1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your genuine WORX WU172 or WU179 20V Charging Drill DC Motor. This motor is designed as a replacement component for compatible WORX 20V charging drills. Please read these instructions carefully before proceeding with any installation or service to ensure safe and effective use.
2. Product Overview
The WORX WU172/WU179 motor is a genuine replacement DC motor assembly, specifically engineered for WORX 20V charging drills. It includes the motor unit with an integrated gear, ready for installation.


3. Specifications
| Feature | Detail |
|---|---|
| Model Numbers | WU172, WU179 |
| Part Description | Motor Assembly |
| Part Number | 50032914 |
| Compatibility | WORX 20V Charging Drills |
| Motor Type | DC Motor with Gears |
| DIY Supplies Category | Electrical |
| Origin | Mainland China (Positec Machinery) |
| High-concerned chemical | None |
| Certification | None specified |
| Approx. Package Dimensions (L x W x H) | 22 cm x 22 cm x 11 cm |
| Approx. Package Weight | 0.6 kg |
4. Setup and Installation
This motor is a replacement part and requires installation into a compatible WORX 20V charging drill. Installation should only be performed by individuals with appropriate technical knowledge and experience in power tool repair.
Safety Precautions:
- Always disconnect the drill from its power source (remove the battery pack) before attempting any installation or maintenance.
- Wear appropriate personal protective equipment, including safety glasses and gloves.
- Ensure your workspace is clean, well-lit, and free from obstructions.
- Keep children and bystanders away from the work area.
Installation Steps (General Guidance):
- **Disassembly**: Carefully disassemble your WORX 20V charging drill according to its specific service manual or common power tool repair practices. This typically involves removing screws to open the casing.
- **Motor Removal**: Disconnect the wiring from the old motor and carefully remove it from its housing. Note the orientation and connection points.
- **New Motor Installation**:
- Ensure the new WU172/WU179 motor aligns correctly with the gearbox and housing.
- Connect the motor's electrical wires to the drill's internal wiring, ensuring correct polarity and secure connections.
- Verify that the motor's gear meshes properly with the drill's internal gearing.
- **Reassembly**: Carefully reassemble the drill casing, ensuring all wires are tucked away safely and no components are pinched. Secure all screws.
- **Testing**: Reinsert the battery pack and perform a brief test run of the drill at a low speed to ensure proper function before full use.
Note: Specific disassembly and reassembly procedures may vary by drill model. Refer to your specific drill's service manual for detailed instructions.
5. Operating Instructions
As a component part, the WORX WU172/WU179 motor does not have standalone operating instructions. Its function is integrated into the WORX 20V charging drill. Please refer to the instruction manual provided with your specific WORX 20V charging drill for detailed operating procedures, safety guidelines, and usage recommendations.
6. Maintenance
Proper maintenance can extend the lifespan of your motor and the drill it powers.
- **Cleaning**: Periodically clean the exterior of the drill to prevent dust and debris from entering the motor housing. Use a soft, dry cloth. Avoid using solvents or harsh chemicals.
- **Inspection**: Regularly inspect the drill for any signs of wear, damage, or loose components. Pay attention to unusual noises or vibrations during operation, which could indicate motor issues.
- **Ventilation**: Ensure the drill's ventilation openings are clear to prevent overheating of the motor.
- **Storage**: Store the drill in a clean, dry place away from extreme temperatures and humidity.
Note: Do not attempt to open the motor housing itself for maintenance, as this may void any warranty and could damage the internal components.
7. Troubleshooting
If your WORX 20V charging drill experiences issues after motor replacement, consider the following troubleshooting steps:
- **No Power/Motor Not Spinning**:
- Ensure the battery pack is fully charged and properly inserted.
- Check all electrical connections to the motor for looseness or incorrect wiring.
- Verify that the drill's trigger switch is functioning correctly.
- **Unusual Noise/Vibration**:
- Re-check the motor's seating within the housing and its engagement with the gearbox. Misalignment can cause noise.
- Inspect for any foreign objects inside the drill casing.
- **Overheating**:
- Ensure ventilation ports are clear.
- Avoid continuous heavy-duty operation without breaks.
- **Motor Runs, but Drill Doesn't Turn**:
- This indicates a problem with the gearbox or clutch mechanism, not the motor itself.
If issues persist after troubleshooting, it is recommended to consult a qualified power tool repair technician or contact WORX customer support.
8. User Tips
While no specific user tips were available from reviews or Q&A for this particular motor, general advice for replacement parts includes:
- **Verify Compatibility**: Always double-check the model numbers (WU172 or WU179) and voltage (20V) to ensure this motor is the correct replacement for your specific WORX drill.
- **Document Disassembly**: Take photos or videos during the disassembly process of your old drill. This can be invaluable for correct reassembly.
- **Clean Internal Components**: Before installing the new motor, take the opportunity to clean any accumulated dust or debris from the drill's internal components.
9. Warranty and Support
This product is described as "Genuine Manufacturers Parts" from Positec Machinery (China) Co., Ltd., the manufacturer of WORX tools.
For warranty information regarding WORX products, please refer to the official WORX website or the documentation that came with your original WORX tool. As a replacement part, its warranty may be subject to specific terms and conditions.
Seller Contact Information:
For direct support related to your purchase from V78Jia Store, you may contact the seller:
- Email: v784914676@126.com
- WhatsApp: +8615348300302
Please have your purchase details ready when contacting support.





