Komatsu 20T-30-00120 Idler Assembly

The 20T-30-00120 idler assembly is a critical undercarriage component designed for Komatsu mini excavators. It functions as the front idler, guiding the track chain and maintaining optimal tension during operation. This assembly includes the idler shell, shaft, brackets, and sealed bearing group engineered for contaminated environments. Constructed from high-strength alloy steel with induction-hardened running surfaces, the unit resists abrasive wear from soil, rock, and debris. The sealed-for-life bearing design excludes moisture and contaminants, extending service intervals. Direct OEM replacement ensures correct track pitch engagement and alignment with carrier rollers and sprockets. Compatible with both rubber shoe and steel shoe track configurations.