The Brushbar bearings will be away. Fitting a new Brushbar should resolve the problem.
Piece of debris stuck in roller causing belt to slip and squeel
On mine, it was the two little wheels on the outer back portion of the vacuum head. Where the red tabs lock in to hold the brush cover in place. 
SOURCE: Dyson suddenly hard to push on carpet
I know this sounds silly, but it works. Turn it over and wipe all the black residue off the bottom of it (off the plastic on the bottom that rubs on the carpet as you push and pull it). I thought my husband was out of his mind when he told me that was the solution, but it really works.
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.
SOURCE: dyson dc14 died, no power after burning smrll
It sounds like the motor has overheated and has now been irrepairable damaged.
The motor has a built in over-current trip to protect itself (and you if it seriously overheated and caught fire). This normally automatically resets itself, however if the motor has just about had it, the moment it is switched on, it just trips again.
The primary cause of motors overheating is that the filters are not cleaned or replaced frequently enough. Dont be fooled by Dyson's "lifetime filters". They need to be regularly cleaned and replaced when necessary.
Replacement motors are avaible on eBay for about £25, however repalcing one requires good DIY skills and tools.
Have a look at www.dysonmedic.com and see if you feel you can tackle it yourself. If not, take it to a repair shop or call the Dyson helpline.
Testimonial: "thanks so much for taking the time to reply...sounds like we need a replacement!!!...will get the dyson ball this time..hope it's good! thanks again!"
SOURCE: why does my Dyson animal
I can't probably help you but I can tell you what Dyson told me. I have this same vacuum and it just started making that same noise. When I called their rep they had me take off the bottom plastic piece (comes off real easy by taking a coin and turning the three circles). Check to make sure the belt isn't broke. Then, they had me pull toward me the roller brush and turn it to get it seperated from the belt. Then, take off the belt. On mine, the spindle was full of dog hair clogging it. I took twizers and narrow pliers and pulled everything off. Then put it back together. It worked fine for the next few times I vacuumed then it started again. So, I did the same thing again and found this spindle covered with the hair again. Cleaned it, put it back together and it worked again. Today, while vacuuming I picked up a piece of string and that noised started again. Turned it over and saw that string on that spindle. Took it off, cleaned it and it worked again then started the screeching again. So, tomorrow I am calling a vacuum repair place. IF you have the same vacuum (which you do) it should still be under warranty. Dyson told me I would have nothing to pay unless I abused the vacuum which I did not. Hopefully I am not without it very long...I have two golden retrievers who do shed alot.
SOURCE: I have a Dyson DC14
Hello,
This sounds like your roller brush has stopped spinning for some reason. Turn the machine upside down when set to carpeting, and make sure the handle of the vacuum is down, as if you were in the vacuum posistion, and not up like the handle is when you're storing it.
Is your brush roller spinning? If it's not, there are two kinds of agitator brushes on the Dyson DC14, each has it's own troubleshooting.
If your beater brush is perfectly rounded in shape, then you have the newer style Dyson DC14 that doesn't use a clutch mechanism. Either belt has broken, or falled off, and is causing the brush not spin. Here's instructions with a pictorial on how to fix this problem;
Step 1. Unplug the vacuum cleaner.
If the roller brush still doesn't spin after checking and removing any obstructions, then you need to replace the belt (or clutch if you have the early models). Here's a video that explains how to replace the clutch mechanism on Dyson vacuums;
If this failed to fix your problem, or if you have any other problems or questions, please feel free to just reply using the comment box below, I'm always happy to answer anyones questions or concerns. I hope this helped you. Please do be sure to rate my repair, or leave feedback for me if this helped. This is greatly appreciated by the Fixya community.
Chris Jones
GoVacuum.com
6,768 views
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