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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