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Message: <blockquote data-quote="73Eldo" data-source="post: 29148" data-attributes="member: 1735"><p>Its an old machine. Looks like the company has been bought and sold a few times. Found what I think may be a distant relative that has manuals on line and their largest model recommends 6-8 gpm. My tractor pto is rated at 40hp so I dont think there is going to be an issue there. Even the 21 GPM at full pressure said it consumes something like 28 HP. Must be the internal gearing that gains some efficiency. I have both 540 and 1100 shafts but the 540's seem to be much more common so I was thinking of sticking with that since all tractors have the 540. Tractor is a diesel so my 540 is at 1800 rpm and that just does not give a very comforting feeling running it that fast. 21 seems like a lot but I will have to look at the charts and do some math to see what I would be getting around 1000 rpm since thats where I tend to run it.</p></blockquote><p></p>