English
This alternator is engineered for a wide range of Caterpillar AG & Industrial excavators, covering models from 311, 312, and 313 series to the 320, 321, 32,3 and 324D series, as well as the Kobelco 140SR-3 equipped with the D04FR engine. It is compatible with OEM references including 12748N, 12748, 10R-2576, 2128561, 5I8085, A004TU3586, and 34368-02300, ensuring consistent fitment across machines produced between 1992 and 2016.
Manufactured at 24V and 50A with a 2-groove 82mm pulley, this alternator is built using fully new components rather than reassembled parts. The construction emphasises stability under continuous load and dependable charging performance for excavators operating in earthmoving, construction, and industrial environments.
The housing, rotor, stator, and internal rectifier elements are produced to match the performance requirements found in the original Caterpillar and Mitsubishi designs. Voltage output remains stable under varying engine speeds, supporting reliable battery charging and electrical system supply on machines equipped with engines such as Caterpillar 3064, C4.2, 3046, 3066, C6.4, C6, and C7.
The alternator is built to align with structural dimensions and mounting configurations used on the targeted Caterpillar chassis, allowing direct installation without modification. The internal regulator and protective components are selected for long service cycles, maintaining charging efficiency in applications exposed to vibration, dust, and extended operating hours.
Produced by SANYOU, this unit meets or exceeds the operational standards of the corresponding OEM references. It offers a performance level consistent with original factory alternators, providing stable electrical output for excavators throughout daily use and heavy-duty working conditions.
Mounting Dimensions
Specifications
OEM NO.
Applications
| Specifications | MFR | MITSUBISHI |
| Voltage | 24 | |
| Amp. | 50 | |
| Grooves | 2 | |
| Pulley | 82 |
| WAI | 12748N |
| LESTER | 12748 |
| CATERPILLAR | 10R-2576, 2128561, 5I8085 |
| MITSUBISHI | A004TU3586 |
| MITSUBISHI HEAVY INDUSTRIES | 34368-02300 |
KEEP IN TOUCH
Our factory specializes in producing starters, generators, and spare parts for automobiles, tractors, and internal combustion engines. We possess advanced production and processing technology, complete equipment, and rigorous testing methods. Through years of hard work and entrepreneurship, we have gradually developed into a company of considerable scale and strength. Our "Xiyun" brand has gained considerable influence in the industry, and our products are sold throughout China. Some of our parts are exported to the United States, Canada, Russia, Brazil, and other countries, enjoying widespread popularity and praise from users.
Our factory currently has fixed assets of over 5 million RMB, working capital of over 4 million RMB, covering an area of over 20,000 square meters, with a building area of over 12,000 square meters. We currently produce DC starters and AC generators for construction machinery. Our main equipment includes 2 large hydraulic presses, 5 medium and small hydraulic presses, over 30 machine tools such as lathes, grinders, and milling machines, and over 50 sets of various specialized testing equipment. We have over 60 employees, including 3 engineers, 5 technicians, and 9 full-time technical personnel. Currently, the factory has an annual production capacity of over 150,000 starters, over 200,000 generators, over 150,000 armatures, and over 150,000 electromagnetic switches.
Our factory has a sound organizational structure. The factory has five management departments: quality inspection, technology, production, sales and marketing, and finance; and three workshops: generator assembly, starter assembly, and machining. Various organizational management regulations and training plans are being further improved to ensure high-efficiency and high-quality production.
Our factory passed ISO9000 international quality system certification in December 2000, was rated as an AAA-level credit enterprise in 2001, and passed IATF16949 certification in 2023. Currently, our factory supplies main engine manufacturers including Shanghai Diesel Engine Factory, Nantong Diesel Engine Factory, Guiyang Diesel Engine Factory, Wuxi Power Engineering Co., Ltd., and Tianjin Power Machinery Factory. Our factory will steadfastly implement the principles of "quality first, customer foremost, strict management, and brand creation," providing our customers with superior products through sincere service and excellent quality.
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