Introduction
This manual provides essential instructions for the safe operation, maintenance, and troubleshooting of your Milwaukee 2504-20 1/2" Hammer Drill. Please read this manual thoroughly before using the tool to ensure proper handling and to prevent injury or damage.
General Safety Information
Always follow basic safety precautions when using power tools to reduce the risk of fire, electric shock, and personal injury. Keep your work area clean and well-lit. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Keep children and bystanders away while operating a power tool. Wear appropriate personal protective equipment, including eye protection, hearing protection, and gloves.
- Electrical Safety: Avoid body contact with earthed or grounded surfaces. Do not expose power tools to rain or wet conditions.
- Personal Safety: Stay alert, watch what you are doing, and use common sense. Do not use the tool while tired or under the influence of drugs, alcohol, or medication.
- Tool Use and Care: Do not force the power tool. Use the correct power tool for your application. Disconnect the plug from the power source and/or the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools.
Product Overview
The Milwaukee 2504-20 is a versatile 1/2" hammer drill designed for various drilling and fastening applications. It features a compact design and robust construction.

This image displays the Milwaukee 2504-20 1/2 inch Hammer Drill from a side perspective. The tool features a red main housing with a black textured grip for ergonomic handling. The front includes a metallic chuck for securing drill bits. The 'Milwaukee FUEL' branding is visible on the side, indicating its power system.
Key Components:
- Chuck: Holds drill bits and other accessories.
- Clutch/Mode Selector: Adjusts torque settings for driving screws or selects drill/hammer drill mode.
- Speed Selector: Controls the maximum rotational speed.
- Trigger Switch: Activates the tool and controls variable speed.
- Forward/Reverse Selector: Changes the direction of rotation.
- Handle: Ergonomic grip for user comfort and control.
- Battery Port: For inserting the battery pack (battery sold separately for bare tool).
Setup
1. Battery Installation
- Ensure the tool is switched off.
- Align the battery pack with the battery port on the tool.
- Slide the battery pack into the port until it clicks securely into place.
- To remove, press the release button on the battery pack and slide it out.
2. Installing/Removing Drill Bits
- Ensure the tool is switched off and the battery is removed.
- Rotate the chuck counter-clockwise to open the jaws.
- Insert the drill bit into the chuck jaws, ensuring it is centered.
- Rotate the chuck clockwise to tighten the jaws firmly around the drill bit. Hand-tighten only; do not use a wrench.
- To remove, rotate the chuck counter-clockwise to loosen the jaws and pull the bit out.
Operating Instructions
1. Selecting Operating Mode
The tool features a mode selector ring located behind the chuck. Rotate this ring to select the desired mode:
- Drill Mode (Drill Icon): For drilling into wood, metal, and plastic.
- Hammer Drill Mode (Hammer Icon): For drilling into masonry and concrete.
- Driving Mode (Screw Icon with numbers): For driving screws. Adjust the numbered clutch setting to control torque and prevent over-driving or stripping screws.
2. Adjusting Speed and Direction
- Variable Speed Trigger: The trigger switch controls the speed. Pressing the trigger further increases the speed.
- Forward/Reverse Selector: Push the selector lever to the left for forward rotation (drilling/driving) and to the right for reverse rotation (removing screws/bits). Position the lever in the center to lock the trigger and prevent accidental startup.
3. Drilling Techniques
- Always secure your workpiece.
- Start drilling at a low speed to prevent the bit from wandering.
- Apply steady, even pressure. Do not force the drill.
- For hammer drilling, apply firm pressure and allow the hammer action to do the work.
- Periodically withdraw the bit from deep holes to clear debris.
Maintenance
1. Cleaning
- Always disconnect the battery pack before cleaning.
- Use a soft, damp cloth to wipe down the exterior of the tool. Do not use harsh chemicals or abrasive cleaners.
- Keep the ventilation openings clear of dust and debris. Use compressed air if necessary.
2. Storage
- Store the tool and battery pack in a cool, dry place, away from direct sunlight and moisture.
- Keep out of reach of children.
- Remove the battery pack from the tool before long-term storage.
3. Battery Care
- Charge battery packs only with the specified charger.
- Do not store battery packs in temperatures above 120°F (50°C) or below 0°F (-18°C).
- Do not short-circuit a battery pack.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start | Battery not charged or improperly installed; Forward/Reverse selector in center (locked) position. | Charge battery and ensure it is fully seated; Move selector to forward or reverse position. |
| Reduced power/performance | Low battery charge; Incorrect mode/clutch setting. | Recharge battery; Adjust mode/clutch setting appropriately for the task. |
| Chuck not holding bit securely | Chuck not tightened sufficiently; Damaged chuck jaws. | Ensure chuck is hand-tightened firmly; Inspect chuck for damage and replace if necessary. |
Specifications
- Model: 2504-20
- Drill Type: Hammer Drill
- Chuck Size: 1/2 inch
- Power Source: Battery Powered
- Voltage: 12 Volts
- Amperage: 8 Amps
- Maximum Rotational Speed: 2800 RPM
- Maximum Power: 850 Watts
- Item Weight: 2.3 Pounds
- Special Feature: Variable Speed
- Drilling Capacity Wood: 0.5 Inches
- Drilling Capacity Metal: 0.5 Inches
- Battery Cell Type: Lithium Ion
Warranty and Support
For warranty information and customer support, please refer to the documentation included with your purchase or visit the official Milwaukee website. Keep your proof of purchase for warranty claims.
For further assistance, contact Milwaukee customer service through their official channels.





