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changed vacuum belt, but still smokes and melts belt?

Changed vacuum belt on two; one burns the belt off, the other has no suction & starts to smoke slowly
cpolendo, December 2010
1 the one that snaps the belt
strip down check the brush roller end caps they MUST turn FREELY on the brush spindle
2 the other one is overheating blocked motor filter/vents or possible worn motor brushes

wirecutterman, January 2011