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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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