Common Problems with Insert Ball Bearings and How to Fix Them

Even the best insert ball bearings can run into trouble if not installed or maintained properly. Whether you're working with agricultural machines, conveyors, or industrial motors, bearing issues can cause unexpected downtime and repair costs. But don’t worry — most of these problems are easy to spot and fix once you know what to look for.

Let’s go through the most common insert ball bearing problems and practical solutions you can apply right away.

1. Bearing Noise or Vibration

If your machine suddenly starts making unusual noise, that’s a big red flag. Excessive vibration or humming often means the bearing isn’t sitting properly on the shaft or that the internal clearance isn’t right.

Possible Causes:

• Loose fit on the shaft

• Contaminated lubricant

• Bearing misalignment

How to Fix:

• Recheck the shaft tolerance and make sure the bearing fits snugly.

• Clean or replace the grease if it’s dirty.

• Always ensure the bearing housing and shaft are aligned during installation.

You might be surprised, but even a 0.1mm misalignment can cause premature wear.

2. Overheating During Operation

If you touch the housing and it’s way too hot, that’s not normal. Overheating can lead to lubricant breakdown and bearing failure.

Possible Causes:

• Excessive load or speed

• Poor lubrication

• Too-tight fit between the bearing and housing

How to Fix:

• Use a high-temperature grease suitable for your working conditions.

• Check for excessive tightening of the locking device.

• Reduce the load or operating speed if possible.

Sometimes it’s not even the bearing’s fault — overloading the machine can stress the entire system.

3. Contamination and Corrosion

Dust, water, or chemicals can easily sneak into bearings, especially in outdoor or humid environments. Once inside, they damage the rolling elements and races.

Possible Causes:

• Poor sealing structure

• Lack of protection in harsh conditions

How to Fix:

• Choose bearings with triple-lip seals or stainless steel housing if corrosion is a risk.

• Store spare bearings properly in a dry, clean place.

A quick note here — never wash bearings with water before installation. It may sound fine, but it kills the lubricant film instantly.

4. Shaft Wear or Loosening

Over time, constant operation may cause shaft wear, leading to a loose fit between the shaft and the inner ring of the bearing.

Possible Causes:

• Improper installation

• Over-tightened set screws

• Excessive vibration

How to Fix:

• Use adapter sleeve locking types for high-vibration conditions.

• Check the shaft surface roughness — it shouldn’t be too polished or too rough.

• Always follow the recommended tightening torque for set screws.

If the shaft is already worn out, it’s better to repair or replace it rather than forcing a new bearing on it.

5. Lubrication Issues

This one’s super common. Without enough lubrication, friction increases, causing wear and heat. But too much grease can also trap contaminants and cause failure.

Possible Causes:

• Irregular maintenance schedule

• Wrong grease type

• Over-greasing or under-greasing

How to Fix:

• Follow the manufacturer’s lubrication interval.

• Use the same type of grease consistently.

• Clean grease fittings before applying new lubricant.

Insert ball bearings are incredibly versatile — they’re used everywhere from conveyors to farming tools. But even the toughest bearing needs proper care. By understanding common issues and how to fix them, you can prevent downtime, save maintenance costs, and keep your machines running smoothly.