One measure of a good test procedure ultimately answers the question, “How well does the procedure duplicate field observed results?” This is especially true with test methods for hydraulic components such as pumps due to the unique wear processes at play in today's high performance hydraulic systems.
This paper discusses the development of a benchtop, surface contact pin and journal wear test method and the research conducted to determine its usefulness in predicting the wear characteristics of fluid system components. Discussed are the limitations discovered in the various other machines and methods used for assessing the antiwear characteristics of fluids (i.e., lack of fluid circulation system, lack of contamination control and lack of variable speed control of the wearing surfaces). These limitations are emphasized when applied to hydraulic system related testing.
Further discussed in the paper are two surface wear studies--one on the lubrication characteristics of hydraulic fluids and the other a wear assessment of fuel pumps. Both studies are shown to correlate well with actual field experience.
These studies are the basis to justify further efforts to correlate results from the bench test proposed with hydraulic pump testing. Such correlation would minimize the need to conduct the more expensive and time consuming pump testing.