upright886
Matt,
Maybe check the belt for wear. If so, order part no. 1044260001.
Or else, check if the brush roll is properly mounted. It can only be installed one way. If brush bristles are worn on position 1, there are two other positions to try: 2 and 3.
If the problem isn't the belt or brush roll, maybe your fan is going out of bounds. Order part no. 1608004000, though it will have nine blades rather than six.
~Ben