How to maintain the slewing bearing

Maintaining slewing bearings is crucial to ensure their longevity and optimal performance, especially given their application in heavy-duty and critical systems. Here’s a guide on how to maintain slewing bearings.

Slewing bearing maintenance

1. Regular Inspection

Visual Inspection: Regularly check the bearing for any signs of wear, cracks, or damage. Look for leaks, corrosion, or contamination on the bearing surfaces.

Check for Unusual Noises: Listen for any unusual sounds during operation, which may indicate wear or damage.

Monitor Operating Conditions: Regularly monitor the operating temperature and load conditions to ensure they are within the specified limits.

2. Lubrication

Regular Greasing: Slewing bearings require proper lubrication to minimize friction and wear. Grease the bearings at intervals recommended by the manufacturer, typically every 100 to 500 operating hours depending on the application.

Use the Correct Grease: Use the type of grease specified by the manufacturer. Different applications may require specific types of grease, such as those with specific viscosity or additives.

Grease Distribution: When applying grease, rotate the bearing slowly to ensure even distribution of the lubricant. Pay special attention to the raceway and gear teeth.

Check Grease Condition: Periodically check the condition of the grease. If it appears contaminated or degraded, clean out the old grease and replace it with fresh lubricant.

3. Tightening Bolts

Regular Bolt Inspection: Check the mounting bolts regularly for any signs of loosening or wear. Loose bolts can lead to misalignment and excessive wear on the bearing.

Proper Torque: Ensure that all bolts are tightened to the manufacturer’s specified torque. Use a calibrated torque wrench for accuracy.

Re-Tightening Schedule: After the initial installation, re-tighten the bolts after the first 100 hours of operation and then according to a regular schedule.

4. Sealing and Protection

Inspect Seals: Regularly inspect the seals for any damage or wear. Damaged seals can allow contaminants like dirt, dust, and water to enter the bearing, leading to premature wear.

Replace Worn Seals: Replace any seals that show signs of wear or damage to maintain the bearing’s integrity.

Protective Covers: Use protective covers to shield the bearing from external contaminants, especially in harsh environments.

5. Load Monitoring

Avoid Overloading: Ensure that the load on the slewing bearing does not exceed the manufacturer’s specified limits. Overloading can cause excessive wear and shorten the bearing’s lifespan.

Even Load Distribution: Ensure that the load is evenly distributed across the bearing. Uneven loads can cause localized wear and lead to premature failure.

6. Rotational Play and Backlash Check

Check for Play: Periodically check the bearing for any increase in rotational play or backlash, which can indicate wear or loosening of the bearing components.

Adjust if Necessary: If excessive play is detected, adjustments may be necessary, or it may indicate that the bearing is approaching the end of its service life.

7. Temperature Monitoring

Monitor Bearing Temperature: Keep an eye on the operating temperature of the bearing. A significant increase in temperature may indicate issues such as insufficient lubrication, overloading, or excessive friction.

Take Action if Overheating: If overheating is detected, stop the operation and inspect the bearing to identify and address the cause.

8. Gear and Raceway Condition

Inspect Gear Teeth: Regularly inspect the gear teeth for signs of wear or damage. Damaged teeth can lead to improper meshing and increased wear.

Check Raceway: Inspect the raceway for any signs of wear or pitting. Significant wear may require the bearing to be replaced.

9. Documentation and Record-Keeping

Maintain Logs: Keep detailed records of all inspections, maintenance activities, and any issues identified. This helps in tracking the bearing’s condition over time and planning for maintenance.

Follow Manufacturer’s Guidelines: Always adhere to the maintenance guidelines provided by the bearing manufacturer, including inspection intervals, lubrication schedules, and replacement recommendations.

10. Professional Maintenance

Periodic Professional Inspection: In addition to regular in-house maintenance, consider having a professional service provider conduct a thorough inspection of the slewing bearing at scheduled intervals.

By following these maintenance practices, you can significantly extend the life of slewing bearings, reduce downtime, and avoid costly repairs or replacements.