DEERE made different versions of the pumps, "original" and "serial numbered" replacements, plus some other variations, with control valve components in different locations. The photo in the manual is taken from below, the original pumps had the destroker underneath
If what you are looking at is an Allen head, I don't think it's the destroker. As I recall, some pumps didn't have one at all but it could be added.
If a "serial numbered" or possibly other newer replacement pump the destroker or the port where it can be added is on top of the control valve body, as I recall.
HOPEFULLY someone with a bit more experience than I with the older-series pumps can confirm this.
Here's a drawing of a serial numbered/later pump with destroker screw on top.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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