VEVOR KYJ-6554 (50L 750W 116 Psi)
VEVOR 50L Oil-Free Ultra-Quiet Horizontal Air Compressor User Manual
Brand: VEVOR
Model: KYJ-6554 (50L 750W 116 Psi)
1. Introduction
Thank you for choosing the VEVOR 50L Oil-Free Ultra-Quiet Horizontal Air Compressor. This air compressor is designed for a wide range of pneumatic tool applications, including drills, nail guns, caulking guns, pneumatic wrenches, and more. It is ideal for home repair, tire inflation, vehicle maintenance, and various renovation tasks.
Equipped with an oil-free pump for minimal maintenance and a robust 50-liter tank, this compressor ensures continuous and high-efficiency operation. Its 1 HP/750 W pure copper motor provides powerful, energy-saving performance with ultra-low noise levels, ensuring long-lasting and quiet service.

Figure 1: VEVOR 50L Oil-Free Air Compressor. This image shows the complete air compressor unit, highlighting its compact design with wheels and handle for portability.
2. Important Safety Instructions
Always follow basic safety precautions when using electrical appliances to reduce the risk of fire, electric shock, and personal injury. Read all instructions before operating this product.
- Electrical Safety: Ensure the power supply matches the voltage specified on the compressor's nameplate (230V 50Hz). Do not operate the compressor with a damaged cord or plug.
- Pressure Safety: Never exceed the maximum operating pressure of 115 PSI (8 bar). The compressor is equipped with a safety valve to prevent over-pressurization. Do not tamper with or disable this valve.
- Personal Protection: Wear appropriate personal protective equipment (PPE) such as safety glasses and hearing protection when operating the compressor.
- Ventilation: Operate the compressor in a well-ventilated area. Do not block the heat dissipation vents.
- Stability: Place the compressor on a stable, level surface to prevent tipping during operation.
- Children and Pets: Keep children and pets away from the compressor during operation.
- Maintenance: Disconnect the power supply before performing any maintenance or repairs.
3. Product Overview
3.1. Components

Figure 2: Key Components of the VEVOR Air Compressor. This diagram provides a numbered view of the compressor, identifying its main parts for easy reference.
| No. | Component | Description |
|---|---|---|
| 1 | On/Off Switch | Controls the power to the compressor. |
| 2 | Copper Motor | High-efficiency, low-noise motor for air compression. |
| 3 | Handle | Ergonomic handle for easy portability. |
| 4 | Silencer | Reduces operational noise for ultra-quiet performance. |
| 5 | Safety Valve | Automatically releases pressure if it exceeds safe limits. |
| 6 | Outlet Pressure Gauge | Displays the regulated air pressure at the outlet. |
| 7 | Tank Pressure Gauge | Shows the current air pressure inside the tank. |
| 8 | Quick Couplers | For quick and easy connection of air tools. |
| 9 | Rubber Wheels | Durable wheels for smooth movement and transport. |
| 10 | Heat Dissipation Holes | Vents designed to prevent motor overheating. |
| 11 | Solenoid Valve | Ensures safety by releasing pressure when power is off. |
| 12 | Steel Tank | Robust 50-liter tank for compressed air storage. |
4. Setup
4.1. Unpacking
- Carefully remove the compressor from its packaging.
- Inspect the unit for any signs of damage during transit. If damage is found, do not operate and contact customer support.
- Ensure all components listed in the "Contents of the Box" section (1 x Oil-Free Air Compressor, 2 x Gas Nozzles) are present.
4.2. Placement
- Place the compressor on a firm, level surface to ensure stability during operation.
- Ensure adequate clearance around the compressor for proper ventilation and heat dissipation. Do not place it against a wall or in an enclosed space.
- Keep the compressor away from flammable materials, heat sources, and moisture.
4.3. Initial Checks
- Verify that the power cord and plug are in good condition.
- Ensure the drain valve at the bottom of the tank is closed before starting.
- Confirm that the quick couplers are securely attached if you plan to connect air tools immediately.

