It sounds like your roller brush itself might be bad. Try holding the roller brush holding just the end caps with your finger tips, and spinning the roller. Does the roller spin freely? If no, this indicates that your roller brush's bearings have melted together. This is a common problem for Bissell vacuums, as they use cheaper plastic bearing caps. The roller brush is not covered under the warranty either.
When this part goes bad, this causes the belt to break almost immediately. If you tried replacing the belt, and it broke immediately, your roller brush has gone bad.
Here's a link to the Bissell LiftOff Revolution rollerbrush on our site;
Bissell Roller Brush for Lift Off Bagless
Please leave me some feedback, or rate my solution helpful if this helped you fix your problem. Thanks so much,
Chris Jones
GoVacuum.com
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