Optimized for tough underground applications, the concrete mixer MK-A12m3 is based on the proven and very durable MK-A35 dumper and provides an extra-large drum capacity for concrete transport in big cross sections. With its front axle suspension and the swivel hinge the dump truck has an optimal ground contact even at high speeds, regardless of whether the vehicle is loaded or empty. With the bi-directional cabin the operator is able to quickly move the truck in both directions, without the need to turn the vehicle in narrow cross sections or tunnels. A trainer seat is optionally available. The proven concept is characterized by a simple structure, robust design and a high service life which is well-proven worldwide.