1. XE750D mining hydraulic excavator, as XCMG’s new generation of product, has a reinforced front working device with a rock bucket which has a larger volume; It has adopted the FFTC pilot diesel injection technology, allowing the engine to output power according to actual needs, precisely matching engine and hydraulic system, utilizing engine power to its extreme. Matching degree of engine and hydraulic system rises to above 95%, engine stall has been improved by 30%, and the time engine takes to resume its previous speed has been reduced by 25%, all leading up to faster operating speed, higher working efficiency and lower energy saving. The semi-electric control positive flow hydraulic system adopted for this excavator can automatically coordinate each movement of the working device according to diversified working modes and different operating habits of operators;