Monday, February 8, 2016

Hayward TriStar Motor Replacement

Hayward Tri-Star Motor Replacement

This was a motor replacement for a Hayward Tristar 2 speed motor done by us at Wine Country Pools and Supplies. This is not meant as a how to guide; it will show you how this specific motor was replaced.

Parts needed:
Replacement motor
9/16 Socket wrench
1/2 Socket wrench
Square bit?
3/16 Allen wrench
PS-3890 Pump Seal
ALA-601-5506 Volute O-ring
SPX3200T Housing O-ring
Phillips head screw driver
Flat head screw driver

All breakers to the pool equipment are turned off.

The pump is connected to the plumbing system by two quick release unions.
Removing both of these allows the motor to be moved.

The motor can now be moved, and the backside can be accessed to remove the electrical wires, freeing the motor.

Note: the grounding wire connected to this motor was removed with a flat head screwdriver but it is not shown in the photos.

At the back of the motor, the rear cover can be removed by first removing the two flat head screws, then pulling the plastic cover away from the motor.

There are three hot power lines. One is shared (tan), one for low speed (blue), and one for high speed (blue red). The power wires were already marked on this motor by the installer. The green is the ground wire. All the wires need to be disconnected.

The conduit elbow needs to be loosened so the wires can be pulled out of the motor.
(No picture)
To separate the front of the pump from the motor, a ½ inch wrench was used to remove the 6 bolts (3 on each side).

The two halves can now be pulled apart.

To remove the volute, two square head screws were removed. The volute can now be pulled off, and away from the motor.

The impeller ring can be pulled off. Make a note of the side that the raised edge faces.

To remove the impeller, first the center screw needs to be removed. A 3/16 Allen wrench was used. This is a reverse thread screw.

To unscrew the impeller, the motor shaft needs to be held in place. A wrench was used to hold it in place from the back.

Then the impeller can be unscrewed and removed.

To remove the motor from the seal plate, 4 9/16 bolts needed to be removed from the back of the seal plate.

Now the seal plate can be pulled forward away from the motor.

On the seal plate, the old seal was removed with a flat head screwdriver, pushing it out from the backside.

The new motor and the old seal plate are reconnected with the 4 9/16 bolts.

The new half seal (PS-3890) (the larger half) is inserted with the metal side facing the inside of the seal plate. A flathead screwdriver was used to push it into place.

On the impeller, the old seal needs to be removed using a flathead screwdriver. Now the new smaller seal piece is inserted into the impeller, with the rubber side facing the impeller.
(No picture)

To tighten the impeller to the motor, the shaft needs to be held again from the back of the motor. While holding the shaft in place, the impeller can be screwed back on to the motor with the new seals already in place.

The center screw needs to be reinserted into the impeller using the Allen wrench. Note again this is a reverse threaded screw.

The impeller ring was reattached, paying attention to the correct side of the raised section.

The volute was reattached using the two small square bolts.

The new volute O-ring can be attached.

The new seal plate gasket is set into the seal plate.
The front of the pump and the motor can be reconnected.  They are first pushed together, and then the 6 1/2 bolts are reinserted to hold them together.

To connect the conduit elbow, a plastic screw needed to be removed.

Once the pump was put back together, it needed to be rewired using the new motor diagram. The motor didn’t list high, low, and common on the backside like the previous motor, but did have a diagram on the side.

Unions and grounding wire were reconnected.

The breakers were turned back on and the system was back up and running.


  1. Cool Blog have! I will just wanna say thanks 4 that. If u would to visit my website visit it now. Thanks for your visit!
    Swimming pools equipment installation

  2. This is a really good read for me, Must admit that you are one of the best bloggers I ever saw.Thanks for posting this informative article. I really like the fresh perceptive you did on the issue. I will be back soon to check up on new posts! Thank you!
    Florida pool store