Rather than using shut-off valves, most would use something called a "selector valve". It is a three port valve that has one inlet and two outlets. Double selector valves are also available for using on two-way cylinders. Either selector valve is used to disconnect one application and send power to another.
I'd be more inclined to set up an additional hydraulic system running off the front of the crankshaft through the crank hole in bolster or off the IPTO as a second choice.
Perhaps the easiest solution is to take one of the existing three circuits and fit quick disconnects at the hose ends. Run hoses from the new implement to connect with the new disconnects.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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