D5E excavator BF4M1013 Coolant pump 20450746 21727935 21727941 04206746

The D5E excavator engine drives the 20450746 water pump bearing and the impeller to rotate through the pulley, and the coolant in the 20450746 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.