addition, the engines of the D-series have up to 4 power take-off possibilities at the crank-shaft respectively auxiliary drives. Similar to the B-series, the engine is also available in a horizontal or vertical version. Furthermore, the D-series complies with the strict requirements of the EPA(Environmental Protection Agency) Tier IV final in the US. G-series The G-series is notable for its low weight and ease of maintenance. The air-cooled two-cylinder diesel engine has a power range of 9.8 to 17 kW at a maximum speed of 3600 rpm and a maximum torque of 53.6 Nm. The cylinders are vertically located and may be exchanged individually. The crankcase is made of aluminium alloy. The engines of the G-series comply with the requirements of EPA(Environmental Protection Agency) Tier IV final in the US. M-series The M-series comprises the Hatz engines with the highest performance. Performance data of the air-cooled two-, three- or four-cylinder engines are available for a power range of 15 to 56 kW at a maximum speed of up to 3000 rpm. The maximum torque of the 4-cylinder version is 219.6 Nm. Due to the air-cooling, the engine may be operated under any climatic conditions and assures high operation reliability. In addition, the system scores with better ease of maintenance and may be easier integrated in existing applications. Since July 2013, a diesel particulate filter and exhaust gas recirculation has been available for the M-series in order to comply with the stricter exhaust gas regulations in the US (EPA Tier IV final) and the EU (Stage IIIB). L-series The L-series is mostly identical to the M-series in terms of its design except for the patented SILENT PACK © of the L-series, which reduces the noise level by up to 90% compared to the non-capsulated M-series. The power of the engines, available as two-, three- or four-cylinder versions ranges from 15.0 to 54.2 kW at a speed of up to 3000 rpm. The L-series is also available with a separable diesel particulate filter in order to comply with the current exhaust gas regulation in the EU and the US. Thus, engines of the M- and L-series are the only remaining air-cooled engines with air-cooling in this power class which satisfy the exhaust gas regulation. H-series Since beginning of 2014, a new engine series expands the Hatz product portfolio: the H-series. Starting with the water-cooled four-cylinder engine model 4H50TIC, Hatz relies on common