Harold, look at neblinc's post up above. I'd try the soaking he's talking about before trying to take that poppet and spring out.
Where you say it hasn't been run in so long (good information), there's a good chance that nothing's broken in there, just stuck in place from years of no motion and lack of lube.
How experienced are you as a mechanic? I ask because the other advice I have can bust something if you're not careful, or even if you think you're being careful. How hard have you tried to force it with the tractor not running? It does sound more like something's stuck, not broken, and the idea is to just free it up.
First, I assume you've tried shifting the PTO into gear either with the tractor running, or while turning the shaft by hand with the tractor off. Just to make sure that the gears have had a chance to mesh and aren't just bumping up against each other.
Second, the Hammer Rule: "Hit it with progressively bigger hammers until you break something, then back down one size."
Read the Hammer Rule over two or even three times, consider the irony, and please keep it in mind.
If it's the detent/poppet sticking, neblinc's idea for trying to sneak some lube in there will help loosen it up. Dwizzle a penetrant in there, several/numerous doses over a couple of days, then try a couple soft blows (I call those "tunks.") in both directions down low on the shift lever with a light hammer. DON'T smack it! You don't really want to move the lever into gear with the hammer blow, just nudge anything that's stuck. Follow that up with some earnest Armstrong tugging on the shift lever, toward the rear as if trying to put it in gear. Repeat several times as required, with adequate time for the penetrating lube to soak through in between.
If you can get it to free up that way, I'd add a quart or more of kerosene through the fill hole on the PTO, which will fill the PTO box and the excess will drain down into the tranny. I'd then run her in place for an hour or two and let the thinned out gear oil splash up onto that shifter and the internal part of the PTO shaft. Over that time, alternate every 15 minutes or so with the PTO in gear, with 15 minutes out. That will help rinse off/lube the parts both in and out of gear.
You should drain the PTO and tranny after that and refill with new gear oil. 5 qts for the tranny plus a pint into the PTO. As long as it's been setting, the oil that's in it now is probably near jelly from condensation, and needed replacing anyway, especially if it's congealed oil and crud instead of rust holding that shifter in place.
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