Hi dfabin,
Does the screeching come from the motor area or the brush/belt area?
If it's from the motor. Turn it off. It needs repair.
If it's from the brush/belt area, most likely your belt is either slipping or rubbing on something.
Do you have an owner's manual?
If you do, and the noise come from the belts, take the belt(s) off and check them for wear, stretching, anything imbedded in them. Be sure to clean all debris out of the area. and reassemble. If still noisy, the belt may be slipping and needs to be replaced.
Here's a site where you can view the parts breakdown and order parts: http://www.vacpartswarehouse.com/Bissell-Healthy-Home-Models-5770-5990-6100-6405-s/600.htm
Hope this helps. If it does, I'd appreciate a vote. Thanks,
Handie Andie
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