In 1969, John Deere followed its New Generation tractors of the 1960s with a New Generation of combines. These included the 3300, 4400, 6600, and 7700. These models were also the first to come with Quik-Tatch header mounting capabilities as standard equipment. In the 1980s, these combines were followed by the 4420, 6620, 7720, and 8820 that were essentially updated and improved versions of the previous models with larger capacity, a nicer cab, and easier maintenance and service. The 4420 was discontinued in 1984 and replaced by the 4425 combines imported from Germany, and the 6620, 7720, and 8820 received the Titan II updates.