It is important to keep regular checks on your air compressor. Any changes in noise can signify a potential expensive bearing failure.
This was the case with one of our local Prisons.
Our contact on site notified us of the Air Compressor running noisier. We attended site straight away and on clearing security along with our escort the engineer soon discovered the fault was down to the Motor & Airend Bearings starting to fail.
We arranged to remove the machine, install a temporary hire Compressor and carry out the relevant work to the Atlas Copco Air Compressor.
Removing the need for the replacement of either the Motor or Airend or possibly the entire Air Compressor, if the unit had failed.