Nabtesco ES24163 2nd Sun Gear

This 2nd sun gear is a critical planetary component within the Nabtesco GM18 travel motor final drive assembly. It is manufactured from high-grade alloy steel with carburized and hardened heat treatment to withstand high contact stress and cyclic loading in hydrostatic drive systems. The gear features 16 teeth with a 26 mm inner diameter, 56.5 mm outer diameter, and 64.5 mm overall height. It meshes directly with the 2nd stage planetary gears to transmit torque from the hydraulic motor to the output shaft. Dimensional precision ensures proper backlash and load distribution across the planetary stage. Primary applications include Komatsu PC100-5, PC120-5, PC100-6, PC120-6, PC130-6, PC130-7, and PC160-7 hydraulic excavators equipped with Nabtesco GM18, GM18VA, GM18VL, or GM18VN travel motors. Cross-references Komatsu OEM part number TZ269B1015-00.