We are ready to reinstall the power steering unit, I took the whole assembly to our local JD dealer and had them go through it. Before removing the valve body the manual says to remove the drain plug on the right side of the clutch housing to drain the oil, which I did. There was a fair amount of sludge in the bottom of the housing, any ideas of where it came from. Also do we need to put oil back in the housing before putting it back together? Can't figure out how the oil gets in there. Thanks, Tom