Cummins 3628997 Engine Lubricating Primer Motor Assembly

The Cummins 3628997 is a 24-volt DC electric motor assembly designed to drive the engine lubricating primer pump on heavy-duty K38, K50, QSK38, and QSK50 series diesel engines. This component pressurizes the lubrication system prior to cranking, reducing wear during cold starts and extending bearing life in severe duty cycles. Constructed with a high-torque permanent magnet or series-wound field design (TR100 platform compatible), the motor features sealed end-frames and corrosion-resistant hardware suitable for mining, construction, and marine environments. It mounts directly to the primer pump housing via SAE flange pattern. The unit is a direct interchange for Cummins OEM part numbers 3628997 and 3628757, and cross-references to primer assembly numbers 3630004, 3637969, and 3628965. Rated for continuous intermittent duty cycle per OEM pre-lube sequence logic.