Turn off and disconnect the Hoover vacuum cleaner from power. Wait a few minutes to allow the device to cool.
Lower the handle and turn the vacuum cleaner over. Release the latches on each side of the bottom plate and remove the plate from the unit.
Lift up on the agitator to remove and release the old belt from the pulley system. Discard the old belt.
Set the new belt into the agitator grove and line up the end of the agitator with the slot in the wall of the vacuum base. Push the other end of the agitator into the vacuum.
Pull the belt over the pulley, in line with the projections on the cleaner bottom. Set the bottom plate back into position by inserting the knobs on the plate front into the wire holders on the vacuum.
Push the bottom plate into position. The latches should push back. Restore power to the vacuum.