How To Change The Shaft Seal On A Hayward Matrix Pump


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If your Hayward Matrix pump is leaking, it is likely the shaft seal on pump has failed. A failed shaft seal can cause damage to your motor and should be replaced as soon as possible. This guide will walk you through changing the shaft seal and gaskets (if necessary).

Things You'll Need

Socket set with a 1/4" and 8mm socket

Clean paper towel

Flathead screw driver

Step by Step


Step 1

First and foremost, make sure that power to the pump has been cut off. Unplug the pump if possible.

Step 2

Disconnect the hoses by removing the hose clamp then sliding the hose off of the hose adapter. Place the hoses over the swimming pool wall so that the water doesn’t drain out of the pool.

Step 3

Remove the pump lid by gripping the handles on the side and slowly turning the cover counter clockwise, then pulling up towards you. Once the cover is off, inspect the cover o-ring and replace if necessary. Remove the basket and drain any water inside of the strainer housing.

Step 4

Next, we’ll need to remove the strainer. To do this, we’ll first need to remove the strainer basket to expose the c-clip that locks it into place.

Step 5

Once the basket has been removed, simply pull it gently upwards towards you to remove it.

Step 6

Pull the pump strainer housing straight out to remove it from the shroud assembly.

Step 7

Once the strainer housing has been removed, the 8 screws that hold the pump cover in place are visible.

Step 8

I recommend using a drill with a Phillips bit to remove the screws. It will make this part a lot easier. Once the screws have been removed, place them inside the strainer basket so they’re easy to find later.

Step 9

Once the front cover has been removed, remove the end cap on the motor. There is one screw that holds it into place. You can either use a 1/4" socket or a flat head screw driver to remove it.

Step 10

Move the cover to the side. The four thru-bolts should now be visible. Before removing the thru-bolts, we’ll need to remove the impeller.

Step 11

With a flat head screw driver, hold the end of the shaft in place while spinning the impeller off of the shaft counter clockwise. Place it to the side for now.

Step 12

Using a 1/4" socket, loosen and remove the thru-bolts. If you feel resistance, I would recommend stopping and contacting a professional. If the thru bolts snap, you may have to buy additional parts or a new pump. PROCEED AT YOUR OWN RISK.

Step 13

Once the thru-bolts have been removed, the pump housing can be removed. Make note of the pump housing position before removing it.

Step 14

Place the pump housing face down and use the tip of the screw driver to push the shaft seal out. Be careful not to push on the plastic seat that the shaft seal sits in.

Step 15

Once the ceramic half of the shaft seal has been removed, inspect and clean the pump housing making certain that the rubber seat of the shaft seal was removed as well.

Step 16

Next we will remove the “spring” half of the shaft seal from the impeller. You can simply pull to remove it by hand.

Step 17

If your impeller looks like this after that shaft seal has been removed, you still have one more step. Using the pliers, grip the remainder of the shaft seal and remove it by turning and pulling. Clean the impeller shaft and place it aside for now.

Step 18

Lubricate the shaft seal seat inside of the pump housing. Using a clean paper towel, pick up the ceramic half of the shaft seal (do not touch it with your hands) and push it into place.

Step 19

Once the shaft seal is in place, you can begin installing the pump housing back onto the motor. Line up the thru-bolt holes on the motor with the holes on the back of the pump housing.

Step 20

With the pump housing in place, lubricate the shaft of the impeller. Install the other half of the shaft seal onto the impeller.

Step 21

The black surface of the shaft seal should be facing you once installed.

Step 22

Using the flat head screw driver, hold the rear end of the shaft in place and thread the impeller back onto the shaft.

Step 23

Inspect the pump housing o-ring and replace if necessary. Lubricate the o-ring before putting it back onto the pump housing.

Step 24

Once the o-ring is in place, you can put the pump housing cover back on. Use the screws that you removed before to attach it to the pump housing.

Step 25

Before installing the strainer housing, inspect the o-ring and replace if necessary Lubricate the o-ring before putting it back on.

Step 26

Push the strainer body back onto the pump housing.

Step 27

Look inside of the strainer and make sure that the groove for the retaining clip is fully visible.

Step 28

Re-install the retaining clip inside of the strainer body.

Step 29

Re-install the strainer basket and fill the strainer with water to prime the pump. Inspect the lid o-ring and replace if necessary, lubricate the lid o-ring then secure the lid to the strainer.

Step 30

Turn the power on to the pump and check for leaks. If these are any leaks, turn off the power to the pump and repair the leak.

Step 31

Your project is now complete and your pump should be as good as new.


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 Posted: 7/26/2013 

Just wanted to say thanks for posting this step by step procedure. Without this to guide me it would have been much more difficult. I may have even opted to by a new pump instead. It took me approximately 30 minutes to complete this from start to finish.
Thanks again.