PTO pump leaking

Have had a Wood Eze firewood processor in the family forever, has a Prince PTO1 pump to run it, the only rebuilt kit for it half the parts weren’t compatible. I mounted it on the processor itself as on certain tractors the pump just barely goes on the stub as the PTO clutch housing is in the way, think like Oliver 66, Oliver Super 88 and Oliver 1600 if you familiar with them. Bought a piece of PTO shaft from The Surplus Center and slid that thru the entire pump then have a locking collar at each end to keep the shaft in place then have a short Cat 5 pto shaft to run it, worked great for the first couple of cords, now has started to leak under certain conditions.

When the processor sits level, the pump is straight up and down and works fine, when tilting the machine to either load another tree or to keep it level with the log it will start to dribble a little oil out the rear seal and fling it. It’s not sucking air past the seal as there is no sign of foam in the reservoir. When it does start to do the dribble thing though the speed of the chainsaw drops, still has enough pressure to run everything, IE winch, splitter, log lock, chainsaw. Just strange that it doesn’t leak when level, but leaks and looses a little flow when tilted. Can’t see what it matters, but for at least the first forty years the pump was always installed on the tractor upside down, now its right side up and the stamping in it can be read without standing on your head. I’m going to change seals once and see what happens, but it was already a new seal in it. Hate to drop $550 on a new pump as they have changed them enough I don’t think repair parts that are listed for it will actually be the right ones since the reseal kit wasn’t correct either. 

I have a video, at the beginning the log is long and the processor is near level, no leakage whatsoever, towards the end as the log gets shorter the angle of the processor is more until the log is short enough then I pick it up and run level again, about the last cut that is shown the pump had a little leakage and the saw was running a touch slower. Just doesn’t make a lot of sense, when the right side is lower the pickup on the pump is even pointing down a little, when the processor is level so is the hose fitting on the pump.


https://youtu.be/okRG10Fny3U
 

PTO pump leaking