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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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