the forward/reverse selector on my impact wrench is super stiff and sometimes gets stuck in the middle. did i break it?

Diagnosis

The stiffness or "centering" issue in the Makita DTW1002Z selector switch is rarely a sign of a broken internal gear or snapped plastic. Instead, it is almost always caused by the accumulation of "industrial sludge"—a mixture of fine metallic dust from bolts, airborne grit, and the original factory lithium grease that has thickened or contaminated over time. This debris settles into the detent spring mechanism, which is the small spring-loaded ball that locks the switch into the Forward, Reverse, or Neutral positions. When this grit builds up, it creates excessive friction and prevents the detent ball from seating fully into its designated notch. If the switch gets stuck in the middle, it means the detent is hanging up on a piece of debris, leaving the internal trigger contacts in a "floating" state where the tool will not engage the motor. You can confirm this by attempting to toggle the switch while the tool is off; if you feel a "gritty" sensation or a lack of a sharp "click" when shifting, the mechanism is contaminated rather than mechanically failed.

How to Fix It

To restore the smooth action of the selector, you need to chemically flush the detent mechanism without dismantling the housing. Follow these precise steps:

1. Remove the 18V LXT battery and any socket adapters from the anvil to ensure a clear workspace.
2. Position the tool so the selector switch is facing slightly downward.
3. Using a high-pressure can of electrical contact cleaner (such as WD-40 Specialist Fast Acting Contact Cleaner), insert the straw directly into the narrow gap between the selector slider and the main plastic housing.
4. Spray in short, aggressive bursts for 3-5 seconds while simultaneously sliding the switch rapidly back and forth from full forward to full reverse. This mechanical agitation breaks up the solidified grease and grit.
5. Repeat the spraying and toggling process at least four times. You will likely see a dark, grayish liquid dripping from the switch—this is the contaminated lubricant leaving the tool.
6. Allow the solvent to evaporate completely for 10 minutes.
7. Apply a single drop of high-quality synthetic lubricant or a tiny amount of white lithium grease to the exterior of the slider, then work it back and forth one last time to ensure the metal-on-metal contact is lubricated.

If That Didn't Work

• Deep Solvent Soak: If the switch remains stiff, the debris may be packed too tightly for a surface spray. Submerge just the selector switch area in a small container of isopropyl alcohol (90% or higher) for 30 minutes, then toggle the switch repeatedly while submerged to dissolve the stubborn grime.
• Compressed Air Purge: Use an air compressor with a blow-gun attachment. Set the regulator to approximately 90 PSI and blow air directly into the switch gaps from multiple angles. This often pushes out larger particles of metal shavings that chemical cleaners cannot dissolve.
• Housing Inspection: Check the exterior plastic casing around the switch for any "mushrooming" or cracks. If the tool was dropped, the plastic housing may have shifted slightly, pinching the slider. Use a fine-grit sandpaper or a deburring tool to shave down any protruding plastic burrs that are obstructing the slider's path.
• Internal Component Replacement: If the switch still fails to click into place, the internal detent spring may have lost its tension. In this case, the tool requires a teardown to replace the selector assembly. This involves removing the housing screws and replacing the switch module (Part No. varies by region, typically found in the trigger assembly kit).

Heads Up

• Avoid Heavy Oils: Never use standard WD-40 Multi-Use Product or heavy motor oil to lubricate the switch. These attract dust and will turn into a thick paste over time, making the sticking problem significantly worse.
• Battery Safety: Always ensure the battery is removed before applying any liquid cleaners or solvents to prevent short-circuiting the internal electronics.
• Avoid Over-Tightening: If you disassemble the housing to clean the switch, do not over-torque the housing screws upon reassembly; over-tightening can warp the plastic shell and put permanent pressure on the selector slider.
• Regular Maintenance: In high-dust environments (like automotive shops), blow out the selector switch with compressed air once every two weeks to prevent debris buildup from reaching a critical mass.