ZF has developed a Hydrodynamic Pow-ershift Transmission, the ERGOPOWER L II that transmits an engine power of up to 400 kW (540 hp) and a maximum input torque of 2,500 Nm without interrupting the tractive force, thus being specifically designed for application in dump trucks of up to 50 tons payload. The ERGOPOWER L II has eight forward and four reverse gears which increase the overall transmission ratio from 7 to 11 versus previous dumper transmission generations. This makes high-load carrying on off-road surfaces quicker and more economical due to a wide overall transmission ratio and equal ratio steps which allow increased driving speeds at low engine rpm. Fuel consumption is also reduced since the increased transmission ratio reduces the engine speed by up to 15 percent. The ERGOPOWER L II changes gears without interrupting the tractive force, and the electronic control ensures optimum gear steps. The integrated primary retarder offers a very efficient brake performance which can fully replace the service brake even at low speeds, thus preventing wear. With a torque distribution of 1:2, the longitudinal differential provides the necessary power new X62 to all drive axles including the relating traction in off-road application and, if required, is allowed to lock under full load. Manufacturers benefit from the high flexibility for installation.
