I found the following information for your tractor:
If the three point arms cannot be raised by setting the hydraulic
control lever to the "UP" position after long term storage or when
changing the transmission oil, follow these air bleeding procedures.
1. Stop the engine.
2. Set the hydraulic...
Something you can try is to raise and slam the three point arms down a couple of times.
I bought a new tractor last year and the three point quit working. The dealer said to raise and drop the arms. That did not work. The young technician came out and raised and SLAMMED the arms down. It woke...