This comprehensive service manual is a vital resource for professionals and enthusiasts involved in the maintenance and repair of John Deere S550, S660, S670, S680, S685, and S690 STS combines. It offers detailed information and instructions, empowering users to effectively diagnose and resolve a wide range of issues.

The manual begins with essential general information, covering safety procedures, thorough combine and component identification, and comprehensive specifications. This foundation is followed by a focused troubleshooting section, providing clear explanations for diagnostic trouble codes, observable symptoms, and practical solutions.

Delving deeper, the manual provides in-depth coverage of the engine system, encompassing its theory of operation, detailed schematics, and systematic diagnostic procedures. The electrical system receives equal attention, with thorough explanations of general information, theory of operation, accompanying schematics, and in-depth diagnostic approaches.

To ensure complete understanding of the combine's operation, the manual offers comprehensive coverage of drives and hydraulics for all models. This section includes preliminary checks, precise hydraulic specifications, clear explanations of the system's theory of operation, detailed schematics, insightful diagnostics, and component identification.

The main gearcase is meticulously addressed, providing preliminary checks, hydraulic specifications, a comprehensive understanding of the system's theory of operation, accompanying schematics, diagnostics for troubleshooting, and component identification.

Finally, the manual concludes with detailed specifications, theory of operation, schematics, diagnostics, and component identification for the cab and open operator station, ensuring a complete understanding of this critical part of the combine.

This service manual is an indispensable resource for mechanics, technicians, and farm owners, equipping them with the knowledge and guidance to efficiently and effectively maintain and repair their John Deere combines.

The John Deere STS combines are a series of powerful and versatile agricultural machines designed for efficient and high-yield harvesting. The STS stands for "Self-Propelled Threshing," highlighting the combine's ability to move independently through fields while performing the entire harvesting process. The S550, S660, S670, S680, S685, and S690 models within the STS series represent different variations based on engine power, header size, and other features, catering to a range of farming needs and field sizes. These combines are known for their advanced technology, including precise grain handling systems, efficient threshing mechanisms, and user-friendly operator interfaces.

The diagnostic and test service repair manual (TM111919) for the John Deere STS combines provides a comprehensive guide for technicians and operators working on the STS models. This manual is crucial for diagnosing issues, conducting repairs, and ensuring optimal performance of the combine. It covers a wide range of topics, from basic maintenance procedures and troubleshooting techniques to detailed technical specifications and wiring diagrams. The manual includes step-by-step instructions, illustrations, and diagnostic flowcharts, enabling users to identify and resolve problems with precision and efficiency. This valuable resource is essential for maintaining the reliability and longevity of the John Deere STS combine, ensuring farmers can optimize their harvests and maximize their productivity.