This manual covers the JCB JS115, JS130, and JS145 Tracked Excavator models, designed for demanding work environments. These excavators are engineered for robust performance and reliability, featuring a Tier 3 emission standard diesel engine and a hydrostatic drive train. With operating weights ranging from approximately 11,500 kg for the JS115 to 14,500 kg for the JS145, these machines are built to handle substantial workloads across various construction and industrial applications. This comprehensive service manual provides essential information for the maintenance, repair, and technical understanding of your JCB excavator. It details critical procedures, troubleshooting guides, technical specifications, and safety protocols necessary for optimal operation and longevity. By following the instructions within this manual, owners, mechanics, and technicians can ensure the continued efficiency and dependable performance of their equipment.