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Excavator parts engine 12V 80A automatic alternator generator Dx60-9 Dx60-7 129908-7720
12V 80A Alternator for Doosan DX60-7/DX60-9 Excavators (OE No. 129908-77200) is a core power supply component for Yanmar 4TNV98/4TNV94 engines. It continuously supplies power to the vehicle’s electrical system and charges the battery while the engine is running, ensuring stable operation under harsh working conditions.
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Product Description
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- OE Part Number: 129908-77200 (replaces 129908-77210)
- Compatible Models: Doosan DX60-7, DX60-9 mini excavators (equipped with Yanmar 4TNV98/4TNV94 engines)
- Electrical Specs: 12V, 80A
- Type: Automotive Alternator
- Material: Aluminum alloy housing + copper windings, vibration and corrosion resistant
- Power Generation & Supply：Driven by the engine belt, the rotor converts mechanical energy into 12V DC power to supply excavator electrical systems (lights, gauges, solenoids, etc.).
- Battery Charging：After meeting vehicle power demands, surplus energy charges the battery to ensure reliable engine startup.
- Voltage Stabilization：Built-in voltage regulator maintains output at 13.5–14.5V, protecting electronic components from voltage fluctuations.
- Overload Protection：Current limiting and overheating protection prevent generator burnout from excessive load.
- Efficient Heat Dissipation：Aluminum housing + vented cover design rapidly dissipates heat, adapting to high-temperature engine environments.
- Single-Groove Pulley：Standard single-groove design precisely matches the engine belt drive for easy installation.
- Integrated Regulator：Voltage regulator and rectifier bridge are integrated at the rear, compact structure with fewer failure points.
- High Vibration Resistance：Reinforced brackets and internal winding fixation withstand severe vibration during excavator operation.
- Used for repair and replacement of the electrical system in Doosan DX60-7/DX60-9 excavators, resolving faults such as insufficient charging, battery drain, dim lights, abnormal gauges, and hard starting.
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