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The following are some of the key maintenance activities that should be performed on coal mills :

1. Regular inspection: Coal mills should be inspected regularly for signs of wear and tear, such as cracks, leaks, or other damage. Inspection should include checking the grinding elements, wear plates, seals, and bearings.

2. Lubrication: Proper lubrication is critical to the performance and longevity of coal mills. Lubrication should be done on a regular basis, following the manufacturer's recommended schedule.

3. Cleaning: Coal mills should be cleaned regularly to prevent the accumulation of coal dust, which can increase the risk of fires and explosions. Cleaning should include the grinding elements, air ducts, and other components.

4. Replacing worn parts: Grinding elements, wear plates, seals, and bearings should be replaced when they become worn or damaged. This can help to prevent downtime and extend the life of the coal mill.

5. Alignment: Proper alignment of the coal mill and associated equipment is critical to ensure smooth operation. Misalignment can cause vibration, wear, and damage to the equipment.