Well now, wasn't the hydraulics on the tractor. I swapped the hoses to the other circuit which I knew was working, and the door's cylinder still wouldn't move. I took the cylinder off the wagon & into the shop. The ram was stuck solid. The cylinder seal cap's retaining clip was broken, making it impossible to get the cylinder apart. But as I was working things trying, the ram suddenly wasn't locked. I had tried prying, hammering on a pin through the clevis, and nothing worked, then it more or less comes loose almost on it's own. There must have been something lodged between the cylinder wall & the piston, but all I know is it now works fine. I manually worked the ram in & out many times as fast as I could, hoping whatever the foreign object was, that it got blown out. Didn't see anything though. Anyway, it's back on the wagon & working perfectly.
Let momma cow out, then moved the calf to a pen. Calf is kind of weak, so it'll need some TLC. Then I got my Massey 1655 diesel out & used the loader to place several molasses lick tubs in the concrete silage feeders. Then I figured the garden was dry enough to spread out the huge compost pile. Almost finished when Teresa hollered dinner time. So I'll go finish that in a few minutes.
Turns out not too bad a day so far.
Is it possible that some water got in somewhere and froze to cause this issue?