Sliding the height adjustment knob does not adjust the wheel height. From the underside, the tab, connected to the adjustable wheel plate, does not come in contact with the bottom of the sliding height adjuster.
In addition to the tab that contacts the bottom of the slider, there are 2 protusions on the adjustable wheel plate that move through holes in the housing, but only when the handle is tilted to begin vacuuming. The wheel plate has a spring that forces the tab against the slider. As the handle is moved to the upright position, the protusions move back through the holes, taking the tab away from the slider and the wheel plate locks in its highest position. Therefore, the position of the slider has no effect while the handle is upright and locked. Hope this helps.
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Have you tried changing the height adjustment? There should be a knob or lever that allows you to adjust the height of the beater brush to accommodate different carpet lengths. Even with a new belt, the brush will not spin if the height is too low. Try adjusting it all the way up, then while it is running, adjust it down until there is some resistance. The beater brush should just barely scrape the top of your carpet.
Make sure you're not trying to adjust w/ handle in upright locked position because thewre is a cam which raises the vacuum head a little bit when handle is locked in upright position. If this is not the problem, turn vacuum upside down with handle in unlocked position and power cord not plugged in(for safety reasons obviously), unscrew and remove 3 screws that hold belt/beater brush assembly cover in place(2 are in corner near ends of beater brush and 1 is towards motor housing) tilt end of cover with 1 screw up and remove cover(there are 2 tabs at beater brush end of cover). Right above this is the height adjustment assembly with 2 rollers, raise up the assembly gently and using your finger or a bristle bottle brush,etc. make sure there is no debris caught between the height assembly and the hose(you will understand when you see it), if there is no debris you can now see the pattern on the bottom of the height adjustment knob and the lobe that rides on it, just check to make sure nothing is broken and/or missing, hope this helps!!
In my experience, Hoover height adjustment are "stops" rather than being attached to an axel. Look for something that rould resemble a set of circular steps somewhere in the path the axel would take as it goes up and down. It is usually on the underside from the knob that sets the height. Each 'step' represents a height with the shortest step being the lowest setting from a certain perspective.
On some Hoovers, therte is a ratchet petal on the right side. The ones I have seen are similar in operation to the above.
The height adjustment wont engage unless the handle is in the down position. Not knowing this led me to overturn the hight adjustment knob.
Step on the handle release, pull the handle back and lay the vac on its side. Then you can get the knob and the plate back together again.
BTW, the reason I had this problem is because the front brush slows dramatically when using on carpet, I thought it was set too low, and turned the knob (in a manly fashion, putting it past its limit). Still working on that one. After inspecting the belt, looks like one worn and cracked spot gumming up the works.
It is possible that the height adjustment on your Kirby is to close to the carpet,which could account for the problem you're having.The correct height adjustment for your Kirby is this-Lower the height adjustment down until you hear a change in the sound,then adjust one more click down.The Kirby is at the correct height for cleaning.If the carpet is different in another room,adjust it the same way for each carpet