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Hydraulic Reservoir Breathers How Good
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1975 by SAE International in United States
Annotation ability available
The U.S. Army Mobility Equipment Command is responsible for specification requirements for a number of kinds of construction equipment. In studying a newly acquired warehouse forklift truck, it was noted that the hydraulic fluid was quite clean even though the system filter was not an exceptionally good one. The vehicle manufacturer stated that a study had indicated that the air breather on the reservoir was a major ingression point for contamination. As a result, this company had equipped the vehicle with a much more efficient breather than required by the Government specification.
No reasonable breather test standard appeared to exist. Engine air cleaner tests were judged unsuitable and extremely complicated. A test was derived to simulate the oil volume change normally found in warehouse forklifts (Fig 1).
Breathers tested included sintered bronze, phenolic ribbon, and pleated paper elements. The test showed dramatic differences in efficiency and dirt capacity of breathers, not always related to size, cost, or “nominal” rating.
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CitationKarhnak, J. and Spelten, H., "Hydraulic Reservoir Breathers How Good," SAE Technical Paper 750853, 1975, https://doi.org/10.4271/750853.
- “Air Cleaner Test Code” SAE J726 Society of Automotive Engineers, Inc.