PST3/PSTF3 750
Maintenance
wc_tx000988gb.fm
27
3.7
Troubleshooting
Before ordering repairs, carefully read through this manual, then
repeat the inspection. If the problem remains, contact your nearest
dealer or Wacker Neuson representative.
ALWAYS turn off the power before inspecting the pump. Failure to
observe this precaution can result in serious accident.
Problem / Symptom
Reason / Remedy
Pump will not start
• Power is off. Restore power.
• Cable assembly is cut or not connected properly. Repair/
replace the cable or fix the connection.
• Impeller is clogged. Inspect the pump and remove any
debris.
Pump stops soon after start-
ing (Motor protector operates)
• Impeller is clogged. Remove debris.
• Low voltage. Provide the rated voltage, or make sure the
cable assembly extension is the proper standard.
• Wrong power frequency. Check the nameplate, and
replace the pump or the impeller.
• Extended operation with a clogged strainer. Remove
debris from the strainer.
• Float (if equipped) is obstructed, not moving freely, or mal-
functioning. Remove obstructions. Repair or replace float
switch if necessary.
Pump does not stop automat-
ically
• Float (if equipped) is obstructed, not moving freely, or mal-
functioning. Remove obstructions. Repair or replace float
switch if necessary.
• Water level of float (if equipped) set lower than pump’s min-
imum operating water level. Set float higher than pump’s
minimum operating water level.
Poor lift or discharge
capacity
• Faulty motor. Repair or replace the motor.
• Excessive sand is discharged. Place the pump on a block
or other base to prevent the sand from being sucked into it.
• Worn out impeller. Replace.
• Sharply bent or clogged hose. Straighten out any sharp
bends. Enclose the pump with a screen to keep away
debris.
• Strainer clogged or buried. Remove debris from the
strainer, or place a block under the pump.
Heavy vibration or noise
• Damaged motor shaft or bearings. Contact dealer and
replace motor or bearings.
WARNING
