GEAR - FLYWHEEL RING (Komatsu KO51-500)

KO51-500: A damaged flywheel ring gear can prevent the starter from engaging the crankshaft, leaving the power unit unable to rotate. This aftermarket replacement part references Komatsu as the OE maker and carries the cross-reference part number KO51-500. The gear is a toothed ring that the starter pinion drives to initiate rotation of the crankshaft assembly. A worn or broken ring gear typically causes a grinding noise or complete failure to start during cranking attempts. In a repair setting, a missing or chipped tooth on the ring gear will stop the starter from meshing properly. The item ships at approximately 2.85 pounds. Verify the serial number or application, then call (562) 693-7748.

Part number variants: KO51-500, ko51-500, KO51500, ko51500