Nut was loose and the fan was hitting the cover bracket. Removed the cover bracket and the nut fell out (as expected). The nut doesn't seem fit back on the motor shaft. Can the nut be defective in some way? If this why it fell off? The motor shaft seems to be in good shape? Would replacing the nut solve this problem?
Either the nut or the motor shaft is stripped. This is the most obvious answer to the issue. I would try putting red lock-tite 59133109 on the threads and if it comes off again, I would replace the motor and the nut.
Answered by AppliancePartsPros.com | Friday, September 28, 2012