Hydrostatic systems aren't as picky about what kind of oil they use as what some folks would think. As an example, Danfoss approves a wide range of oils for use in their pumps and motors including various grades of engine and hydraulic oils, ATF, universal tractor fluid, and various bio oils. The important thing is that the viscosity stays in the correct range over the entire operating temperature range. If you don't operate your machine in extremely cold conditions a more viscous oil should not be a problem. You might put a gauge on your case drain line - if the pressure stays below 50 or 60 psi during cold starts and gets down to no more than 20 psi or so when warmed up your shaft seal will be fine.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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