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 - Tractor Proflie: John Deere Model R - by Staff. The John Deere Model R, the last of the lettered tractors, was the first diesel-powered tractor produced by John Deere with a gasoline starting engine. It was also the first tractor they produced that had an optional steel cab. The photo above shows the tractor w
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