Clean, Replace Contact Motor Brushes

Contact Motor Brushes

While many modern power tools utilize brushless motors, numerous corded and older models still rely on brushed motors. Proper maintenance of these tools ensures longevity and optimal performance.

Routine Cleaning Tips

  • Post-Use Cleaning: After each use, gently blow air through the tool's vents to remove dust and debris. This practice helps keep the motor cool and extends the life of the brushes.
  • Avoid Compressed Air: Using high-pressure air can force debris deeper into the tool, potentially causing damage. Instead, opt for a soft brush or low-pressure air.

Identifying Worn Brushes

Brushed motors contain carbon brushes that wear down over time. Signs that indicate it's time to replace them include:

  • Reduced Performance: The tool doesn't operate as efficiently as before.
  • Excessive Sparking: While minor sparks are normal, a noticeable increase suggests worn brushes.
  • Intermittent Operation: The tool starts and stops unexpectedly during use

Replacing Carbon Brushes

  1. 1
    Safety First: Ensure the tool is unplugged or the battery is removed.
  2. 2
    Access the Brushes: Depending on the model, you might need to remove the housing or access specific brush caps.
  3. 3
    Remove Old Brushes: Carefully take out the worn brushes.
  4. 4
    Install New Brushes: Insert the new brushes, ensuring they fit snugly and make proper contact.
  5. 5
    Reassemble and Test: Put the tool back together and test its operation.

Note: Always consult your tool's manual for specific instructions and part numbers.

Brushless vs. Brushed Motors

Brushless motors are becoming increasingly popular due to their efficiency and low maintenance. Advantages include

  • Longer Lifespan: No brushes mean fewer parts to wear out.
  • Improved Efficiency: Better power-to-weight ratio and performance.
  • Reduced Maintenance: Less frequent servicing compared to brushed motors.

However, brushed motors are still prevalent in many tools and, with proper maintenance, can offer years of reliable service.

Final Thoughts

Regular maintenance, including cleaning and timely replacement of brushes, ensures your power tools remain in top condition. While brushless motors offer advantages, understanding and caring for brushed motors can significantly extend their usability.