i dropped my impact wrench and now the trigger feels loose and doesn't always engage. did i just kill a $300 tool?

Diagnosis

The Makita DTW1002Z utilizes a plastic trigger lever that acts as a mechanical bridge to depress a micro-switch assembly. When the tool suffers a high-impact drop, the shock often causes the trigger pivot pins to shift or the plastic mounting tabs on the trigger housing to fracture. If the trigger feels "mushy" or loose, it means the mechanical leverage is lost; the trigger is moving, but it is no longer applying direct pressure to the electrical switch, or the return spring has slipped out of its seat. To confirm this, perform a "tactile test": press the trigger slowly and feel for a distinct "click" or resistance point. If the trigger moves freely through its entire arc without a tactile snap, the trigger lever is likely cracked or disconnected from the switch. If the tool intermittently works when you squeeze the trigger at a specific angle, the switch itself is likely intact, but the plastic actuator is misaligned or broken.

How to Fix It

You can typically resolve this without replacing the entire motor assembly. You will need a T10 Torx driver and a small flat-head screwdriver.

1. Remove the battery and clear the workspace. Use the T10 Torx to remove the housing screws. Note that some screws may be hidden beneath the LXT labels or rubberized grip pads; peel these back carefully to expose the screw heads.
2. Carefully split the clamshell housing. Be mindful of the wiring harness connecting the variable speed dial to the main board; do not yank the two halves apart violently.
3. Locate the trigger assembly. Inspect the plastic pivot points and the small tension spring. If the spring has popped out of its notch, use needle-nose pliers to reseat it into the trigger arm.
4. Inspect the trigger lever for hairline fractures. If the plastic is cracked, you can perform a temporary fix using a two-part epoxy or a plastic weld, but for a permanent fix, you must replace the trigger switch assembly (Part No. 194541-0).
5. If the switch is intact but shifted, realign the trigger lever so it sits flush against the micro-switch plunger.
6. Reassemble the housing, ensuring no wires are pinched between the plastic shells. Tighten the screws firmly but do not over-torque, as the plastic bosses can strip easily.

If That Didn't Work

• Replace the Switch Assembly: If the internal micro-switch has a broken solder joint or a collapsed spring from the impact, the entire switch module (194541-0) needs replacement. This is a plug-and-play component that replaces the trigger and the electrical contact block.
• Check the Variable Speed Dial: Sometimes the impact knocks the speed selector dial out of alignment, creating a gap that makes the trigger feel loose. Ensure the dial is fully seated and clicking into its designated speed settings.
• Inspect the Housing Alignment: If the plastic shell cracked during the drop, the two halves of the tool may be slightly offset. This misalignment can put pressure on the trigger, preventing it from traveling fully. Check for cracks in the outer casing and use a heavy-duty plastic adhesive if the shell is compromised.
• Contact Cleaning: If the trigger engages but the tool stutters, the impact may have loosened the battery terminal contacts. Use a contact cleaner spray on the 18V LXT battery rails to ensure a consistent electrical connection.

Heads Up

• Avoid using "liquid solder" or superglue on the trigger pivot points; these can seep into the electrical switch and permanently seize the mechanism.
• Always check the integrity of the rubber grip pads after reassembly; if they aren't seated correctly, moisture can enter the housing and short the circuit board.
• When replacing the switch, ensure you use a low-wattage soldering iron if you are doing manual wire repairs to avoid melting the surrounding plastic housing.
• Regularly inspect the trigger for debris; sawdust or metal shavings can get lodged in the trigger gap, mimicking the "loose" feeling of a broken switch.