Have you changed the fluid lately?
They can collect moisture, and it doesn’t take but a small amount to freeze in the sump inlet.
That will stop all fluid from flowing till it thaws, those hydro's are pretty much trouble free.
When it is near o* they still work but need warm up time and they are noisy, as is typical of any hydraulic system when cold.
You say the shaft is turning, have you actually checked the rear of the hydro to see if the shaft that is sticking out of the back side of the hydro is turning??
not just the drive shaft between the hydro and the engine.
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