If the gear box on your DeWalt grinder wears down or fails, you will want to replace it. A grinder with worn gears may not spin at the proper RPM--if it spins at all--so replacing the gear box will help you bring the grinder's performance to like-new levels.
Remember to use our DeWalt parts finder to find all the right parts for your DeWalt tools.
1. Remove the grinder accessories
Unscrew the handle.
Remove the grinding wheel.
Release the tension on the guard and remove it.
2. Remove the gear box cover
Remove the four screws that secure the gear box cover. Be sure you get the gasket along with the cover.
3. Remove the gear box
Remove the four screws that fasten the gear box to the body, then slide the gear box away from the grinder.
4. Install the new gear box
Slide the new gear box into place and be sure the gears mesh. Then fasten the gear box with the screws.
5. Install the cover
Now you can install the old cover onto the new gear box.
6. Re-install the accessories
Re-attach the handle, guard, and grinding wheel to finalize the repair.
Conclusion
Replacing the gear box on your DeWalt D28402 grinder only takes about 10 minutes and will get you back to work for a lot less than a repair shop. Learning how the gear box works can also help you with diagnosing basic gear problems with your grinder.
Remember to use our model number search engine to find the OEM parts designed for all your power tools.
