Hi, on my Hoover (model U4311) the fan slips on to the shaft and is then held by a heat-insulating washer. It looks like some sticky stuff is used to make it rotate with the shaft better. My replacement fan was: H-38755011. I had to saw through the old fan - I couldn't get it unstuck. Hesco had the parts and schematics. Hesco U4309/11-series part number 24 is the pulley which screws onto the shaft and holds everything in place, and allows the belt to drive the shaft. I had to remove about 4 screws on the top-side to get the fan off, not counting the ones holding the housing on. One of the screws was tricky - I had to angle in from the side or else remove a part I didn't really want to remove. I was afraid I would break it.
J, April 2007