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Manual says to tilt the vacuum back so the front wheels are off the ground (unit turned off of course) and make the adjustment. May take some back-and-forth force, but should adjust. If not, then something is jamming the switch.
If the brush roller stalls when it comes into contact withthe carpet, it might be that the tensioner spring has broken off. This is adesign flaw in the Eureka4870. The symptoms are: 1) brush spins until it contacts the carpet then itstalls, 2) the brush lever for setting floor/carpet is loose and lacks a firmsetting, 3) vacuum no longer has the feel of being self-propelled on carpet. Itis not very easy to repair and I don't know if a replacement tensioner iscommercially available. To fix it yourself:
Remove the base plate by the 3 Phillips screws.
Remove the brush roller and belt.
Remove the black accordion hose connecting the motor housing to the clear vertical riser on the side of the vacuum. Unscrew it from the riser. Then disconnect the accordion hose from its black connector that screwed into the riser. Then unscrew the Torx T-20 screw that holds the bottom of the hose into the motor base. Then draw the accordion hose out through the underside of the vacuum.
From the underside, remove the 3 Torx T-20 screws that hold the red top cover in place. They are located between the brush roller and the two small height adjustment wheels. The middle screw holds the height adjustment knob. The other two straddle the height adjustment knob.
Turn the vacuum upright and remove the red plastic cover. This is the most difficult step. Use a flat screwdriver to pry it loose in the hole where the accordion hose fed through. On the other side, where the foot operated upright release lever is, you will have to pry the red cover off. I broke the red plastic loop from here. But it still reseats OK.
Still upright, remove the belt tensioner by the 5 Torx T-20 screws, including the one connecting to the slotted arm (it has a wide cylinder under the head). Before removing the piece, note that there appears to be another mounting hole like the four standard mounts. This is the anchor for the spring which applies tension to the tensioner. The other anchor point for the spring has probably broken off, and the spring might be dangling loosely or even missing.
Remove the tensioner unit. Locate the other anchor point, which is probably a broken tab with a hole as the anchor point, broken through from the high tension of the spring. This is the aformentioned design flaw.
Drill a new hole near the broken tab. I drilled two, at right angles to each other. Drill small holes so as to not weaken the remaining plastic. I drilled ~1 mm. Holes should be between the two anchor points so as to not make the spring stretch longer than the original. Plus, a longer anchor point will interfere with the butting of the plastic edge when in the stretched position. If the spring is already lost then use a replacement that is ~1 inch long (total length) with hooks at each end.
Reassemble the tensioner device. Check the operation of the tensioner lever to ensure smooth, firm locking.
Reassemble the red plastic cover (3 screws including the height adjustment knob).
Reassemble the accordion hose, brush roller, belt, and base plate.
It now works as good as it every did. I will next be seeking a replacement tensioner device from Eureka or a shop, since Isuspect this modification may eventually weaken and break. The plastic springanchor points are definitely a poor design by Eureka.
That spring connects to a slot beside the height adjuster knob and a hole in the base to the wheels that fell off.The problem is you can't get the wheels to go back in flush so the height adjustment works.The vacuum will not be close enough to the floor to get any type up suction or brush contact.To change that spring as well as the belt,remove the cover by taking out two screws,one on each side.Force the rller out by prying the right end out of the slot.
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 problem here is the height adjustment has disengaged from its action below the hood of the vac, leaving the vac in it's lowest position. This does not allow any "AIR FLOW" under the head so it just draws down into the carpet You need to remove the adjustment knob and the hood as though changing the belt and then reassemble with these components aligned to each other. Also check your belt for slippage while inside..
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.