Hi Everyone. I have a Century AO Smith (I think 1 HP, it's a little unclear) motor. When I went to start it, it would just hum and pop the circuit breaker. I tried to manually turn it with a screw driver, but couldn't get it to start. I resorted to using a power drill, which I ran for a few minutes, and I had the motor shaft spinning freely. I ran it for a few hours, and everything was fine. The next day, it was completely frozen again. Used the drill, got it going. The next day, it started up, ran for about 2 hours (probably the best I've ever heard it run), and out of nowhere it shut off. Here's where I am a little lost. The impeller and shaft still spin very freely, but when I turn the power on, it completely binds up. The second power goes off, it spins freely by hand. The motor doesn't have capacitors. I'm trying to figure out why it binds when the power is applied. Could the switch somehow be tripped, or bad phase windings, or something completely different? I have a new motor hooked up and running the pool, and was only going to keep this as an backup (though I don't plan on the current one breaking anytime soon). I'm really curious why this isn't working, because it seemed like it would stay running for a long time after the initial corrosion was all broken free. Thanks in advance!