This workshop repair service manual covers the JCB JS110, JS130, and JS150LC tracked excavators. These machines are engineered for demanding construction and earthmoving applications, featuring robust diesel engines from Isuzu with displacements of approximately 4.3 L. The JS110 offers approximately 72 kW (97 hp), the JS130 around 77 kW (103 hp), and the JS150LC approximately 81 kW (109 hp). With hydrostatic transmissions and tracked drive systems, these excavators provide reliable performance and operational efficiency. Their operating weights range from approximately 11,500 kg for the JS110 to 15,000 kg for the JS150LC, making them suitable for a variety of heavy-duty tasks. This professional technical manual provides comprehensive guidance for the maintenance and repair of your JCB tracked excavator. It details essential procedures, including engine oil capacity of approximately 12-15 L and hydraulic oil capacity of 150-200 L, alongside troubleshooting steps, technical specifications, and critical safety guidelines. This resource is designed to assist owners, mechanics, and technicians in ensuring the optimal performance, longevity, and safe operation of the JS110, JS130, and JS150LC models.