We thought the belt simply broke. Upon replacing it, we found we couldn't manually turn the brush. There's nothing noticeably hindering it from turning. The motor works, but the brush will not turn, causing the belt to melt.
Sounds like the bearings at the of the brushbar are seized up and need replacing you can get spares on the link below,
http://www.4bissell.co.uk/cgi-bin/product.pl?PID=972446&query=Bissell%203750%2dK%20Brushroll&model=3750%2dK&path=58757
Testimonial: "Thanks!!!!! "
SOURCE: how to replace pump for 7901 bissell pro heat steam cleaner
unplug unit first
take six screws out of housing.
lift of housing.
you can see pump at front of machine.
four screws hold pump in.
make sure all tubes are routed correctly.replace housing,
make sure no tubes are trapped
SOURCE: Bissell Proheat 2x Series 8920 - Brush Belt Metal Shaft Sprocket won't turn
Most likely the brush motor is bad and not turning, part #2036757, would sell for around $23. To get to it, start taking out screws on the top cover, that motor is under the that top access cover.
SOURCE: Bissell proheat 1698 cleaner not spraying water
MY CARPET CLEANER WAS NOT SPRAYING ANY WATER OR CLEANING SOLUTION. I TOOK THE BACK OFF OF THE HEATER THAT IS IN THE HANDLE. IT WAS CLOGGED WITH CALCIUM DEPOSITS. I CLEANED THE HEATER AND PUT IT BACK TOGETHER AND IT WORKS GREAT. KEN
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: bissell carpet cleaner brushes won't turn
Make sure you have released the handle, as if you wanted to push the machine forward. If the handle is locked upright, the brushes do not spin.
If they still don't spin, you may have a broken belt. Look carefully at the base, on each side. As I face the front of mine, on the right side of the machine, a small belt goes around one brush and a small cog wheel. On the left side, a larger belt goes around both brushes. If either belt is broken, the brushes will not spin. This can happen if you let gunk build up inside the clear plastic side pieces or around or above the brushes. It's very important to constantly be cleaning your Bissell. The belts can be ordered online and replaced. See your owner's manual.
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