The Hyundai Robex 55-7a / R55-7a crawler excavator, part of the 7 Series generation, is engineered for robust performance in various construction and excavation tasks. This diesel, turbocharged machine features a 3.3 L Cummins B3.3-T engine, delivering approximately 62 horsepower and a water-cooled system for sustained operation. Its hydrostatic transmission and 4WD crawler drive provide excellent maneuverability and stability on challenging terrain. With an operating weight of around 5370 kg and dimensions suitable for compact job sites, including a digging depth of approximately 3.6 meters and a max reach of 5.7 meters, this excavator is designed for efficiency and reliability. This Full Service Repair Manual in English provides comprehensive guidance for maintaining and repairing the Hyundai Robex 55-7a / R55-7a crawler excavator. It covers essential areas such as detailed maintenance procedures, troubleshooting common issues, and in-depth technical specifications for all major systems, including the engine, hydraulics, and undercarriage. Safety guidelines are also included to ensure proper operation and prevent accidents. This manual serves as an indispensable resource for owners, mechanics, and technicians seeking to optimize the performance, longevity, and operational safety of their equipment.