NO! Bolt #11 is the one you have to adjust for the second stage.
The bolt you pointed to is engaged by the #12 - Release bearing. It then puts pressure on #3 - Release lever which lifts #2 - Release rod which then lifts #10 - Traction Pressure plate which then lifts #4 - Front cover which releases the second stage clutch #5- Pto clutch disc.
Bolt #11 goes through #10- Traction Pressure plate and the nut will be underneath it. (will probably have to turn the clutch with a screw driver or something to be able to see the adjustment nut)
#9 -Traction clutch disc will be sandwiched between #10 and the flywheel, you will not see it.
While in there you might want to give the zurk on #13 a shot of grease, but not much. (access plate circled in red)
Ok, thanks! When I get home I'll have to see which bolt it is that I'm seeing... The orientation of the schematic has me questioning which bolt it is... I want to say the bolt under the rear cover is the wrong one as I think it is in the same location regardless of what position the flywheel is in...
Thanks for the play by play - very helpful
I'll report back my findings, still crossing my fingers that I won't have to split the tractor