The SM 2052 is an ultra-heavy-duty 24-Volt Alternator Rotor (Armature Assembly) specifically engineered for the high-output alternators used in Caterpillar (CAT) 320 Series Excavators (including 320C, 320D, and 320D2). Designed for the 2-Pin electronic regulator system, this rotor is built to handle the extreme environments and continuous duty cycles of global construction, mining, and forestry operations.