g seems to be wrong, but I notice that the pin that engages the belt seems to vibrate a bit, possibly creating the noise. It started when I accidentally got part of a plastic grocery bag caught in the brush. Could it have stretched a belt? Nothing is caught any other place and it only makes the noise when the brush in in the on position.
Hoover U5780-900 Windtunnel Cyclonic Bagless UprightVacuum

How to Identify and Fix Common Vacuum Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced Vacuum Technicians :

Worn out bearings on the brush roll will make a vacuum much noisier. This is a good time to check them after cleaning and inspecting the brush roll. Try spinning each bearing by hand. Some brush rolls have only one bearing on the roll, and the other bearing is in the head where the roll is mounted.
Grinding noises are often caused by bits of debris getting lodged behind the brushes or into the cleaning head, especially large bits like dry pet food. This will clatter around or jam the brushes to create the noise you`re hearing. A thorough cleaning should put everything right.
If the cleaner becomes noisy or starts vibrating, it may be because some debris has got tangled around the brush roll or agitator situated in the bottom of the cleaner.
If your machine is making an abnormally loud noise it is likely due to the belt slipping or the brush roll being incorrectly installed, follow these steps to resolve: Turn off and unplug machine. Use a Phllips-head screwdriver to remove 3 screws, 2 in the belt cover and 1 on the brush roll mount. Remove belt cover.
Blockage – when a vacuum cleaner becomes unusually loud, it is normally because of a blockage of some sort. This is a problem that is easily solved by turning off the cleaner, check for blockages in the pipes, and remove them. You can also check and empty the canister to remove any possible blockages there as well.
Sound enclosures, noise reduction blankets, sound curtain noise barriers, or sound barrier walls are a few options to consider when reviewing noise reduction materials. If the vacuum pump is indoors, a noise enclosure would be the recommended solution.
Possible cause. During vacuum cleaning, especially in rooms with low air humidity, your vacuum cleaner builds up static electricity. As a result you can experience electric shocks when you touch the tube or other steel parts of your vacuum cleaner. These shocks are not harmful to you and do not damage the appliance.
On average, a well-maintained robotic vacuum cleaner can last up to 4-6 years, but some models may last even longer.
If all you hear from the vacuum unit is a click at the when you try to start the vacuum motor from inside the house, then the motor in the unit is dead and has to be replaced. A strong odor from the shellac, which coats the copper coil windings, is an indicator that the motor is about to or has burnt out.
This means it is best to choose a vacuum cleaner with a noise output that is less than 70 dB. However, the noise levels of vacuum cleaners fall between 75dB to 85dB. Thus, continuous exposure to such noise levels affect a user`s health while also being a sign and source of inefficiencies in the equipment.
There`s a reason your vacuum, car, potato chips, are way louder than they need to be. Surprisingly it`s done on purpose. Engineers and designers manipulate the auditory element of products. Some of the biggest culprits are vacuums and cars.
The biggest cause of carpet becoming crunchy and gross is simply that they were not cleaned properly. If your carpet is crunchy after getting cleaned, that means that particles of the shampoo, detergent, or chemicals that were used during the cleaning process were left behind in the carpet fibers.
If you`re smelling rubber, the belt has either burned out and snapped or the belt has become so stretched out that the roller is not moving and the vacuum belt is getting super heated from the motors RPM.
Hissing or Sucking Noises

Usually, when the leak isn`t too bad, you will hear hissing noises coming from the engine. This may also sound like whining sounds or whimpering sounds. For more severe vacuum leaks, the noise is sucking or suction, much like a vacuum cleaner.

On average a brushroll should be replaced every year or two. If you`re not sure if the vacuum is working as good as it could or should be, replacing the brushroll can be an easy fix .
Brushes. According to iRobot, brushes should be replaced every 6-12 months. Robot vacuums like the iRobot Roomba j7+ have multiple brushes that allow it to clean.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

When I vacuum w/ the brush control in the on position it make a really loud noise, almost like a grinding sound. I have looked at it and nothing seems to be wrong, but I notice that the pin that engages the belt seems to vibrate a bit, possibly creating the noise. It started when I accidentally got part of a plastic grocery bag caught in the brush. Could it have stretched a belt? Nothing is caught any other place and it only makes the noise when the brush in in the on position.
ANSWER : Yes, the belt could have been stretched and is now vibrating and hitting other parts and creating a noise if much of the bag got caught under the belt. If you have another belt for this vacuum, please put it on and see if the noise stops. If it does, then problem solved, if not let me know and we can try something else and you can send a picture or video to me of the problem.

Let me know how this works out for you.

Benjamin

Hoover WindTunnel Self-Propelled V Belt
ANSWER : I had this same problem with the V belt on my Hoover Vaccuum..
.There are three (3) basic things that will cause the brush roll not to spin..
.1. When handle is upright, brush roll is OFF..2. When switch is set for HARD surface, brush roll is OFF..3. Broken/worn FLAT belt or V Belt, brush roll will not spin.
.
.I noticed that the brush roll was not spinning when my vacuum was set for CARPET. After removing the cover I noticed that the V belt was loose, I thought the belt was worn so I purchased a correct replacement belt and installed it, but the new belt was also loose and when I turned the large flat belt pulley it did not turn the V belt pulley at the same time..
.I double checked the surface setting and I had the vacuum switch set for carpet, but still when I released the handle out of the upright position the brush roll would still not spin..
.My aggravation finally led me to this posting on FixYa’s website..
.The first thing I did was checked the screw to the left of the V belt as suggested by ejmjr5 and this did nothing to solve the problem or create more tension on the V belt, even when the upright handle was not in the upright position..
.After playing around with the surface setting control switch/nob I notice that when I moved the switch out of the HARD surface setting and over to CARPET, I had thought that the switch was set for CARPET as it visually appeared, but I was not pushing the switch over hard enough to click it into the CARPET setting mode..
.VOILA, the brush roll now spins correctly even though the V belt seams to be too loose for the pulley..
.You really have to force the switch into the CARPET setting. Be sure that you hear the switch/nob click into place..
.Now you can effectively clean up after that hangover of a party!.
.Burp!

