Yanmar YM129910-77022 Starter Motor Assembly

The Yanmar YM129910-77022 is a 12V, 2.3kW electric starter motor assembly designed for Yanmar 4TNE94 series diesel engines as utilized in Komatsu forklift applications. It features a 9-tooth pinion gear for engagement with the engine flywheel ring gear. The unit is a direct replacement for Komatsu OEM part number YM129910-77022 and supersedes earlier variants including 129910-77020 and 129910-77023. This starter motor is engineered to meet OEM specifications for cranking torque and durability in heavy-duty industrial environments. It is compatible with engine models including Komatsu 4D92E-1ABW-F, 4D94LE-2Z-AB, 4D94E-1A, 4D98E-1A-TR, and 4D98E-1G46-BM. The housing is constructed from high-strength aluminum alloy with a sealed drive-end bearing to resist contamination. Electrical connections utilize standard M8 terminal studs. The unit weighs approximately 12.5 kg.