Drill 3 or 4 holes along the path of where each gear tooth is missing. The holes should be sized to about 75% of the width of the tooth at its base. Drive appropriate sized screws into the holes. Clip off the tops of the screws to match the original tooth height. File the sides of the screws at an angle to match the original tooth sides. You are essentially replacing the missing gear tooth with three or four screws filed to match the tooth profile.
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The problem seems to be the plastic gears and/or bearing supports. Unless it is in warranty, it's going to cost you more to repair than replace, and even then Ativa's customer service is not the best and neither are their shredders: I suggest you look at http://www.complaintsboard.com/complaints/ativa-paper-shredder-c31646.html?page=2
I have to believe that you could find a place online for this gear. My other thought is looking for a replacement out of an old printer, typwriter or something along those lines. The shredder is not that complicated and if you get a little inventive you probable have something broken at home that would work for that.
took the shredder section apart, cleaned out the gears of paper and a broken mount (plastic piece), and hand turned the electric motor to free it up. After assembly, the ready light works and so does the FWD/REV directions for shredding.
Chances are with this model, you have overloaded the infeed and broke the plastic drive gears.
Good luck on finding service and parts because on these cheeper products, the parts are almost as expensive as replacing the machine.
If you main gear drive is broken you probably had a paper jam, so your shredder blade gear will break soon. By the time you purchase the part and pay for the shipping it would cost just about the same as gettin a new one. Then you will not have to wotty about anything esle breaking after you get this part because of the stress you put on the motor and other gears. I hope this helps you.
If you shredder is like our Ativa DX200D I have a pretty good idea what the problem is. Our shredder had the same identical issue, it was out of warranty so opened it up to see if there was debris in the teeth that could not been seen from the outside. To my surprise one of the steel gears (a 3" diameter one, very heavy too), had 5 teeth worn down, and after testing I determined that the judder happened when the shredder ran with any kind of a load and the gear came around to the side with the worn teeth.
You may need to find a replacement gear, or just buy a new shredder.
If this unit is worth it to you, you can build your own gear. Here is a link to get plastic repair materials to make plastic parts. This site also will have materials for repairing plastics.
Another possibility is to search Ebay for a unit like yours which has other problems. Never can tell... it may be there. Make sure you ask for the model of the unit in your search (on the NET as well. The serial in this case is not needed.