Original type "A" trans fluid was 20wt non dergent oil with a red dye. It was used in auto trans and power steering applications. Then the next generation fluid had additives added, for oxidation and friction modifiers. Delco spec had more friction modifiers than the ford spec, so there where two types of oil at that time. Also around that time, sperm whale oil was used as it had better viscosity control than 20wt crude. IIRC around '74? the sperm whale oil was outlawed and replaced with a modern multi viscosity oil. As by then oil had improved a 100 fold and could provide better characteristics.
HD motor oils can "super clean" a power steering system and by cleaning, cause worn seals to leak. However if the seals are already leaking, into the crank case, then motor oil is usually preferred to reduce contamination of the hd engine oil with light duty hydraulic oil.
Lots of new hydraulic equipment is now calling for hydraulic oil with "anti-wear" additives so the line between hd motor oils and hydraulic fluids has been blurred. Also more pressure, higher flow rates, higher heat in hydraulic shifting applications have called for "synthetic base" hydraulic fluids further blurring the line between the high end motor oils and high end hydraulic fluids.
Old power steering systems ran 300 lbs of pressure, where 2800lbs and more are being run in some combination systems today.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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