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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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