Before starting the mud pump, please check whether the inlet and outlet pipes are blocked, whether the front and rear bearings are filled with butter, and whether the pan root is full. When mud pump works, it should be equipped with high-pressure clean water pump, which transfers fresh water greater than the pressure of mud pump to leak-proof filler to protect the filler. When mud pump works, it must not close the flushing pump, otherwise, the sealing part will wear quickly. Whether the clearance between impeller and guard plate is reasonable or not has a great influence on the life of mud pump. If the clearance is unreasonable, the vibration and noise will occur during the operation of the pump, and the overflow parts will be damaged quickly. Therefore, when replacing the impeller, attention should be paid to making the clearance meet the requirements of the drawings. The clearance adjustment can be carried out by adjusting the screw on the back bearing body. The permissible suction range of mud pump is measured when transporting clear water. The influence of mud on suction capacity should be considered when sucking mud.