Description
Overview:
This 12V, 40A alternator is a replacement charging unit for plant and agricultural machinery powered by Yanmar TN/TNV-series diesel engines, including the Takeuchi TB016 and Yanmar 3TN. Built with a robust cast aluminium housing and a steel single‐groove V‐belt pulley, it delivers steady electrical output to maintain battery health and power onboard systems such as lights, gauges and control modules. The compact form suits tight engine bays typically found on mini excavators and compact equipment. It replaces key OEM references Yanmar 129240-77200 and Nippon Denso 101211-1380, offering a practical service solution when overhauling the charging system. Designed for demanding site conditions, it supports reliable starts and consistent operation across everyday duty cycles.
Key Features:
- 12V output and 40A capacity for dependable charging across typical engine speeds
- Replacement for Yanmar 129240-77200 and Nippon Denso 101211-1380 references
- Cast aluminium body for strength, heat dissipation and corrosion resistance
- Steel V‐belt pulley for positive, slip-resistant drive in dusty environments
- Compact footprint suited to mini excavators and compact plant engine bays
- Engineered to fit the listed Yanmar TN/TNV applications and Takeuchi TB016
- Durable internal components designed for long service life and stable output
- Supports electrical loads such as lights, controllers, sensors and heaters
- Helps recover battery charge quickly after frequent starts and short runs
- Straightforward like-for-like replacement to restore charging performance
Typical Applications:
Used on compact excavators, small loaders, site dumpers, pumps and generators fitted with Yanmar 3TN and 4TN/TNV engines. Suitable for construction, landscaping and agricultural equipment where reliable battery charging is required for starting, lighting and electronic controls during daily site work.
Also known as:
Charging alternator, belt‐driven charging unit, 12‐volt charge alternator, engine charging unit, plant alternator, AC alternator, machine charging assembly, electrical charging module.
Fits Models:
3TN, 3TNV70, 3TNV76, 3TNV82, 3TNV84, 3TNV88, 4TN, 4TNV84, 4TNV88, 4TNV94, 4TNV98, B22, TB016
Alternate Part Numbers:
129240-77200, 12924077200, 101211-1380, 1012111380
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