Beater roller makes lot of noise replaced belt and cleaned

SOURCE: The beater bar makes a horrible clunking noise when I turn it on

I just came from the repair shop. There is a recurring problem with a bearing coming out. Repair guy turned it on & said that loud noise is a symptom of that exact problem. This is a warranty item, as is the belt & on/off switch. Dyson comes with a 5 year warranty, so call their 800 number to get the name & address of an authorized repair shop.

SOURCE: My Bissell Cleanview Bagless vacuum makes loud grinding noise.

the ends of the roller have something wrapped around them.see if you can pull the ends off so you clean the caps and bearings

SOURCE: I have a Dyson Animal. Roller bar won't turn/belt intact

Actually, I'm the poster who said I have the same problem, but it turns out I have the DC07 animal, not the DC14, but perhaps the solution is the same for the DC14 and it doesn't cost anything! I called DYSON and they told me the clutch needed to be reset, so she had me recline the vacuum from its upright position, lay it on it's side, turn the carpet/bare floor dial slowly back and forth between the two settings about 6 times and it apparently reset the clutch and now the cleaner bar spins normally and there's no more loud grinding-type noises. She said if that didn't work, the next step would be to remove the bottom protective panel (secured with the three large plastic screws) and lift the entire cleaner bar (do not remove the belt) out about an inch or so and then reinsert it and reattach the bottom plate. I hope this helps your problem. Good luck.

SOURCE: 2 year old machine...new noise in beater bar area

I have a dyson 17 animal and have a loud noise comming from the beater bar area.Also I don't think the hight adjuster is working properly.

SOURCE: ratchet noise, beater will not turn, belt not

Ok, so I had the same ratching noise and took the advice of many sites directing me to clean the brush. But like most I cleaned the brush and the noise continues and the brush does not spin. Reluctant to take it to get serviced I dug a little deeper and now it works just fine. This is what you need to do as removing any hair from just the brush part will not be enough.
Remove the entire brush bar from the bottom of the Dyson, this means pulling the bar out of the drive belt. This is not to difficult just use a little muscle as the belt will stretch. Once the bar is out grasp hold of the two plastic end caps on the brush bar which the brush bar actual spins in. These two caps are connected by a slim metal rod which runs through the brush bar. Place one hand on each side and begin to twist and pull until one of the caps comes off. Once the cap is off of the one side you can pull the other cap from the other side through the brush bar as this cap will be the one attached to the slim bar I mentioned above. If like mine you will see a ton of hair wrapped around these caps and inside the ends of the brush bar. Clean them out as best as possible.
After you clean it out, run the cap with the rod back through the brush bar, attach the other cap and twist and push together. Make sure the caps lineup which each other just like they were when you pulled it out. You'll notice how much more freely the brush bar spins between the two caps then before you cleaned it. Now, pull on the drive belt and feed the brush bar back through and attach as it was to begin with. This did the trick for me.