Some common mechanical preventive maintenance tasks for a cement rotary kiln include:
1. Inspection of Kiln Shell and Girth Gear
 - Kiln Shell: Inspect for cracks, deformation, and surface wear. Check for any signs of overheating or warping.
 - Girth Gear: Check for proper alignment, lubrication, and wear on teeth. Ensure no abnormal vibrations or noises.  2. Kiln Alignment
 - Ensure the kiln is properly aligned to prevent excessive wear on tires, rollers, and other parts. Misalignment can cause uneven wear and damage to the system.
 3. Tire and Roller Inspections
 - Tire Wear and Fit: Inspect kiln tires (riding rings) for proper clearance and wear. Ensure they are not rotating or creeping excessively relative to the kiln shell.
 - Roller Surfaces: Check for wear, flat spots, or damage. Inspect roller bearings for proper lubrication. 4. Lubrication
 - Regularly lubricate bearings, gear drives, and seals. Use the correct type of lubricant for each component.
 - Ensure proper oil and grease levels in the gearboxes and other moving parts.
 5. Thrust Roller and Stop Block Adjustment
 - Inspect the thrust rollers and ensure they are properly adjusted to prevent the kiln from shifting longitudinally.
 6. Seal Inspections
 - Check the condition of the seals at the kiln inlet and outlet. Look for signs of wear, cracks, or deterioration.
 - Ensure seals are operating efficiently to minimize air leakage, which can reduce fuel efficiency.