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 - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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