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 - Running Beans in East Central Indiana - by The Red, John Fritz. Fall is my second favorite season behind the long days of summer. The calendar reads late September and it�s time to start running beans. This article is about my experiences helping my farm neighbor Ernie Swoveland, along with his grandsons Jeff and Craig Ring, with the soybean harvest in East Central Indiana for the 1999 season.
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