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With most vacuums it's not necessary to completely dissassemble to the motor. Most rattles are either something stuck/jammed in, around the wheels and intake area. The rattle, if it's a knocking can also be the internal broken rod of the roller. Rollers can be purchased at hardware stores. Even Walmart and Target carry many models. There are screws in the back and front and guide tabs that the housing cover slips into in the front to remove the top cover as a last resort.
Try cleaning maintence 1st.
1) Unplug 2) Flip over and remove screws on the belt and roller face. Remove face-expose belt &brushes. 3) Slide brush out of grooves. If the belt makes you nervous, slide a large screw driver through it's loop to hold in place while you clean the roller. 4) See if the belt is in good condition free of cracks or tears. If it needs replacing, it slips over the motor spindle for simple change outs. The belt and roller part number should be listed on the vacuum if you look atround. Usually on a metallic plate installed during manufacturing.
You can take a 4' length of old garden hose and listen through it to the outside of the motor while running to see for sure if the noise IS coming from the motor, or infact it's the roller. I hope this helps you.
Have a look at www.dysonmedic.com which has some very useful info on dismantling and repairing Dysons.
Although this site doesnt actually cover the DC14 yet, the DC14 is very similar to the DC07 so as regards dissassembling the machine, and replacing the clutch, my experience is that the DC07 info will enable you to do the job.
Brushes not moving are usually caused by the turbine bearing seized. This job requires the turbine to be removed, completely dissassembled, cleaned new bearings and then re assembled and installed. The tank is another part, if your tank does in fact need replacement then the normal cost is between 45-60 dollars. Even if he completely replcaed the turbine, those cost about 35-45 dollars. I do know that the new tank style (all clear) is made much better than the original (2 color). This model is a good one. you are getting to the 50% of cost for a new model. if you get this one fixed make sure they install a gasket under the turbine, to prevent further issues.
All you need for your item is the belt.dissassemble the unit and you will se the track where the belt was, or even the old ne snapped an trapped somewhere inside. brush assembly purchase will not solve this.