The parts of the screw air compressor that need to be cooled by water include the cylinder, intercooler, air compressor aftercooler and lubricating oil cooler.
Analysis of insufficient lubrication of air compressor due to lack of oil: Air compressor manufacturers require the use of specified brands of lubricating oil
If the air compressor external power supply is 220V, 5Hz, be sure to use a dedicated socket with a rated current greater than the rated current of the motor