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Thanks for the reply. 1) Perhaps. But for the brief period that it DOES function, it appears to do so normally. No abnormal noise or apparent struggling. 2) I can spin the pump's shaft freely with my fingers. (The motor drives the pump.) This also happens when the motor is disconnected from...

Please excuse my ignorance. I know what a capacitor IS, but not sure of its implementation in this context. Are you referring to something external to the motor, or something inside it? I have had the motor apart and there is "something" at the far (from the pump) end that's part of the...

I have a Bell & Gossett series 100 booster pump. The motor/power pack shuts down after 5 seconds of operation, cools down, runs for 5 seconds, etc. The motor makes no abnormal noise, and this happens even when it starts cold. I suspect a failure of whatever mechanism it is that detects and...