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Message: <blockquote data-quote="TriHonu" data-source="post: 13256" data-attributes="member: 897">Tazza is absolutely correct.  Wire drawing is the effect of molecules of metal being torn away from surfaces by molecules of a liquid traveling at high velocities.  Oil has a low Wire Drawing effect, however water will rapidly wear away sharp edges on pump gears and housings, edges of spools and vanes.  All these metal particles will then circulate and continue to further wear the system.Modern hydraulic fluids have anit-emulsifying agents which will help the water separate from the oil.  The water will settle to the bottom of the tank and all other low areas.You might want to drain the tank after the machine has been sitting long enough for the water to settle.  You can remove one of the small lines at the bottom of the tank.  No sense in pumping the settled water through the system again.</blockquote>