Home » Tony’s Tips » Articles » QSB Screaming Fan Hub Bearing FailureQSB Screaming Fan Hub Bearing Failure Here’s the source of that annoying screech here’s your culprit, the bearing beneath that hub has failed, removal is fairly straight-forward Profile of where your fan hub attaches, note you will have to remove it from your QSB Lock down the hub mounting point on a vise to remove this backing plate, you will have to re-press the bearing back into this mount, or have someone do it for you.