Remove the four screws that hold the roller brush retainer. Then remove the plastic retainer and you will see the broken belt that needs replacement. The spindle is toward the rear and is about the size of a large nail. Remove the old belt and replace it with a new one. You may have to use a screwdriver to get the new one into place. It needs to go around the plastic wheel and the spindle. Put it back together and your ready to enjoy enjoy self propelled vacuuming again.
Jerry Collins, September 2005