Hi, it's Allie from Crucial Vacuum!
Changing the belts in your unit is easier than you think. To do so, you will need a phillips head screwdriver. First, start by unplugging your vacuum as a safety measurement. Using the lever in the bottom of your unit, recline your upright until it lays flat. Unscrew all 4 screws from the floor base cover and remove the cover to expose the roller brush and belts of your unit.
Carefully, remove the roller brush by using your hands, make sure to hold on to the side of the roller brush that has the belt so it does not pop out and hit you. Once the roller brush is removed, gently take the belt off the metal spool, and replace with the new belt.
We have a very helpful tutorial in our webpage that can assist you in replacing the belts on your unit:
https://www.youtube.com/watch?v=IFcjzuplX_o
You can purchase direct your replacement belts from Crucial Vacuum with free shipping and an exclusive 10% coupon for Fixya.com readers, use code: FIXYA10
http://www.crucialvacuum.com/eureka-style-u-belt-2pk.html
I hope this was helpful. If you would like further assistance, please feel free to give us a call at 877.750.9239. We have helpful and friendly customer care representatives on the line ready to assist you.
Alejandra (Allie) Sepulveda-Rivera
Crucial Vacuum Customer Care
http://www.crucialvacuum.com