This paper is based on the planetary gear service life in electric wheel dump trucks. The combination of poor road conditions and low temperatures in winter（minimum-30°C） contribute to the impact load that significantly increases the problem of the planetary gear to be more fragile and reducing service life in the process. Based on the investigation and research of use of large transportation equipment

this paper put forward and adopted the 17CrNiMo6 steel forged

gear-quenched and tempered tooth surface carburizing and quenching process

eventually achieved the ideal using effect in the extreme conditions of transportation

to greatly improve the service life of the planetary gear.