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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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