Replacement suggestion:

1 - Large areas of scratches and severe wear appear on the surface of the auger. 

2 - Frequent fertilization leads to clogging and uneven fertilizer distribution 

3 - The original bushing has worn down and become thinner, causing a distinct abnormal noise when the auger rotates. 

4 - Excessive clearance between components, resulting in leakage of fertilizers from the discharge port. 

5 - Long-term high-frequency operation leads to aging and failure of the auger assembly.