Looking for reliable John Deere 4430 specs? Built from 1973 to 1977, this 125.88 PTO horsepower tractor is still pulling its weight on farms today. This guide covers verified specifications—engine, transmission, hydraulics, dimensions, and electrical—plus serial number locations, model year lookup, and the critical 33109 parts split. You’ll also find a step‑by‑step parts lookup process, common wear items by system, and answers to the most frequently asked questions. Whether you’re maintaining a 4430 or buying a used one, knowing your serial number and transmission type is half the battle. The rest is matching parts by original number or fitment.