9.Motor https://www.ever-power.net/?s=laser+cutting+air+compressor&post_type=product maintenance.
According to the motor instruction manual for maintenance.
8. drive belt.
To adjust the degree of tightness every 2000 hours, every 4000 hours to check the deterioration, according to deterioration decide whether to replace.
7, safety valve.
Every 4000 hours to check on whether the action is sensitive.
6.Pressure valve.
Clean every 4000 hours, and check whether the opening pressure is regular.
because for oil-atmosphere compressors, the oil-water separator function: separates the essential oil from the moisture in the air and therefore accumulates over a long period of period and can affect the filtration effectiveness without the need to replace or clean the oil-water separator
5, coal and oil separator.
Every 4000 hours need to replaced a fresh piece.
Otherwise the oil can make a impact of the cutting effect
4.oil filter.
Every 2000 hours to replace a new piece.
Every 1000 hours need check oil content nonetheless it 
want to replace the brand new oil after 4000 hours