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Electric fan motors have a common problem of the bearings binding up and stopping the armature from turning. This might be caused by accumulated dirt, or even the bronze bushings (the bearings) actually shrinking. They can shrink over time because their retainers push in on them constantly. If you can not get a replacement motor (or don't want to spend the money), you can try what I have done in the past. You can take apart the motor and drill out the bushings with a drill bit. Also polish the armature shaft where it rides in the bushings. But, if you drill out the bushings too big the motor will rattle. Oil the bushings when you are done. If this sounds like too much work, you can try just spraying the bearing surfaces with a penetrating oil.
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