i have a 656 that has sat for some time i finally got it running and the 3pt will only go up if i move the hyd remote levers making the system bypass. any ides to what is causeing this?
 
Recently fixed the same problem on dad's 656. The problem for us was the piston in the rockshaft valve. We tried the new o-rings but that didn't work, still seemed to be drag on the piston. Ended up having to by the new piston from IH. The valve is located under the seat
 

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