This service manual provides detailed instructions for the maintenance and repair of JCB Backhoe models 3CX and 4CX. It includes comprehensive procedures for diagnosing, troubleshooting, and repairing critical components such as the engine, transmission, hydraulic systems, electrical systems, and undercarriage. The manual offers step-by-step guidance on disassembly, inspection, reassembly, and adjustments, along with technical specifications and detailed diagrams. It also covers routine maintenance tasks and schedules to ensure the equipment remains in optimal working condition. This document is essential for mechanics and technicians to perform accurate and efficient repairs and maintenance on JCB 3CX and 4CX backhoes.