The smaller crane models LHM 120, LHM 180 and LHM 280 will be equipped with a stage IV / Tier 4final 400 kW engine. The bigger crane models LHM 420, LHM 550, LHM 600 and the new giant LHM 800 are available with a stage IV / Tier 4final 725 kW diesel engine. Both diesel engine versions can be boosted with the Pactronic® hybrid drive system for up to 100% extra power. For the latest European Union emission standard stage IV and Tier 4final of the US Environmental Protection Agency (EPA) respectively, Liebherr has intensively optimised the whole combustion process. Compared with other solutions, Liebherr developed a simple but effective solution that reduces the nitrogen oxides (NOx) emissions while cutting operating costs.
An essential part of the new engine generation is the gas emission treatment. To simplify the system and to optimize exhaust gas after-treatment, Liebherr engineered the Selective Catalytic
Reduction technology (SCR), which reduces particles to a minimum already inside the engine. This leads to economic advantages for the customer: As the particle emissions are already lower than the emission limits, no more reduction measurements are necessary. In this sense, the motor’s characteristics in terms of power, efficiency and economy are further optimized. The newly designed SCR catalyst and all other system components such as injector, air- and AdBlue-pump contribute to a significant NOx reduction of
approximately 98%.
With the stage IV / Tier 4 final, Liebherr offers a standardized basic engine that can be adapted to the emission requirements in different markets and regions by minor modifications or by fitting exhaust gas after-treatment systems. Specifically, that means that the engines in the emission standards Tier 2, Tier 3 and Tier 4 have the same performance, the same parameters for the cooling system and the same interfaces for installation. That enables customers to substantially simplify their machine design by allowing engines with different emission standards to be exchanged in the same machine. That is an important advantage for any equipment that is used all around the world.