SYMPOSIA PAPER Published: 01 January 1971

Maintenance of Cleanliness of Hydraulic Fluids and Systems


The cleanliness of a hydraulic system and its fluid is an important factor in the proper operation of such a system and its components. The sources of contamination and prevention of it are discussed. Types of contaminants are classified as particulate matter or liquids and gases in both free and soluble phases. Their effect on systems and components are discussed briefly. The methods for measurement of contaminants are reviewed with special attention to water and gas content. Techniques and practices for contamination prevention and control are described. Applications of filtration, dehydration, and degasification of hydraulic fluids in hydraulic systems are suggested, including totally enclosed circuits.

Author Information

Baranowski, L., B.
Keene Corporation, Cookeville, Tenn
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Developed by Committee: D02
Pages: 18–28
DOI: 10.1520/STP44723S
ISBN-EB: 978-0-8031-6041-5
ISBN-13: 978-0-8031-6195-5