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Kenmore 116.21514012 vacuum cleaner is extremely loud sometimes. If I pick the brush unit up away from the floor that is the tremendously loud sound it makes, but it's on the floor....
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Inspect the area around the brush roll. There may be something stuck somewhere in there. Remove the brush roll to see if the brush roll end caps will spin freely. If there is hair or debris restricting the brush roll may be causing noise.
could be the bearings on the end of brushbar need replacing,or it may be the clutch needs setting , lower the handle down to the floor then up again do this about three time to reset clutch....
these stick mmachines do not have a tremendous amout of suction at the best of times but if it has a full bag, or full dirt container, or dirty exhaust fiters it will take away from the air flow as well. take a flashlight and look up in to the tube of the floor attachment to see if you can see something blocking the tube.If there is no obstructions it may have a roller bar that spins on the bottom , so turn it over and turn it on and if it has a roller bar and it is not spinning it probably needs abelt . If there is no roller bar and no blo0ckage chances are it is just weak at the floor tool as the air a further to travel all the way up from the floor so it takes away from the air flow again. good luck.
If your brush roll is turning and your bag is not overly full, then the only other thing it can be is a clog where the bag connects to the vacuum. Turn the plastic part out away from vacuum and lift off to see if you have something clogging it. It would have to be something big, but not so big that it could not get past the fan. As a rule of thumb, KIRBY never clogs. I suspect that your belt is stretched out and your brush roll is not turning while on the carpet so the brush roll is just in the way rather than brushing your carpet to pick up dirt.
This is a telltale sign that your vacuum cleaner is clogged. When the motor makes the higher pitched louder noise, your motor is not able to pull air through it, and has to strain harder because it's not able to breath.
Because you have already narrowed it down, that the noise only happens when you put the wand back into the vacuum, this means that you clog is definitely in the bottom section of the vacuum cleaner. Most clogs on upright vacuum cleaner occur right at the suction port behind the roller brushes on the bottom of the machine. Turn the vacuum upside down so that the brushes are facing upwards. Unscrew the bottom plate of the machine so that you may access the roller brush and belt. Look behind the brush roller for the opening of the vacuum where the suction port it. Look inside here and see if you can visibly see anything lodged inside. Sometimes just pushing a long screw driver into this hole can dislodge the obstruction.
If you aren't able to see anything in this port, and the screw driver doesn't dislodge it, look inside the small section of how that the wand connects into, and try pushing your screw driver down this hose to see if you can dislodge it from this part.
Sometimes a metal hanger can also effectively unclog hoses on vacuum cleaners, but just be careful that the hanger doesn't tear the lower hose section while you're pushing it through.
Also if you have another vacuum in the home, using the hose from the other vacuum and putting it inside the lower hose, or the suction port behind the brushes while you're pushing with the screw driver will also many times dislodge the obstruction easier.
Please let me know if this was able to unclog the vacuum cleaner, and I'd be more then happy to try and do some more advanced diagnosing with you for your vacuum cleaner.
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Check the tube that leads down to the brush head for clogging as well as
any motor or HEPA filters. If that still shows nothing, take the cover
off the brush head (like you're changing the belt) and look for
obstructions in there. Usually, if you have low suction on the
accessory hose, the problem is with a motor filter, HEPA filter, or a
clog where the hose goes into the unit. If you have good suction on the
accessory hose but none on the floor, it's usually in the brush head
(clog or broken belt) Good luck
it may just be, that on carbet the brushes make noise that you dont hear on woodfloors.
If there is a hights adjustment, set it higher for shaggy carpet and lower for berber.
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