1. The JOHN DEERE 8400 Forage Harvester TM407019 is a reliable and efficient machine designed for harvesting forage crops. This online PDF manual provides comprehensive instructions and detailed information on how to operate and maintain the harvester effectively. With its powerful engine and advanced features, the JOHN DEERE 8400 ensures high productivity and superior performance in the field. Whether you are a professional farmer or a hobbyist, this manual will be a valuable resource to help you get the most out of your forage harvester.