I disassembled the original Smith 5452 blower motor that was not running smoothly. The rotor shaft had some surface corrosion and there was debris in the casing and bronze bearings. The output shaft bearing was seized onto the shaft. After cleaning everything, I started to reassemble and seat the brushes. When I went to place the brush assembly back over the rotor and commutator, I noticed that the brushes no longer lined up with the right spot on the commutator- it's almost like the rotor needs to be spaced up about 1/4" in the casing. The rotor is properly seating in the lower (blind) bearing, and there is no adjustment or spacer. The brush assembly cannot be reversed or flipped due to the length of the wires to the stator, and the plastic spacers are fully seated.
I spent an hour studying it and just couldn't figure out what was going on. Any thoughts? I'll try to get some pictures together.
I spent an hour studying it and just couldn't figure out what was going on. Any thoughts? I'll try to get some pictures together.