1. Safety Instructions
Always observe the following basic safety precautions to reduce the risk of fire, electric shock, and serious personal injury.
- Wear appropriate personal protective equipment (PPE) such as safety glasses, hearing protection, gloves, and a dust mask.
- Ensure the workpiece is securely clamped or held before starting the grinder.
- Keep hands clear of the rotating disc.
- Do not operate the tool in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust.
- Keep children and bystanders away while operating a power tool.
- Always disconnect the battery pack before making any adjustments, changing accessories, or storing the tool.
- Use only accessories that are specifically designed for this angle grinder and rated for its speed.
- Inspect the disc guard and side handle for damage before each use.
2. Product Overview
The Makita DGA504 is an 18V rechargeable brushless lithium-ion angle grinder designed for cutting, grinding, and polishing various materials including metal, stone, PVC, and wood. Its brushless motor provides efficient performance and extended tool life.
Figure 2.1: Makita DGA504 Angle Grinder (bare tool) and included accessories.
Components:
- Main Unit (Angle Grinder)
- Side Handle
- Disc Guard
- Inner Flange
- Outer Flange
- Lock Nut Wrench
- Battery Compartment (Battery not included with bare tool)
3. Setup and Assembly
3.1 Battery Installation
The DGA504 operates with an 18V lithium-ion battery (not included with bare tool). Ensure the battery is fully charged before use.
- Align the battery pack with the battery slot on the tool.
- Slide the battery pack into the slot until it clicks into place. Ensure it is securely latched.
- To remove, press the release button on the battery pack and slide it out.
Figure 3.1: Battery compartment detail.
3.2 Side Handle Attachment
The side handle can be attached to either side of the gear housing for optimal control and comfort, depending on the application and user preference.
- Screw the side handle clockwise into one of the threaded holes on the gear housing until it is firmly secured.
Figure 3.2: Angle grinder with side handle.
3.3 Disc Guard Adjustment
The disc guard protects against sparks and debris. Ensure it is correctly positioned for the task.
- Loosen the screw or lever on the disc guard.
- Rotate the guard to the desired position to deflect sparks away from you.
- Tighten the screw or lever firmly to secure the guard.
Figure 3.3: Disc guard and side handle assembly.
3.4 Grinding/Cutting Disc Installation
Always use the correct type and size of disc for your application. Refer to the disc manufacturer's instructions for proper use.
- Ensure the battery is removed.
- Press the spindle lock button to prevent the spindle from rotating.
- Place the inner flange onto the spindle.
- Place the grinding/cutting disc onto the inner flange, ensuring it is centered.
- Thread the outer flange onto the spindle and tighten it firmly using the lock nut wrench.
- Release the spindle lock button.
4. Operating Instructions
4.1 Powering On/Off
The DGA504 features a mid-mounted two-stage safety switch for safe operation.
- To start the tool, slide the safety switch forward and then press the power trigger.
- To stop the tool, release the power trigger. The safety switch will automatically return to the locked position.
Figure 4.1: Mid-mounted two-stage safety switch.
4.2 Applications
This angle grinder is suitable for a variety of tasks:
- Cutting: Use appropriate cutting discs for metal, stone, PVC, or wood.
- Grinding: Use grinding discs for smoothing welds, removing rust, or shaping metal.
- Polishing: With suitable attachments, the tool can be used for polishing surfaces.
Figure 4.2: Multi-functionality for wood and aluminum cutting.
Figure 4.3: Angle grinder in industrial use.
4.3 Heat Dissipation
The DGA504 features a multidimensional stereoscopic heat dissipation system to prevent overheating during prolonged use, ensuring consistent performance and tool longevity.
Figure 4.4: Heat dissipation system diagram.
5. Maintenance
Regular maintenance ensures optimal performance and extends the life of your tool. Always remove the battery pack before performing any maintenance.
5.1 Cleaning
- Clean the tool's ventilation openings regularly to prevent dust buildup, which can lead to overheating.
- Wipe the tool body with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
- Remove any debris or dust from the disc guard and spindle area.
5.2 Disc Guard Inspection
The disc guard is made of thickened metal material for durability. Regularly inspect it for any signs of damage, cracks, or deformation. Replace if necessary to ensure user safety.
Figure 5.1: Metal protective cover detail.
5.3 Battery Care
- Store batteries in a cool, dry place away from direct sunlight and heat.
- Do not store fully discharged batteries for extended periods.
- Use only Makita-approved chargers for your 18V lithium-ion batteries.
5.4 Brushless Motor
The brushless motor requires less maintenance compared to brushed motors as there are no carbon brushes to replace. However, ensure the tool is kept clean and free from excessive dust and debris to maintain optimal performance.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start | Battery not inserted correctly or discharged; Safety switch not engaged. | Ensure battery is fully charged and properly inserted. Engage the two-stage safety switch correctly. |
| Reduced power or performance | Low battery charge; Incorrect disc for material; Overload protection activated. | Recharge battery. Use the correct disc. Reduce pressure on the tool. Allow tool to cool if overheated. |
| Excessive vibration | Disc improperly installed or damaged; Loose side handle. | Check disc installation and replace if damaged. Tighten side handle. |
| Tool overheats | Blocked ventilation slots; Prolonged heavy use. | Clean ventilation slots. Allow tool to cool down. Avoid continuous heavy load. |
7. Specifications
| Feature | Specification |
|---|---|
| Brand Name | Makita |
| Model Number | DGA504 |
| Voltage | 18V |
| Battery Capacity (Recommended) | 6.0Ah Lithium-Ion |
| Disc Diameter | 125mm |
| Motor Type | Brushless |
| Origin | Mainland China |
| Intended Use | Renovation Team |
| Certification | CE, KC |
| Package Length | 40 cm |
| Package Width | 18 cm |
| Package Height | 10 cm |
| Package Weight | 1.973 kg |
8. User Tips
- Always wear PPE: Safety glasses, hearing protection, and gloves are crucial for preventing injuries.
- Secure your workpiece: Use clamps or a vise to hold the material firmly. This prevents kickback and ensures cleaner cuts/grinds.
- Choose the right disc: Match the disc type (cutting, grinding, flap disc) and material (metal, masonry, wood) to your application for best results and safety.
- Let the tool do the work: Avoid forcing the grinder. Apply steady, moderate pressure and let the disc's speed and abrasive nature do the cutting or grinding.
- Maintain a firm grip: Always use the side handle for better control and to reduce fatigue.
- Check for obstructions: Before starting, ensure there are no hidden wires, pipes, or other obstructions in the workpiece.
9. Warranty and Support
For warranty information, please refer to the documentation provided with your purchase or contact your authorized Makita dealer. Keep your proof of purchase for any warranty claims.
For technical support, service, or replacement parts, please contact Makita customer service or an authorized service center. Ensure you have your model number (DGA504) and serial number (if applicable) ready when contacting support.
This product is certified with CE and KC standards, indicating compliance with relevant health, safety, and environmental protection requirements.
