Maintenance Tip｜How Often Should You Replace Grease?

In industrial maintenance, the grease replacement interval is a key factor in ensuring equipment longevity and performance. Overlubrication wastes resources; insufficient replacement risks failure. So, how often is "just right"?

✅ 1. Five Key Factors That Affect Grease Life

1. Operating Temperature
   Grease oxidizes faster at high temperatures. At 180°C, some greases last less than 500 hours.

2. Speed and Load
   High-speed or high-load components (e.g. spindles, fans) shear grease faster, reducing its lifespan.

3. Contamination
   Dust, moisture, and chemicals accelerate grease degradation, requiring more frequent replacement.

4. Grease Type
   Polyurea and PFPE greases typically last longer than mineral-based ones.

5. Lubrication Method
   Automated or centralized systems often extend the interval compared to manual greasing.

✅ 2. Recommended Replacement Intervals by Application

✅ 3. Signs Your Grease Needs Changing

• Discoloration or darkening

• Strong or burnt odor

• Thin, watery texture or hardened residue

• Noise or friction increase during operation

• Lab analysis shows drop in performance

✅ 4. Best Practices

• Keep a lubrication logbook (date, quantity, product)

• Use scheduled maintenance + condition-based monitoring

• Choose premium greases with long service life (e.g. Kluber, Molykote, Krytox)