1. The JOHN DEERE T660 is a powerful combine that offers exceptional performance in the field. With the TM401619 online PDF manual, users can easily access detailed information and instructions on operating and maintaining this machine. This manual provides comprehensive guidance, ensuring that users can maximize the efficiency and productivity of the JOHN DEERE T660. Whether you are a seasoned farmer or a novice operator, this manual will be an invaluable resource for getting the most out of your combine.