This workshop service repair manual covers the JCB 8025Z, 8030Z, and 8035Z excavators. These machines are engineered for demanding applications, offering robust performance and reliability. This manual is designed to provide comprehensive information for the repair, maintenance, and adjustments of all vehicle components, ensuring optimal operation and longevity. This English-language manual details the design, function, disassembly, adjusting work, and troubleshooting for these excavator models. It includes step-by-step procedures, explanations, pictorial diagrams, special notes, service data, safety precautions, wear limits, torque values, and diagnostic information. The manual is intended to assist owners, mechanics, and technicians in performing all necessary service operations, emphasizing the use of genuine JCB parts and approved lubricants.