The JCB JS115 Auto Tier3, JS130 Auto Tier3, and JS145 Auto Tier3 models represent robust construction equipment engineered for demanding applications. These machines are built with a focus on reliability and performance, incorporating Tier 3 compliant diesel engines designed to meet emission standards while delivering efficient power. Their advanced "Auto" features and durable construction make them suitable for a wide range of heavy-duty tasks in construction, mining, and infrastructure projects, ensuring productivity and operational longevity. This Workshop Service Repair Manual provides comprehensive guidance for the JCB JS115, JS130, and JS145 Auto Tier3 excavators. It covers essential areas including general information, care and safety, detailed maintenance procedures, body and framework, electrical systems, hydraulics, transmission, track and running gear, engine service, diagnosis, testing, adjustments, and troubleshooting. With step-by-step instructions, detailed illustrations, and clear diagrams, this manual is an indispensable resource for owners, technicians, and mechanics to ensure the proper upkeep and repair of these powerful machines.