if you are using Pioneer tips on the hoses and coupling into the IH tips on the tractor the problem may be with the couplers. the IH couplers have a cone with a flat pin type end and the Pioneer ends use a ball. When they start to get worn the flattened tip slides off to the side of the ball when coupled and that allows the ball to partially close. That causes a restriction in one direction but the ball will be opened by hydraulic flow in the other direction. If you can push the cone with pin off to the side as you push in on it, that most likely is your problem.
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