Condition-Based Bearing Lubrication: How to Avoid Under- and Over-Greasing

What's wrong with traditional lubrication

At most plants, bearings are greased on a calendar — weekly, monthly, per the maintenance schedule. That approach is convenient, but it ignores the actual condition of the component.

The result is two recurring errors:

• under-greasing, where friction in the contact zone rises and wear accelerates;
• over-greasing, where excess grease raises temperature, loads the seals, and also shortens service life.

Why ultrasound catches problems before vibration and temperature do

The first signs of a developing bearing problem show up as high-frequency friction noise. Ultrasonic diagnostics picks up this signal before the defect becomes visible through temperature or classic vibration analysis.

That's exactly the stage where it's easiest and cheapest to intervene: add the right amount of grease and stop in time.

How Precision Acoustic Lubrication works

The Precision Acoustic Lubrication approach is built on a controlled procedure:

1. Measure the baseline ultrasound level in the bearing.
2. Add grease in small increments.
3. Watch how the acoustic friction level changes.
4. Stop feeding grease once the signal shows the optimal condition.

This turns lubrication from a subjective operation into a repeatable, feedback-driven process.

Practical impact for a plant

When implemented correctly, a plant gets:

• fewer unplanned shutdowns caused by bearings;
• lower lubricant consumption;
• longer bearing service life;
• more predictable maintenance planning.

Where it delivers the biggest payoff

The biggest returns are usually seen at sites with large populations of rotating equipment:

• pumps;
• fans;
• gearboxes;
• electric motors;
• conveyors.

The higher the cost of downtime, the faster a move to condition-based lubrication pays for itself.

Related solutions

• LUBExpert
• SDT340
• SDT270

Conclusion

Precision Acoustic Lubrication removes the "blind spot" in a lubrication program. Instead of "grease on schedule," the maintenance team gets a clear, measurable rule: "grease based on actual condition."

For plants, that means a higher level of reliability and fewer losses from unplanned repairs.