This comprehensive manual covers the A 900 C Litronic EDC, A 904 C Litronic EDC, A 914 C Litronic EDC, A 924 C Litronic EDC, and A 924 C HD Litronic EDC hydraulic excavators, starting from specific serial numbers. These powerful machines are engineered for demanding construction and earthmoving applications, known for their robust design, efficient operation, and reliable performance in challenging environments. Their advanced Litronic EDC control systems ensure precise operation and optimized fuel consumption, making them valuable assets for any project. This extensive 2979-page document serves as an essential resource for owners, mechanics, and technicians. It provides detailed information across a wide range of systems, including general information, tools, technical data, maintenance guidelines, engine, hydraulic systems, electrical systems, braking, and more. By following the procedures and guidelines outlined within, users can effectively perform routine maintenance, diagnostics, and repairs, ensuring the longevity and optimal performance of their hydraulic excavators.