From what you describe it sounds like you have the CA type hyd system whereby it runs of the right side of the PTO Belt Pulley - facing front. You have pulled the pump and checked the cyls and they all move properly. Linkage appears to be properly adjusted.
There are four screws on the pump that may be of help. First see that the screw at the bottom of the pump attached to the tracton booster linkage is screwed in. That will deactivate the traction booster system. Then check up top there is a screw that brings the control plates together or separates them. Check to be certain the plates are together. This activtes the hold position. Third there is a screw at the top of the valve assemtly. That should be turned out as far as possible. That will deactivate the delayed cultivator lift feature. Fourth if you go to the front of the hyd pump there is a screw in the front of the pump. Move this out as far as possible so the valve assembly will work freely. If it is out you may want to move it in and out. That could free the valve body and allow the pump to lift.
That is all that can be done from the outside. Other than that you can get into the pump and remove the valve spools. If you do be certain you keep them in diesel fuel or oil since they are so close-fit they could sieze. Be certain the valves move in the valve body freely and are replaced in exactly the same manner in which they were taken out.
Hope that will solve your problem.
Hey, how about that for a 76 year old head who did this type of work 50 - 60 years ago.
Good Luck!
Bill Long
ps: I think this is right but perhaps the experts here could be more specific.
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