Question about A.O. Smith Pool Pump Motor Square Flange 25 HP

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A. O. Smith 1 1/2 hp. motor Type SP. Humms then

A. O. Smith 1 1/2 hp. motor Type SP. Humms then trips breaker. No burnt wiring. All looks new. Could stationary switch be dirty? Motor will start if I turn the shaft a little then turn on power again.

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You have a failing start/run capacitor. Take the motor to your pool supply place for repair.

Posted on Aug 04, 2010

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In my case the motor turned, but made a horrible sound and then caused the circuit breakers to open. I found this problem after moving and reconnecting the motor. I was supplying 230V to the motor, but apparently the "shunt" was set at 115V instead of 230V. (By "shunt" I mean the black plastic cube that you plug over the electrical lugs to select 115 or 230VAC.) I don't know how this happened. Perhaps I took off the shunt when attaching the power lines, but replaced it incorrectly. However the motor had been working normally for weeks until the problem developed. Perhaps the shunt was not making good electrical contact.

Posted on May 06, 2012

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To be certain it is the motor, disconnect the line leads and be sure they are insulated from ground and one another. Turn the breaker back on. It should stay closed which confirms it is the motor tripping it when connected.

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ASSUMING THIS IS SINGLE PHASE HAVE YOU CHECKED THE CAPACITORS. START CAPACITOR COULD BE BAD OR BURNT LEAD. HAVE YOU MADE SURE THE PUMP IS NOT LOCKING UP. POINTS IN THE PRESSURE SWITCH LOOK GOOD. HOPE THIS HELPS, JODY

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