If you own a Bosch GWS 7-100 grinder, you know how reliable and powerful it can be for your DIY and professional projects. However, over time, the carbon brushes in your grinder may wear out, leading to performance issues or a complete failure to power on. Don’t worry—replacing the carbon brushes is an easy and cost-effective fix that you can do yourself. In this guide, we’ll walk you through the steps to replace the carbon brushes and get your grinder working like new ones.
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| Replace Carbon Brushes on a Bosch GWS 7-100 Grinder |
Why Replace Carbon Brushes?
Carbon brushes are essential components in power tools like grinders. They conduct electricity between stationary wires and moving parts in the motor. Over time, these brushes wear down due to friction and need replacement. Signs of worn-out carbon brushes include:
- The grinder not turning on.
- Weak performance or erratic operation.
- Sparks or unusual noises from the motor.
- Replacing the brushes promptly can restore performance and extend the life of your grinder.
What You’ll Need
Before starting, gather these tools and materials:
- Replacement carbon brushes (preferably the correct size: 6.5 × 8 × 14 mm for the Bosch GWS 7-100).
- Screwdriver (flathead or Phillips, depending on your grinder).
- A clean workspace with good lighting.
Step-by-Step Instructions
Step 1: Turn Off and Unplug the Grinder
Safety first! Ensure the grinder is unplugged from the power supply to avoid accidental injuries while working on it.
Step 2: Open the Carbon Brush Covers
Locate the carbon brush covers on both sides of the grinder. Use your screwdriver to carefully remove the screws and open the covers. Set the screws aside in a safe place.
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| Use a screwdriver to open the cover on both sides. |
Step 3: Remove the Old Carbon Brushes
Disconnect the wires connected to the carbon brushes. Gently pull out the worn brushes from their slots. If they are stuck, use a small tool to carefully dislodge them.
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| Remove the carbon brush on both sides. |
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| The old carbon brush is worn out. |
Step 4: Compare the Replacement Brushes
Before installing the new brushes, compare them with the old ones to ensure they are the correct size. In the video, a slightly incorrect size (5 × 8 × 15 mm) was used, which worked but resulted in reduced performance. For optimal results, always use brushes that match the original specifications.
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| Difference size or carbon brush. |
Step 5: Install the New Carbon Brushes
Place the new brushes into the slots, ensuring they sit securely. Reconnect the wires to the brushes, making sure the connections are tight.
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| Replace the new carbon brush on both sides. |
Step 6: Reassemble the Covers
Replace the covers and secure them with the screws. Double-check that everything is tightened properly.
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| Install back the covers. |
Step 7: Test the Grinder
Plug in the grinder and switch it on. If the replacement was done correctly, the grinder should operate smoothly and efficiently.
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| The grinder is working well. |
Pro Tips for Success
- Always double-check the size of the replacement brushes to match the original ones.
- Regularly inspect your grinder for signs of wear and tear to maintain its performance.
- Keep your workspace clean to avoid losing small components like screws.
Conclusion
Replacing the carbon brushes on your Bosch GWS 7-100 grinder is a simple task that can save you time and money while keeping your tool in top condition. Whether you’re a DIY enthusiast or a professional, knowing how to perform this basic maintenance can enhance your grinder’s performance and lifespan.
Tools and components
Shopee:
Lazada:
Aliexpress:
Video
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