Excavator Komatsu PC2000-8 Fan Pump Auxiliary Pump Assembly Part Numbers: 708-2L-00280, 708-2L-00281, 708-2L-01280, 708-2L-06970 The Komatsu PC2000-8 excavator fan pump is a hydraulic fan piston pump specifically designed for this model of large excavator. Compatible with part numbers 708-2L-00280, 708-2L-01280, and 708-2L-06970. Common Faults Insufficient output flow of fan pump, low fan speed and engine overheating Low pressure of auxiliary pump, slow response of pilot