The Dewalt DWE6421 is a popular random orbital sander known for its performance and versatility. However, occasionally users may encounter a problem where the sander starts spinning at a high speed, resulting in gouges on the wood surface.

dewalt dwe6421
dewalt dwe6421

In this article, we will explore the causes behind this issue, provide troubleshooting tips, and offer preventive measures to ensure the optimal performance of your Dewalt random orbital sander.

Features of Dewalt DWE6421:

The Dewalt DWE6421 is a high-quality random orbital sander that offers several features to enhance user experience:

  1. Variable Speed Control: The sander allows users to adjust the speed according to their sanding needs, providing versatility for different projects.
  2. Efficient Dust Collection: Equipped with a built-in dust collection system, the sander helps maintain a clean work environment by capturing dust particles during operation.
  3. Comfortable Grip: The sander features a rubberized grip that reduces hand fatigue and provides better control during extended sanding sessions.

How to Fix Dewalt Random Orbital Sander DWE6421 Racing:

If you suspect a bearing issue, it is advisable to seek professional help to replace the bearing. Attempting to repair the bearing yourself may lead to further damage. Contact Dewalt customer support or consult a qualified technician for assistance.

If the problem persists despite troubleshooting, consider sending your sander to an authorized service center for a comprehensive inspection and repair.


  1. Bearing Issues: One possible cause for the sander racing at high RPMs and making a high-pitched noise could be a problem with the bearing. A damaged or worn-out bearing can lead to increased speed and irregular patterns.
  2. Power Supply: Insufficient power supply or fluctuations in the electrical current can cause the sander to spin at an abnormally high speed, leading to undesirable results.
  3. Dust Accumulation: Excessive dust accumulation in the motor housing or around the bearing area can cause friction, leading to a faster rotation of the sanding pad.


  1. Check the Bearing: Begin troubleshooting by inspecting the bearing for any signs of damage or wear. If the bearing appears to be damaged, it may need to be replaced. Contact Dewalt customer support or a professional repair service for assistance.
  2. Power Supply Stability: Ensure that your sander is receiving a stable power supply. Use a surge protector or consider connecting the sander to a different power outlet to eliminate any electrical issues.
  3. Clean the Sander: Regularly clean the motor housing and the area around the bearing to remove any dust or debris. Use compressed air or a soft brush to clean these areas thoroughly.

Preventing the Problem:

  1. Regular Maintenance: Perform regular maintenance on your Dewalt random orbital sander. This includes cleaning the sander, lubricating the bearing (if applicable), and following the manufacturer’s recommended maintenance schedule.
  2. Dust Extraction: Use a dust extraction system or a vacuum attachment specifically designed for your sander to minimize dust accumulation. Keeping the sander clean will help prevent issues caused by excessive dust.
  3. Proper Handling: Avoid excessive pressure on the sander when sanding. Let the weight of the sander and the sanding pad do the work. Applying excessive pressure can strain the motor and potentially lead to speed issues.

The Dewalt DWE6421 random orbital sander is a reliable tool that occasionally may encounter issues such as racing at high RPMs. By understanding the causes, following troubleshooting steps, and implementing preventive measures, you can maintain the optimal performance of your sander. Remember to seek professional assistance when necessary and always prioritize safety while handling power tools.
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By Jake Anderson

Iā€™m Jake Anderson who is passionate about technology, reading books, blogging and sports. If you want to read my blog you can read my profile creation blog.

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