The Komatsu HM400-2 is a robust articulated dump truck designed for demanding heavy-duty off-highway applications, including mining, construction, and quarrying. Produced in the mid-to-late 2000s, this model exemplifies Komatsu's commitment to engineering quality and reliability, featuring a powerful diesel engine, a durable articulation hitch for superior maneuverability, and a high payload capacity for efficient material transport. Its design prioritizes durability in harsh environments and operator comfort through an ergonomic cab with excellent visibility and climate control, making it a strong contender in the large-scale earthmoving equipment market.

This Operation and Maintenance Manual provides comprehensive guidance for the Komatsu HM400-2 articulated dump truck, covering serial numbers A11001 and up. Its purpose is to serve as an essential resource for safe and efficient operation, detailed preventive maintenance, and routine repairs. The manual offers full coverage of operational procedures, maintenance schedules, and troubleshooting, along with in-depth diagnostic procedures, component identification, and detailed safety precautions. It is structured to assist owners, mechanics, and technicians in maintaining the optimal performance and longevity of the vehicle.