Komatsu PC400 is a hydraulic excavator in Komatsu's large excavator class, used for earthmoving, mining, quarry, and heavy construction applications. The PC400 series is designed for high digging force, strong lifting capability, and efficient material handling in demanding site conditions. Typical configurations include a diesel engine, hydraulic boom and arm system, crawler undercarriage, and operator cab with controls for excavation and loading work. The model is commonly selected for bulk excavation, trenching, site preparation, and truck loading. Exact specifications vary by variant, year, and regional market, including operating weight, engine output, bucket capacity, and transport dimensions.