can i get my milwaukee drill fixed under warranty if i tried to open it up myself?

Diagnosis

Opening the chassis of a Milwaukee M18 2801-20 Drill Driver without authorization constitutes a "tamper event" in the eyes of the manufacturer. The root cause of your warranty denial is the breach of the sealed housing. When you remove the T10 Torx screws and separate the clamshell halves of the motor housing, you are bypassing the factory seal. Milwaukee's warranty terms are strictly based on manufacturing defects; once the internal components—such as the planetary gear set, the trigger switch, or the motor brushes—are exposed to an unauthorized party, the manufacturer can no longer verify if the failure was caused by a defect or by user-induced damage, such as stripping a gear or shorting a terminal.

To confirm if your warranty is officially void, check for any stripped screw heads or scuff marks on the plastic housing edges where the casing meets. Authorized technicians at Milwaukee Service Centers are trained to spot "amateur" entries by looking for rounded-off Torx heads or missing internal wire clips. If you have already removed the motor or attempted to lubricate the gears with a non-factory grease, the tool will be flagged as "customer altered," which automatically disqualifies it from the standard limited warranty coverage.

How to Fix It

Since the warranty is likely voided, your goal is now to get the tool back into working order via a paid professional repair or a strategic "honest" submission. Follow these steps precisely:

1. Reassemble the Unit: Before sending the tool anywhere, ensure it is fully reassembled. A tool sent in pieces is often treated as "scrap" or charged a higher diagnostic fee. Use the correct T10 Torx driver to ensure screws are seated firmly but not over-torqued, which would further prove tampering.
2. Locate an Authorized Service Center (ASC): Do not go to a general hardware store. Use the Milwaukee Tool Service Center locator to find a factory-certified station. These centers have the specific replacement parts for the 2801-20 model, such as the exact replacement trigger assembly or the specific planetary gear kit.
3. Initiate a "Paid Repair" Request: When filling out the service form, do not claim it is a warranty repair. Mark it as "Out of Warranty" or "Paid Service." This prevents the technician from spending time searching for a warranty claim that will inevitably be rejected, which can sometimes reduce the initial diagnostic fee.
4. Specify the Symptom: Be extremely precise. Instead of saying "it doesn't work," state "The motor engages but the chuck does not rotate" or "The trigger switch is intermittent." This allows the tech to order the correct parts (e.g., the gear head assembly) before the tool even arrives.
5. Payment Authorization: Be prepared to pay a diagnostic fee (typically $25-$50) which is usually applied toward the final cost of the repair.

If That Didn't Work

If the Authorized Service Center refuses to work on a tampered tool or the cost of repair exceeds 60% of the tool's original value, consider these alternatives:

• Independent Tool Repair Specialists: Look for local shops that specialize in power tool refurbishment. They do not care about warranty seals and can often source generic high-quality bearings or carbon brushes that are compatible with the M18 platform, often at a lower labor rate than the factory.
• Component Sourcing: If you are comfortable with the mechanical side, purchase a "donor" 2801-20 from a liquidator or eBay that has a dead motor but a functional gear assembly. You can swap the internal components yourself to get a working tool.
• Trigger Switch Replacement: If the issue is electrical, the trigger switch is the most common failure point on the 2801-20. You can find third-party replacement switches online. Replace the entire switch module rather than attempting to clean the contacts, as the plastic housing on these switches is prone to cracking.
• Gearbox Overhaul: If the tool is making a grinding noise, the planetary gears may be stripped. You can purchase the gear head assembly as a single unit. Avoid adding excessive lithium grease, as too much grease can migrate into the motor windings and cause overheating.

Heads Up

• Avoid "Quick Fixes": Never use WD-40 or penetrating oils inside the gearbox; these dissolve the factory grease and will lead to total gear failure within a few uses.
• Battery Safety: While the drill warranty may be void, your M18 batteries usually have a separate warranty. Do not open the battery packs, as this is a significant fire hazard and will definitely void the battery warranty.
• Screw Integrity: Always use a precision-fit Torx T10. Using a flathead or a poorly fitting hex key will strip the screws, making it impossible to open the tool again without drilling the screws out.
• Cleanliness: If you open the tool in the future, use compressed air to blow out the motor vents. Dust buildup in the 2801-20 can lead to premature brush wear and motor burnout.