I don't want to get you you in trouble but, sometimes those screws turn real hard. It's difficult to tell if that spring is bottomed out or it's just that screw turning hard. Only way to know is try turning the other way (counter-clockwise) and see if it moves. If just as hard, then you know it's just the screw.
I'm also wondering if maybe your pump has no shims but is turned all the way?
If you have the JDB633-JD24000 pump, it's already set at near as far as it can go. It's only a pump with two .33" diameter pump plungers and I think it's already set the highest of all the 633 pumps that Deere ever used. Anything more, they jump to a 635 or 637 pump - with .35" or .37" plungers. The "633" on the tag stands for six cylinder and .33" inch plungers.
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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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