Hi All, I picked an older SCAG hydro 52" last year and have used it about a dozen times and need to get some maintainance going on it. I need to change the Hydro Fluid but I don't really know how. I'm sure I could figure it out but I want someone to give me the skinny on it, Step 1, Step 2, Step 3 kind of thing. Here are some pictures of what I'm dealing with. It's an old guy and a little rough lookin but it'll huff and puff and cut your house down.