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I had the same problem with mine, I took it to a repair shop. The problem is where the belt passes through from the brush and goes inside the machine. Move the belt over a bit and you will see that a plastic guide has been bent over and is pressing onto the brush, which causes the noise. Just bend it straight again and it stops.
That is most likely what happened.
You may want to open up the bottom where the floor brush is and check the condition of the belt and as to whether or not something is caught in the belt or beater brush.
The owner's manual should provide directions on changing the belt.
While you are changing the belt, give the beater brush a good cleaning and add some WD40 to the ends of the brush where the plastic holders are located.
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Hi there SmartAlec from NelsonVacuums.com.au here. The rattle is the clutch engaging. It can happen for a couple of reasons. The best case for you is if there is something caught in the brush roller that you can simply remove. The next best is that the end caps of the brush are full of junk that you will be able to remove. Its not easy getting the brush out to clean there but it can be done. If the brush spins in your hand easily when the brush is removed then it is the clutch itself. THe main roller often melts which is caused when the tension on the belt gets to high thus creating too much heat. THis can be resolved only with a new clutch. Hope this helps, if you have more questions dont hesitate to reply or if you need parts just visit NelsonVacuums.com.au. Happy Vacuuming :)
When the Dyson DC07 makes that horrible grinding noise, there's really only one of two things that can be wrong. I have taken a few pictures to help you try and diagnosis the problem.
The grinding noise is made by the machines clutch mechanism. The clutch is what stops the roller brush from spinning when you change the vacuum from carpets to bare floors. The grinding noise is the clutch slipping, and not being to able to turn the belt. In most vacuums when the belt can not spin freely it will cause the belt to burn or to break. On Dyson's, the clutch mechanism prevents the belt from burning or breaking if you were to get something stuck in the brushes such as a towel underneath of a bad, or tassles on an oriental rug.
So when you hear this grinding noise, only two parts could be bad, the actual clutch mechanism itself, or the roller brush. I'll gladly help you diagnosis, and give you instructions on how to fix your Dyson.
Step 1. Make sure the vacuum is unplugged. Then turn the vacuum upside down so that the brushes are facing up. It's easiest if you put the head of the vacuum on top of a bench, or counter top. This is how the vacuum should look:
Step 2. You see on the bottom of the vacuum 3 plastic screws that are usually the same color as the vacuum cleaner. If you're vacuum is purple, the screws will also be purple. Use a flat head screwdriver, and turn each of the 3 screws a half of a turn, counter clockwise to loosen then. After each screw has been turned (you don't need to remove the comletely, just a half of a turn is all), simply pull upwards on the bottom plate to remove it.
Step 3. You should now be able to see the roller brush exposed. You'll now need to remove the roller brush. This will take some patience, and some work in order to get this brush out of the vacuum. There is a special tool that has been designed to help you get the brush out easier. I would try getting the brush out first before buying this special tool. The easiest way is to use a flat head screw driver and pry the belt up while pulling up and out on the brush. With some patience and some manuvering, you'll be able to get the brush out of the vacuum. Here's where you should put the flat head screw driver on the brush:
Step 4. Once you get the belt out of the vacuum cleaner, it's time to test it. Use your finger tips to hold just the end caps on the very end of the roller brush. While holding just the end caps, use your thumbs to try and spin the roller brush. Does the brush spin freely? It should rotate completely several times on each spin. If the brush doesn't spin, or you feel some kind of resistance to the brush spinning, then this indicates that your roller brush has gone bad. Here's a picture of how to test the brush:
If the brush however was able to spin freely, and it span multiple times on each spin, this indicates a little more serious problem of the clutch itself has gone bad. The clutch replacement repair is a much longer, more challenging repair to do. I posted a video on how to replace the clutch below so that you may follow step by step instructions on how to change it. It was really helpful for me the first time I did this repair.
I hope that this was able to at least diagnose the problem for you. That horrible grinding noise can only be one of those two problems. If you found this repair helpful, please be sure to rate the repair as helpful by clicking the thumbs up icons in the top right hand corner of the repair. Please feel free to check out our website for your future Dyson vacuuming needs, we have a lot of stuff already on the site, and if we don't have it up, we can definitely get it for you.
On a Dyson this engages the brush bar. Two possible faults: Debris (hair etc) caught in brush bar - cut out with knife. Or - damaged drive belt - pieces of belt striking casing. Last, but unlikely cause, debris in bearings of brush bar - replace brush bar.
Are the brushes turning? If not, take the brush block out and see if they turn easily, if they do, is the shaft sticking up still there, or has it broked off. Turn on the unit while the brush block is out, the nosie still there? If not replace the brush block #48437029. If noise is still there, it could be the turbine #43191005 or even the motor #43576197.