349D2 ECM Replacement: 366-8821-00 20R-2323 Engine Computer Board for CAT D-Series Excavator Controller

On a 49-ton machine like the 349D2, the control module is the difference between a working shift and a parked excavator. This ECM is supplied against 366-8821 and its 366-8821-00 revision, the number the D-series parts counter reads for the 349D2 deck, with 20R-2323 covering owners who prefer a remanufactured exchange. The wider D-series fleet - 312D through 390D - shares controller lineage, so the module number and the machine serial must be matched together rather than quoted from the model name alone. New units ship anti-static packed and inspected, and where the application requires programming we confirm the software route before the order is confirmed.