Why would the nut (part number W10163336) which holds the pulley in on the bottom of the shaft keep coming off. It has come off every 2 loads since I put it on and will not stay on. Does it need a lock washer to keep it on.
You will want to make sure that the bolt is tight enough to stay in place but you may also want to try Loctite to hold the bolt on. If the bolt still comes off then you would need to replace the shaft that the nut screws onto.