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Joe: I can't be 100% sure on this, but here goes with an opinion. Am I correct in assuming hose on A returns to transmission? If so that hose was only ever put in place to pickup or discharge oil so port B could be used for single action hydraulics. Are there any other ports on the valve with just a plug in them? I am not very familiar with the utility type tractors, most of my experience was with Farmalls. Every auxilary valve must have 4 ports for double action and 3 for single action. Most valves of that era were all equiped for double action. Those 4 ports being supply, discharge back to resovoir and two ports for double action cylinder. On the Farmalls of that era all you needed do for single action was plug into the lift side, with cylinder and when you wanted to lower implement you moved lever to float position. It looks to me as though someone has put quick coupler for single action on lowering side of valve on your tractor, thus he could not use float position for lowering a single action cylinder. To make this work, he then had to plumb port A back to transmission so it could pickup or discharge oil as needed. If my opinion is correct there is only one thing I don't see, that being a return line to transmission or resovoir. Could it be in base of valve where it bolts to tractor. Why not try plumbing the double action cylinder into ports A and B. While you do this just place that hose currently hooked to port A, so it can't discharge oil particularly all over you. Start the tractor long enough to see if valve lever will extend and retract cylinder, That is providing you don't get an oil discharge from that disconnected hose from A. Take notice if tractor labors as if under load. Then come back to me, let me know your findings. My thoughts are you can eliminate that hose from port A to transmission.
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