1. Introduction
Thank you for choosing the DEKO Professional 5-inch Angle Grinder, Model DKAG125G120S. This powerful and versatile tool is designed for demanding cutting and grinding applications on various materials such as metal, concrete, and stone. Featuring a 1200W motor and variable speed control from 3000 to 12000 RPM, it offers precision and efficiency for both professional and advanced users. Please read this manual carefully before operating the tool to ensure safe and optimal performance.
Figure 1: Overview of the DEKO Professional 5-inch Angle Grinder.
2. General Safety Instructions
Always follow basic safety precautions to reduce the risk of fire, electric shock, and personal injury. Keep this manual for future reference.
- Work Area Safety: Keep the 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.
- Electrical Safety: Power tool plugs must match the outlet. Never modify the plug. Avoid body contact with earthed or grounded surfaces. Do not expose power tools to rain or wet conditions.
- Personal Safety: Always wear eye protection (safety glasses or goggles) and hearing protection. Use a dust mask if operations create dust. Wear appropriate work gloves. Dress properly; avoid loose clothing or jewelry.
- 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 before making any adjustments, changing accessories, or storing power tools.
- Kickback and Related Warnings: Kickback is a sudden reaction to a pinched or snagged rotating wheel. Always maintain a firm grip on the tool and position your body and arm to allow you to resist kickback forces.
3. Setup
3.1 Unpacking
Carefully remove the angle grinder and all accessories from the packaging. Inspect for any damage that may have occurred during shipping. Ensure all components listed in the package contents are present.
3.2 Attaching the Auxiliary Handle
The auxiliary handle can be screwed into one of the three threaded holes on the gear housing, depending on the application and your working preference. Always operate the angle grinder with the auxiliary handle securely attached for better control and safety.
Figure 2: Auxiliary handle properly installed on the angle grinder.
3.3 Installing/Changing Grinding Disc
- Ensure the tool is unplugged from the power source.
- Press and hold the spindle lock button.
- Place the inner flange onto the spindle.
- Position the grinding or cutting disc onto the inner flange, ensuring it is centered.
- Screw the outer flange (nut) onto the spindle.
- Use the provided spanner wrench to tighten the outer flange securely. Release the spindle lock.
Figure 3: Using the spanner wrench to secure the grinding disc.
3.4 Connecting to Power
Ensure the angle grinder's voltage (220V) matches your power supply. Plug the tool into a grounded electrical outlet. Always check the power cord for damage before each use.
4. Operating Instructions
4.1 Starting and Stopping the Tool
To start the angle grinder, slide the ON/OFF switch forward. To stop, slide the switch backward to the OFF position. For continuous operation, some models may have a lock-on button; refer to the specific switch mechanism on your tool.
Figure 4: Location of the power switch for starting and stopping the tool.
4.2 Adjusting Speed
This model features variable speed control, allowing adjustment between 3000 and 12000 RPM. Use lower speeds for more delicate tasks or when working with heat-sensitive materials, and higher speeds for aggressive cutting and grinding. Adjust the speed using the dial or switch located on the tool body.
4.3 Proper Use for Cutting and Grinding
Always allow the disc to reach full operating speed before contacting the workpiece. Apply moderate, consistent pressure. Avoid excessive force, which can cause kickback or damage the disc and tool. Maintain a firm grip with both hands on the main handle and the auxiliary handle.
Figure 5: Demonstrating proper technique for cutting metal with the angle grinder.
Figure 6: Demonstrating grinding with a flap disc on the angle grinder.
5. Maintenance
Regular maintenance ensures the longevity and safe operation of your angle grinder. Always unplug the tool before performing any maintenance.
5.1 Cleaning
Keep the ventilation openings clean and free from obstructions to prevent overheating. Use a soft brush or compressed air to remove dust and debris from the tool housing. Do not use water or chemical cleaners.
5.2 Inspecting Components
Regularly inspect the power cord for cuts, fraying, or damage. Check the auxiliary handle and disc guard for secure attachment and any signs of damage. Replace worn or damaged discs immediately.
5.3 Carbon Brush Replacement
The carbon brushes are wear parts and should be checked periodically. When they are worn down, the motor performance may decrease, or the tool may stop working. Replace both carbon brushes simultaneously with genuine DEKO replacement parts. Consult a qualified service technician if you are unsure how to perform this task.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start | No power supply; Damaged power cord; Worn carbon brushes; Faulty switch | Check power outlet and cord; Replace power cord; Replace carbon brushes; Contact service center |
| Excessive vibration | Damaged or unbalanced disc; Loose flanges; Bent spindle | Replace disc; Tighten flanges; Contact service center |
| Overheating | Blocked ventilation slots; Overloading the tool | Clean ventilation slots; Reduce load and allow tool to cool |
| Reduced power/speed | Worn carbon brushes; Motor issue | Replace carbon brushes; Contact service center |
7. Specifications
| Feature | Specification |
|---|---|
| Model Number | DKAG125G120S |
| Voltage | 220V |
| Frequency | 60Hz |
| Power | 1200W |
| No-Load Speed | 3000-12000 RPM (Variable) |
| Max Disc Diameter | 125mm (5 inches) |
| Spindle Thread | M14 |
| Material | Metal |
| Dimensions (L x W x H) | 41 x 13 x 11 cm |
| Included Components | Auxiliary Handle, 125mm Disc Guard, Adjustment Wrench |
8. Warranty and Support
The DEKO Professional 5-inch Angle Grinder (Model DKAG125G120S) comes with a 1-year warranty from the date of purchase, covering manufacturing defects. This warranty does not cover damage caused by misuse, abuse, normal wear and tear, or unauthorized repairs.
For warranty claims, technical support, or spare parts, please contact your authorized DEKO dealer or customer service. Keep your proof of purchase for warranty validation.