How to Repair a Pool Pump Seal

Your swimming pool pump has a seal to prevent leaks, which can destroy the electric motor on the pump. When the seal wears out and starts to leak, you must replace it. Since the seal components are similar on most pool pumps, the replacement process is relatively simple and doesn't vary much from pool to pool.

Things You'll Need

  • Wrench
  • Impeller wrench
  • Cloth
  • Lubricant
  • Pump seal
  • Gasket


    • 1

      Turn off the electricity to the pump motor at the breaker box.

    • 2

      Remove the bolts holding the two pump halves together and pull the motor and bracket away from the volute to expose the impeller (a volute is a curved funnel increasing in area to the discharge port). Remove the old gasket between the two pump halves.

    • 3

      Hold the motor shaft so that it does not turn while you unscrew the impeller, using an impeller wrench.

    • 4

      Remove the bolts holding the bracket on the motor, using a wrench, and separate the bracket away from the motor.

    • 5

      Remove each half of the old seal and clean the seal plate and impeller, using the cloth and water.

    • 6

      Apply lubricant to the seal plate and install each half of the new seal, being careful not to touch the face of the seal with anything dirty or greasy.

    • 7

      Reassemble the bracket and motor and replace the impeller. Place a new gasket between the pump halves and reassemble. Tighten bolts evenly.

    • 8

      Turn the electricity back on to the motor and check for leaks by letting the pump run for several minutes.

Tips & Warnings

  • Note the position of the old seal on the seal plate and impeller and install the new seal in the same way.
  • Use non-hardening silicone lubricant. Lubricants made of petroleum eat away plastic parts.
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  • Photo Credit swimming-pool image by Aleksandr Ugorenkov from

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