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The qualification of fluids for use in a hydraulic system has been a major concern to component manufacturers for several years. The primary issue in a hydraulic system is the compatibility of the fluid with the main pump in the system. There are several bench-type wear tests for the evaluation of fluids, however, most of these are not intended specifically for hydraulic fluids but were developed for lubrication fluids. Therefore, many engineers have relied upon the pump tests which were available in order to select the fluid to be used in their hydraulic system. The testing of a hydraulic pump to qualify a hydraulic fluid is very time consuming and expensive.
This paper reviews several of the more wide-spread bench-type tests which are used to evaluate hydraulic fluids. However, the main purpose of the paper is to describe a new test system for evaluating the anti-wear characteristics of hydraulic fluids called the Gamma Wear Test System.
Fluid qualification, fluid testing, gamma wear testing, lubrication, hydraulic fluid
Vice President, FES, Inc., Stillwater, OK
Laboratory Manager, FES, Inc., Stillwater, OK