I ran my first round baler back in 79 with a 730 Diesel. The 70 should be plumbed about the same way. This worked for me as per dealer mechanic instructions at the time. There's two steel hydraulic lines on the flywheel side of the tractor going from the pump to the powertrol. The small one is the high pressure line. I took that line off,cut a short length of it out with a pipe cutter. I threaded both ends with a half inch pipe die. I screwed a half inch pipe coupler on each pipe,then brazed them on because the pipe wall is so thin that you won't have a lot of material left there after you thread it. I hooked a half inch hydraulic hose to each end,ran it in to and out of a single spool two way open center valve with the oil flowing in the direction that it flows from the pump to the powertrol. I made a nice bracket to bolt it to the left side of the cast cowl above the left headlight. Then I ran a pair of hoses off the valve to the back of the tractor with a pair of couplers in a breakaway clamp. I ran the tailgate of the baler off that valve and the twine arm off the regular tractor remote valve. Worked like a dream. The oil flows through that steel line all the time anyway and doesn't care if it's going through an open center valve along the way.
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