If you look inside the case of the rear end of an M, you will see small troughs cast into the sides of the case. Those troughs were designed to carry lubricant forward to the bearings and gears in the front of the case. If you put too heavy lubricant in the rear end, the lubricant will just spill over the sides of the trough before it can get to the front of the case.
My Dad figured that out many years ago and replaced the lubricant with a lighter grade so it would flow in the winter time. It made a bit more noise, but there were no bearing or gear failures that those tractors were known for back in those days.
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Today's Featured Article - Good As New - by Bill Goodwin. In the summer of 1995, my father, Russ Goodwin, and I acquired the 1945 Farmall B that my grandfather used as an overseer on a farm in Waynesboro, Georgia. After my grandfather’s death in 1955, J.P. Rollins, son of the landowner, used the tractor. In the winter 1985, while in his possession the engine block cracked and was unrepairable. He had told my father
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