Description
SRX-remanufactured Bosch alternator 120-129-0055 is a 12V, 55A negative-ground charging unit with internal regulation. Related reference families include Bosch 0120488286 and 0986034470, Caterpillar 100-8223, and Perkins 2871C105. The Caterpillar reman reference 0R-1905 corresponds to 100-8223; it does not identify the remanufacturer of this SRX unit. Match the original number, mounting points, connections and pulley arrangement to the engine serial configuration. Selected Caterpillar 3054/Perkins installations use this family, but engine model alone is insufficient to establish fitment. Cross-references 0120488286, 0986034470, 0R-1905, 0R1905, 100-8223, 1008223, 12164, 12164N, 220-385, 2781C10, 2871C105, 400-24113, 90-15-6301, AL5052X, IA0581 and MG241. Confirm fitment by original part number before ordering.


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