This workshop repair service manual covers the JCB JS160, JS180, and JS190 Auto Tier3 tracked excavators. These machines are engineered for demanding construction and earthmoving applications, featuring robust construction, reliable diesel engines with common rail fuel injection and Tier 3 emission control, and efficient hydrostatic drive trains with planetary gear reduction final drives. The JS160 has an approximate operating weight of 16,000 kg, the JS180 approximately 18,000 kg, and the JS190 approximately 19,000 kg. Notable features include variable displacement piston pumps and travel motors for precise hydraulic control, pilot-operated joystick controls, and pressurized cabins for operator comfort. This manual provides comprehensive guidance for the maintenance, repair, and technical understanding of your JCB excavator. It details essential procedures, including engine oil and filter changes, hydraulic system servicing, and undercarriage maintenance such as track tensioning. Technical specifications, fluid capacities, and troubleshooting information are included to assist in diagnosing and resolving issues. By following the instructions and guidelines within this manual, owners, mechanics, and technicians can ensure the optimal performance, longevity, and safety of their JS160, JS180, or JS190 Auto Tier3 excavator.