PHF4F Series Diesel Engine is a four-stroke direct-injection type high-speed diesel engine whose prototype is the new generation product of domestic diesel engine of the same type jointly developed by Ricardo in Britain and Power HF Co., Ltd.. Based on the former R4105G series diesel engine, this series adopts new electronic unit pump technology and enables itself to meet the Stage III emission standard for NRMM diesel engine. Power HF makes a matching design considering the characteristics of a bulk material semi-trailer. By making corresponding changes in some components and parts of the engine, it makes this series an ideal supporting power for large- and medium power construction machines in China. It is strongly universal with large inventory commercially available, rugged and durable, having plenty of accessories. Its reliability and service life have reached the advanced level among those of the like products in China and the top overhaul period is as long as 8000 hours.