Pentair Motor Bearing Failure

Pump is very noisy with a loud grinding or screeching sound from the motor area.

Advertisements

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Advertisements

Possible Causes

Worn motor bearings from age, Water intrusion past mechanical seal into motor, Corrosion from chemical exposure, Misalignment or overtightened drive end

How to Fix / Troubleshooting

Safety first: Turn off power and do not run the pump with severe bearing noise; it can seize and trip breakers.

  • Step 1 – Confirm noise source: Use a mechanic’s stethoscope or a long screwdriver to listen at the motor housing versus the wet end. Bearing noise is typically a high‑pitched whine or grinding from the motor body.
  • Step 2 – Inspect for leaks: Look under the pump for water dripping between the motor and pump housing (seal plate). A leaking mechanical seal often leads to bearing failure.
  • Step 3 – Plan replacement: On Pentair variable‑speed pumps, bearings are not typically serviced separately in the field. Replace the motor/drive assembly or complete pump.
  • Step 4 – Replace mechanical seal: If you replace the motor, always install a new Pentair‑specified mechanical shaft seal to prevent repeat failure.
Advertisements

Repair Difficulty

Hard 4/5

Required Part

IntelliFlo Motor and Mechanical Seal Kit
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements