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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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