This Service Repair Manual provides comprehensive information for the JCB 446 and 456 Wheel Loaders, with serial numbers starting from 540000 and 539000 respectively. These robust machines are engineered for demanding operational environments, offering reliability and performance in various industrial and construction applications. While specific production years are not detailed, the manual covers essential aspects to ensure these workhorses continue to operate at peak efficiency. This extensive 898-page manual, presented in English, is designed to be an indispensable resource for owners, technicians, and mechanics. It details repair procedures, servicing schedules, technical maintenance, and troubleshooting guidance, supported by actual real photo illustrations and schemes. The content covers critical systems including the engine, transmission, chassis, electrical, hydraulic, and braking systems, along with essential care and safety precautions, enabling effective upkeep and repair.