The brushes won't spin when placed on the carpet. They spin just fine when I lift the vacuum up just a little bit (so they're not really touching or cleaning the carpet), but not when they meet the resistance of the carpet. I have checked for clogs. I seem to have at least some suction both through the floor unit and through the tools hose. It does not matter whether I have my height adjuster on hardwood floors or carpet, they just won't spin when they hit carpet. I am not getting the "sweeper marks" on the carpet and only moderate cleaning. The unit (U5753-960) is about 8 months old.
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Does it have a "brushes" lowering/higher switch?
Normally due to brushes being too low in particular on deep pile carpets??
check the actual fixings for the rotating brushes are ok and the brush not simply need "clicking" back into place?
Sounds like you need to take the brushes off the unit and clean the end pieces that the brushes rotate around. Not uncommon that they get dirty and stop rotating. Clean all debris and add a little WD40 on the end of the bush rods that the brush spins around.
Make sure the belt is on properly.
The brushes turn by the airflow from the vacuum suction turning a turbine motor to spin the brushes. First try to spin the brushes by hand. If they won't turn it usually means the brushes are clogged with hair and debris or need replaced or the turbine could be seized up. If the brushes won't spin reach under the brushes and push the little tabs and remove the brush block asssembly from the machine. If the brushes spin freely after you remove them from the machine then that means that most likely the turbine is seized and will need to be repaced. If the turbine is not seized you may simply just have a clogged filter screen. Most steam vacs have a red screen filter either on top or underneath the machine. On the top it is under a little clear plastic cover that you have to pry off before you can pull the screen out to clean it. If it's underneath you can pull it out and clean it.
I have the SteamVac Dual and there's a screen on the underside of the unit. It's beneath the brushes and it's red. You have to pull and wiggle it to get it out. With the machine unplugged, lay the unit with the handle on the floor. In the owner's manual ( http://www.hoover.com/pdfs/manuals/F7222900.pdf ) this is shown on page 10 figure 3-2. Clean that screen. If they still won't spin, then take the brushes out. Again, with the unit on the floor, you simply grab the unit firmly and pull towards you. It's much easier to remove than the screen. I took the brush unit outside and blasted it with the house. You'll have to pull out whatever fur balls are clogging it but eventually you'll see that the brushes spin freely with the water squirting on them. Plug the brush unit back in and - in my case - they started spinning.
It could be that you have the brush settings wrong for your carpet type. Check if the brushes are on number 3, if so, try dropping them down a notch or two and see if that does it.
I think that the brushes when spinning spin towards you, so when pulling the vacuum back, the brushes are helping to drive, when pushing forward, you are pushing against the brushes. If the brushes are sticking out too far, it could cause bouncing/jumping.