Dewalt Air Compressor Problems

Key Takeaways

  • Regular maintenance of your DeWalt air compressor is crucial to prevent common issues and ensure optimal performance.
  • When troubleshooting problems with your DeWalt air compressor, start by identifying the specific issue and referring to the manufacturer’s manual for guidance.
  • If your DeWalt D55146 air compressor is experiencing issues, such as overheating or pressure fluctuations, check the motor, valves, and hoses for possible malfunctions.
  • If your DeWalt air compressor fails to start, inspect the power source, pressure switch, and electrical connections for any faults before attempting to restart.
  • To address low pressure or failure to build pressure in your DeWalt air compressor, check for leaks, clean or replace filters, and adjust the regulator settings as needed.
  • Implementing a regular maintenance schedule that includes cleaning, lubrication, and inspection of key components can help extend the lifespan of your DeWalt air compressor and prevent future problems.

Understanding How DeWalt Air Compressors Work

Motor Malfunctions

DeWalt air compressors rely on a motor to drive the piston, which compresses air into the storage tank. If the motor malfunctions, it can lead to issues with the compression process and impact the overall performance of the compressor. This might result in reduced airflow or irregular air pressure output.

  • Pros:

    • Easily identifiable issue
    • Can be repaired by replacing the motor
  • Cons:

    • Costly repair if not under warranty

Valve Blockages

When using a DeWalt air compressor, valve blockages can occur due to debris or dirt buildup within the system. These blockages can hinder the release of compressed air when needed for various applications. As a result, you may experience inconsistent airflow or difficulty operating pneumatic tools effectively.

  • Key Information:
    • Regular maintenance can prevent valve blockages
    • Cleaning valves periodically is essential for optimal performance
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Identifying Common Problems with DeWalt Air Compressors

Leaking Air from Fittings or Hoses

If you notice leaking air from the fittings or hoses of your DeWalt air compressor, it could mean there are issues with the seals or connections. This can lead to a drop in pressure and affect the overall performance of the compressor. To address this problem, check for any visible damage to the fittings, tighten connections securely, and replace any worn-out seals.

Unusual Noises

Unusual noises, like grinding or knocking sounds coming from your DeWalt air compressor, might indicate underlying problems with the motor or internal components. These noises can be disruptive and may signal potential damage within the compressor. It’s crucial to investigate these sounds promptly by inspecting the motor and components for any signs of wear, tear, or misalignment.

Failure to Start or Maintain Pressure

Experiencing difficulties starting your DeWalt air compressor or noticing a failure to maintain pressure could point towards a malfunctioning pressure switch or regulator. When these components fail, they can disrupt the airflow and impact the compression process. To troubleshoot this issue effectively, consider checking and replacing faulty switches or regulators as needed.

Troubleshooting DeWalt Air Compressor Issues

Power Supply Problems

If your air compressor won’t start, it might be due to power supply issues like tripped breakers or blown fuses. Check these components first before moving on to other troubleshooting steps. Ensuring a steady power source is crucial for the proper functioning of your compressor.

Regularly inspecting and cleaning or replacing the air filter is essential to maintain proper airflow in your air compressor. A clogged air filter can restrict airflow, leading to performance issues with the machine. By keeping the air filter clean, you can prevent potential problems down the line.

Pressure Switch Adjustment

Verifying that the pressure switch on your air compressor is correctly set is vital for maintaining desired pressure levels during operation. If necessary, adjust the pressure switch according to the manufacturer’s recommendations to ensure optimal performance from your compressor.

Diagnosing DeWalt D55146 Air Compressor Issues

Overheating Problems

DeWalt D55146 air compressors may overheat due to poor ventilation or prolonged use. Ensure the compressor has ample space around it for proper airflow. If overheating persists, consider giving the compressor breaks during extended usage.

  • Inadequate ventilation can lead to overheating.
  • Prolonged use without breaks can also cause overheating issues.
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Faulty Check Valves

Faulty check valves in the D55146 model can result in air leaks and prevent the compressor from reaching optimal pressure levels. Inspect the check valves for any signs of wear or damage, and replace them if necessary.

  • Air leaks are common with faulty check valves.
  • Damaged check valves hinder pressure build-up.

Pump Assembly Concerns

Issues with the pump assembly, such as worn-out pistons or damaged cylinders, significantly impact the overall performance of a DeWalt D55146 air compressor. Regular maintenance checks on these components are essential to ensure smooth operation.

  • Worn-out pistons affect compression efficiency.
  • Damaged cylinders can lead to decreased air output.

Why Your DeWalt Air Compressor May Not Start

Defective Power Cord or Switch

If your DeWalt air compressor fails to start, a common culprit could be a faulty electric motor. A defective power cord or switch might disrupt the flow of electricity needed to kickstart the compressor. Check for any visible damage or loose connections in these components.

  • Inspect power cord and switch for damage
  • Ensure proper connection of the power supply

Low Oil Levels Triggering Safety Mechanisms

Another reason your DeWalt air compressor may not start is due to low oil levels in the electric motor. When the oil level drops below a certain point, safety mechanisms can activate, preventing the compressor from turning on as a protective measure.

  • Regularly check and maintain oil levels
  • Follow manufacturer’s guidelines for oil changes

Motor Capacitor Failure

Motor capacitor failure is another prevalent issue that can hinder your air compressor from starting. The capacitor plays a crucial role in providing the initial jolt needed to get the motor running smoothly. If this component malfunctions, it can lead to an inability to start the compressor altogether.

  • Test capacitor functionality with a multimeter
  • Replace capacitor if necessary
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Solutions for DeWalt Air Compressors Not Building Pressure

Check for Air Leaks

Air leaks in fittings, hoses, or the tank can prevent your DeWalt air compressor from building pressure. Look for damaged components and replace them to fix the issue. For instance, a cracked hose or loose fitting could be causing the problem.

Inspecting the entire system thoroughly is crucial to identify any potential leaks that might be hindering pressure buildup. By fixing these leaks promptly, you can ensure optimal performance of your air compressor and avoid further problems.

Clean or Replace Filters

Clogged filters can restrict airflow in your DeWalt air compressor, leading to a loss of pressure buildup. Regularly cleaning or replacing filters is essential to maintain proper airflow within the system and prevent pressure issues. A dirty filter can significantly impact the compressor’s efficiency.

Ensuring that filters are clean and free from debris allows air to flow smoothly through the system, enabling the compressor to reach its intended pressure levels efficiently.

Maintenance Tips to Prevent Future Problems

Regular Draining of Moisture

To prevent corrosion and extend the compressor’s life, make sure to drain moisture from the air tank regularly. This simple step helps in maintaining the quality of the compressed air and prevents potential issues down the line.

  • Draining moisture prevents corrosion
  • Extends compressor lifespan

Keep Compressor Clean

Regularly cleaning your DeWalt air compressor by removing dust and debris from various components is crucial. By keeping the motor, cooling fins, and other parts clean, you ensure optimal performance and prevent overheating or damage.

  • Cleaning prevents overheating
  • Ensures optimal performance


You’ve now gained a comprehensive understanding of how DeWalt air compressors work, common issues they face, troubleshooting techniques, and maintenance tips to keep them running smoothly. By diagnosing problems early on and implementing the solutions provided, you can ensure that your DeWalt air compressor remains in top condition and continues to serve you effectively.

Remember, regular maintenance is key to preventing future problems with your air compressor. By following the maintenance tips outlined in this guide, you can extend the lifespan of your equipment and avoid costly repairs down the line. Stay proactive in addressing any issues that arise, and your DeWalt air compressor will be a reliable tool for your projects for years to come.