Admitting here I was an industrial machine repairman/machinist, during my career (retired now), and have a modest training, and experience with hydraulics, and some of its theory, but I am no expert on it all...
We had a problem on ours and it turned out to be the directional valve sticking.
Taking the valve out, there is a number etched into it.
From there, a Google search led me to the part, and the mfr.
Then at mfr's site, found a dealer, an industrial supply chain like Grainger, or something, you may find the part is only $40.
That's what happened to me, but they did not keep the Deltronics part on hand, and Deltronics had a $75 minimum order to my supplier, so I had to purchase them both.
But, if you have the determination to get your hands dirty, spill some oil, you can get it figured out.
Good luck...
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