I am an Electrician. I came home one day and turned my motor on. It was making the same noise. I took out my voltage tester and I wasn't getting the correct voltage off the capacitor. I took it down to the pool shop and they just told me I needed another $400 motor. I wasn't able to do that again (would have been my second one in a year), so I took the capacitor out and went down to the electronic warehouse. $30 later it was fixed. It would be worth a shot just to try it. Also, if your motor is or is able to draw more amps then it should, I would take a look at the breaker that is supplying the circuits.

Chris