Re: hydraulic oil

Posted by TheOldHokie on August 01, 2009 at 04:28:39 from (96.236.83.235):

In Reply to: hydraulic oil posted by GB in MT. on July 29, 2009 at 14:06:50:

36 coupe said: (quoted from post at 05:57:21 08/01/09) Ive posted the facts.134 wont work in all tractors.The ring gear and pinion of the 9n are the same as a 29 Model A big truck.These gears were made to run in a 140 extreme pressure oil, not thin oil that gets thinner when it heats up.Ford Motor co did not reccomend using 134 in old tractor.New Holland did when the pulled the Ford label off the tractors.I have 90 ep in the differential of my 600.Kendall Ken Tran is a 40 weight transmission oil used in big trucks.We all know that old worn tractors cant use the 10/30 oils.They run better on original spec oils.Many 9n owners complain of increased leakage when 134 is used.134 is thin like atf fluid.A fellow who worked blending ATF said this.He started with a 20 weight oil and added red dye and seal conditioners.

Lots of opinion - very little fact there. You are entitled to your opinion but just because it's your opinion doesn't make it a fact.

And you are consumed with this idea that 134D is a "20 weight" oil that thins excesively when hot and isn't suitable for use in the differential of old tractors. So here are two facts:

1) The viscosity of Castrol UTF ( a 134D eqiuvalent) is 9.39 cSt @100C

2) The SAE viscosity specification for grade 80 gear oil is a minimum of 7.0 and a maximum of 10.9 cSt @100C.

So Castrol UTF (e.g. 134D) is on the high end of the SAE 80 gear oil band and is "thicker" than many SAE 80 gear oils when its VERY hot. That doesn't mean it's going to work as well as an SAE 90 gear oil in old worn out hydraulic pumps like the one on your tractor. But it does suggest that maybe the engineers actually know what they are talking about when they say it is suitable for use in the final drive of old tractors. SAE 90 gear oil was the best they had in 1940 - newer products have been developed and despite looking different they perform quite well. The viscsoity index of UTF is extremely high - nearly double a conventional gear oil. That's why it looks thin in the bucket but holds it's viscosity when hot.

So go ahead and use your SAE 90 gear oil in your worn out machine. I'll fix mine and use something that works a little better when it's cold and I'm plowing snow.

TOH

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