Posted by Anthony G on April 19, 2014 at 06:24:32 from (198.144.56.136):
I've read that the reason why GL-5 gear oil should not be used is that it is not friendly to yellow metals which may be present in various parts in old tractors. The truth seems to be more complicated. In fact, GL-5 is compatible with yellow metals because the sulfur is "buffered" and so does not corrode yellow metal. However, because of the greater quaintly of EP additive (the sulfur) present in GL-5 if can cause a problem of wiping away a thin layer of brass from some parts (synchronizers) when under load, whereas GL-4 which doesn't have as much EP doesn't do this (however it does allow more wear to happen to other parts). So, since a JD-40 and pretty much all tractors lack synchronizers in their transmissions, it would seem GL-5 is just fine. Agreement on this? Anything overlooked. Thanks in advance.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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