Usually you will find a brush assembly which includes the bearings. You could also be hearing the belt jumping across the brush gear if the belt is bad. If you order the parts online, you may want to get a brush and belt, since a belt won't be that much more money anyway. Aftermarket Aerus (formerly Electrolux) parts can be suspect sometimes, so I would suggest finding a dealer. You can go to their website to find the closest store. aerusonline.com Good Luck!!
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Probably either bearings in the roller brush, a damaged fan blade, or the bearings in the motor. Take the roller brush off completely, and run the VAC without it. If it's much more silent, then the problem is with the bearings in the roller brush. If it's still noisy, then look closely at the fan that produces the suction, if you can. If you see any damaged blades, then you'll have to replace it. If it seems fine, then it's most likely bearings in the main motor that will have to be replaced. The bearings and the fan blade are NOT expensive parts, but the labor at a shop to change the main bearings would be kinda pricey.
You will need to unplug the vacuum from the wall, lay it down so you can see the bottom of the vacuum head and remove the bottom plate (foot plate) Probably philllips head screws. pull up on the roller (called the beater bar). The beater bar will come straight up. Disconnect the belt and check the fittings at the ends of the beater bar... I'll bet that they don't spin easily (The fittings have roller bearings in them, and the roller bearings get gunked up with hair, carpet fibers and dirt). Pull the end fittings off of the roller and remove all of the hair and carpet fibers off of the end of the beater bar and the fittings and out of the bearings. Check to make sure that the roller bearings spin freely. If they do not spin freely, put some rubbing alcohol in the bearing (you can pour it onto the bearing and spin the bearing manually until it spins freely, or you can use a spray bottle with alcohol in it as I do. Once the bearing spin freely, dry them out so no alcohol remains in the bearing, then a drop or two of light machine oil (3 in 1 oil will do) in each bearing and spin the bearing again to distribute the oil. Now would be a good time to check for any clogs in the vacuum head where the hose connects, and check the hose for clogs. Reassemble the beater bar and reinstall it in the vacuum with a new belt, reinstall the foot plate.
Remove the bottom cover of the sweeper head, then remove the brush roller along with the belt if still there. Clean the brush end-bearings--the roller ends and the interior of the bushings. Then oil the bearings lightly with 3-1 oil or similar. Place the new belt over the roller and the motor shaft adding any required belt twist (diagram on the casting), then seat the roller and bearings as a unit. Replace the cover and test the roller for running. Hope this helps!
Your drive belt is probably streched and slipping on the motor shaft. However your bearings on the roller brush may be worn out.
Take roller brush out of power head and check the bearings at each end. If they are siezed buy a new brush.CHeck to see that your brush housing is not damaged due to heat caused by siezed bearings
Remove the roller from the head and check the end bearings for binding (note how the belt is attached). Remove all of the wound up thread, hair, and string from the entire roller. Clean the bearings and lightly oil with 3in1 or similar. Check the belt for worn or burned areas (replace if so). Belt should be tight when reassembled. Clean the air passages of any potential clogs. Make sure all of the wheels turn freely--if any problems, remove the same debris from the bearings and lightly oil. Wipe away any excess oil. Hope this helps.
It's possible it has some loose or rusted bearings at the end of the bar. If so, the bearing assembly needs to be replaced. This could account for one end being loose, as well. You can try oiling it with a fine grade oil, like that made for sewing machines.
It's also difficult to get all the dirt, sand, or grit out of the bearings unless you take the assembly out, and use a strong powered air sprayer made for doing it.
A worn or broken end nipple will also cause a loose bar, and the bar and receptacle for it will also need replaced.
It sounds like you have a roller problem. This machine has a carbon fibre roller suspended on plastic end caps. When dirt and hair etc. gets in and damage the bearings, the belt will be the first thing to go. If the roller is noisy, that indicates that it is off centre and is rotating unevenly. You will probably have to replace the roller.
Take the belt off and rotate the roller slowly and observe the ends. If it is off balance, it will not rotate evenly. The plastic caps unscrew to reveal the brngs and usually you will find hair and other junk gumming up the works. If the roller is damaged, you will be able to see melted plastic and chards of carbon fibre there.
The newer models have plastic end caps that will melt when the bearing heats up. This will cause the cap to go "off-centre" and the roller will vibrate badly. If this is the case, you will have to replace the roller.
If the belt is a geared drive, check the belt for any missing teeth.
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