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If the fluid is so bad that the hydraulics aren't working right, it's too late to change it. The damage is done. Changing it on a regular basis is always a good idea, but it's a maintenance item, not a repair item. Just checking the pressure is only telling you half the story. You need to have the hydraulics flow rated to see if the pump is putting out the GPMs it's supposed to. GPMs, not PSI, is what makes the loader move fast or slow. The hydraulic pump is the most likely culprit. You may have a problem in the valve stack, though. What that problem is, I don't know, and there is no way to know without having an expert take the entire thing apart and diagnose it, IMHO. You can start blasting away with the parts shotgun if you really want, replacing all the orings, seals, the relief valve, screens, etc.. AFAIK there is no "rebuild kit." Have you ever tried to move the 2pt hitch while raising the loader? These tractors were designed to have one hydraulic operating at a time. When you open a second valve, the oil follows the path of least resistance. The loader's weight pushes the oil backwards into the hitch in this case.
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