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 - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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