D7E BFM1013 Coolant pump 20726092 21404502 21247955 02937441

The excavator engine drives the 21404502 water pump bearing and the impeller to rotate through the pulley, and the coolant in the 21404502 water pump is driven by the impeller to rotate together, and is thrown to the edge of the water pump shell under the action of centrifugal force, generating a certain pressure at the same time, and then flows out from the water outlet or water pipe. At the center of the impeller, the cooling liquid is thrown out and the pressure is reduced. The cooling liquid in the water tank is sucked into the impeller through the water pipe under the action of the pressure difference between the inlet of the pump and the center of the impeller to realize the reciprocating circulation of the cooling liquid.