How To: Maintaining Split Case Pillow Block Bearings

Make the most out of investing in quality equipment.

Maintaining split case pillow block bearings is important for ensuring smooth operation and maximizing their lifespan. If done correctly and on consistently these bearing should be unstoppable. I have many pieces of equipment that have had the same bearings for 35+ years running 24/7.

1. Safety First

  • Power Off: Always ensure the machinery is powered off before performing any maintenance.

  • Lockout/Tagout: Follow lockout/tagout procedures to prevent accidental startup.

  • Wear Protective Gear: Safety glasses, gloves, and steel-toed shoes should be worn.

2. Regular Visual Inspections

Perform regular visual checks to ensure the pillow block bearing is in good condition.

  • Check for Leaks: Look for signs of oil or grease leaks around the bearing housing.

  • Inspect for Wear: Examine the bearing for signs of wear, cracks, or damage on the housing and shaft.

  • Check Alignment: Ensure that the shaft and bearing are aligned properly. Misalignment can lead to premature bearing failure.

  • Cleanliness: Make sure the bearing and surrounding areas are free from dirt and contaminants that could affect performance.

3. Lubrication

Bearings need proper lubrication to reduce friction and wear. Follow these steps:

  • Determine Lubrication Type: Check the manufacturer’s specifications for the type of grease or oil to use.

  • Lubricant Quantity: Ensure the proper amount of lubricant is used. Too much or too little can cause issues.

  • Lubrication Schedule: Follow a regular schedule for re-lubricating the bearing based on operating conditions. Typically, bearings should be re-greased every 3 to 6 months, but it can vary depending on usage.

  • Use a Grease Gun: For grease-lubricated pillow block bearings, use a grease gun to inject grease into the lubrication fitting.

  • Monitor Lubricant Condition: If the lubricant becomes dirty or contaminated, replace it with fresh lubricant.

4. Check for Vibration or Noise

  • Listen for Unusual Noises: Squealing, grinding, or other unusual noises may indicate wear or lack of lubrication.

  • Vibration Monitoring: Use a vibration meter to detect any irregularities in the bearing’s performance. Increased vibration can signal internal damage.

5. Cleaning and Maintenance of the Housing

  • Clean the Bearing: Periodically clean the bearing and housing to remove any accumulated dirt or debris. Use a clean cloth or brush for this purpose.

  • Inspect the Seal: Check the seals for damage. If seals are worn or damaged, replace them to prevent contaminants from entering the bearing.

6. Replace Damaged Bearings

  • When to Replace: If the bearing is damaged or worn beyond repair, it must be replaced immediately to prevent further damage to other components.

  • Proper Removal: Use the appropriate tools to remove the bearing from the housing without causing damage to the shaft or housing.

  • Install New Bearing: When installing a new bearing, make sure it is properly aligned and securely fastened in the housing.

7. Monitor Operating Conditions

  • Temperature: Monitor the bearing’s temperature. Excessive heat can be a sign of excessive friction or insufficient lubrication. Operation temperature should be from 50-75 deg C. The “older” guys around the shop always told me if i couldn’t hold my hand on it for more than 10 seconds it was too hot. Of course that doesn’t give you much of an exact indicator. I will say cleaning out and repacking an over heated bearing, I have seen the temperature drop 20-30 DegF.

  • Speed and Load: Ensure that the bearing is operating within the recommended speed and load limits.

8. Record and Keep Logs

  • Maintenance Records: Keep a log of all maintenance activities, including inspections, lubrication, repairs, and bearing replacements. This helps to identify patterns and plan for future maintenance needs.

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