At Harris Equipment we understand that replacing an air compressor in it's entirety isn't always an option.  Most companies will suggest that you replace the whole unit when the airend starts to make a noise.  The associated costs of replacing the whole air compressor can add up quick.  From upgrading the electrical service to modifying the piping to receive the new unit, these are all added costs.  Not to mention the labor to remove the old unit and  install the new unit.  Just because you start to hear a "growl" or suspect that a bearing is going out in the airend, doesn't mean that it's time to replace the whole air compressor. Consider rebuilding the airend.  At Harris Equipment, we can rebuild the airend and send it back to you with an assurance that you will be up and running with minimal costs.