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New Eureka vacuum cleaner belt keeps slipping off

I need to replace the belt (part 61110a) on my Eureka 4870 series vacuum cleaner.  The new one is *very* tight when I install it and after a minute or two of vacuuming, it slips off.  I have replaced the belt twice, yet each belt slips off. Only the original very-worn belt seems to work.  
I manually turned the roller and can see that the belt wants to wander off of the roller, but I cannot see any apparent reason why it does that.  Any suggestions as to what I might do to keep it on?
Thank you.

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Re: New Eureka vacuum cleaner belt keeps slipping off

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.

Posted on Jan 15, 2008

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4870 roller part number

I know the belt number
Eureka Part Number: 61110B (Replaces 61110, 61110A)
And the roller i think: Genuine Eureka Brush roller part number 61250-3 for Eureka The Boss/Smart vac/smartvac ultra 4800 series vacuums including models 4870 and 4880
Hope this helps you.

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2 Answers

My Eureka The boss Smartvac Model #4870 roller brush won't turn even on the highest setting and the belt smells hot. we took the belt off. How can you tell if it needs replaced?

Just by what you explained I can tell that it needs to be replaced. The belt doesn't have to be broken to need replacing, if it is stretched and worn then it will slip on the motor shaft and not turn the brush roll and get hot. Here is a link to the belts you need and the manual which has instructions:

Bissell 4870 Belts

Owner's Guide (3,666K download)

Dec 11, 2009 | Eureka Smartvac 4870 Bagged Upright Vacuum

1 Answer

Brush roller spins until it touches the carpet, then stops.

That means that the belt is stretched or worn. Here is a link to the replacement belts you need and a manual which has instructions:

Eureka Smartvac 4870 Belts

Owner's Guide (3,666K download)

Dec 06, 2009 | Eureka Smartvac 4870 Bagged Upright Vacuum

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Eureka 4870 roller only spins in upright

if the belt has been slipping it may have pollished the moteror brush shaft and it just slips. take a small piece of sand paper or enery cloth and ruffen up the shaft to give it some grip.
if the metal shaft of the motor has been heated up due to slippage it will take some doing to ruffun it as the shaft will be hardend due to heat

Mar 28, 2009 | Eureka Smartvac 4870 Bagged Upright Vacuum

1 Answer

Belt on motor roller

no only take the bottom off ,there will be three screws,take the belt put in over the shaft of the motor , loop it ,run it over the silver spindle to the brush assembly ,replace the brush in the slot that it came from,the belt now is over the motor shaft running over the spindle ,and over the brush assembly,replace the three screws and you should be good to go.

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Euerka Smart Boss upright

Price of Belt: $ 7.49 from
Part No. 61110A

Price of Bag: $7.99 for a pack of 3.
Part No. 61115A or Eureka Bag Type RR

Estimated Repair Cost: $75-90 pending parts and labor rates

The likely possibility is that the belt was installed wrong. Without seeing the unit myself, I cannot say if the pulleys are mis-aligned. I will get back to you if I find any new information.

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