What are the common problems of flange slewing bearings and how to solve them?
Flange slewing bearings are robust components, but they can experience problems over time. Here are some common issues and their solutions.
Flange Slewing Bearing Common Problems and Solutions
1. Irregular Rotation or Jamming:
Problem: The bearing rotates unevenly or gets stuck, even without a load. This could be due to the ring becoming out of round during transport or storage.
Solution: This issue should ideally be caught during the fitting process. If it occurs after installation, the bearing might have been deformed. In such cases, the bearing may need to be replaced. Ensure proper handling and storage to prevent this.
2. Abnormal Noise During Operation:
Problem: Unusual sounds like squealing or grinding can indicate issues. Squealing often suggests insufficient lubrication, while grinding noises might mean internal wear or contamination.
Solution:
Squealing: Apply the correct type and amount of lubricant. Refer to the manufacturer’s recommendations for lubrication intervals and grease type (EP2 grease is often recommended).
Grinding: Stop operation immediately and inspect the bearing for wear, damage, or foreign material. Clean and relubricate or replace the bearing if necessary.
3. Lubricant Leakage:
Problem: Grease leaking from the seals.
Solution:
Over-lubrication: Ensure you are not lubricating too frequently. A typical cycle is 150-250 hours, but adjust based on the operating intensity.
Thinned grease: Check if hydraulic or gear oil from the slewing motor has contaminated the bearing grease, making it thin. Repair any leaks in the motor seals.
Incorrect grease: Using the wrong type of grease can cause it to thin, especially with temperature increases. Use the manufacturer-recommended grease.
Damaged seals: Carefully inspect the seals for damage or displacement and replace them if necessary.
4. Excessive Wear and Increased Clearance:
Problem: Over time, the rolling elements and raceways wear, leading to increased play or tilting.
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