the forward/reverse switch on my dcd771 is super stiff and sometimes gets stuck in the middle

Diagnosis

The stiffness or "middle-sticking" of the forward/reverse slider on the DeWalt DCD771C2 is almost always caused by an accumulation of particulate matter—specifically fine sawdust, drywall compound, or metallic filings—that has migrated past the external housing of the switch. The DCD771 uses a sliding mechanical actuator that engages a set of internal microswitches. When grit enters the narrow gap between the slider and the tool casing, it creates friction that resists the spring-loaded return of the switch. If the switch sticks in the center (neutral), it means the actuator is physically wedged or the internal spring tension is being overcome by debris. This is a critical failure point because if the switch remains in the center position, the trigger will not engage the motor, leading the user to believe the battery is dead or the tool has suffered a total electrical failure. You can confirm this by attempting to move the switch while the tool is off; if you feel a "gritty" sensation or a hard stop before the switch fully clicks into the forward or reverse position, the mechanism is contaminated.

How to Fix It

To restore the smooth operation of the DCD771 slider without fully dismantling the gear housing, follow these precision cleaning steps:

1. Remove the 20V Max battery pack immediately to ensure no accidental trigger pulls occur during the cleaning process.
2. Use a high-pressure can of compressed air with the narrow straw attachment. Insert the straw into the gap between the slider and the tool body. Blast air from the left side toward the right, and then from the right toward the left, focusing specifically on the base of the slider where debris tends to settle.
3. Apply a non-conductive, fast-evaporating electrical contact cleaner (such as CRC QD Contact Cleaner). Do not use WD-40 or silicone lubricants, as these attract more dust and will create a "sludge" that worsens the sticking over time.
4. Spray the cleaner directly into the crevices around the switch. While the solvent is still wet, rapidly toggle the switch back and forth between forward and reverse 20 to 30 times. This action flushes out the loosened grit and cleans the contact points of the internal microswitches.
5. Use a clean, dry microfiber cloth to wipe away any residue that has been pushed out of the switch housing.
6. Allow the tool to air-dry for at least 10 minutes to ensure the solvent has completely evaporated before reinserting the battery and testing the trigger.

If That Didn't Work

• Deep Internal Cleaning: If the slider remains stiff, the debris has likely migrated inside the plastic shell. You will need to remove the outer casing screws (typically T15 Torx) to access the switch assembly. Once the shell is open, use a soft-bristled brush to manually remove packed dust from the slider rail before reapplying contact cleaner.
• Switch Replacement: If the switch continues to stick in the center despite cleaning, the internal return spring may have snapped or the plastic guide rail has worn down. In this case, the entire forward/reverse switch assembly needs to be replaced. Search for the specific DCD771 replacement switch part to ensure compatibility with the 20V Max circuitry.
• Checking for Housing Warpage: Inspect the plastic casing around the switch for any cracks or deformations, especially if the tool has been dropped. A warped housing can pinch the slider, making it feel stiff regardless of cleanliness. If the plastic is pinched, you can carefully shave a fraction of a millimeter of plastic from the inner guide using a small needle file.

Heads Up

• Avoid using oil-based lubricants on the switch; these act as magnets for construction dust and will lead to a permanent jam.
• Always blow out your tools with compressed air after working in high-dust environments like drywall sanding or masonry drilling to prevent this issue.
• Never force the switch into position if it feels stuck; doing so can snap the internal plastic tabs or crush the microswitches, requiring a full assembly replacement.
• Ensure the battery is removed before applying any liquid cleaners to avoid shorting the control board.