***Update***
Ok, I purchased a manual. I also purchased a gasket/o-ring kit for the tractor, as well as the quick disconnects for the aux. valve.
I pressure tested the aux valve and I get up to 2400psi and the detent operates. If I manually override the detent the system relief kicks in at 2500psi. I am using an older flow meter but it says that I am a little over 3 gpm just off idle. This may be a little low, but then again the flow meter is over 30 years old and might be slightly out of calibration. Regardless, that is obviously enough flow to operate the lift arms.
Once I established that the aux. valve has pretty much the correct pressure and flow I can safely deduce the system is ok, up until the point that I use the controls to lift or lower the arms. With this in mind, I removed the aux. valve and replaced it with the stock cover plate. This gave me a port that is directly connected to the lift cylinder to see what is going on. I installed a gauge in this port and operated the lift arms...Nothing...0 psi. With no pressure, I decided to crack the fitting on the cover plate loose to see if I had flow but no pressure...nothing. So, I actually started the tractor with nothing attached to the fitting on the cover plate, and operated the lift and draft controls...still nothing, not even a drop of oil. Armed with this information, I can only assume the valving that directs the oil to the lift arms is somehow defective. I did try one last test. After shutting the tractor off, I used compressed air in the port on the stock cover plate....wala, the arms lifted. They seemed to lift very smoothly. I let the air bleed out, and the also lowered smoothly. With these results in mind, it seems that the cylinder portion of the lift is functioning perfectly.
As stated previously, I did purchase the gasket kit. So, as soon as I get the time when it is not supposed to rain, I will pull the cover.
Has anyone ever seen anything like this, and know what the problem was? (pin fell out, spool stuck, etc.)
This is my first shot with 3 point hitch repair, so any suggestions or comments are welcomed.