Locate the serial number or PIN for John Deere 100 Series on the main frame of the tractor near the left rear wheel. It will appear on a sticker affixed to the frame that reads "Manufactured by John Deere" and be 13 or 17 digits long.
Identify the PIN for John Deere Zero-Turn mowers and EZTrak mowers by lifting up and looking under the seat at the top right-hand area of the frame. The 13 or 17 digit number will appear on a sticker that reads "Manufactured by John Deere."
View the serial or PIN on John Deere Steel-Deck Walk-Behind mowers by looking on the left side of the mower deck frame, when standing behind the machine. The number will be 13 or 17 digits and appear on a sticker with the phrase "Manufactured by John Deere."