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

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V-Belt Is contantly Worn

V Belt gets stretched after one use. Boggled.
I aslo need a detailed drawing of how to belt should be placed, in case I may have placed it incorrectly.

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  • John1269 Mar 07, 2008

    nvm Solved :-)

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If you still need a diagram of the unit please refer to our database at http://www3.sears.com. Have your model number handy as that is necessary to pull up your specific model. Parts and part numbers are also available through that website.

Posted on Mar 07, 2008

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The roller for my dyson does not turn and it does not pick up anything. Howevever, the hose suction is fine and I have checked all the places for dust blockages.


That means that the belt is stretched, worn or broken. You need to replace the belt. You can get replacement belts and view the manual with instructions here:

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Not picking up all fluff and other dirt


I don't know what type of vacuum you have but it could be that the belt is worn, stretched or broken. If that is the case then it won't pick up well. You can get replacement belts here:

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My roller bar wont spin the belt is on though


even though the belt is on and intact it still can be stretched and worn. If that is the case it won't be able to turn against the resistance of the carpet. Your particular model has (2) belts, a clutch belt and a drive belt. Both should be replaced yearly. You can get them here:

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1 Answer

Not picking up cleaned all of filters is there a belt for this


It might be because the belt is broken, stretched or worn. In all of these cases the vacuum won't pick up well. You can get the replacement belts for this model and download the manual which has instructions on how to change the belt here:

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The powerhead is weak, the brush turns until it is placed on carpet.


Empty the dirt collector. If there is insufficient air flow, the brushes will not spin.
-=/ Daft Tech /=-

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2 Answers

My Hoover U6439-900 also losing belts


When upside down there is no resistance,on carpet there is.
You need to try a a fresh, genuine hoover belt and buy a spare, belts stretch and slip after 30 -90 a days of normal use, often to 25-30% oversize Hoover belts generally fit very snug. If your belt looks shiny inside, that is likely the issue. Try that and post results

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1 Answer

Majestic filter queen vacums


Your belt is either stretched or the wrong size or the brush bushings are worn and allowing the brush to wobble or the motor is loose in its housing. You need to check all.
Rotate the brush and try to wobble it from the pulley end.
Flip the belt inside out, it if appears cupped, cracked or shiney and slips easily on and off the brush it is stretched. Generally this unit needs anew belt evrey 6 months, broken or not, they get hot and stretch. Do not buy a new belt by matching size, a worn belt can be 20-30% oversized and not broken but totally useless.
The motor shaft should be cleaned with W/D 600 grit sand paper. Motor should have no wobble in the shaft

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your belt has probably been stretched to the point where it will not work so good.

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Hoover mach 4 burning smell


There are two reason you could be smelling a burning smell-
1. The belt is too stretched out and needs to be replaced. This causes it to slip when the vacuum is on and will create that type smell. You can avoid stretching and having to replace the belt to often by releasing the belt after each vacuum.

2. There may be hair or other debris stuck around the rod that the belt is attached to. Can be avoided by checking after vacuuming.

Hope this helps

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Oreck belts keep coming off


If the pulley on the brush roll is worn, then I would replace the brushroll. Look at the ends where the brush roll sits in to make sure the casing hasn't over heated and not holding the brush in place. Also make sure the motor is shifting and causing the belt to come off. Another is if you are catching a rug or towel, that also will cause the belt to come off. I am assuming you using a new belt and not a worn one. After only a short time, belts stretch and need to be replaced.

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