Pool pump seal plate replacement on a daylight equipment pad

How to Replace a Pool Pump Seal Plate

June 2, 2026

The pool pump seal plate is the metal or plastic disk between the wet end (strainer pot) and the motor that holds the shaft seal in place. If yours is cracked, warped, or corroded, the pump leaks and the shaft seal can’t seal correctly. Replacement is a 30-minute job during a motor swap.

When to replace the seal plate

Visible cracks in the seal plate.
Corrosion or pitting on the motor-facing surface.
Seal plate is warped (won’t sit flat).
Threaded bolt holes are stripped.
You’re upgrading from one pump generation to another and the seal plate is different.

Step-by-step replacement

1Power off and depressurize.

Cut power at the breaker. Drain the pump.

2Separate the motor + seal plate from the wet end.

Remove the perimeter bolts holding the assembly to the strainer pot. Pull the motor assembly straight back.

3Unscrew the impeller from the motor shaft.

Reverse-thread — counter-clockwise. Hold the shaft from behind. Use a strap wrench around the impeller if it’s stuck.

4Unbolt the seal plate from the motor face.

4–6 bolts hold the plate. Loosen evenly in a star pattern.

5Remove old shaft seal halves from both the seal plate and the impeller.

Pry gently with a flat screwdriver.

6Bolt the new seal plate onto the motor.

Torque per manufacturer spec, typically 8–12 ft-lb.

7Install new shaft seal halves.

Lubricate boots with silicone pool lubricant. Press the stationary half into the seal plate (polished face out); press the rotating half onto the impeller hub.

8Reinstall the impeller (clockwise).

Hand-tight. The pump’s rotation self-tightens during operation.

9Replace the pump body o-ring and reassemble.

Drop the motor + new seal plate into the strainer pot. Tighten perimeter bolts in a star pattern.

10Restore power, prime, and check for leaks.