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Question:

My vacuum cleaners' brush wont spin when on floor----spins when you take it off the floor, belt is not broken?

when you turn it on the brush should spin when you vacuum but it doesnt and when i pick the vacuum up it starts spinning..?

Answer:

Is there a switch to turn it to bare floor? If it has, check to see . Brushes won't turn it it's doing bare floors. Also Take out the Beater Bar, and check at the ends that insert into the roller part. There might be a lot of hair restricting it from turning. Take the roller assembly completely out and check the sockets on the sides. clean out any hair and thread or anything else. Before putting the thing back together, squeeze some dry graphite on any turning parts except where the belt goes. Rub a little bit of bar soap on the belt.(I doubt if you have any belt dressing) Bye
It very well may be the belt. If it has stretched, or was replaced with the wrong size, there isn't enough tension to keep the brush spinning under pressure.
Seems to me you should try to take the bottom off of the vacuum and see what is stuck. Maybe something wrapped around the motor. more than likely it's the beater brush that's stuck. Lift it out and take the ends off. They usually screw off like opening a jar. and clean underneath those pieces you just took off. The fact the the belts keep breaking is telling me that the MOTOR is running, that's what's breaking the belt. the belt is stuck because the brush is stuck, the motor however is turning thiis Still brush till the belt brakes. good luck to ya.
If your vacuum's belt is, in effect, a big black rubber band, then D S is absolutely correct, it is the belt. These things seem to be too short when they are being installed, but are made that way purposely so that there's enough friction against the motor pulley and the agitator to turn the brushes after they are in contact with the carpet. Over a period of time, usually, dependent on how much and how often you use the cleaner, the belt stretches out and loses it's tension on the motor pulley. The pulley is much smaller than the agitator and is usually very shiny and smooth, as opposed to the large wooden or plastic agitator. Actually, the belt is the only part on most cleaners that isn't covered by their warranty, because they are considered expendable. Get a couple new belts, install yourself if you're capable, and keep the second on hand for when the new one strectches out.
maybe you have it set too low to the floor. sometimes they have a height adjustment thing on them

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