Simple thing you may have done but didn't mention, did you change or check any filters in the system? Not familiar with the 100 hydro, but other IH tractors have a filter on side of case (usually right side, just in front of wheel, under cover held on with thumb screws). A poor filter or any problem there will affect steering first. Also if air in system usually need to turn steering wheels full lock and hold a bit then go other way full lock and hold a bit, to bleed air out. Some things that get overlooked. Had a filter cover that I didn't get on right one time (pinched o-ring) and thoroughly messed up the steering.
Other than that I would suspect the wrong pump was put on at some time, as you say the book calls for a 12gpm and you have a 9gpm on there. Plus you say it gets better with higher rpm (more gpm flow). Paul
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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