BEARING FAILURE, MAINTENANCE, AND TROUBLESHOOTING

Prevent Bearing Failure in Liquid Ring Vacuum Pumps and Compressors

Did you know most bearing failures are not caused by manufacturer's defect? From not enough grease to too much grease, or improper repairs by an unauthorized shop - our service technicians have seen it all. 

Regardless of the cause, bearing failure puts your operation at risk for unscheduled downtime and repairs. 

Bearing failure can be prevented with proper maintenance and monitoring. Included below are some of the most common causes and solutions for preventing bearing failure in your liquid ring pump or compressor.

 

CAUSE OF FAILURE: LUBRICATION

POSSIBLE CAUSES

 Incorrect seal liquid rates conditions 

Incorrect grease              

Excess grease         

Insufficient grease   

Contamination of grease      

Mixing grease types

SOLUTIONS

Use only the grease recommended by Nash for your specific model and operating conditions.

Monitor packing leakage.

Do not over-grease bearings

Check grease every 6 months, refill as needed.

DO NOT MIX GREASE - refill grease should be the same as the existing grease.

Refer to your manual for additional information, or feel free to contact us.

CAUSE OF FAILURE: PLUGGED DRIP TRAY

POSSIBLE CAUSES                                        

Water/seal liquid dripping from the stuffing box can backup and enter the bearing housing, contaminating the lubricant.

SOLUTIONS

Keep the drip tray opening (drain) clean and clear of debris to allow water to exit freely.

 

CAUSE OF FAILURE: IMPROPER INSTALLATION

POSSIBLE CAUSES      

 Shaft alignment

"Soft" pump foot

Piping stress

SOLUTIONS

Check coupling alignment - to spec

Check for soft foot - pump properly shimmed

Check for equal seal flow to each side of pump

Eliminate piping stress, when inlet is disconnected no misalignment

Monitor bearing temperatures and vibration weekly

 

CAUSE OF FAILURE: IMPROPER REPAIR

POSSIBLE CAUSES    

Shafts machined in place

Bearing re-used after repair

Proper bearing installation not followed

SOLUTIONS

Contact us for evaluation.

 

If you are experiencing bearing failure mode, we are available to help. We can walk you through the potential solutions above, and based on our extensive experience can troubleshoot unique situations.

Through preventative maintenance, and ongoing support we can help you prevent bearing failure and other typical pump issues before they become larger problems.

You invested in a NASH® pump for a reason - reliability. Let us help you keep your operation running smoothly, reliably and efficiently.

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