The Ariens Emperor 4 3ML4 is a riding lawn mower produced from 1963 to 1964 as part of the Emperor Series. It features a 4 hp Tecumseh V40 gasoline engine with 180 cc displacement, a 4-speed friction disc transmission called Disc-O-Matic, and two-wheel drive with manual steering and mechanical band brakes. The mower has an open operator station and a mid PTO with an independent mechanical idler clutch. Attachments include 26" and 32" mid-mount mower decks and a 30" front-mount blade.