Vacuumed up an apron string and turned off the vacuum as it started to smoke--rubber I think. Took off the bottom four screws and checked -- one thin belt OK, 1 large belt on a large roller behind the brush--but just hanging there...wish I had an exploded view of what it should look like correctly put together--does that large belt need to go back around another wheel or around that metal post that sticks out behind the roller brush?
Yes, one end goes around the large wheel and the other end goes around the metal post. If the rubber band isn't set around the metal post correctly, it can slide off - and if it doesn't slide off completely it'll continue to turn and burn rubber as it's rotating off the big wheel. It can ruin the band obviously, but they're fairly inexpensive to replace.
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The problem is that you have is that hair,strings,etc has gotten wrapped around the beater bar of the vacuum and it is trying to slow down the motor but the motor will not slow down so the smell you smell is the belt burning up because it is slippling and creating smoke and smell
You will need to remove the beater bar from the bottom of the machine and clean the hair,strings,etc from around the bearings on each end of the beater bar.
Also check your filter bag, check the hose going to the vacuum if you have one for blockages, and once you have the beater bar off check your belt condition and look for blockages going to the bag.
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If there are no obstructions and it still makes the grinding noise here is something to try. When you take the bottom plate off which is real easy to do (3 plastic screws turn 1/4 turn with a coin) there is also on the bottom of the vacuum a rubber seal. This is located just above where the screws are inserted. Take a butter knife and remove this seal...it is very thin and runs the width of the bottom of your vacuum. Put plate back on and try vacuuming again..problem should be solved. The suction on the machine is tremendous...with the seal in place the vacuum literally sucks itself down on the carpet causing the brush to stop spinning. This wwill not hurt your vacuum in any way. Hope this helped.
I can't probably help you but I can tell you what Dyson told me. I have this same vacuum and it just started making that same noise. When I called their rep they had me take off the bottom plastic piece (comes off real easy by taking a coin and turning the three circles). Check to make sure the belt isn't broke. Then, they had me pull toward me the roller brush and turn it to get it seperated from the belt. Then, take off the belt. On mine, the spindle was full of dog hair clogging it. I took twizers and narrow pliers and pulled everything off. Then put it back together. It worked fine for the next few times I vacuumed then it started again. So, I did the same thing again and found this spindle covered with the hair again. Cleaned it, put it back together and it worked again. Today, while vacuuming I picked up a piece of string and that noised started again. Turned it over and saw that string on that spindle. Took it off, cleaned it and it worked again then started the screeching again. So, tomorrow I am calling a vacuum repair place. IF you have the same vacuum (which you do) it should still be under warranty. Dyson told me I would have nothing to pay unless I abused the vacuum which I did not. Hopefully I am not without it very long...I have two golden retrievers who do shed alot.
I had this same problem. The brush roll wouldn't spin, smoke came out, and it smelled like burning rubber. I changed the belt thinking that would fix the problem but it didn't, so I took the belt back off and checked the motor shaft in the back and found a whole bunch of hair wrapped around the shaft. Once I cut out the hair with some scissors and replaced the belt, everything worked like normal. I hope this helps.
First check to see if the gray plate that you removed to access the brushbar is back on the machine properly. Also, make sure that the long black strip on the plate is on properly and is not making it harder to push the machine.
Lastly, you are able to remove what is called a "ropeseal" from the bottom of the machine which will allow more air to flow underneath the machine. This won't affect the suction power of the machine.
To remove the ropeseal, take the gray soleplate off again and have a look at what would be the inside of the plate - you'll see a long, thin piece of rubber/foam that looks like a rope/string sitting in a groove all the way around the openings that the brushbar bristles stick through. Remove the seal and keep it in a safe place. Your machine will be easier to push now.
Flip the vacuum cleaner over and check the roller brush. Is it full of string and hair? If so, unscrew the four phillips-head screws holding the plate on that covers the roller brush; pull out the brush, and cut off/clean off all the hair and string. Replace everything and try running the vacuum. Alternate solution: perhaps the belt that makes the brush go around is broken. If so, follow the above steps to remove the roller brush, then replace the belt.
Yes you do need to replace the belt they stretch out. Think of a belt like a big rubber band if you were to stretch it out and hold a lighter to it the rubber band would stay stretched out. That is the same thing that happens when you get it caught on string or an area rug the brush stops but the little metal shaft keeps spinning creating heat and stretching the belt. Visit www.stevessewandvac.com for belts, bags or any other vacuum need.