SYMPOSIA PAPER Published: 01 January 1997

Tribological Experiences of an Axial Piston Pump and Motor Manufacturer with Todays Available Biodegradable Fluids


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.

Author Information

Witte, KH
Sauer-Sundstrand GmbH & Co, Neumünster, Germany
Wills, DK
Test Lab and Metallurgy Testing, Sauer-Sundstrand Company, Ames, Iowa, USA
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Developed by Committee: D02
Pages: 208–219
DOI: 10.1520/STP11848S
ISBN-EB: 978-0-8031-5366-0
ISBN-13: 978-0-8031-2422-6