Caterpillar 1873523 Transmission Oil Cooler Core Assembly

The 1873523 core assembly functions as a transmission oil cooler, regulating fluid temperature by transferring heat from the transmission oil to the engine coolant circuit. It is engineered for heavy-duty powertrain applications in construction machinery operating under high thermal loads. Constructed with aluminum plate-and-bar or tube-fin core architecture, the unit provides high heat rejection capacity in a compact envelope. The core dimensions measure approximately 419 mm in length, 234 mm in width, and 234 mm in height. The assembly weighs 23.6 kg (52 lbs). It serves as a direct replacement for Caterpillar OEM part numbers 187-3523 and CA1873523, and cross-references to remanufactured part number 10R-3644.