If this wasn't a OEM Gravely hydro filter, Take it back off and look inside the smaller holes for a anti-drainback valve (a rubber disc just inside of the holes).
Just because a filter is the same size and same threads doesn't mean it will work, A engine oil filter With drainback valve will not work in a hydro oil system...... The hydro system must have a free flowing filter without a drainback valve......
Originally Posted by piston slapper
You never learn anything until you admit you don't know it all...
"Why go out preserved when you can go out beat up, worn out, sliding in sideways screaming, Holy Sh!t What A Ride" !!!