• ZF presents the new Ergopower LII HydrodynamicPowershift Transmission
• Newly developed with particular focus on dump truckapplication
• Technical innovations allow higher power transmission with reduced energy consumption
• On board electronics increase reliability and robustness

ZF developed a new Hydrodynamic Powershift Transmission, the ERGOPOWER L II. This unit transmits an engine power of up to 400 kW (approx. 540 HP) and a max. 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 ERGPOWER L II transmission with eight forward and four reverse gears makes the high load carrying job of these machines on off-road surfaces quicker and more economical due to a wide overall transmission ratio, and equal ratio steps allow increased driving speeds at low engine RPM.

Dump trucks are used on large construction sites, sand pits and gravel pits as well as in quarries for moving extremely heavy loads from the mining place to the machining facilities. Most of the time, the large vehicles are operated off-road. Due to their great variety of applications they must have highly flexible drives. For this special usage, ZF Passau GmbH now presents a newly developed hydrodynamic powershift transmission on the CONEXPO Construction Equipment Show which makes dumper operation both quicker and more economical.

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 allows significantly higher driving speeds, with reverse operation of 20 km/h max. being possible at reduced fuel consumption, 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 to all drive axles including the relating traction in off-road application and, if required, is allowed to lock under full load. The possibility of directly mounting an axle drive to the transmission housing ensures an extremely compact design which further allows an independent suspension system in the front frame. Depending on the version, the transmission has up to 2 PTO connections, and the permissible PTO torque is 1,800 Nm.

Manufacturers benefit from the high flexibility which the ERGOPOWER L II offers for installation: For coupling to the engine, the unit features connections for direct mount to the flywheel or for remote mount via prop shaft. All oil lines are located within the transmission. The electronic transmission control is arranged on top of the hydraulic control unit within the same component, directly at the transmission. This drastically reduces wiring expenditure and simplifies logistics: Just one single connector is required to link the transmission to the vehicle. These features simplify the installation in general and increase the transmission’s reliability.