[USER=1183]@ultimatevacman[/USER]
If a ball bearing is bad, it will always cause noise and vibration, at start up, during running, and upon shut down. In a few instances of very old cleaner being used for the first time in decades, the grease in the ball bearing has to be liquefied by running in order to lubricate the balls in the bearing. But generally, a bad bearing will always make the noise.
