To change the oil in a screw air compressor, it's essential to understand when and how to do it properly. Oil changes are not just routine maintenance—they require careful attention because improper handling can lead to serious safety issues. Before starting, you need to determine the right time for an oil change based on the manufacturer’s recommendations or the condition of the oil itself. Additionally, the amount of oil added must be precise to avoid overfilling or underfilling, both of which can harm the system.
First, always perform the oil change when the compressor is still warm but turned off. This ensures that the old oil flows out more easily. After the unit has cooled slightly, release the pressure from the oil-gas separator and drain the used oil completely. Once the old oil is removed, refill the system with new oil until the level reaches above “70†on the sight glass. Some models have a red line marking the maximum fill level—this should be respected to prevent overfilling.
Second, pay close attention to the correct oil volume. Each screw compressor has a specific oil capacity. Adding too much oil can cause excessive oil carryover in the compressed air, leading to inefficiency and potential damage. On the other hand, insufficient oil can result in poor lubrication, overheating, and increased wear on internal components. Always check the oil level before and after the change to ensure it's within the recommended range.
Third, never attempt to change the oil while the compressor is running. Make sure the machine is fully powered down, the intake valve is closed, and all pressure has been released. If you try to change oil under pressure, it can cause oil to spray out unexpectedly, posing a risk of injury or damage to the equipment.
Fourth, it's highly recommended to use original or high-quality compatible oil. Using substandard or incorrect oil can accelerate wear and reduce the lifespan of your compressor. Regularly inspect the oil’s condition—look for signs of contamination, discoloration, or thickening. If the oil appears degraded, replace it immediately. Never mix old or deteriorated oil with new oil, as this can compromise performance and potentially damage the system.
By following these steps carefully, you can ensure safe and effective oil changes that help maintain the efficiency and longevity of your screw air compressor.
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