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

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The small belt attached to the roll brush keeps slipping off. It's a brand new belt and the vacuum is only 1 yr old.

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The small belt rarely gives the problem you describe. The larger belt can jump off if the belt is worn or if th roller gets caught on something suddenly.The belt should be replaced every 9 - 12 months. If your carpet setting is too low this will cause the belts to wear faster that the estimated given time

Posted on Oct 11, 2009

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1 Answer

Brush not turning and there is a smell


Your belt has most likely burned in half, this happens from an object getting caught in the brush roll, a brush roll that does not shin freely i.e. debris under the end caps or usually and old stretched out belt that has been slipping; belts can stretch out in 6 months whether you use the vacuum or not.
Remove the brush roll and old belt, inspect for damage, clean out the area and instal an new belt or the same brand and type. It should be good as new.

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Those machines have the belts on them at production.
You can read about this
www.vacuummedic.com/blog/2012/10/09/my-brand-new-vacuum-doesnt-work/

Change the belt! Good as New!

Good Luck
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1 Answer

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Be sure to unplug your vacuum from the electrical outlet before proceeding!

-Turn your vacuum upside down so that the handle is resting on the floor and nozzle portion is resting on a work bench.
-Remove the 2 phillips screws from the metal bottom plate and set the bottom plate aside.
-Look at the right side of the brush roll. You will see a bent metal rod that attaches to the brush roll end cap. This is the clutch rod that allows your brush roll to spin or not depending on the position of the carpet/floor switch on the top of the nozzle. Pull this rod out of the brush roll clutch only. Leave the switch end of the rod where it is and just let the rod rest there.
-Pull the brush roll and old belt out and dispose of the old belt.
To install a new belt; put the new belt on the motor shaft first, next put the other end of the belt over the end of the brush roll and stretch belt and brush roll back in to place. Notice that on the brush roll end cap opposite of where the clutch rod goes, there is a metal piece with a slot cut into it. Be sure that this slot mates with the plastic stop in the nozzle so that the end cap cannot move.
Snap the clutch rod back in place and rotate the brush roll by hand to make sure the belt is not pinched.
Replace the bottom plate.

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1 Answer

Belt won't stay on


A belt will slip off because it is stretched, or the brush bearings are worn, or the motor drive shaft is misaligned.
Hoover belts fit snug.
After as little as week they begin to stretch. Even though they are not broken, they will spin loose. IF you can stop the brush with little effort and the belt keeps moving the belt is stretched. Do not buy a belt buy size, buy it by model. But 2 and store your spare under the hood of the vac if possible.For best cleaning results,change every 3-4 months if you vacuum weekly. 6 months at most.
Most times your old belt will be stretched as much as 30% oversize. If it looks shiny inside it has likely been slipping.
Before reinstalling check that your brush rolls freely and clean the bearings at the end of the brush roll.. Once reinstalled check it again before turning on the vac.

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Remove the glide plate at the bottom of rhe machine. Remove brush and broken belt. Fit new belt and re install brush. Fit glide plate, job done.
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1 Answer

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You could try contacting Hoover for parts availability. If it's and older WindTunnel and Hoover no longer has the part, try eBay.

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1 Answer

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There should be a belt tensioner for the V belt, maybe it is not contacting the belt when you tilt the handle back. If this is less then 1 year old, then it is under warranty, take it in to a warranty servicer for warranty repair.

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You may have a bad brush roll, part #61250-1, or the base itself has a problem and isn't letting the brush roll sit straight so it can be in alignment.

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1 Answer

Owners manual


remove bottom plate, remove brush roll. slip new belt over motor shaft then onto brush roll. refit brush roll and bottom plate. its just meccano

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