I have that same valve on my 100. I have the return line plumbed to the power beyond port. That way, when the valve is centered, there is no pressure on the pressure line and no load on the pump.
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Adam
1964 Model 100 w/ K301 12hp and custom hydraulics
1972 Model 149 turned 129 w/ K301 12hp, triple hydraulics, 66 series clone
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