The SM 7820 Alternator Rotor Assembly is an industrial-grade electrical component specifically engineered for the Bosch-style (B. Type) charging systems used in Eicher Canter and other light-to-medium commercial vehicles (LCVs). This is a "Pump Type" rotor, featuring a precision-machined, splined rear shaft designed to drive the mechanical vacuum pump (brake booster pump) mounted on the back of the alternator. Built to O.E. (Original Equipment) Specifications, this rotor is designed to handle the high-torque cranking and continuous charging demands of the E483 and similar diesel engine platforms.