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You did not state your model or make so I can't explain how to change your model but most vacuums you must remove the bottom plate held on by screws that covers the brush roll, remove the brush roll and belt and reverse the process with the new belt. Some models have the brush roll held in by screws and/or brackets, some brush rolls slide down into slots. Replace the brush roll if the bristles are worn or frayed. If you are not replacing the brush roll remove the endcaps if possible and clear any hair or debris that has worked it's way in there.
Cogged belts are different from stretch belts and do not need to be replaced at least once per year like stretch belts do. You should still remove the brush roll at least once or twice per year to clean out debris. Maybe more often if it gets hair or strings wrapped around it which can build up causing friction and heat which can melt or damage the brush roll or even the nozzle housing.
The brush is driven by two belts and a clutch. Your belts on the clutch are stretched. Their are several youtube videos for rebuilding and replacing a DC07 clutch. Just change the blets don't buy a new clutch. A lot cheaper to change belts. You might as well clean everything up while you gave it apart. Have fun.
Hair and debris works it's way under the end caps of the brush roll causing a restriction. If you can't clean the debris out and get the brush roll spinning greenly you may need to replace the brush roll.
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. If you find my solution to be of help, I would appreciate a Thumbs Up rating from you. Paul
You do not have to "twist" the belt.
You should be able to find your answer at this URL:
Look at the users guide for information on changing the belt.
I would suggest that while you are changing the belt, also take time to clean the beater brush, you have to remove it anyway to change the belt.
Clean the brush as best you can and add some WD40 to both ends between the brush and the small plastic pieces that hold it in place with the vacuum.
Two things you can do. 1- Remove the brush as if you were going to change the drive belt for it. Clean the brush as best you can and spray some WD40 on the hard rubber/plastic pieces at both ends of the brush. Rotate the pieces to work the WD40 into the space between the pieces and the brush axle. 2- If you have one available, as long as the brush is off, change the belt. This should get your unit back in operation. If you find this solution helpful, I would appreciate a Thumbs Up from you. Thank you. Paul
Is it the actual motor stopping or the belt that spins the brush that's slipping? if its belt slip, this happens, pretty common on all belt vacs, dirt and dust gets under the belt and causes it to just slip with no actual grip on the brush end. This slipping can also cause to much friction ware and actually changes the inner diameter of the belt so even cleaned it would still (maybe) slip so need a replaced belt. But I'd take the belt off first and clean it as well as the heads it spins over then try it again. Make sure you unplug from the wall, a vac brush can and will take your fingers clean off.
It is quite easy. Just take off the bottom of the vacuum encasing the roller brush. It should snap off or you may have to unscrew some screws and lift the cover off. Then remove the roller and clean it while you have it out. Now put the new belt on the motor shaft or pulley and slip the brush into the belt. Then replace the roller brush pulling the belt tight. Replace the cover and clean house.