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 - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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