Bissell 3750 Lift Off Bagless Upright Vacuum "cleaner sound siren" Questions

cleaner has recently started making a sound like an air raid siren. We have cleaned all filters no difference the noise is terrible. Check the drive belts for wear and tightness and make sure that the

...sound as shaft spins on loose belt definitely check the belt condition, but I would check the airpath first. Start with the hose, it is very easy to remove and if you hold it to the light can see a ...

...cleaner began making a high pitch sound that makes it very annoying to vacuum. I cleaned all the things I could clean. I even cut out all the hair that was entangled in the brushes. Any idea what is ...