This John Deere 9540, 9560, 9580, 9640, 9660, 9680WTS, 9780CTS /i Diagnosis and Tests Manual (TM4937) is an essential tool for owners of John Deere 9540, 9560, 9580, 9640, 9660, 9680WTS, 9780CTS /i Combines. This manual provides detailed illustrations and step-by-step instructions to diagnose and troubleshoot your machine. It is an inexpensive way to keep your vehicle working properly and includes high quality images, circuit diagrams, and diagnostic procedures. The manual is in an electronic format, allowing you to print out the page you need and dispose of it when you are done. Learn More