I was vacuuming and started to smell burning rubber, so we took the floor brush out to clean it out and we also checked the belt. The belt looked fine and the brush was all cleaned out, but when we put it all back together the brush wouldn't spin. By looking at the parts, we don't understand how it can spin (granted, we aren't vacuum experts). The ends of the brush fit into these grooves and we don't understand how it spins when the ends fit tightly into these grooves. When put all together the vacuum still runs, motor pulley still turns, but the belt doesn't turn, and we still get the burning smell (from the pulley rubbing against the belt). We think the solution must be simple, but we're stumped!
I just fixed mine. It took me all of 10 minutes. Pull the brush out. Stand the brush on end on the edge of your study work bench/table top. while holding the brush vertical( on end) take a small phillips screwdriver and tap using a hammer on the metal pin you see in the middle of the brush. Keep tamping and the whole assembly will come apart. What you will have then is a long metal shaft, 2 bearings(they are acutally skateboard wheel bearings same number same make). Clean the gobbed up hair with a razor blade and then reassemble by tapping back together. The bearing wont be worn out because they are way too tough for a vaccum. We used ride down hills on them! a ten minute fix wow and you wont have to drive to vacuum shop and spend $$ and time
I had the identical problem. One side of my end cap/bearing had actually melted together so that it appeared to be one piece and thus making it impossible for the roller brush to turn. Even though I was able to get the end cap and bearing apart using channel locks the parts were too damaged to use so I've ordered a new brush.
If you take out the brush roll, holding the ends, make sure that it spins freely, if not, replace it. Belts stretch after a short time of use and need to be replaced often. A slipping belt is what can cause the rubber smell. So you either have a bad brush roll and/or a stretched belt.
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Your belt is burning and will eventually wear down and break. The green light comes from copper brushes on your roller creating an electrical current that lights the little green light. As long as the roller is turning, the light will stay on. There may be something jamming the roller (hair, string, paper, etc). Clean the roller off and replace your belt. If you don't replace the belt it will break soon enough. Once you start smelling the "rubber burning" smell it's and indication that your belt has deteriorated at some point and has a weak spot in it. Clean the roller and replace the belt and it should be fine.
Easy to fix. The burning rubber smell is hair in the roller against the belt! Congrats, you have a healthy vacuum, you are lucky! Unplug the vacuum, remove the screws that cover the belt and roller brush. If you are nervous, take pictures with a cell phone or digital camera as you go for re-assembly. ok, pull the long roller out of it's slot and out of the vacuum. cut all hair off the roller and carefully move the belt from side to side to do the same. If the belt slips off, it slips back on easily. If the area is too tight for fingers guide it back on with any long thin wooden object. You can squeeze the belt to narrow it and slide it back over the thin metal rod that spins it from the motor. Slide the roller through the belt and back into it's slots. If it won't slide back on, turn it a quarter turn. Repeat till it does slide back into place. Put the face plate back on-tighten screws, flip it over, plug itr in and it should work!
If it is a smell of burning rubber - most likely your vacuum belt is overdue for replacement.
At this point - remove the brush roller, remove the old belt, clean off your brush roller and remove any string or hair that may be bound up around it (usually around where the belt goes or on the sides), and put on a new belt. Your Kirby should act good as new if your bag is replaced at the same time.
If the brush roller has too much string and hair wrapped around it, many times the brush roller will not spin as fast as the belt is driving it and you will get that burning smell.
OK - so your brush roller is jammed. And yes, the belt is melting! Unplug the machine, remove the belt (you will need another new one anyway) then see if you can turn the roller by hand. If it turns freely without you doing anything else, then you may have put the new belt in incorrectly. However, you will probably find you can't turn it, or it's hard work (it should rotate freely). Remove the roller and check the bearings - there may well be something tangled up at one end of the roller. If you can get the roller rotating freely, all should be well.
The belt just goes from the motor shaft to the brush roll. Do the ends of the brush trun freely, or is one of them froze up, if so replace the brush roll. If it is ok, try to turn the brush roll by hand, maybe the belt got pinched and won't move.