Ford 1920 PTO Clutch not Engaging

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I've seen plenty of posts where the clutch will not disengage and cannot shift PTO in without grinding or can not get it out of gear.

My problem is like clutch is disengaged. Have no problem shifting into PTO even without depressing Clutch pedal. The pto does not turn after releasing clutch pedal.

Backstory: Was using 3 pt snowblower moving backwards when throttled back and I stopped by depressing clutch fully. Lifted Snowblower slightly, pulled forward (left pto engaged).
Dropped snowblower back down and started moving backwards at full throttle again. But PTO no longer spinning even though still engaged.

I've since removed snowblower. If I engage PTO I get a little detent and chunk like always did. But pto isn't turning after releasing clutch pedal. Well pto shaft is turning but can stop it by grabbing it.
Other shifting is fine, 1995 Ford 1920 with about 580hrs.

Any Ideas?
Kevin

 

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Okay after 3 hrs pushing, pulling and stacking snow with the FEL &. 8' back blade, which would have been much easier with the snowblower, I checked the PTO.
Some how it magicaly works again. Dropped the back blade and reattached the blower and seems to still work under load. Too dark to test much so have to wait till daylight. Need to install some rear facing work lights.
Hopefully it was a fluke and whatever stuck didn't break something or happens again.