English
This compact 24V 25A alternator is purpose-built for older Komatsu equipment relying on external mechanical voltage regulators — a common configuration in machines from the 1980s through early 2000s. It fits a broad range of dozers, excavators, wheel loaders, and forklifts, including D20/D31, PC100/PC400, WA40/WA50, and PW100/PW200 series.
It directly replaces:
WAI 12251N,
Lester 12251 / 12251A / 12251B,
Komatsu 600-821-6110 to 600-821-6160, and
Nikko 0-33000-5840, 0-33000-6511 series.
Manufactured by SANYOU, the unit features a lightweight aluminum housing and simplified internal architecture optimized for reliability in low-complexity electrical systems. Its single-groove, 95mm pulley aligns precisely with original drive setups—ensuring correct belt wrap and tension without shaft modification. Ideal for restorers, small contractors, and rental yards maintaining proven mechanical-era machines.
Mounting Dimensions
Specifications
OEM NO.
Applications
| Specifications | MFR | NIKKO |
| Voltage | 24 | |
| Amp. | 25 | |
| Grooves | 1 | |
| Pulley | 95 |
| Producer | Number |
| WAI | 12251N |
| LESTER | 12251, 12251A, 12251B |
| KOMATSU | 600-821-6110, 600-821-6120, 600-821-6130, 600-821-6140, 600-821-6150, 600-821-6160 |
| NIKKO | 0-33000-5840, 0-33000-5850, 0-33000-5860, 0-33000-5870, 0-33000-5880, 0-33000-6510, 0-33000-6511, 01-33-2000 |
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, OEM Nikko 24V 25A 1V95 Alternator for Komatsu D20-D53, PC100-PC410 & MQ DCA-125SSJU – Compatible with 12251N, 0-33000-5840, 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. Wholesale Nikko 24V 25A 1V95 Alternator for Komatsu D20-D53, PC100-PC410 & MQ DCA-125SSJU – Compatible with 12251N, 0-33000-5840. 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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