Jeremy That leaf spring gets slightly bent when it is tightened down. That bending action makes it longer or short. This how you set the maximum fuel delivery. Also the leaf spring is usually NOT tightened down all of the way. JD put the shims under the leaf springs so that the fuel delivery could not be turned up after the pump was assembled. Yours not having any shims just means that someone has had the pump apart since it was new. It does not mean that yours is set correctly when tightened down all of the way.
Your screw more than likely was twisted part way off by someone trying to turn the pump up at some time.
There are charts that give you the distance setting for each diameter piston. This is the theoretical flow. The only way to really get it correct is to run it on a test stand.
As for the JD dealer not knowing about the part on Parts Depot. The JD dealer is selling JD parts not Parts Depot parts. So I bet that JD parts does not have any in stock.
Many dealers no longer fool with Parts Depot. Parts Depot sounds like they are great but in reality they are not great to deal with as a dealer. Some things Parts Depot does not tell you. 1) Parts Depot used to have a minimum order amount. Your one screw would not be over this. 2) Parts Depot is NOT real dealer friendly to work with. I have gotten parts from them that where not in usable condition and they gave me trouble trying to return them. Because of this many dealers just do not do business with them. 3) Parts Depot's inventory is questionable on what they ACTUALLY have. I have had them say they have something and place the order. Then they call back and say they do not have it. So I can understand the JD dealer not jumping for joy about a parts order that maybe $10.
The JD dealer knows your part is available through many Stanadyne parts dealers. So they know you can go get the part cheaper/quicker from an injection repair place. So it is not like they are hanging you out to dry. You just need to know where to buy the parts. JD has quit having many of the Rossa-Master parts in their parts system because they sell very few because guys get them direct.
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