Im having some trouble with my vacuum after a complete teardown and rebuild. Greased,oiled and cleaned everything beautifully as well as replacement of the carbon brushes. Since I've done this and got it all back together,the belt lifter gets blazing hot,the belt seems to be riding on the edge of the belt lifter hook burning the belt, the motor is running slower and weaker And there is almost no suction. I've rebuilt 5 others the exact same and all work great and lay down a beating. What did I do wrong here? I'm stumped.. Thinking about it now more. Do you suppose the brush wires being accidentally put on backwards could do this?