Fan Pump Assembly for Komatsu Dozer D475A-5 / D475A-5A / D375A-6 Part Numbers: 708-1W-00600, 708-1W-00631, 708-1W-01632 Compatible with Komatsu D375A, D475A-5, D475A-5A Working Principle of Bulldozer Fan Pump The fan pump is a hydraulically driven pump that converts mechanical energy from the engine into hydraulic energy. This pressurized oil drives the fan motor to rotate the cooling fan. The system automatically adjusts pump output flow to regulate fan speed, maintaining