8N hydraulics locked up high.

if it is.. then exhaust valve must be plugged up.

Drain oil, flush / clean sump.. replace oil... remove corner test port.. oil should shoot out and drop lift arms... start her up and see what you get.

If that don't do it.. be planning on dropping the pump to pull the valve for cleaning..

Soundguy

90wt gl1 or 2 mineral gear oil..

napa sells it as # 65-205 90w gl1

TSC sells it in a pail calling it ford transmission oil 1939-1952

You can also use a 80w or 90w gl5 or 5 oil that is yellow metal safe. Castrol and penzoil both make a version. the penzoil is called gearplus

Also.. you can use a modern UTF type fluid.. one that is compatible with CNH spec M2C134D

if your hyds are weak or leaky.. they will be worse with the utf oil. If they are slow in a cold climate. they will be faster with UTF.

price is about the same either way.. as you will need about 5g to do the job..

Soundguy