I have wondered about a similar question. Have an old (mid 60's) Gleaner combine. It has hydraulic lift cylinders for the header, the reel, the power steering, and for an adjustable sheave for variable ground speed. There are no wet clutches or transmission elements associated with the hydraulic system. I believe the hydraulic pump is a gear type pump. The owners manual states to use "Type A" automatic transmission fluid. Why? Was universal hydraulic fluid not commonly used at that time? Could the "Type A" automatic transmission fluid be flushed and replaced with universal hydraulic fluid at this time? If not - why not? I am aware that Type A was replaced by Dexron then Dexron II, then Dexron IID, then Dexron IIE, then Dexron III (which is backward-compatible) and now by Dexron VI. It would be less costly and simpler to convert to using a universal hydraulic fluid, but are there drawbacks or something I am missing? Can someone please clarify this issue. Thanks.
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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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