Not sure where else to post this, the farming subs are more "mini tractor" kind of people.

I got a sickle blade mower that has a single acting hydraulic cylinder that only lifts the blade, it falls under gravity.

The tractor hydraulic remote has two ports and a two way valve (momentary in each direction center neutral). The problem is that the mower just constantly drifts down when the control is in neutral. There's no way to keep it up other than jogging the valve constantly.

I know little about hydraulic terminology. Does this mean that the valve on the tractor is "open center"? Is it possible there's an adjustment on the valve to make it hold pressure on one side when in neutral and release it when you move the opposite way? Or do I need a whole new valve?

I can't really imagine a scenario where it would be OK for the hydraulics to "freewheel" whenever you let go of the handle. Is something broken or is this by design?

Anyway if anyone has any insight or resources I'd appreciate it.

Edit pictures https://photos.app.goo.gl/LA8AZ8bP1mbSUGqt6

Edit: Solved! RTFM situation. The manual made a reference to a screw that can be turned to switch to single-ended operation. But it wasn't a screw and it wasn't where the manual showed it to be. But I found a lever on the bottom of the valve that switched the operating mode to single-action and now it holds pressure until moved in the other direction.