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I've found step by step video demonstrations for cleaning, belt replacement, basically maintenance of different appliances on "YOUTUBE" you might want to check it out. Just type in Bissell 4104 beater bar replacement. Hopefully there will be a video showing you exactly how to replace it properly.
Remove the beater bar and clean the debris from the bar and the end bearings. Remove the belt (remember how it is installed) and check it for any damaged areas. Make sure the bar turns freely before the belt is attached to the motor drive. Hope this helps!
Hi. This isn't a hard repair at all.... Unplug your vacuum. Turn the vacuum beater bar side up. Locate the catches or screws that hold the plate on that covers the beater bar. Remove the plate. The beater bar sits in sockets where it attaches to the vacuum, so remove carefully, making note how it comes out. This will make reassembly much easier. Place your new belt on the motor shaft, then onto the beater bar while you replace the beater bar back into the sockets. Test your work by revolving the beater bar a bit by hand. Reinstall the cover plate. That's it!
Ours has been doing the same thing...the beater bar end plates, black thins, and the little groove area they go into are worn of the front and rear surfaces. You could buy a new beater bar but the wear on the housing would require quite a bit of work to replace that hole piece.
You will also notice that the belt is loose due to this wear.
Solution....duct tape to the rescue!
I took out the beater bar and took a strip of duct tape about 1-1½ inches long and folded that over to be a long narrow pad that fits in the groove that the beater bars end plate slides into...the groove to the rear of the beater bar.
Then I took a piece of duct tape and taped the little pad/shim I made to the rear edge of the beater bar so the pad will be in the groove when the bar is installed.
Put the bar back in carefully and no more noise and the belt is now tight again.
The fact that these 2 parts wear on each other and this affects the tension of the belt is what causes the noise...the sloppy belt will get so bad it will start jumping over the teeth and soon after it will break.
My wife was impressed...hope it works for you too...
Would make sense to make a more permanent solution but I just did this a couple days ago and we have vacuum the whole 2500 sq. ft. house with no extra noise...I have time to figure out better...maybe a harder plastic cut to fit in there...
Possible Solution: I had the same problem with my Powerforce vacuum. Please take note that I AM NOT a vacuum cleaner repairman, nor have I played one on TV. Try taking your beater bar out, and if it looks similar to the one pictured (Model#203-1195), get a cresent wrench. Look at the end of the beater bar one will be squared on the sides to hold the shaft inside statonary. Take the wrench and adjust it to fit the nub on that end. Grab the bar in the center, and turn the end with the wrench. Mine popped and came loose, then it could be turned by hand. A little light oil allowed to run into the end cap, turn it up and spin it a few times to let the oil work down the inside and put it back on. Mine works fine for now. Good Luck!!