Preventing Bearing Failure

Pump bearing and bushing failures are often caused by a few common issues: poor lubrication, contamination, misalignment, excessive vibration, and improper installation. Addressing these factors can significantly extend equipment life and reduce downtime.

Common Causes of Failure

• Incorrect, contaminated, or insufficient lubrication
• Misalignment between pump and driver
• Contamination from leaking or worn shaft seals
• Excessive vibration, overload, or cavitation
• Improper installation, handling, or storage

Warning Signs

Watch for:

• Unusual noise (grinding, squealing, rumbling)
• Increasing bearing temperatures
• Excessive vibration
• Oil leaks or contaminated lubricant
• Visible shaft movement or coupling misalignment

Maintenance Best Practices

Maintain Proper Lubrication

• Use OEM-recommended lubricants.
• Follow correct lubrication intervals.
• Avoid over-greasing.
• Keep lubrication points clean.

Control Contamination

• Inspect seals regularly for leaks.
• Keep bearing housings, breathers, and vents in good condition.
• Prevent dirt, moisture, and process fluids from entering the system.

Ensure Correct Alignment

• Perform precision alignment after installation or maintenance.
• Check for soft foot conditions and worn couplings.
• Maintain rotor balance to minimize vibration.

Monitor Equipment Condition

• Track temperature and vibration trends.
• Listen for changes in operating noise.
• Regularly inspect lubricant condition.

Prevent Repeat Failures

When a bearing or bushing fails, don't simply replace the component. Investigate the root cause by checking alignment, lubrication, seals, operating conditions, and shaft condition. Correcting these issues prevents recurring failures and improves long-term reliability.

For critical equipment such as Nash liquid ring vacuum pumps, a proactive maintenance program is far more cost-effective than emergency repairs and unplanned downtime.