Bissell 92l3 w

SOURCE: Dirtlifter Powerbrush does not turn

Make the machine safe from the power source first
When you remove the belt access door you are looking at the pump belt,
To gain access to the brush belt you must turn the machine over and remove the brush at the bottom of the machine.
there are two screw in the red retainers at each side of the brush, remove the screws and the retainers and the pivot arms ,you should see the brush belt and the pump

SOURCE: bissell proheat 9200

The brush roll motor is most likely bad (part #2036757). You will have to take it aprt and check it.

SOURCE: Bissell Velocity Vacuum brushes stopped

The brush bearings wear out on these things. I know I replaced mine twice before buying new carpet. I've had it for 10 years,
You can order these parts on the Bissell website:
http://www.bissell.com/Products/p/CleanView+Brush/product.aspx
http://www.bissell.com/Products/ak/replacementparts/p/CVPT+II/product.aspx?%23=Detail#Detail
http://www.bissell.com/images/UserGuides/35934_804.pdf

SOURCE: bissell lift off, brush won't move smell burning rubber belt fine

OK - so your brush roller is jammed. And yes, the belt is melting! Unplug the machine, remove the belt (you will need another new one anyway) then see if you can turn the roller by hand. If it turns freely without you doing anything else, then you may have put the new belt in incorrectly. However, you will probably find you can't turn it, or it's hard work (it should rotate freely). Remove the roller and check the bearings - there may well be something tangled up at one end of the roller. If you can get the roller rotating freely, all should be well.
Good luck

SOURCE: brush will not turn

Possible Solution: I had the same problem with my Powerforce vacuum. Please take note that I AM NOT a vacuum cleaner repairman, nor have I played one on TV. Try taking your beater bar out, and if it looks similar to the one pictured (Model#203-1195), get a cresent wrench. Look at the end of the beater bar one will be squared on the sides to hold the shaft inside statonary. Take the wrench and adjust it to fit the nub on that end. Grab the bar in the center, and turn the end with the wrench. Mine popped and came loose, then it could be turned by hand. A little light oil allowed to run into the end cap, turn it up and spin it a few times to let the oil work down the inside and put it back on. Mine works fine for now. Good Luck!!