It all depends on how well built the 6 volt starter is. Some work fine on 12 volts. A blanket statement saying they all will suffer is nonsense.
I've had a Deere 420, two Oliver HGs, two Case VACs, a Ford 641, and a Ferguson TO35 that have been using 12 volt batteries for 30 years now with no starter failures. Same for a Shaw tractor I have with a Wisconsin engine and Prestolite starter.
On the other hand - I put TOO much battery in a car with a 12 volt starter and two huge 12 volt batteries (in parallel). 327 V8 in my 1964 Chevelle SS. Direct-drive Delco starter. With one battery and cranking voltage at 9 volts it held up OK but was slow at times. Since I was getting big tractor batteries for free - I installed two. That brought cranking voltage up to 10.5-11 volts and starting breaking starter drives.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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