Not fact, sorry. Not universal fact anyway. What about the tractors (mine) that already put out their rated 2500 PSI at 1100-1200 RPM? Bypass, that's what! Once the bypassing starts, GPM - and therefore splitter cycle speed - becomes a constant.
//greg//
You have a grave mis-understanding of how the hydraulics work then.
The PRV valve does NOT open until you reach that 2500 PSI. And if the pump were 100% efficient, you would make 2500PSI even a 1 rpm.
So the fact that you make max PSI @ 1100rpm is irrelivent. That doesnt mean your PRV is open. It is actually closed and making very little PSI because it is returning via the valve being in neutral. (open center).
And once you start splitting wood, unitl you have a peice tough enough to just about stop you cold, the PRV is STILL closed. Once it is open, USUALLY ALL of the fluild will bypass. Path of least resistance thing. If your PRV is open just because you have reached 1100rpm, you woudnt split anything.
Um, I'm pretty sure that's what I wrote. Except you're taking "load" out of context. Given that experienced tractor owners know that the hand throttle is there to produce sufficient RPMs to handle the load they're placing on the engine, I was simply relating RPMs relative to engine load. By the way, are you aware that very few - if any - new tractors use a tach cable anymore? I'll admit to never even having seen one, although I've seen a few that use oil pressure as an hour meter trigger. Others (like mine) employ magnetic sensors that count turns at the ring gear. On diesels anyway. What few gasoline tractors are being sold anymore, pick up revs at the distributor.
Lighten up.
//greg//
I thought that is what you meant. But the way it is worded, "load" and "rpm" cannot be interchanged and mean the same thing.
A reving tractor @ WOT has almost NO load, but a lot of RPM's.
A tractor @ 1200rpm's running a post hole digger has a lot of load, but not many RPM's.
And tractors may well indeed NOT have tach cables. My point was that the hours are based on the tach. IOW, hours is a direct relation to how many revolutions the engine has made. and NOT how many hours it has actually ran.
PS, my 3400 does indeed have a tach cable. As well as the 2800, 3700, and I also believe the newer 3200/3800's.
And I am being light. I just dont like inaccurate or mis-represented information, so I thought I would clarify.:thumbsup: