Re: History of Tractor Hydraulic Fluid

Posted by Joe Evans on April 30, 2004 at 05:48:36 from (209.41.233.78):

In Reply to: History of Tractor Hydraulic Fluid posted by Niely on April 29, 2004 at 16:26:06:

My W-9 calls for 90W gear lube in the transmission and final drive. The W-9 was developed at the same time as the letter series Farmalls and appeared on the market in 1940.

90W is what I grew up with. Dad used it in our H and JD 60. The "new fangled" 460 Dad got uses Hy-Tran. Someone check me on this, but I believe the -60 series Farmalls were the first to go 100% UTF in the IHC product line. The -60s appeared in 1958.

I often raise my eyebrows whenever I disconnect a remote cylinder hose from the 460 after working it a while. Inevitably very small amounts of fluid escape when decoupling. That warm fluid hasn't much viscosity at temperature. Just wonder how it provides adequate film strength for the gear teeth. Obviously it must work OK.

Dad worked for an asphalt paving company. Apparently some of the equipment he was around required 140W gear lube as he had a couple of pails of it on his company truck. Man, that was some thick, nasty smelling stuff. The truck's bed always reeked of that gunk.

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