Wheel Loader Komatsu WA380-6 WA430-6 WA450-6 WA470-6 WA480-6 Loader Fan Hydraulic Pump - 708-1S-00940 708-1S-00970 Common Faults Insufficient output flow of fan pump, low fan speed and engine overheating Low pressure of auxiliary pump, slow response of pilot control Abnormal noise during pump operation with housing vibration Oil leakage at pump mating surface and shaft end, damaged oil seals and gaskets Wear of internal gears and flow distribution components, pump overheating