Figure 3: Portable Design Features. This image illustrates the labor-saving handle and flexible wheels, emphasizing the compressor's ease of movement and setup.
5. Operating Instructions
5.1. Starting the Compressor
- Plug the power cord into a suitable electrical outlet (230V 50Hz).
- Turn the On/Off Switch (1) to the "ON" position. The motor will start, and the tank will begin to fill with air.
- Monitor the Tank Pressure Gauge (7). The compressor will automatically shut off once the maximum pressure (115 PSI / 8 bar) is reached.
5.2. Adjusting Pressure
- To adjust the outlet pressure for your pneumatic tool, use the pressure regulator knob (usually located near the outlet pressure gauge).
- Turn the knob clockwise to increase pressure and counter-clockwise to decrease pressure.
- Read the desired pressure on the Outlet Pressure Gauge (6).
5.3. Shutting Down
- Turn the On/Off Switch (1) to the "OFF" position.
- Disconnect the air hose from the quick coupler.
- Unplug the compressor from the power outlet.
- Slowly open the drain valve at the bottom of the tank to release any condensed moisture and residual air pressure. Close the valve once the tank is empty.
5.4. Applications
This VEVOR air compressor is versatile and suitable for a wide range of tasks:

Figure 4: Versatile Applications. This image showcases various uses for the air compressor, including tire inflation, vehicle repair, house renovation, and powering various air tools like nailers, drills, and paint sprayers.
- Tire Inflation: Quickly inflate car, bicycle, or motorcycle tires.
- Vehicle Repair: Power pneumatic wrenches for automotive tasks.
- House Renovation: Use with nail guns, caulking guns, and paint sprayers for DIY projects.
- Air Tools: Compatible with a variety of air tools such as drills, chisels, and spray guns.
- Cleaning: Can be used for inflating and cleaning tasks.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your air compressor. Always disconnect the power before performing any maintenance.
6.1. General Maintenance
- Cleaning: Keep the compressor clean and free of dust and debris. Wipe down the exterior with a damp cloth.
- Ventilation: Ensure the heat dissipation holes (10) are clear and unobstructed to prevent overheating.
- Cord and Plug: Regularly inspect the power cord and plug for any damage.
6.2. Oil-Free Pump Maintenance
This compressor features an oil-free pump, which significantly reduces maintenance requirements. No oil changes or lubrication are needed for the pump.
6.3. Tank Drainage
Moisture naturally accumulates in the air tank due to condensation. To prevent corrosion and ensure optimal performance, drain the tank daily or after each use.
- Turn off the compressor and unplug it from the power source.
- Place a suitable container under the drain valve located at the bottom of the tank.
- Slowly open the drain valve to release condensed water and air pressure.
- Once all water and air have been expelled, close the drain valve securely.
7. Troubleshooting
Refer to the table below for common issues and their solutions. If the problem persists, contact VEVOR customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Compressor does not start. | No power supply; On/Off switch is off; Thermal overload protector tripped. | Check power connection; Turn On/Off switch to ON; Allow compressor to cool down, then reset. |
| Compressor runs continuously or frequently. | Air leak in hose/fittings; Drain valve open; Pressure switch malfunction. | Check all connections for leaks; Close drain valve; Contact service if pressure switch is faulty. |
| Low air pressure at outlet. | Pressure regulator set too low; Air leak; Clogged air filter (if applicable). | Adjust pressure regulator; Check for leaks; Clean/replace air filter. |
| Excessive noise or vibration. | Loose components; Unstable surface; Worn motor bearings. | Tighten all fasteners; Place on a stable surface; Contact service for motor issues. |
| Air contains water. | Tank not drained regularly. | Drain the tank daily or after each use. |
8. Specifications
| Attribute | Value |
|---|---|
| Model | KYJ-6554 |
| Color | White |
| Body Material | Steel |
| Power | 1 HP / 750 W |
| Tank Capacity | 50 L (11 gallons) |
| Lubrication Type | Oil-Free |
| Voltage | 230 V 50 Hz |
| Current | 3.6 A |
| Rotation Speed | 1450 rpm |
| Max. Pressure | 8 bar (116 Psi) |
| Exhaust Volume | 170 L/min |
| Noise Level | 58 dB |
| Product Dimensions (L x W x H) | 60 x 30 x 59 cm (23.6 x 11.8 x 23.2 in) |
| Weight | 27.6 kg (60.8 lb) |

Figure 5: Product Dimensions. This image provides a visual representation of the compressor's length, width, and height in both inches and centimeters.
9. Warranty and Support
VEVOR products are designed for durability and performance. For warranty information and technical support, please refer to the official VEVOR website or contact their customer service directly.
- Return Policy: This product typically comes with a 30-day refund/replacement policy from the seller. Please check your purchase details for specific terms.
- Contact: For any questions, troubleshooting assistance, or warranty claims, please visit the official VEVOR support page or contact their customer service team.
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