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Pump Rebuilding Guide
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Pump Rebuilding Guide

Step 1 - Start Here

Here is our assembled pump. If you have a leak between the pump and motor or need to replace the motor or unclog the pump impeller, this is the procedure you want to follow.


Inspect The Pump Lid

This is the pump lid. The o-ring and pump lid are a vital to the performance of your pump. A lid inspection is an important part of any pump repair. Look carefully for cracks in the lid or o-ring, replace as needed. Sometimes cracks in the lid are hard to see, but will cause the pump to lose suction when running. If this happens you will see air under the pump lid while running and have a decrease in pump performance.


Step 2 - Open The Pump Housing

You first need to separate the two halves of the pump. In this case we have bolts holding the pump together, other pumps can have steel clamps or screws.

Inspect The Volute O-ring

This is the opened pump showing the o-ring that seals the two halves of the pump. You generally will want to replace the o-ring or gasket when you open the pump.


Step 3 - Inspect the Diffuser O-ring

This is the diffuser o-ring. Your pump can lose performance if this is not in good shape. On some pumps this can still be inside the front half of the pump at this point. Some pumps can be very difficult to put back together if you do not replace the diffuser o-ring while rebuilding the pump.

Remove The Diffuser

We are now removing the diffuser. Not all models of pump have a diffuser.


Step 4 - Inspect The Impeller

With the diffuser removed we see the pump impeller underneath. Inspect the impeller to ensure nothing is clogged or trapped inside it.

Prepare To Remove The Impeller

Go to the rear end of the pump to prepare to remove the impeller. First remove the cover and expose the rear end of the motor shaft. As you can see, there are different styles of end cap, depending on which motor you have.


Step 5 - Remove The Impeller

Use the appropriate tool to hold the motor shaft. There are several styles of motor, but they all have some method for holding the shaft. We want to stop the motor shaft from turning so we can remove the impeller.

Unthread The Impeller

Holding the motor shaft stationary, we unthread the impeller counterclockwise. These can be quite stuck. Sometimes you will break the impeller getting it off.


Step 6 - Shaft Seal

The impeller comes off exposing the shaft seal. You always want to replace the pump seal when opening the pump.

Remove The Seal Plate

Now we take the last half of the pump off the motor. These attachment points vary by pump, look carefully and you will find them.

On some pumps the motor is attached by long bolts that run the entire length of the motor; in this case they will be found at the far end of the motor.

On some pumps the seal plate will pull off by hand after the motor is removed and there will be another piece of the pump underneath it that bolts onto the motor.


Step 7 - Motor Replacement

All that is left is the motor. If you are going to replace the motor you need to disconnect the wiring at this point and put your new motor in.

if you need help selecting the correct motor for your application be sure to consult with our staff.

A Note About "Up-Rated" Motors.

An up-rated motor and a full-rated motor are often the same motor with two different labels. This means that an up-rated 1 HP motor as the same as a full-rated 3/4 horsepower motor. You will sometimes see motors or impellers on our site listed at two different horsepowers. This is dependant on how the manufacturer marketed their pump.


Step 8 - Replace The Pump Seal

This is the rear half of the shaft seal. Some of the shaft seals will pull out by hand, some (like this one) are set in metal cups and need to be tapped out from behind. We recommend putting a little silicone sealant on pump seals when you put them back in.