I am assuming you have the open center system other wise with the pfc system closed center this doesn't work. You need to hook the supercharge line coming out of your aux valve bank into your added valve , go right through while valve is in neutral and back to supercharge line going to mcv pumnp, then have to have a port in valve bank for return flow from valve when in use to return to sump so as not to contaminate super charge line with anything in return flow. A CaseIh dealer should be able to print you a copy of service bulletin S-3436 Dated March 1977 from hydraulic section. It lays it out for you along with options to run an orbit motor. Gets to be kind of a mess but does work.
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