Question about Hoover U6630-900 WindTunnel Bagless Upright Vacuum

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Hoover self-propelled windtunnel belt pops off

The drive belt comes off the stainless steel end only on my self-propelled Hoover Windtunnel vac.  I have installed a new belt  - and it is the correct one - but it still pops off periodically.  There is no pattern - sometimes it pops off when I pump something or after I have picked it up and moved it.  Then sometimes I can do those same things and it stays on.  The vac is running beautifully otherwise.  My husband can fix most things, but finds no reason for the belt to pop off.  His last idea was that the motor is shifting slightly, but there is no sign of that.  Any suggestions would be helpful.

Thanks,

Kim

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  • Konehead Nov 06, 2007

    The self propelled drive belt comes off of the large pulley every time I use my vacuum. The problem is the shape of the pulley is convex which causes the belt to slip off. I have e-mailed Hoover several times about this design flaw with no satisfaction. My last e-mail threatens a class action law suit involving all Hoover owners that are experiencing this same design problem.

    Hoovers only reply to me so far is that this is a performance problem with the vacuum, which is incorrect. It performs fine until the drive belt slips off of the pulley.

  • Anonymous Jan 08, 2008

    Yes we are having the same problem. I can't even get one room vacuumed befor it slips off. I have had this self-propelled Windtunnel bagless a little over one year. I had one before and it was great. This one has been a real pain. We have even tried a new belt with no luck. Help!!!!!



    Sandra Foster

    Longview, TX 75604

  • Joyce Camper Jan 09, 2008

    Hi from Montana,

    I have the same problem. I spend more time putting the belt on than I ever spend vacuuming. Several people have told me they were getting ready to buy a new vacuum and I let them know to stay away from this model.

    Not only I tell them about the belt problem but that I would not buy a bagless model ever again.

  • Joyce Camper Jan 09, 2008

    Yes, I spend more time taking the bottom off and putting the belt back on, then actually vacuuming. I hope I can get at least one room done or even a row before the belt comes off. One repair man thought the problem was the belt strechedout after a couple of uses but even putting on new belts do not solve the problem. Anyway, several people have asked me about buying a Hoover windtunnel and I tell them if they would be better with a bag type that is not a Hoover.

  • Joyce Camper Jan 09, 2008

    I spend more time taking the bottom cover off and putting belt back on then ever cleaning. One repair man said to try putting on new belts but that never worked. I have told several people not to buy a bag-less Hoover if they ever want to get their floors cleaned.

  • In Wyoming May 11, 2008

    I found the answer to the belt popping off. It's the belt. I put a new belt on and it popped off over and over again. I decided to try another belt and I have been running that same belt for a cleaning job for 5 months!!! So if you have a belt pop off, pitch it and try another one.

  • johnnyfixya Nov 29, 2008

    Same problem here; We have a self propelled Hoover windtunnel, and the belt pops off every 30-60 seconds and we have to keep putting it back on! We have had it for 5 months but it only started doing this last week. I suspect the belt has just loosened slightly over the course of the past 5 months and every time I have to stretch it to put it back on, it gets a bit looser, making it come off easier and easier. So frustrating!

  • Anonymous Feb 15, 2009

    We have the same probelem. It worked great for the first year. Now almost every 30 - 60 second the belt pops off. We tried cleaning it, replacing the belt, everything. We're going to try to take it to a local repair shop and see if they think the shaft and pulley are not alighned properly of it is something else.

  • rob in ill Apr 08, 2009

    Same problem here as well. I tried replacing the belt but the new one still comes off. I did notice when replaceing the belt that the stainless steel rod is quite warm, almost hot. It makes me wonder if there is friction that is causing the belt slippage. Either way, it's clearly a design flaw. A pity because the vacuum works find otherwise.

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The correct belt is a 38528035. If the belt does not have this number printed on it, it is a generic belt and probably the wrong one. The pulley on the transmission is "convex" because this pulley design keeps the belt running in the middle. (a belt will always try to "climb up a hill") If the motor shaft and the pulley are not aligned properly, the belt will constantly throw off. This can be a result of a bad motor mount (located inside the motor compartment.) The motor shaft end has a rubber cover that absorbs vibration and keeps the motor positioned squarely. The handle could also be loose on the pivot. It is held down by two metal clamps that screw securely to the bottom, holding the handle on to the base and allowing for the handle to pivot backwards. This problem can be difficult to diagnose and I have had many in my shop for repair. It takes a seasoned and experienced repairman to find a solution to this problem, in most cases. The disadvantage I have here is that I cannot see your machines to inspect all the various things that effect the belt alignment. I hope that some of this information will help.

