The starter is hitting the ring gear too hard since it is 12 volt. There are different drives for many started that soften the engage force on the ring gear. I do not know if there is one available for your TO-20 tractor. The teeth on the ring gear get worn down and filing them may get the rough spots off but the teeth on the ring gear are still shorter than they should be. You may need to replace the ring gear to get the grinding noise fixed.
I am not a fan of switching the 6 volt starter over to 12 volt unless you can change the drive. The straight 6 volt starters engage too hard when ran on 12 volts.
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Today's Featured Article - Little "M" - by Donnie Anderson. They call me "Little M" and this is my story. For the past several years I have sat against the tree-line, where my parts have rusted and rotted away. For all of these years I have wondered just exactly what happens to old tractors? Times were not always like this. I can remember back to 1948 when I was a brand new John Deere Model M. A man and his wife came to the dealer and looked me over real good. After many talks with the salesman a deal was struck and I, along with a M2 plow, c
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