Air compressors come in various types, each with specific functions. Among them, the diesel-driven mobile air compressor (mobile air compressor) is one of the most specialized. The failure of mobile air compressors is often caused by minor issues, which, if not addressed promptly, can lead to major breakdowns. Below is an overview of common minor faults in mobile air compressors and their corresponding solutions.
Table of Contents
1. Unable to Start
📌 Issue: The compressor does not start.
✅ Solution:
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First, check if the control voltage is present.
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If voltage is present, inspect whether the control electrical components and time relays are damaged. Replace them if necessary.
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If there is no voltage, the problem may be a blown fuse. Simply replace the fuse.
2. Compressor Does Not Supply Air
📌 Issue: The compressor runs but does not deliver air.
✅ Possible Causes:
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The control cylinder is not functioning.
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The butterfly valve has a mechanical failure.
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The loading solenoid valve (ISV) coil is not generating suction.
✅ Solution: Identify and repair the specific faulty component.
3. Exhaust Pressure is Too Low
📌 Issue: The air compressor is running, but the exhaust pressure is below the required level.
✅ Solution:
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Check for leaks in the system.
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Verify the pressure setting and adjust if necessary.
4. Exhaust Temperature is Too High
📌 Issue: The compressor overheats during operation.
✅ Possible Causes:
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Low or insufficient lubricating oil.
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Poor oil quality.
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Cooling fan failure.
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Blocked filters.
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Faulty temperature control valve.
✅ Solution: -
Replenish or replace the lubricating oil.
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Clean or replace clogged filters.
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Inspect and repair cooling fans.
5. Excessive Oil Consumption
📌 Issue: The compressor is using too much oil.
✅ Solution:
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Check if the oil content in the discharged condensate is too high.
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Verify if the lubricating oil level is too high.
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Inspect the oil separator and return oil pipe for blockages.
6. Automatic Shutdown During Operation
📌 Issue: The compressor shuts down unexpectedly.
✅ Possible Causes:
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Automatic shutdown settings are enabled.
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High equipment temperature.
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Cooling fan motor failure.
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Excessively high pressure.
✅ Solution: -
Check the display panel for error messages and diagnose accordingly.
7. Working Pressure Too High
📌 Issue: The inlet and outlet pressure reaches 15 bar, causing a power trip.
✅ Solution:
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Check if the load pressure setting is too high.
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Inspect the liquid level sensor.
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Contact maintenance to inspect the pressure regulating valve and unloading valve.
8. Motor Not Rotating Correctly
📌 Issue: The motor wiring is incorrect, or the star/delta switch is not functioning.
✅ Solution:
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Contact maintenance to verify the motor wiring (neutral and live lines).
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Check the switching signal controller inside the refrigeration compressor.
9. Solenoid Valve Failure
📌 Issue: The relay is loose or the wiring is disconnected.
✅ Solution:
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Secure any loose connections or replace damaged wiring.
10. Cooling System Failure
📌 Issue: The cooling fan does not rotate or malfunctions.
✅ Possible Causes:
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Fan blades are deformed.
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Fan relay is aging.
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Loose wiring.
✅ Solution: -
Contact maintenance to inspect the motor and wiring.
11. Damaged Belt
📌 Issue: The drive belt between the motor and compressor is damaged.
✅ Solution:
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Contact maintenance to replace the belt.
12. Low Oil Pressure
📌 Issue: The oil pressure is too low, affecting performance.
✅ Possible Causes:
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Insufficient oil in the compressor.
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Oil leakage in the pipeline.
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Blocked filter screen at the gasoline pump inlet.
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Malfunction in the steam pressure regulation valve.
✅ Solution: -
Refill the oil to the appropriate level.
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Check for and repair any leaks.
13. Electrical Circuit Faults
📌 Issue: Wiring problems in the electrical protection circuit or thermal control detection circuit.
✅ Solution:
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Contact maintenance to inspect and repair the electrical system.
14. Low System Pressure in the Main Pipeline
📌 Issue: The overall pressure of the compressed air system is too low.
✅ Possible Causes:
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Blocked air filter.
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Leaking intake pipe.
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Faulty intake solenoid valve.
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Leaks in the system or pipelines.
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Increased air demand from connected machines.
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Blocked dryer pipelines.
✅ Solution: -
Clean or replace the air filter.
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Inspect and seal any leaks.
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Ensure the solenoid valve is functioning properly.
15. Frequent Loading and Unloading
📌 Issue: The compressor frequently switches between load and unload states, causing inefficiency.
✅ Solution:
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Adjust the load and unload pressure settings for better stability.
Conclusion
Mobile air compressors are essential for on-site air supply in construction, mining, and other industries. Proper maintenance and quick troubleshooting of minor issues can prevent major failures, reduce downtime, and improve operational efficiency.
For further assistance with mobile air compressors, including quotations, selection advice, and brand recommendations, you can contact Dequan Electromechanical Air Compressor or other professional manufacturers. 🚀
