Doosan K1007357B Swing Gearbox Assembly

The K1007357B swing reduction gearbox is a planetary drive unit designed for 14-16 metric ton class hydraulic excavators. It converts high-speed hydraulic motor output into low-speed high-torque rotation for the upper structure slewing function. The assembly integrates a multi-stage planetary gear train within a hardened steel housing with flange mounting interface. Compatible with Doosan, Daewoo, and Komatsu branded excavators sharing common undercarriage architecture. Cross-references include Doosan 401-00003B, 404-00062, 2404-1066A, and swing motor assembly K1000101 / 170303-00001. Service life rated for continuous heavy-duty excavation cycles with standard gear oil lubrication.