The purpose of a 'case drain' line on a hydraulic pump is to provide a low-pressure return path for any small amount of internal leakage that occurs within the pump housing (case). Hydraulic pumps, even when new, have some degree of internal leakage. This leakage is due to the necessary clearances between the moving parts, such as pistons, gears, and bearings. The leakage fluid, if allowed to accumulate within the pump housing, would cause the pressure in....
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