WIXOM, Mich.—Hallite Seals Americas Inc. and the Milwaukee School of Engineering's Fluid Power Institute has developed a test method to protect hydraulic systems from dirt and dust.
The test better measures the amount of harmful contamination that enters a typical hydraulic system through the rod wiper, measuring dry particles attributed to being a major cause of hydraulic system inefficiency, degradation and failure.
Hallite said no International Organization for Standardization (ISO) method exists for testing a rod wiper's ability to prevent four, six and 14 sized micron particles from entering the hydraulic system, which according to ISO 4406 are the three most damaging to the system.
Hallite partnered with MSOE to attempt to fix that. The firm provided insight for the school to develop the test fixture, rig and develop the procedure. The two took an SAE International standard, J1195, as a baseline and in eight months developed the new procedure.
“Pretty much in the industry right now there is no standard rod wiper test,” Business Development Manager Chuck White said. “Even though there was SAE, nobody ever used it. It's very old and wasn't directed specifically at hydraulics I would say. It was more for power steering and not accepted as a standard rod wiper test.”
One key element Hallite wanted to improve upon was to identify specifically the particle sizes contaminating the system. White said the SAE standard utilized gravimetric measuring, or the weight of the oil, to determine how much contamination was coming by the rod wiper. That process determines the weight of the oil before and after the test but does not specifically identify how much of that contamination truly is threatening to the system.