I swapped my motor, on my pump, out for a brand new one, yesterday. After putting on this new motor, I hear a rattling noise and the motor housing is hot to the touch. The rattling sounds like it is coming from the area of the front plate. The old motor was an A.O. Smith and I'm not sure what the new one is, but it is definitely running hotter than the first one. I took the pump assembly apart today to see if I could find the problem, but wasn't exactly sure what I was looking for. I put it back together and the rattling stopped for about 10 minutes and then started again. The sound is louder when the pump is on low speed, I don't hear it as much when on high. I only replaced the motor, everything else is the same and I never had this rattling sound before, so I'm thinking I didn't put it back together the right way. Does anyone have any ideas of what I can check?