---
title: "How to Fix Common Rolling Bearing Lubrication Failures & Extend Service Life"
date: 2026-05-19
description: "Lubrication failures cause 36% of rolling bearing breakdowns in industrial machinery, per ISO 281 standards. The most common issues are over-lubrication, under-..."
source: https://en.mshjzc.com/blog/56018.html
---

# How to Fix Common Rolling Bearing Lubrication Failures & Extend Service Life

Lubrication failures cause 36% of rolling bearing breakdowns in industrial machinery, per ISO 281 standards. The most common issues are over-lubrication, under-lubrication, and contaminated grease. Fixing these requires identifying root causes and applying manufacturer-recommended lubricants and volumes to avoid premature bearing replacement.

## Incorrect Lubricant Type

Using a grease with too high NLGI grade (e.g., NLGI 3) for low-speed bearings (<100 RPM) causes excessive friction. For example, a 6205 deep-groove ball bearing operating at 50 RPM requires NLGI 2 grease, as thicker consistency won’t distribute evenly across raceways. MS Bearings provides a lubricant compatibility chart for its standard bearing lines to simplify selection.

## Over-Lubrication Damage

Applying more than 30% of the bearing’s internal cavity volume leads to heat buildup, which breaks down grease and reduces its protective properties. A 6310 bearing has a cavity volume of ~12 cm³, so only 3.6–4.8 cm³ of grease is needed for re-lubrication. Excess grease can also push out seals, allowing dust or moisture to enter the bearing housing.

## Contaminated Grease Entry

Dust or water entering the bearing housing reduces lubricant lifespan by 70%, per SKF industrial bearing data. Using sealed bearings (e.g., 6205-2RS) in dusty or high-moisture environments prevents this contamination. MS Bearings offers IP67-sealed bearings for harsh outdoor applications like conveyor systems in mining or construction.

## Under-Lubrication Risks

Failing to re-lubricate every 2000 operating hours (for general industrial use) leads to metal-to-metal contact, causing pitting on raceways and eventual bearing failure. For high-temperature applications (>120°C), re-lubrication intervals drop to 500 hours to maintain a stable lubricant film. Skipping re-lubrication for a 6307 bearing at 1800 RPM can cut its service life by 60%.

How often should I re-lubricate a 6205 bearing in food processing equipment?

Every 1500 operating hours, per FDA-approved grease guidelines, to avoid cross-contamination and maintain smooth, compliant operation.

What NLGI grade is best for a 6307 bearing at 1500 RPM?

NLGI 2, as it balances pumpability and film strength for medium-speed industrial applications, ensuring consistent lubrication across the bearing’s rolling elements.

For project-specific requirements, consult your bearing supplier. Contact MS Bearings for free technical support on lubrication schedules and bearing selection.