Komatsu HM400-3 is a rigid-frame articulated dump truck used in heavy construction, quarry, and earthmoving applications. It is powered by a Komatsu diesel engine and designed for hauling large volumes of material over rough terrain. The HM400-3 features all-wheel drive, a high-capacity dump body, and a suspension system intended to improve traction and ride stability on uneven ground. Common uses include site development, mining support, road building, and bulk material transport. As part of Komatsu's haul truck lineup, the HM400-3 is known for its load-carrying capability, off-road mobility, and suitability for demanding material handling operations.