The reason the ring gear teeth gets damaged is that the starter drive gear teeth and ring gear teeth meet head on instead of meshing.
The cause of that could be insufficient bevel of the gear teeth or the one way slip clutch in the starter drive is seized or the starter solenoid is not working properly causing the starter drive to bang in and out....Or one made a mistake and accidentally hit the key when the engine was running
It has nothing to do with 6 to 12 volt(or 12v to 24v) starters as the starter drive is always fully engaged in the ring gear before the starter starts spinning.
I have 1 belarus tractor I converted from 12 to 24 volt for starting 27 years ago. I wore out 1 starter and 2 starter drives.
The ring gear has still all its teeth and was never replaced.
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Today's Featured Article - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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