Komatsu PC400LC-7 is a hydraulic crawler excavator in the 40-ton class, designed for general earthmoving, site preparation, trenching, and material handling. The PC400LC-7 uses a long undercarriage configuration for improved stability and ground contact, with a conventional upper structure and boom-arm-stick arrangement. It is commonly equipped with a Komatsu diesel engine, hydraulic system, and operator cab designed for excavation productivity and control. Typical applications include construction, quarry work, utility projects, and heavy civil operations. The model is part of Komatsu's PC-7 series and is recognized for its large bucket capacity, digging reach, and machine balance.