Abstract: The gear transmission system is a core component that ensures the proper operation of open-pit mine vehicle reducers. To address the poor performance of traditional systems, this study proposes a new automated gear transmission system for open-pit mine vehicle reducers. Experimental results show that in simulation experiments, the average stress and absolute deviation of the proposed system are 451.07 MPa and 11.46 MPa, respectively, while those of the dual-planetary system are 484.18 MPa and 13.69 MPa, respectively. The average fatigue life and absolute deviation of the proposed system are 1.00 × 10⁴ h and 0.017 × 10⁴ h, respectively, while those of the dual-planetary system are 0.94 × 10⁴ h and 0.020 × 10⁴ h, respectively. In actual performance experiments, the average transmission efficiency and absolute deviation of the proposed system are 91.28 % and 0.86 %, respectively, while those of the dual-planetary system are 87.94 % and 1.07 %, respectively. The proposed automated transmission system improves the stability and efficiency of gear transmission, enhances the operational performance and reliability of open-pit mine vehicle reducers, and helps ensure the safe operation of mining activities.