8 Reasons for Lack of Oil in a Screw Air Compressor

A screw air compressor relies on sufficient oil levels to function efficiently. Oil serves multiple purposes, such as cooling, sealing, and lubrication. If the oil level is insufficient, it can lead to severe damage and reduced performance. Here are the common reasons for a lack of oil in a screw air compressor and how to address them.

1. Oil Leaks in the System

Oil leaks are a common reason for insufficient oil levels in screw air compressors. Leaks can occur due to damaged seals, loose connections, or cracked components.

Signs:

• Visible oil stains around the compressor.
• Reduced oil pressure.

Solution:

• Inspect and replace worn-out seals and gaskets.
• Tighten loose connections.
• Repair or replace cracked components.

2. Faulty Oil Separator

The oil separator separates oil from compressed air. A damaged or clogged oil separator can allow excessive oil to escape into the compressed air, reducing oil levels.

Signs:

• Increased oil consumption.
• Oil mist in the exhaust.

Solution:

• Replace the oil separator if damaged.
• Clean or maintain the separator regularly.

3. Improper Maintenance

Neglecting regular maintenance can lead to oil depletion. Old oil may degrade, reducing its effectiveness and volume over time.

Signs:

• Dark or degraded oil.
• Reduced compressor efficiency.

Solution:

• Follow the manufacturer’s recommended maintenance schedule.
• Replace oil at regular intervals.

4. Overheating Issues

High operating temperatures can cause oil to evaporate or degrade more quickly, resulting in lower oil levels.

Signs:

• High exhaust temperature warnings.
• Burnt smell from the compressor.

Solution:

• Ensure proper ventilation around the compressor.
• Check for clogged air filters or cooling system issues.

5. Incorrect Oil Type

Using the wrong type of oil can lead to rapid consumption or degradation. Not all oils are compatible with screw air compressors.

Signs:

• Frequent need to refill oil.
• Reduced lubrication efficiency.

Solution:

• Use oil specified by the compressor manufacturer.
• Avoid mixing different oil types.

6. Worn Bearings or Gears

Worn-out bearings or gears can consume more oil than usual due to increased friction and heat.

Signs:

• Unusual noises during operation.
• Frequent oil top-ups.

Solution:

• Inspect and replace worn components promptly.

7. Malfunctioning Oil Pump

The oil pump ensures oil circulation within the compressor. If it fails, oil may not reach critical components, causing insufficient lubrication.

Signs:

• Low oil pressure readings.
• Components overheating.

Solution:

• Inspect and replace the oil pump if necessary.

8. Excessive Blow-by

Blow-by occurs when compressed air escapes past the piston rings into the crankcase, carrying oil with it.

Signs:

• Excessive oil in the crankcase.
• Increased oil consumption.

Solution:

• Check and replace damaged piston rings or cylinder liners.

Conclusion

A lack of oil in a screw air compressor can lead to serious performance issues and potential damage. Regular maintenance, timely inspections, and the use of appropriate oil are crucial to preventing this problem. If you encounter persistent oil-related issues, consult a professional technician to avoid long-term damage to your compressor.

Advantages of a 7.5kW Variable Speed Screw Air Compressor

Analysis of the reasons for oil shortage in screw air compressor: