1979-1980 Ford 3600 Diesel with Hydraulic Problem. Details Are Below In The Notes?

I have a 1979-1980 Ford 3600 3cyl diesel with a Lehr/Farmhand 22 loader.

The loader worked without any problems what-so-ever before parking it in back in November for the Winter months. Now that it's March & we got a 55 degree day, I wanted to start up the tractor and get some routine maintenance done it… But even thou the tractor started right up, nothing happens when I push or pull either spool valve handle for the loader. I tried the selector valve that pulls in and out that's located below the right hand side of the seat which faces the hi/lo shifter but whether it's in or out didn't make a difference… This is the valve that diverts flow from the 3pt arms to the loader, and when it's pushed in my 3pt arms work like they should and when it's pulled out they don't work and so I know that it has to be pulled all they way out or in the middle for the loader to work. I checked the hydraulic pump and it's still full. I looked all around the under side of the tractor and the ground but there's no leaks.

Is it possible to get moisture in the hydraulic system and it froze up and won't let the hydraulic fluid circulate or something?

Can it be a valve or plug that needs to be removed for having bleed the air out?

Does the pump need primed and if so, how is it done properly?

Any help would be appreciated! Over the years I have become familiar with working on 1960-70's Cub Cadets and 9n/8n tractors but this is my first time owning a newer Ford tractor and a loader. 1979-1980 Ford 3600 Diesel with Hydraulic Problem. Details Are Below In The Notes

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