More than 75% of all problems with hydraulic systems can be linked to contaminated oil. Bosch Rexroth’s Oil Cleanliness Pocket Reference helps technicians determine sources of problems with hydraulic systems, as well as understand the basics of contamination control and good filtration practices. The book includes an overview of key filter properties, fitting tolerances of hydraulic components, recommended oil cleanliness levels, an exploration of the sources of problems with fluid systems, common types of oil contamination, and how to achieve oil cleanliness. The 44-page pocket-sized booklet is printed on oil-resistant paper.