Question about Hoover U6437-900 / U6439-900 Windtunnel Bagged Upright Vacuum

2 Answers

Brush won't spin when position of handle changes

When we release the handle and let it fall all the way back, the vacuum brush rotates as normal. When we lift the handle to the normal vacuuming position, the brush stops rotating or rotates a little bit and then stops. There isn't as much rotational force when the handle is moved to the normal vacuuming position.

The clutch roller seems to move freely and is in the correct position when the handle is released.

We have replaced both belts already and that did not solve the problem.

Any thoughts?

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  • malboeuf Jan 27, 2008

    I tried a second belt (both are the same part number) and no go with the brush. The wheel is still on the tension arm and it moves freely. Is there a switch or some other activation device, other than the plastic piece that moves the tensioner arm, that allows the brush to rotate? I can feel something "click" when the handle is allowed to drop all the way back.


  • Anonymous Feb 04, 2008

    Domvac - I think I have the same problem. How do you access the accuator arm to repair it.

  • Rbrucec Feb 13, 2008

    I have the same problem. I replaced the belts, the brush roll rotates freely- no binding, but the brush roll stops at any carpet setting when it comes in contact with the carpet

  • jmdizon Feb 17, 2008

    I have the same problem except in my case it has a burnt smell. I have already replaced the 2 belts and still no go.  My vacumn cleaner is only 2 years old.

  • Anonymous Mar 01, 2008

    I have a different model U6474-900 and it has the same problem. I replaced both belts. Ours came with extra bags and belts so it should be the correct ones. The end bearings on the brush seem to spin ok. The tension pulley looks ok and appears to be functioning but even it I put additional tension on the belt by pulling up on the pulley with my finger I can easy rotate the brush with my hand. It looks to me that if the small belt was just a little shorter it would be ok. The little belt is 38528-034 both the one that came on the sweeper and the extra. But the model tag on the body of the sweeper has 38528-035 as the belt number.

  • malboeuf Apr 18, 2008

    The message from domvac on January 27 was the ultimate culprit for the problem. The brush roller "seemed" to rotate okay, but upon further review, it needed cleaning and lubrication. Seems that there was too much friction and the belts would slip a bit, then the rubber from the belts would leave deposits in the grooves making the belt slip even more. The total solution was to clean and lubricate the brush roller and clean the grooves for the belt. Thanks for the ideas

  • Anonymous Mar 20, 2014

    brush roller make noise

  • Anonymous Mar 20, 2014

    brush roll makes a loud noise when i go to vacuum.

  • Anonymous Mar 20, 2014

    roller brush makes loud noise when operating



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The belt for this machine is very specific and only one size fits. It is not uncommon for vac shops to sell the wrong belt because the proper belt is not available from normal supply houses, so they will substitute something they think will work.

Also, assuming you do have the right belt, check the tension arm that drops down on the v-belt when the handle is brought back. This arm has a wheel/bearing with a plastic "tire" or trim that rolls on the belt to tighten it. Sometimes, this tire cracks and falls off and then the remaining bearing won't have the necessary tension to tighten up the belt.

Posted on Jan 27, 2008

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  • Anonymous Jan 27, 2008

    There is a switch on the hood of the machine that will allow you to turn the roller off when used on bare floor surfaces. It is located next to the height adjustment, but I am assuming that you already know this. An important fact, You should only adjust this mechanism when the handle is in the upright position. If you attempt to change the position of this switch when the handle is back, the actuator arm on the underside of the knob will be damaged or even break off when the handle is returned to the upright position. I have seen this numerous times and in one case, the plastic piece that broke off fell down into the tensioner arm and would not allow it to fully engage the belt drive. This could be where your trouble is.

  • Anonymous Jan 27, 2008

    One other thing. I assume that you have checked the brush roll to make sure that it rotates freely. There is a bearing at either end of the roller that will get bound up with hair and dirt and these occasionally require cleaning and re-greasing. If the roller is in need of servicing, the belts will wear quickly and the roll will turn sluggishly if at all. The plastic caps on the ends will unscrew for bearing inspection. Pay particular attention to how the bearing is situated and replace in the same position.

  • Ngoshe8r Dec 16, 2010

    Try looking at the floor height adjustment as well, I just discovered that mine was not operating and causing the burnt smell, which is because the brush at its low cannot do carpet well.

    Flip the Vacuum over and the little set of wheels should get raised and lowered when you change the level on the head, if not this could be the issue. For me the wheels stayed in the same place and when i looked the part that was supposed to alter the level didnt even touch the other part.


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The vacuum cleaner is designed for the brush to rotate only when the handle is released for safety resons. I have two of these vacuums and they both operate this way.

Posted on Feb 17, 2008


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Please do this test & let me know results
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