![]() ![]() oozing out of the vents in the hydraulic system-necessitating a foam test (ASTM D892). ![]() According to Matt, it wouldn’t be unusual for a customer to report seeing foam during operation-i.e. While most of today’s hydraulic fluids should have some type of defoamer, there is a limit as to how much air entrainment is too much for even the most robust defoamer. We can, in some cases, test the additive level and, in other cases, we can look for symptoms of additive depletion.”įor hydraulic oils, Matt recommends the following tests: “Once that starts to happen, you tend to see hydraulic systems developing operational issues. “Major lubricant formulators are adept at putting together a quality hydraulic fluid, but additives still deplete eventually,” he explains. Today’s hydraulic oils and their additives are fairly stable, but that doesn’t mean they will stay that way forever-they still need regular testing by an oil analysis lab for a number of factors, including additive depletion.Īccording to TestOil Field/Data Analyst Matt McMahon, who has been in this business for two decades, there are three primary additive classes for hydraulic fluids: antiwear additives defoamers, and anti-oxidants. ![]() Condition Monitoring for Hydraulic Fluid: Testing the Oil and Additives ![]()
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