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You are mixing up 2 seperate systems... pull out yer parts manual and look at it. The hyd pump is engine mounted, thus, if the engine is turning.. there is hyd pressure. now.. the pto is not hydraulically powered.. it is mechanically powered from the trannies countershaft.. That is.. on a single stage clutch machine, the tranny stops spinning when you hit the clutch.. as there is no physical contact with the engine. If you had a dual stage clutch or independent pto, clutching the foot clutch does not stop the countershaft from turning, thus letting power back to the pto gears. Since this is a gear to gear relationship.. engine speed will be ratio locked to pto speed. Even if you did find a tractor with a hyd run pto, via a pump and motor hookup, the pto rpm will still be tied to engine speed, as that pump would be a positive displacement device, and it's flow output would depend on engine rpms.. more rpms, more flow.. more flow, more pto rpms... etc. No magic involved in this.. On some newer hydrostatic transmission tractors, you can have variable ground speed with a set pto rpm. They accomplish this by setting the engine rpm, and thus the locked ratio pto rpm, and then for movement, there is a variable flow tranny that changes the volume of oil handles in the transmission.. pressing the pedal gives you full speed.. barely touching it gives you a crawl.. even though the engine is running at the same rpm either way... Soundguy
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