Rated Excellent
Expert Advice and Aftersales
Free UK Delivery*
Air Compressor Maintenance Guide
Maintaining your Air Compressor is essential for ensuring its long life and consistent performance. This Hyundai Power Products guide will walk you through key maintenance tips and procedures, providing you with the knowledge to keep your air compressor in top condition. We be will looking at the Hyundai HY27550 Oil-Free Low Noise Air Compressor as an example.
Safety First
Before performing any maintenance:
✅ Ensure the air compressor is unplugged from the mains.
✅ Confirm that the machine is switched off.
✅ Drain all air from the system by connecting an air gun and opening the drain valve. This step reduces the risk of accidents.
Above: How to drain the air from the compressor.
Regular Tank Draining
Condensation inside the tank can lead to water buildup over time.
Follow these steps to prevent issues:
✅ Open the water drain valve at the bottom of the tank to let all water out. This should be done daily—either before starting work in the morning or after finishing in the evening.
✅ Leaving water in the tank can lead to rust, reduced efficiency, and even damage the compressor.
Above: How to open the water drain.
💡Maintenance Tip:
Machines returned for faults often have tanks filled with water. Regular draining is crucial.
3. Inspecting and Cleaning the Non-Return Valve
The non-return valve prevents air from escaping back through the compressor. Problems can arise if dirt, grime, or rust accumulates.
Symptoms of a faulty valve include:
- A constant hissing sound when the machine is off.
- Frequent cycling of the pump.
Above: Locating the non-return valve on the air compressor
How to clean your Air Compressor Pump Valve?
Locate the non-return valve between the motors.
Use a 19mm socket and extension bar to remove the valve cap.
Carefully remove the silicone seal, spring, and plunger.
Clean all components using a spray cleaner like WD-40 or brake cleaner.
Inspect for wear or damage. Replace parts if necessary (available from Hyundai's parts department).
Reassemble the valve, ensuring the O-ring is correctly seated.
Above: Where to locate the non-return valve on an air compressor
Above: cleaning the pump valve components and ensure the O-ring valve is currectly seated.
4. Air Filter Maintenance
Clean air filters are critical for preventing dirt and debris from entering the compressor, which could lead to overheating and reduced efficiency.
Above: Clean and Inspect the air filter regularly.
💡 Maintenance Tips:
Inspect filters regularly, especially in dusty environments.
Blow out dirt using compressed air or replace the filters as needed. Replacement filters are available through Hyundai's parts department.
Blocked filters can strain the motor, shortening the machine’s lifespan.
5. Valve Plate and Piston Maintenance
Over time, the valve plates, cylinder liners, and piston seals may require attention.
Steps:
Remove the air outlet pipe and air filter.
Loosen and remove the Allen bolts on the pump head.
Inspect the valve plates for cracks or dirt. Clean or replace them as needed.
Check the piston rings and cylinder liners for wear. Clean and replace if necessary.
Ensure all components are reassembled correctly. Misalignment can lead to efficiency loss.
Above: How to remove the air outlet pipe.
Above: Remove the six allen bolts to remove the plates
Note: Always ensure the curve of the reed valves faces downward during reassembly.
6. Additional Maintenance Tips
✅ Daily Use: Drain the tank after every use to prevent water accumulation.
✅ Routine Inspections: Regularly check for unusual noises, leaks, or reduced performance.
✅ Part Replacements: All critical components, such as seals, filters, and valves, are available through Hyundai’s parts department. Prompt replacement can extend the life of your machine.
With proper care and regular maintenance, your Hyundai 27550 Oil-Free Super Silent Compressor can provide reliable service for years. This isn’t a disposable item—investing time in maintenance ensures its longevity and efficiency.
For more detailed guidance or replacement parts, contact Hyundai Power Products or visit our website.
Stay safe and keep your compressor running smoothly!
