If you are responsible for the reliability of HVAC air handling equipment, you probably have units that rumble and make more noise than they should.

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Most often this is due to the shaft to bearing fit up. Improper bearing installation can cause the bearing’s inner ring to wear a groove into the shaft.

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This is the arrangement as it was when we were called in. This is the belt drive side with the drive pulley removed. The bearing support structure was previously modified by another company. The original bearing was a four bolt flange style that bolted to the fan cabinet.

Hi-Tek Balancing provides full-service industrial balancing, vibration analysis, tooling, machining, and welding services to a wide range of companies and industries nationwide.

Here is the arrangement before repair. This is a very typical Sealmaster Low Height pillow block, belt drive. The Bearing rests on a shelf with a shim under to adjust ride height.

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Our innovative approach to equipment repair can save you thousands. We have numerous repair methods that allow for restoration of bearing fits without removing the shaft.

Once the shaft is grooved it’s only a matter of time before you realize that repeated bearing changes is not the solution. You also know that shaft replacement is difficult and very expensive.