Possible problems and steps to take.

  1. Normal conditions – The pump may simply be grinding matter. Pull the core and clean the basin, if the pump noise doe not drop to a normal level.
  2. Low Voltage reading – Check the pump name plate for proper voltage level and compare to the existing voltage.
  3. Discharge is plugged – If amperage is 8 or above, shut off the pump and inspect for a plugged line. Be sure to determine whether or not the pump has been damaged by disconnecting the discharge piping and recycling the tank fluid. Turn the pump power back on and check amp level. If the level is still elevated, install another pump and take the faulty pump in and check for motor issues.
  4. Stator damage – Inspect stator for tears and or holes. Replace as may be needed.
  5. Motor Bearing Wear – Pull the pump stator and by hand rotate the shaft. If shaft rotation is difficult, replace the pump. Replace the motor bearings of the failed pump.