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Re: Carpet height selector doesn't work.
You have a bad belt. It may not be broke but it's so loose that it isn't turning the brush roller when a little resistance is applied to it. That belt is cheap and it's routine maintenance to change it about every 6 months. You will notice a big difference when you put a new one on.
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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.
Change the belt on the unit, and adjust the height adjustment until the brushes are just touching the carpet. I know you mentioned the belt looks good, but when you get the new EXT-U belt, you will notice a size difference.
Check to see that the beater brush is not frozen up. Pull the brush and clean it, spraying some WD40 on each end piece that holds the brush in place.
Also be sure the belt is properly installed so that the brush turns in the correct direction.
If the brush is not turning or not turning in the correct direction, it will not beat the dirt from the carpet so that it can be picked up by the vacuum's suction.
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!!
Don't forget that you have a height adjustment control so its better to put it in the highest position - if this is not allowing the roller brush to move properly on the carpet then switch the vacuum off, and lightly trim with scissors on the brush lines. Avoid cutting everything down though - a slight trim should improve things. Generally though when brushes appear too long its usually because the height adjustment dial hasn't been set upwards.
your floor adjustment spring is broken there is a plastic slider and clip if it is broken the height adj will not work you should get a new vacuum because this repair can cost as much as a new vac.also this is a common problem with the hoover brand I would get a sebo or an oreck they have a great warrentty and you will more than likly never buy a other vac.
YOU MAY HAVE A POSSIBLE BAD BELT OR THE MOTOR THAT RUNS THE BAR MAY BE BAD, THE OTHER POSSIBILITY IS THE SWITCH THAT TURNS ON THE BAR MAY BE BAD. OR A WIRE COULD HAVE COME OFF THE MOTOR. i THINK YOU DO KNOW THAT THE BEATER BAR DOES NOT RUN WHEN ON WOOD FLOORS.
It is a simple fix that you need. Your belt needs to be replaced. After a period of time, the belt stretches to the point where it is still strong enough to spin the brush when you have the machine upside down to look at it, but when you put the machine down on the carpet the belt is too weak to turn the brush against the resistance of the carpet.
Most Eureka belt changes are simple to do and the belts are inexpensive.
I just replaced the belt on my Eureka The Boss Smart Vac (Model 4870D). I purchased a namebrand Eureka R belt from a local vendor. I did my best to follow the instructions printed on the bottom of the machine. I turned on the vacuum cleaner and the belt brush was spinning! I dropped it into vacuuming floor mode and the belt wouldn't spin no matter what level I put it on.
I called the manufacturer (1-800-282-2886) and spoke with a very nice woman on the phone. While I was speaking with her I noticed that a silver screw was lodged within the "brush roll control" yellow selector switch. With some shaking it became dislodged and I was able to put the "brush roll control" into the hard floors setting and turn the "carpet height adjustment" all the way to the right, so that it was facing the word "low." I then followed the instructions for replacing the belt again.. (1) remove base plate (2) remove brush roll (3) place new belt around motor shaft and then around brush roll (4) insert left side of brush roll before right side (5) rotate brush roll to be sure belt is centered (6) replace base plate, making sure to insert under 4 little tabs before securing with screws.
It appears that it is very important that the carpet height and brush control adjustment are set to their highest point possible (hardwood setting) in order to get the brush to roll in a carpet setting.
"R" is the correct belt for the 4870 and should be correct for all other 4800 models.
Thank you for posting your problem to this website. If I hadn't seen that others were having trouble, I would have just given up. I hope this long post helps someone that was in my situation.