Answer: If the oil level of a screw air compressor is lower than the lower limit of the oil mark during operation, refueling should be done. When refueling, first stop the machine, exit the air compressor from the joint control state, wait for the automatic pressure relief after shutdown, and the pressure gauge will display zero, then disconnect the main power switch of the air compressor unit, hang up the maintenance warning sign, observe the oil level and refuel.
The lubricating oil will remain in the oil pipeline and the main engine, so the oil level must be accurately judged before refueling to prevent the refueling level from being too high and being carried away by the air, increasing the oil content in the air. The highest oil level should be when the oil level is at the upper position of the oil mark; the lowest oil level should be checked when the machine is running, and the oil level is at the lower limit of the oil mark.
