Fill the reservoir with air tool oil or 10W equivalent for 9 lb and 15 lb class. Use rock drill oil for the 38 lb and 60 lb class tools. Check all nuts and bolts to ensure they are tight on the tool. Make sure retainer locks into place. Replace retainer and springs if worn.
[pdf] With dozens of highly rated air compressors to choose from, it was a challenge to select the top performers for our hands-on tests. We considered brand names to an extent—after all, manufacturers such as Ca. While a reciprocating air compressor is quiet, a rotary screw air compressor is more silent. This air compressor has two separate helical screws working in unison to get the job done. Note that the two screws do not come in contact with each other, making them quieter.
[pdf] Compressor air screw VSDs usually have noise levels ranging from 60 dB to 85 dB, depending on the factors mentioned above. When selecting a compressor, it's important to consider the acceptable noise level for your specific application.
[pdf] 