Posted on Jan 20, 2008

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Same problem of belt coming off metal shaft. Before giving up on vac decided to dig a little deeper. Removed the outer cover then the two little wheel assembly by bending the plastic catch back then popping out. Removed 4 screws holding the shaft with the black wheel that the two belts ride on. Quickly realized the nut that holds on the black wheel was missing. The guide wheel didn't fall off because it had no room to fall off the end. If the black wheel seems to rock around the bolt is possibly loose or missing. Realized the bolt is left handed threads. When I checked my indoor mini tool box amazingly here was one left handed extremely rare 1/4 nut that I must of found on the floor and saved. Runs like new now. To prevent the nut from rattling off again put some 2 part epoxy on the end of the nut/bolt. Lock tite, pvc cement, may also work. The nut seats into plastic so a lock washer is a waste. For my vac, the problem has seemed to get worse over time so I suspect the nut was slowly working its way off the long shaft. The design flaw is not putting lock tite at the factory or maybe the locktite degraded with the heat. Best solution would be a second left handed nut to lock them together. The threaded shaft is plenty long enough. Something to check if your belt is falling off.......

Posted on Jul 12, 2009

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JUNK -- We have a Hoover U6634-900 JUNK -- now out of warranty which the BELT FALLS OFF !!!

Research has shown its JUNK.

Ours has very little use and the construction and design is poor.

DON'T BUY HOOVER -- THEY DO NOT RESPOND TO QUESTIONS !!!

Posted on May 11, 2008

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This is ridiculous. I have had this vacuum for less than 2 months and the belt pops off every few minutes. I tried calling the number on the machine, but it is not in service. Can anyone please help me. I spend more time replacing the belt than vacuuming. Wish i knew this before I bought it - and worst of it is that Hoover doesnt seem to give a damn!

Posted on Dec 04, 2010

  • Fordeaux Apr 08, 2011

    Do not try this, because it's dangerous and stupid. Just because it works doesn't mean you should do it....

    Put new belt on. Repeated rolled off as soon as vacuum powered up. Tried all the tips I could find.

    Ended up putting vacuum in "hard floor" mode to disengage brushes then held a screwdriver along edge of belt. Powered up machine and used shaft of screwdriver to "train" the belt to stay in place. One belt was "hot" it re-shaped itself while held into correct position and seems to be staying on just fine

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I had the same problem with my wind tunnel. After watching how it occurs I came to the conclusion that as soon as some strain was put on the beater bar, and sometimes this even stopped altogether for a moment on mine, then the belt slipped off. I removed the belt and beater bar and found that the belt looks like it has stretched a bit and had a groove in it from the shape on the drive spindle and the beater bar. I also noticed that the beater bar was quite shiny. I used some rubbing alcohol on the belt to remove some of the debris on it and then used a sanding block on the drive part of the beater bar. I reassembled it and put it through it's paces and it now seems fine (haven't ran it for a long test yet, but time will tell). I will replace the belt as soon as I get a new one but I can see how this will not automatically fix all situations if the belt on the beater bar still slips, thus it needs to be sanded. Dave

Posted on Jan 19, 2009

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Hi, I have a Hoover self-propelled windtunnel
and have had problems with the drive belt popping off frequently. Frustrating!! I solved the problem by changing both belts at the same time. Get a new the wider drive belt and thinner belt that drives the brush change at the same time. This solved my problem of the wider belt popping off....2 months so far... no pop off...
Ron

Posted on Jan 23, 2011

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Same problem, belt keeps popping off after a few minutes of use.
Took machine apart and determined the motor shaft was too short.
I added a piece of metal tubing over the drive shaft ( found that a flux brush tube fit perfectly over the motor shaft) cut it a little longer than the shaft, it has been working fine ever since.

Posted on Sep 12, 2019

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