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 - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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