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Hydraulic SystemXR620/621/842/1045/1245/1254/1267/1534/2050/30348-5 KEEPING THE HYDRAULIC SYSTEM CLEANThe hydraulic system has been carefully designed to keep the hydraulic fluid free of contaminants. SeeFigure 8-2 for a schematic diagram of the hydraulic filtration system. The filtration system is comprised ofthe following components:• Air breather (10 µM absolute).• Suction strainer (200 µM).• High-pressure filter (10 µM absolute).• Return line filter (10 µM absolute).Note that one micron (1 µM) is equal to one-millionth of a meter. Regardless of how thoroughly thesystem filters the fluid, it can easily be defeated by poor maintenance practices. To keep the hydraulicsystem free of contamination, it is essential that the following maintenance practices be followed:• Clean exterior surfaces of dust, dirt, hydraulic fluid, etc. before removing covers.• Ensure that new parts are clean before installation.• Keep parts protected prior to assembly or installation.• Protect system openings. Use covers, tape, plastic wrap, etc. to cover the openings.• Keep fluid transfer containers, funnels, nozzles, etc. clean.Service Manual Rev 01 – 05/10 8-4P/N 24933-000