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The easiest one is that the brush has hair and fluff wrapped around its bearing. This happened to me and was causing a burning rubber smell. Turn it over and remove the base plate. Lift the belt by putting a piece of cord under it and slide the brush out. Remove one end of the brush and slide the spindle out. Clean all the hair out and reassemble.
The internal drive belt is worn, or the nylon bush that it runs on.
The clutch is worn out.
The last two are not as easy to fix as the main drive belt is enclosed in the centre of the clutch. There are videos though that show you the process. Have a read and a watch, but try my first tip first.
Brush bar not rotating - Dyson
www.dyson.co.uk/.../brush-bar-not-rotatingBrush bar not rotating. ... to ensure vacuums containing Dyson Cinetic™ science maintain constant suction. ... tested at the cleaner head.
Lubricate each end of the roller brush with motor oil. Bearings inside the roller brush need lubrication for the brush to turn easily. Remove any pieces of thread that have wrapped around the roller brush. If it does not spin after doing the above steps, then either the belt is slipping or the bearings are severely damaged in the roller brush. Then you need either a smaller belt or a new roller brush.
I would suggest taking the brush bearings at each end off and clean any lint or hair that might be in the ends of the brush. If you have regular ball bearings on your brush, you might need to replace the brush roller if the bearings themselves are tight. Hope this helps!
I'm sorry to hear you're having difficulty with your DC39 Multi Floor. If the brush bar only seems to be working intermittently, we should be able to help - and if a replacement part is needed we can confirm if this is covered under our 5-year warranty.
When you have your machine easily to hand, please give our experts a call on 0800 298 0298 (UK), 1-866-693-9766 (US), 1-877-397-6622 (CA) or 1800 239 766 (AU).
I have the same problem with my DC39 Animal's brush bar. Im on my 3rd one in 9 months of ownership. The DC39 brush bar is driven pneumatically (there is no electric motor in the brush head) and switched on and off via a suction activated pneumatic ratchet within the brush head. The moving components are actuated by bellows. Ive found that the glue holding the bellows fails stopping the ratchet working intermittently at first and then completely as the bellows comes away completely. At first you can help the ratchet by tapping the brush head - the red ratchet ring can be seen to click round. This, in my opinion, is an inherent weakness of the DC39 design and cannot be easily repaired. The only solution is a new brush head. Luckily Ive got a 5 year warranty and at the current rate I will have got through about 20 brush heads !
if the belt is more then 6 months old or more, then the belt will have to be replaced reguardless of the way it lookes. belts can stretch over time and when you put the machine on the carpet the friction causes the brush to stop because the belt has stretched. i would try this first. hope this helps
I thought my brushes were clean, but here is what I discovered, and it fixed my Roomba.
The yellow bearing on the opposite end the brush rollers from the gearbox will pull off the shaft. These bearings spun freely and looked clean, but when I pulled them off there was hair and junk between the end of the brush and the back of the bearing. When installed in the Roomba this gook warms up and gets sticky causing friction and stopping the brush from spinning.
Use a toothpick to pull this stuff out and the brushes spin free again. I was very frustrated, and this fixed it, works like new again.