Charles, Not sure what your model is but it sounds similar to the hydraulics in my 2606. The relief valve is under the seat under the cover of the draft control housing on the right front corner as you are sitting. I priced one at $234 from cih. Mine had a piece of metal holding the ball open. It is technically adjustable but on the top inside there are 2 machine pressed staked pockets in the thread and nut. You would need to clean up the threads and the nut with some fine tools to be able to screw it in a little at a time to increase the psi. The relief valve is open topped so any fluid coming out comes straight up against the cover. There is pipe plug on the left front inside the housing (or in the back if you have the draft control rock shaft inside) that you can remove to lower the level and clean out the sludge in the bottom. You can screw out the relief valve, run it and watch the flow of fluid. The relief valve for the power steering inputs just to the left of where the main psi valve screws in.
I'm not sure raising the psi will help that much but maybe some. As a pump wears out it not only produces less volume but it also isn't as tight so you also have less pressure. The less volume = less psi flowing down the same size pipe(basic law of physics).
I think you still may have a relief valve and/or check ball problem with the flow divider and the pilot valve attached to it if you are also having some steering problems.
Mine has a case 33 backhoe & a IH 3000 loader so it has the two largest pumps you can get, the 17 and the 9. From what I see in the parts manuals, the larger pumps are interchangeable without having to put in bigger lines or valves, etc. Mine also uses the standard hyd filter and not the high capacity filter which is about 1 1/4" thicker. A high cap filter would not fit into the housing. New tractors and even some bobcats have fairly high gpm pumps. I don't see any drawbacks with a 17gpm pump since the system was designed to use them.
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