I have a Ford 1320 with a hydraulic leak. Oil leaks from the tube between the HST filter and the transmission case. I put a new "O" ring on the line where in fits into the case but still leaks while running and static. I put a washer between the line and bracket that holds it in place to make it fit tighter. It seems to cavitate as it warms up and the bucket becomes almost unusable. Bought this at auction ran great for a while then developed the oil leak. Any help as to where the oil leak is coming from greatly appreciated