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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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