This 401c is new to me. Had it a few months. So I blew a hose going to the power steering. I had one made and put it on. Now to top off the fluid. I researched what to buy. Found out it needs the Hy-Gaurd. Former owner told me just dumped in the cheapest hydraulic oil he could find at the farm store. I want to dump it and fill it with Hy-gaurd. The manual has instructions for changing the filter and topping off the oil, but not where the plug is to dump it. Where is the plug to drain the resivoir?