Hoover Wind Tunnel 7500 Brush not Turning. I have replaced the Brush and the belt. The problem does not seem to be either to me. I believe might be a missing part. The place were the belt hooks on is a metal pole which never seems to grip the belt well. In fact it seems loose most of the time and slips on the brush, causing the belt to eventually burn up. Could there be a missing plastic or rubber piece meant to hold the belt taught  on the metal pole?
ANSWER : Check the Idler Pulley part Number 43241004 (Item 13 in the IPB)

http://64.49.205.183/v/u6451900.pdf

I replaced the belt on my Dirt Devil Featherlite Bagless Vacuum and the brush roller rubs and makes a very loud noise when turned on. I have gone exactly by the manual instructions and made sure the belt and end caps were on correctly, but the bristles still rub the back and it makes a very loud noise. Without the brush roller in the vacuum, it sounds and runs normal. What could the problem be?
ANSWER : Http://www.geeksquad.fixya.com/ThreadView.aspx?prdid=0&thid=561283
.Generic problem for all Vacuums
.I replaced the belt on
.Posted by piggytail on May 01, 2008
.I replaced the belt on my Dirt Devil Featherlite Bagless Vacuum and the brush roller rubs and makes a very loud noise when turned on. I have gone exactly by the manual instructions and made sure the belt and end caps were on correctly, but the bristles still rub the back and it makes a very loud noise. Without the brush roller in the vacuum, it sounds and runs normal. What could the problem be?
.
.Hello,
.I would advise you to ALWAYS to FIRST UNPLUG YOUR VACUUM before beginning any service procedure.
.The Royal Dirt Devil Featherlite Bagless Vacuum has just bushings in the ends of the brushroll and not bearings and once the bushings are bad I suggest that you replace the brushroll in the vacuum and put a new belt on the vacuum as well. There is no way to repair the bushing s in order to it to work properly. The suggested belt change is every 4 to 6 months and to store the extra belts in a Ziploc bag in the refrigerator to keep them fresh. Suggest looking at a local vac dealer. So if you need further assistance, please feel free to contact your local vacuum cleaner dealer in your area or in the yellow pages, or contact the factory phone number or website to further assist you with your questions.
.http://www.royalvacuums.com
.Customer Service
.For help with a model that is not working, if you want to check an order, if you need help finding a part or service center or have any other comment, complaint or question that is not a technical question about this web site use the link above. You can also call our Customer Service department between 8AM and 7PM EST Monday through Friday at (800) 321-1134.
.www.A-1Vacuum.com 1-800-657-1874 If you cannot find a local dealer near you they can ship you the parts UPS.
.Don – The Vac Man
.Go Ahead. Use Us.
.

Loud noise I have a brand new Dyson and it is great on all my floors except one of my area rugs when it starts making this really loud vibrating noise. I am not sure why – nothing is stuck in the roller or vacuum and it doesn’t make it on any of my other rugs. Also it is really hard to push whereas all the other floors it just glides. I don’t want to return it but I also don’t want to hear this sound every time I vacuum.
ANSWER : This is the clutch as it jams up in the brush. Usually happens with rugs that are not secured to the floor.

Dirt devil vacuum cleaner–trouble vacuuming dirt and pet hair on carpeting –is the problem with the spinning brush which contacts the floor,  not contacting the carpeting??  I thought (when I bought this vacuum) that the aforementioned brush was adjustable to various heights of carpeting.  Sometimes, it seems like nothing is being vacuumed up –unless I have just put a new bag on the vacuum… Do I need or can I replace the spinning brush on the bottom of the vacuum so it kicks up and vacuums
ANSWER : Try replacing the belt. Rubber belts stretch out after about a year.

Noise My Dyson DC08 is making a loud, rough, vibration/noise that seems to be coming from the from the rotating brush housing. I replaced the old belt which was several years old and slipping. When I run the motor with the new belt removed the machine sounds normal. The bearings on the rotating brush seem to be running smoothly when turned by hand both when out of the brush holder and when installed in the machine. I can’t find anything rubbing on the belt or rotating brush. I applied a bit o
ANSWER : Hi there, it’s Jack at Dyson.
.I’m sorry to hear you’re having difficulty with your Dyson vacuum. From your .description, it sounds like the model number you’ve supplied may not be correct, .as DC08 is a cylinder vacuum which doesn’t use a belt-driven brush bar. So we .can confirm exactly which model you own and take you through some quick .diagnostic checks, I’d encourage you to contact us directly. You can reach our .experts by calling 0800 298 0298 (UK), or 1-866-693-9766 .(US).
.We’ll .look forward to hearing from you.
.Best .wishes,
.Jack .- Dyson Official Online Customer Surpport
.http://www.dyson.com

My vacuum is making a loud whirring sound and is hotter than normal.
ANSWER : Hi Kelsey! I understand how frustrating this must be. Dirty filters or a clog can cause the vacuum to change sound and be hotter than normal.

Here is a quick link to troubleshooting the excessive noise:.

http://www.bissell.com/FAQDetail.aspx?id=1362&cid=ccsocial