The friction on one side of the leaf wheels is severe, and the seal on the impeller is like this, causing the quality of the impeller to be unbalanced and causing the shaft to be cut.

     1. The lubrication of this pump bearing may not be changed for a long time, causing bearing wear, which is the owner's responsibility.

     2. The straightness of the axis is not guaranteed. When the pump shaft is rotated, the shaft swing and vibration will reduce the intensity of the shaft. The friction of the impeller causes the torque of the shaft. The possibility of a break is the responsibility of the manufacturer.