Yes one fill plug, two drain plugs, 80-90 gear oil is fine. It will take almost 5 gallon. The check plug is a small pipe plug by the PTO shaft. For the hydraulic system use universal tractor hydraulic fluid. Capacity will vary as it was changed and you did not give a serial number and if it is a very early one there was a kit that could be added to increase capacity as well. Change the hydraulic filter as well. What kind of alternator is on the tractor? A better description or a picture would help.