Question about Hoover U6434-900 Bagged Upright Vacuum

2 Answers

Belt Keeps slipping off shaft

I replaced the main drive belt when it slipped over the end of the motor shaft, but problem still persists.  Is there a part that fits on the end of the shaft or is there a way to stop the belt from coming of the end of the motor shaft?
Thanks.  Mark

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  • markfjy Oct 03, 2008

    I checked for looseness of pulley and trueness of shaft.  I agree, something must be causing this to skew.  Usually, the belt slips off when the power drive is engaged - that is to say the assist mechanism to help move the vacuum forward and backward.  So the brushes turn, the vacuum collects, but the forward and backward assistance mechanism is at the root of the problem.  So If you attach the belt, turn the vacuum on its side or upside down, the belt tracks true.  As soon as you engage the forward or backward assistance is when the belt usually slips off the shaft.  There is a lot of play on the lower vacuum head, if you will, and it does flex by design, but the entire unit flexes as a whole, not any of the individual parts, such as the drive wheels.  There must be some motion somewhere, I agree, that ever so slightly causes the motor shaft to untrue itself, but I have not found any play or looseness of individual components that would suggest that.

  • smiles9320 Nov 29, 2008

    I am having the same problem; the belt broke and I put on a new one. Now, the new one keeps slipping off. It come off right away and it just slides off the silver rod (excuse my ignorance). What can I do to fix it myself?



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If this is a new belt that keeps coming off, then if not catching something in the roller like a scatter rug, etc then the belt isn't tracking true. The pulley may have come loose for one thing, something has to be off to have the belt come off. Does it come off almost right away, or after some uasge?

Posted on Oct 03, 2008

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The belt started to slip off the main drive belt to my U6420-900 this morning, and after reinstalling it a couple of times, it came off again. I tried a new one, but after approximately 7 minutes of operation, it also slipped off. After I read your similar problem with no solution, I started to check the alignment of the wheels, the roller, etc. then I noticed that the belts after a certain amount of use, they stretch, and become loose, I compared it to a new one and found a difference in size.
My solution was very simple. I took the old belt and cut off a piece of approximately ¼ inch, and then I reattached the ends by using industrial glue (Ethyl Cyanoacrylate). After approximately half an hour I finished vacuuming my entire house the vacuum cleaner is still working.

Posted on Apr 10, 2009


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