Abstract: A dump truck including a suspension system and a steering system. The suspension system includes a frame and a plurality of hydraulic suspensions, and every two of the hydraulic suspensions are aligned on one axle. The suspension system includes at least two axles. The frame includes a middle box beam and spars protruding from two sides of the middle box beam. The hydraulic suspensions include a pivotal bearing, rotating frame, swing arm, hanging cylinder, oscillating axle, and wheels. The upper end of the rotating frame is arranged in the lower surface of the spar of the frame via the pivotal bearing. The upper end of the rotating frame is non-rigidly connected to the swing arm. A cylindrical pin is disposed at the front end of the swing arm. The cylindrical pin is sleeved in a pinhole of the oscillating axle.