The John Deere AL151142 Control Unit, also known as a Basic Control Unit (BCU) or CALCULATEUR, is a genuine OEM replacement part designed for a wide range of John Deere agricultural and industrial machinery. This essential electronic component ensures proper system operation and management. It is superseded by part number AL162476 and also replaces AL160655. With precise dimensions of 254 mm length, 254 mm width, and 127 mm height, and a weight of 1.36 kg, this control unit is engineered for direct fitment and reliable performance across numerous John Deere tractor, combine, and cotton picker models, including various 6000D, 7000, 8000, 9000, and 9R/RT/RX series.