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Since the late 1970's, biodegradable fluids have been used in hydrostatics with limited success. Performance has not matched expectations during extensive field testing. For example, fluids reported as having excellent lubricating properties, by bench and field testing, produced excessive wear. Design modifications successfully resolved some of these problems, but wear problems with sealing and bearing surfaces still exist, suggesting that fluid properties may need to be modified. New test procedures measureing wear e.g. may need to be developed as well because of the correlation problem between reported fluid properties and axial piston pump performance like good lubricity resulted in excessive wear.
biodegradable fluids, needle bearing wear, radial lip seal shaft wear, friction coefficient, rape seed fluid, synthetic ester, spline wear, DU-Bearing wear
Manager, Technical Sales Literature, Fluid Specialist, Sauer-Sundstrand GmbH & Co, Neumünster,
Chief Metallurgist, Test Lab and Metallurgy Testing, Sauer-Sundstrand Company, Ames, Iowa