Short answer is, because the tractor is 70 years old and anything could have been changed on it in that amount of time for just about any reason you can imagine.
You would not believe some of the crazy farmer modifications that have been done to tractors over the years. Putting 8-bolt hubs on an 8N is actually one of the tamer more sensible modifications.
It may be possible with a simple hub swap and the right wheel bearings, OR it may have been done by cutting the original spindles off and welding on heavier spindles for the 8-bolt hubs.
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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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