What is the year of 310A john deere backhoe serial number 310AD 276538T?

The serial number 310AD 276538T indicates that this JOHN DEERe backhoe is a model from the 310A series, which was produced in the early 1980s. Specifically, the "A" in the model designation typically signifies a production year around 1980-1981. For a more precise manufacturing date, you may need to refer to John Deere's production records or consult a dealer with access to their database.