Shimming the spring will only help if it is relieving pressure too soon. At this point you really don't want to be guessing at such things. The shop manual will tell what the pump pressure should be. They typically run around 1200PSI.
Sometimes you can hear the relief valve when it's open, the sound it makes when the steering is turned hard against the stop and the pump begins to howl. If it's making the howling sound before the steering is against the stop, increasing the pressure might help, again best to test, not guess.
If the pump never goes into relief, that is a sign either the pump is weak, the cylinder seal is bypassing, or the directional valve is not sending full fluid the direction it needs to go.
Other factors could be binding in the steering, dry bushings, metal to metal bushings, bent components, or if there is a front loader it will make for very high demands on the steering.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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