The JCB JS200, JS210, and JS220 Auto Tier3 tracked excavators are robust machines engineered for demanding construction and earthmoving applications. These excavators are designed with a focus on reliability and performance, featuring hydrostatic transmissions and track drive systems for efficient operation. Their substantial operating weight, ranging from approximately 20,000 to 22,000 kg, combined with impressive digging depths of around 6.0 to 6.5 meters and bucket capacities of up to 1.2 m³, make them versatile tools for a wide array of tasks. Powered by Cummins engines, typically the QSB6.7 model, these excavators meet Tier 3 emission standards and deliver approximately 160-175 HP, ensuring ample power for challenging job sites. This Workshop Service Manual provides comprehensive guidance for the service and repair of the JCB JS200, JS210, and JS220 Auto Tier3 tracked excavators. It covers essential maintenance procedures, including engine oil and hydraulic oil filter change intervals, as well as detailed technical specifications for various components. The manual is an indispensable resource for owners, mechanics, and technicians, offering the necessary information to ensure optimal performance, longevity, and safe operation of these powerful machines. By following the procedures outlined within, users can effectively maintain and troubleshoot their excavators.