How to Replace the Lock-On Button Spring on a DeWALT Angle Grinder (Model D28402)

If broken parts and faulty starts are grinding on your nerves, it's time to face the fix. Whether you are a grinding pro or seasonal grinder, eReplacementParts.com provides the parts, procedures and facts you need to fearlessly fix what fails you.

The purpose of the lock-on button spring is to reset the button when the grinder is turned off (when the paddle is released). Over time, the spring may lose tension. It's also quite common to lose the entire spring while performing related repairs on the grinder.

Either way, this article will take the tension out of replacing the lock-on button spring in your DeWALT D28402 grinder. Let's get started.

  REMOVING THE SPRING [top] 1. Remove the top half of the handle assembly.

Remove the (5) retaining screws.

Remove the top half of the handle assembly.

  2. Remove the spring.

Remove the paddle assembly.

Remove the lock-on button assembly.

Remove the spring from the lock-on button.

  INSTALLING THE NEW SPRING [top] 3. Install the spring.

Slide the new spring onto the lock-on button.

  REASSEMBLING THE UNIT [top] 4. Reinstall the lock-on button.

One side of the lock-on button contains a small tab. This tab should be installed facing the armature.

Install the lock-on button into the handle.

  5. Reinstall the paddle assembly.

Install the paddle assembly into the handle; ensure that the "tail" is positioned above the switch button, and the "fulcrum" is seated within the recess in the handle.

  6. Reinstall the top half of the handle assembly.

Partially install the top half of the handle assembly.

Align the posts (on the fulcrum and the lock-on button) with the recesses in the top of the handle.

Before securing the handle with the screws, test the paddle and the lock-on button for proper functionality.

Secure the handle with the screws.

You can't place a value on a job well done, unless you did it yourself. (Which you did.) Now you can place that value back into your own pocket. (Or into your business.) Not only did you refine your grinder at a fraction of the cost of replacement; you have expanded your skills far beyond the daily grind.

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