Here's how to install the mower deck on your 300 series John Deere garden tractor. It's a little more involved than recent models, but it's not too difficult once you see how it works. This will work on the late 300 series machines, and it is almost the same for the early ones. (300, 312, 314, 316K, 317, etc.) If anything wasn't clear feel free to comment or ask questions, and thanks for watching!