The JCB 3CX 4CX Backhoe Service Manual (290000-400000) is a comprehensive guide covering the servicing, maintenance, and repair procedures for JCB 3CX and 4CX backhoe loaders within this serial number range. It provides detailed instructions, diagrams, and technical specifications to help technicians perform accurate diagnostics and efficient repairs on key systems such as hydraulics, engine, transmission, and electrical components. Essential for maintaining the performance and reliability of these machines.