You have just been introduced to the number one hydraulic problem on that type of IH tractor. Loss of prime in the MCV pump and not able to pick it up on it's own.
This problem occurs when the O-ring seal between the center section and the rear frame ages and takes a set so that it can no longer form an air tight seal. This seal is located above the normal oil level in the transmission. When the tractor sits without being used air slowly leaks into the suction side of the front hydraulic system. The hydraulic pumps are not very good good pumps for pumping air and when they get worn they are even less effective. You have one more issue that causes the tractor not to move on it's own and that is a worn sprag in the low side of the TA. There are little drag clips on the sprag clutch that are designed to help the clutch engage. These tend to break off with use and without them the clutch will sometimes not engage. When the MCV pump is providing lube oil to the TA the oil provides enough drag that the loss of the clips is not always noticeable.
The correction for the all the problems is to split the tractor and replace the TA and MCV pump. The work-around is to prime the MCV pump and see how everything works.
To prime the pump start the engine and then turn the steering wheel. If that doesn't work, and it usually doesn't, remove the plug on the back side of the MCV assembly that is located below the dump valve spool. It is the only plug there that has a 5/8" head. Start the engine and be ready to shut it off quickly. When it primes it shoots oil back on the rear axle and it sprays all over. If you still can't get it to prime you will need to add a little air pressure to the oil fill hole as you are trying to get it primed.
If after it is primed everything works OK you're good to go. If you find that the tractor loses prime between uses you can add an extra five to seven gallons of transmission oil to keep the oil level above the leaking seal. That will eliminate the loss of prime in the MCV pump.
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