Komatsu 201-30-00012 Front Idler Assembly

Technical engineering specifications for Komatsu front idler assembly part number 201-30-00012. This component serves as the front track guide wheel maintaining proper track tension and alignment on hydraulic excavators. Manufactured from forged alloy steel with induction hardened tread surfaces to resist abrasive wear and impact loading in excavation applications. The assembly integrates a sealed bearing cartridge with duo-cone floating seals to exclude contaminants and retain lubricant under high rotational speeds and shock loads. Precision machining ensures concentricity and dynamic balance reducing vibration transmission to track links and roller frames. Direct bolt-on replacement for OEM part numbers 201-30-00012, 201-30-00011, and 201-30-00010. Material composition, heat treatment parameters, and dimensional tolerances conform to Komatsu OEM engineering standards for PC60-5, PC60-6, PC60L-5, PC60L-6, PC60U-5, PC70-6, and PC70-6S model series.