RING - BACK UP (Komatsu KO1902-65139)

KO1902-65139: A damaged retaining ring can allow a shaft or bore component to shift, leading to mechanical failure. During disassembly, a back-up ring may appear intact but lose its tension over time. Keeping a retaining ring in sound condition helps maintain axial positioning of assembled parts. This aftermarket replacement references the Komatsu catalog and is cross-referenced to part number KO1902-65139. The ring functions as a back-up seal or stop, preventing lateral movement under load. A worn or broken ring can cause component misalignment and eventual system leakage. Verify the serial number or application, then call (562) 693-7748.

Part number variants: KO1902-65139, ko1902-65139, KO190265139, ko190265139