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I guess I should have done an update. I ended up buying the Harley Rake, a 6' model for my skid steer. After a little practice, I can grade just about any rough surface in no time, with 1 laborer to tidy up behind me. A couple weeks ago I did a job that was 20,000 square feet of extremely rough and overgrown land and turned it in to seeded lawn in 2 days time, smooth as silk. I'm really upset worth myself for not taking before and after shots, it was quite an accomplishment.
As for rubble, they should be able to handle most of that for you and windrow it, yes. What Jeff is talking about is some larger stones won't come loose if they are smooth or flat, the carbide tips need an edge to bite to kick the stone loose. It will usually loosen these though so they will pop out easily with a digging bar. Depending on how much debris you have, you may have to make multiple passes.
A word of caution however. I have to disagree with Jeff's recommendation of running your machine with less than a full hydraulic tank. This can lead to overheating of the oil, pump and implement. Also something to consider, the only way oil level can have an effect on pressure is if the pump is starving for oil, which isn't good. This will lead to premature failure. The way to control hydraulic pressure is through engine rpm. Sorry Jeff!
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