It would help to know more about it than just "a loader." There are many different loaders that will fit on an H. Most are simple one-way-cylinder, trip-bucket deals, but farmers have been known to throw a curve from time to time and put a more modern loader with two-way hydraulics and a hydraulic-dump bucket on these old tractors. If you have a simple one-way cylinder, trip-bucket loader, all you need to do is hook the hose coming from the bottom of each cylinder to the front Lift-All port on its side of the tractor's "waist," or torque tube. If there are hoses coming from the top of the cylinders, those get T'd together and connected to the hydraulic fill tube on top of the torque tube. The tops of the cylinders are used as reservoirs to hold extra hydraulic fluid because the reservoir in the belly of the tractor only holds like 3 quarts, and would run dry filling the cylinders otherwise. With a more modern loader, all bets are off. It was almost certainly a custom plumbing job using one or two two-way valves, and a maze of pipes and hoses.
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