Hydraulic Pump Assembly for Komatsu Dozer Cooling Fans Part Numbers: 708-1W-00670, 708-1W-00600, 708-1W-00680 Application: Komatsu Dozer D375A-6, 475A-5 Working Principle The fan pump is a hydraulically driven component 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 optimal cooling performance for