Chicago Pneumatic

Hello Cas. I've been reading a lot on your website about rotary screw compressors. I work in a little company that produces customizes feet stocks, so people who but it can walk better and feel no pain when using shoes. My boss asked me to repair our old Chicago Pneumatic air compressor, because overheats quickly. After reading a lot, I took the oil cooler out and its seems no to be working as it should. Besides that, is there any other possible causes to this issue? Best regards, Kleber Sanches Engenharia