✅ 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.

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.

Machines returned for faults often have tanks filled with water. Regular draining is crucial.

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

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.

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.

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.