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Replacing Your Sta-Rite Pump Seal

Click here for a printable copy

  • Turn power off at the GFCI.
  • Remove the access door to the equipment area.
  • Unplug the motor at the electrical control can.
  • Close the slice valves if your spa has them. (Otherwise, drain the spa.)
  • Loosen the 2 pump unions.
  • Loosen any mounting bolts and remove the pump assembly from the equipment box.
  • This job is best done on a workbench.
  • Step 1:

    The tools required include a flathead screwdriver, 90 degree screwdriver (or garbage disposal wrench), and 1/4” and 3/8” nut drivers.

  • Step 2:

    Remove the four bolts on the front case.

  • Step 3:

    Remove the front case, leaving the impeller showing.

  • Step 4:

    Grab the impeller with one hand. Carefully place the 90 degree screwdriver, or the flathead screwdriver, in one of the veins inside the motor. (The 90 degree screwdriver is less likely to damage the motor veins.) It takes a bit of patience, but you should be able to stop the shaft from turning and loosen the impeller by hand.

  • Step 5:

    Remove the impeller.

  • Step 6:

    On the back end of the motor, loosen the screws and remove the shroud.

  • Step 7:

    Loosen the 4 thru-bolts.

  • Step 8:

    Pull the bolts back a few inches, but there is no need to remove them.

  • Step 9:

    Now the volute can be removed from the front of the motor.

  • Step 10:

    Remove the rubber washer (aka “slinger”) from the motor shaft.

  • Step 11:

    Remove the spring assembly from the impeller shaft.

  • Step 12:

    Lubricate the shaft with liquid soap from the kitchen or O-ring lubricant, and slide the new spring assembly, flat edge (with green dot) down. The spring assembly should go all the way down the shaft of the impeller.

  • Step 13:

    From the back side of the seal plate, use the screwdriver to push the ceramic disc out of the seal plate. With just a little pressure, it will pop right out.

  • Step 14:

    Wipe the ceramic disc seat with a clean rag, removing any old dirt or grime.

  • Step 15:

    Pumps use mechanical seals with a rubber seat ring. Coat this rubber surface with a thin film of clear RTV silicone. Wipe off any excess silicone that may have gotten on the white ceramic surface.

  • Step 16:

    Using a clean, dry towel, push the ceramic disc (with white side facing up), firmly back into its seat. Wipe the white ceramic surface clean once it’s on place. A dirty or oily surface will cause the seal to leak prematurely.

  • Step 17:

    Remove the large O-ring and wash it with soap and water. An old O-ring will deteriorate over time and must be replaced. If it’s still in usable condition, clean the groove it sits in. Lubricate the O-ring with liquid soap from the kitchen and return it to its seat.

  • Step 18:

    Re-install the impeller back into the seal plate.

  • Step 19:

    Return the washer back in place. If the washer is lost or damaged, proceed to step 20. This is not a critical item.

  • Step 20:

    Put a few drops of lubricating oil on the end of the motor shaft. Re-install the back plate assembly by tightening up the thru-bolts from the back of the motor. Then turn the impeller until the shaft begins to spin.

  • Step 21:

    Grab the impeller with one hand. Carefully place the 90 degree screwdriver, or the flathead screwdriver, in one of the veins inside the motor. (The 90 degree screwdriver is less likely to damage the motor veins.) Remember, patience is a virtue when getting the screwdriver in place. When the tool is in place, give the impeller one last turn to the right. This insures the impeller is tight on the shaft.

  • Step 22:

    Re-attach the front case.

  • Step 23:

    Reinstall the shroud.

  • Step 24:

    Reinstall the pump, open the check valves if your spa has them, or refill the spa.

    Turn the power on at the GFCI.

    Remember that pumps should only run with water in the spa or there is a risk of burning up the motor.

    Pump seals may take time to “seat” themselves, so don’t be surprised if there is a small amount of dripping water for up to ½ a day.

Click here for a printable copy

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