Both the original three spool valve and the new one are/were convertible. Problem occurred with the old valve too.
I am thinking there is something wrong with the tractor side of things.
Would a clogged or partially clogged filter or screen do something like this. Why would you have to feather the valve it it work okay, except for down. When moved to full stroke of valve the hydraulics DIE. Like something is telling the front pump not to pump at all.
When at 1900 standby the front pump does go quiet.
Thanks for any input/help. Will remove return hose and check for flow, but do not believe there is any as front pump goes quiet.