I have a floor fan with metal stand and cage, 3 speed. It picks up dust and lint and I cleaned it and oiled the front and rear shaft bearings and it ran fine till this morning and it squeaked like dry bearing so turned it off and cleaned it and oiled it and when plug in and turn on nothing happens. I read the thermal breaker may have tripped and will reset on it;s own. So far nothing, no hum or anything , just kaput. Looks like motor is sealed so is there a way to work on it? It was running great the other day so don't know what broke on it. Any ideas ?