust flow control as needed
Check voltage at motor to ensure proper voltage is being
supplied
Remove necessary components and clean
Check oil level and oil viscosity
Remove down valve and clean
Adjust flow control as needed
Southworth Owner's Manual -- LS Series
17