The JD control valves are likely setup for closed center and odds are 99.999999% that the aux pto pump is open center. The valves maybe convertible to open center and a relief pressure of 2250 set. Some of those JD backhoe valves have relief valves incorporated into them. What kind of tractor is the backhoe mounted to? If it's a deere an aux hydraulic pump is not required. The tractor will have more than sufficient capacity in flow, cooling and storage. What size pump, tank and cooler have you purchased?
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