5 Bearing Lubrication Myths That Are Destroying Your Equipment

Introduction

Bearing lubrication is one of the most common maintenance tasks at any industrial plant. But here's the paradox: the more often we do it, the more mistakes we make.

In 15 years of working with industrial plants, I've seen the same picture again and again: engineers who genuinely believe they're doing it right, while continuing to destroy equipment.

The problem is that many "truths" about bearing lubrication are actually myths. And these myths cost plants millions of dollars every year.

Let's break down the 5 most destructive ones.

Myth #1: "More grease means better protection"

This is the most common and most dangerous myth.

Intuitively, it seems logical: if a little grease is good, more must be even better. But with bearings, this belief is exactly the opposite of the truth.

Why over-lubrication is dangerous

When too much grease is added to a bearing assembly:

1. Pressure rises — excess grease builds hydraulic pressure that deforms the cage
2. Temperature climbs — the grease works under increased friction and degrades faster
3. Seals fail — excess pressure pushes seals inward, letting contaminants into the assembly
4. Wear accelerates — overheated grease loses its protective properties

The numbers

According to SDT Ultrasound Solutions statistics, 40 to 60% of bearings at industrial plants operate over-greased. And most of these cases go unnoticed until the bearing fails.

Myth #2: "Lubrication must strictly follow the schedule"

Schedules are good. But when a schedule becomes dogma, it becomes a problem.

The problem with average norms

A typical bearing lubrication schedule is built on:

• Equipment manufacturer recommendations
• Average operating conditions
• Typical service intervals

But the reality at a specific plant or mine rarely matches these "typical" conditions.

What the schedule doesn't account for

• Actual load — today the bearing runs at 80% capacity, tomorrow at 30%
• Ambient temperature — +40°C in summer, -20°C in winter
• Humidity — after rain or equipment washdown
• Grease condition — how much grease is actually left in the assembly

The result: the bearing gets lubricated on schedule, but not based on its actual condition. And that causes problems.

Myth #3: "A quiet bearing means everything is fine"

A quiet bearing doesn't mean a healthy bearing.

Why silence is deceptive

A bearing can run quietly while already failing due to:

• Over-lubrication — noise is dampened by the grease layer
• Under-lubrication — early-stage micro-spalling isn't audible
• The wrong type of grease — everything looks normal visually, but degradation is already underway

By the time a bearing starts making noise, the damage is already irreversible.

The solution

LUBExpert ultrasound diagnostics detects problems at an early stage, while the bearing is still running quietly but already needs attention.

Myth #4: "Any quality grease will do"

Quality grease is only half the battle. The other half is choosing correctly.

Why grease type matters

Different bearings require different types of grease:

Factor	Effect on grease selection
Rotation speed	High speed — low-viscosity grease
Load	High load — high-viscosity grease
Temperature	High temperature — thermally stable grease
Environment	Wet environment — water-resistant grease

Consequences of the wrong choice

Using unsuitable grease leads to:

• Reduced effectiveness — the grease doesn't perform its function
• Accelerated wear — insufficient protection
• Overheating — the grease doesn't operate in its optimal range
• Grease mixing — incompatibility between different types

Myth #5: "Lubrication is a simple procedure that needs no training"

Bearing lubrication isn't just "pump in some grease." It's a sophisticated technical procedure.

What a lubrication technician needs to know

A qualified technician must understand:

• Bearing type — ball, roller, tapered
• Operating conditions — speed, load, temperature
• Lubrication technique — how to correctly apply grease
• Result verification — how to determine the optimal fill level

The problem with unqualified maintenance

When lubrication is done by untrained personnel:

• The wrong amount of grease is applied
• An unsuitable grease type is used
• Lubrication technique is violated
• Results aren't verified

And all of this happens under the confident assumption that "lubrication is simple."

How to break these myths

LUBExpert from SDT Ultrasound Solutions is a tool that turns lubrication from a maintenance routine into an exact science.

What LUBExpert delivers

1. Objective data — you know exactly how much grease is needed
2. Real-time control — you see the result immediately
3. Documentation — a history for every bearing
4. Training — staff learn the correct technique

Results after implementation

Plants that have implemented LUBExpert report:

• 30–50% reduction in grease consumption
• 40–60% longer bearing service life
• 70–80% fewer downtime events
• Payback in 6–14 months

Conclusion

Bearing lubrication myths destroy equipment and cost plants millions. The good news is that these myths can be broken.

LUBExpert gives you objective data for decision-making and lets you turn lubrication from dogma into science.

Learn more

• More about LUBExpert — acoustic bearing lubrication system
• More about SDT340 — multi-sensor diagnostic platform
• All ultrasound instruments — full equipment range

Get in touch

If you'd like to discuss your plant's situation in more detail, contact us for a free lubrication risk assessment consultation.