Vacuum Cleaner When I vacuum it doesn't pick up; in fact it leaves hair and debris behind while pushing vacuum forward. Is this a belt problem?

check belt under unit if ok possible build up of hair in bearings not letting wheels move

The belt may be broken or worn If your cleaner is not picking up fluff and hair from the carpet or has become heavy to push it is possible that the belt has snapped. This belt makes the sweeping brushes spin round underneath the cleaner and brush dirt into the path of the air suction. The brushes also give that 'groomed' look to your carpet by gently brushing the carpet fibre. If you pick up something sharp or debris gets jammed in the brushes then the belt may snap. Also over time your belt will stretch, so it's a good idea to change your belt once per year to ensure the cleaner picks up dirt effectively.

could be as simple as a broken belt or a clogged hose run a broomhandle through it or a plummers snake also check filters for dirt

see this causes and fix it. God bless you
If the vacuum cleaner brush is not spinning, the brushroll bearing might be jammed. Try removing the brushroll assembly and cleaning all hair, string, lint, etc. from the brushroll bearing. If that doesn't solve the problem the brushroll may need to be replaced.
If the vacuum cleaner brush is not spinning, the brushroll assembly itself might be jammed. Try removing the brushroll assembly and cleaning all hair, string, lint, etc. from the brushroll bearings. If that doesn't solve the problem the brushroll may need to be replaced.
If the vacuum cleaner brush is not spinning, the brushroll itself might be jammed. Try removing the brushroll and cleaning all hair, string, lint, etc. from the brushroll bearings. If that doesn't solve the problem the brushroll may need to be replaced.
If the vacuum cleaner brush is not spinning the cogged belt might be broken, stretched out too much, or might have fallen off. Check the belt and replace as needed.
If the vacuum cleaner brush is not spinning the drive belt might be broken, stretched out too much, or might have fallen off. Check the belt and replace as needed.
If the vacuum cleaner brush is not spinning the belt might be broken, stretched out too much, or might have fallen off. Check the belt and replace as needed.

you need to replace the brush and also the vaccum needs cleaning internally as it sounds like there might be blockage around the motor

Remove side cover below is a small piece of red plastic with screw attatched check to make sure belt is not broken or for some reason come off. Could be hair build up or your vaccum cleaner is not picking up enough dirt and debri causing it to clog. Steve

It is because the belt is worn and stretched. when you go forward there isn' t as much resistance and the brush can turn and pick up, but when you go back there is more resistance and doesn't pick up. You simply need to replace the belt. Here is the belt you need:

Eureka Boss 5849 Belts

It is because the belt is worn or stretched and needs to be replaced. Here are the belts you need and the manual which has instructions:

Bissell Pet Hair Eraser Belts and Manual

This sounds like the beater belt is slipping and may be due to the fact that the beater brush is not secured correctly or there is debris / grease build up inder the belt. Try cleaning it with Methylated Spirit and repalce the belt. Do not clean the belt with this. Also do not use Surgical Spitit as it leaves an oil residue. If the belt is still a problem then replace it.

The way I resolved the problem was to remove the cover at the end of the power paw. Then remove the so side black covers for the shaft. Remove any debris and hair and then put back together. This solved my problem.