two speed pump motor fine on low only clicks on high

[richd23]

Hello, I have a 30' x 18' above ground pool with an Aquatools cartridge filter based system. The 1.5 hp AO Smith pump motor has a two speed switch on the motor. Background....system is about 5 years old, typically run 4-5 months per year; pump is drained and stored in a dry garage when not in use.

Lately I noticed the flow output in low speed mode was reduced somewhat (I usually use the low speed) but the pump is still very quiet and not hot. I started using high speed more often and that was fine with great output, then suddenly started to only make a repeating clicking noise, only when switched to high speed; low speed still consistently running quiet, cool, but with the reduced output.

So any idea about the clicking noise from the motor, only in the high speed switch position?

 

[mas985]

Welcome to the forum!

It could be the centrifugal switch in the back of the motor. Sometimes the springs break, come off or the governor gets stuck.

 

[richd23]

Hi, thanks for the reply. Do you know of any links to diagrams or instructions to locate, identify and repair the centrifugal switch.
I did take the outside back panel off (one screw) the motor (AO Smith, correction, 1HP). where wiring connections can be seen; the large capacitor is also in this area; didn't see much else. I carefully powered up and tried low speed, which works normally. When I switched to hi speed the clicking was accompanied by some observable sparking inside the next layer. Looks like I might get in there by removing four small hex-head screws.
Appreciate any guidance.....Rich

 

[mas985]

Take a picture of the back end of the motor without the end cap and maybe I can see something. But if you are getting sparks inside the motor where the windings are, then it is probably a problem with the windings and you will need to replace the motor.