According to the JD parts catalog the 2020 was built 1965 to 1971 in Dubuque, Iowa. Many of them used a separate pump for power steering, separate from the radial pump for the main hydraulics. They had a pump in the transmission to operate some optional drive train functions and charge the main pump.
First, below is a link to the online 2020 parts catalog. Below the "Browse Parts Sections" on the page you will see "Documents". There is a document there titled "2020 Tractor: Introduction". There is information in that document to decode your model and serial number so you can select the right manual at the site used red MN posted.
If the reservoir is that low, it will be a good time to drain the sump, clean the screen and change the hydraulic filter. The Operator's Manual will have info on doing these things. Refill with a UTHF meeting the J20C specification. You will want to have 10 gallons of fluid. Use grease to hold the new filter gasket up in the case, don't try to balance it on the housing during installation.
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