I posted this to Larry Harsin also, just to expand my options. I have a 1963 550 Oliver that I am adding remote hydraulics to use a light duty vintage Freeman loader. I have a valve that has an adjustable relief valve(set to 1500 or 1700?) May I use the 1/4 pipe port(just right of the filter housing) for pressure and a 3/8 pipe port, just behind and above the 1/4 port for return oil. After testing a bit, I think this will work? I have tapped the ports under the little triangular block so I may plug them if the above mentioned efforts will work. I am doing this routing to keep the area as clean as possible. As it is, it is a bit difficult to mount the little tractor for this old guy. So to you Oliver gurus what can I do? Thanks for the help!