There is an adjustment for carpet and for hard surfaces. Have switched it from carpet to a hard surface. When on carpet it sets up higher on a hard surface it should set lower. If it is to low it work properly either.
Sonja, Recheck belt installation, see if it is riding in proper groove or is twisted.
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I think it is normal. My favorite setting is the dial is turned to bare floor. If you set your vacuum to hose, then you need to adjust the height (do not set the dial to the bare floor).