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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