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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.
By the "main part", it sounds like you may be referring to the electric power nozzle? Look down the stem or neck of the nozzle as it may be plugged. You should be able to see from the opening of the neck through to the brush roll (just slightly). Be careful should you decide to disassemble the nozzle. Some of the newer nozzles can be easily destroyed by over tightening the screws.
When cleaning the machine, did you do a good job of cleaning the beater brush and making sure it turned freely in the holders on each end? Perhaps a bit of WD40?
Also, a new set of belts might help a bit.
I went to my local Sears store and the salesman there looked at my vacuum and was able to resolve the issue. There was a piece of wire that had been sucked into the machine that then blocked anything else from being vacuumed up.
It sounds like you have bad carbon brushes on the motor. Get replacement brushes from a local vac shop, and take the unit apart. On each side of the motor their is a retangular piece of plastic with what looks like magnets in them. In most cases they are simply held by 2 screws. Replace these brushes and reasemble the unit. If the problem persists you have burned out the comutator on the motor and the whole thing must be replaced.
if its a canister model there probably is no belt just suction.open the canister and if it has a bag feel the bag ,if it feels kind of hard then the bag is full.take the tool off the end of the hose and turn it on to see if you have suction if you do then the tool is blocked up.take it to the sink and run some warm water through it and maybe use a little brush to clear out the dirt.full bag will cause your vacuum not to have suction or not as much as it should
I had a similar problem with mine. When you take the collector container out, if you reach your hand up, you will fill a round, plastic piece. Gently turn it and the piece pulls out. On the outside of the piece is a foam filter that may be plugged. There is another filter underneath the collection container in a pull-out drawer. Both filters can be washed with cool water, allowed to dry totally, then replaced. I understand that both of these filters need to be washed "frequently". It worked for me, hope it works for you.
I had the same problem with my vacuum. I called in for technical service and was told to push the "reset button". It turns out that there is a small red button right next to the dirt indicator light. I pushed the button, plugged the vacuum back in and started it up and it worked like a charm! :) Hope this helps!