When I got my quick hitch and blade for my X495 a 90 degree hydraulic fitting that was an adjustable valve. Instructions told me to remove the straight elbow from just before the hydraulic box and replace it with this adjustable valve. I have no idea what that valve is for. I don't know if it is supposed to be open or closed for regular blade up/down left/right operation and I don't know if it should be open or closed for routine mower operation in the summer. In fact the valve doesn't seem to have stops in the open position so it will fall apart if I open the round control nut all the way out. PLEASE help me understand what this is, what position it should be in and to what degree it should be open or closed for varying operations. Right now I have it open and the right/left operation of the blade is delayed but once it starts to move all is fine. Help please.