First; I bought this mower used, at an auction, no owners manual. I finally figured out how to drain the fluid, got out a full quart, but now how do I refill it? I filled the reservoir, about a cup, but very little actually went down onto the unit, maybe also a cup so now there's 2 maybe 2 cups in it. I can get the tractor to go, so I drove it a bit to see if that would draw more out of the reservoir, but it didn't. What's the trick to getting it to go down? Are there bleeders somewhere?