Introduction
The Makita DGA513RTJ is a professional-grade 18V cordless angle grinder designed for various grinding and cutting applications. It features a brushless motor, soft start, and a variable speed control dial, delivering up to 8,500 RPM. This tool incorporates advanced technologies such as Automatic Torque Drive Technology (ATD) for optimal cutting speed under load, and Active Feedback Sensing Technology (AFT) which enhances user safety by shutting down the tool if rotation speed suddenly decreases. The DGA513RTJ also includes a lock-on function and removable dust covers for improved durability and performance.
Image: The Makita DGA513RTJ angle grinder being used to grind a metal pipe, demonstrating its operational capabilities and the sparks generated during use. The user is wearing protective gloves.
Safety Instructions
Always observe fundamental safety precautions when operating power tools to reduce the risk of injury. Read and understand all instructions before use.
- Personal Protective Equipment (PPE): Always wear safety glasses, hearing protection, and suitable gloves. A dust mask is recommended for dusty operations.
- Work Area: Ensure the work area is clean, well-lit, and free from obstructions. Keep bystanders and children away.
- Secure Workpiece: Always clamp or otherwise secure the workpiece to prevent movement during operation.
- Inspect Tool and Accessories: Before each use, check the grinding wheel for cracks or damage. Ensure the wheel guard is properly installed and adjusted.
- Proper Grip: Maintain a firm grip on the tool with both hands during operation.
- Avoid Overreaching: Maintain proper footing and balance at all times.
- Battery Safety: Use only Makita 18V Li-ion LXT slide type batteries and chargers. Do not expose batteries to water or extreme temperatures.
- Anti-restart Function: The tool is equipped with an anti-restart function. If the battery is inserted with the switch in the ON position, the tool will not start. Return the switch to OFF, then ON to operate.
- Electronic Current Limiter: This feature protects the motor from overload. If the tool is overloaded, it will automatically reduce power or shut down.
- Active Feedback Sensing Technology (AFT): If the rotation speed suddenly slows down (e.g., due to kickback), AFT will shut down the tool to protect the user.
Components
Familiarize yourself with the main components of your Makita DGA513RTJ angle grinder:
- Grinder Body: The main housing containing the motor and gears.
- Spindle Lock Button: Used to lock the spindle for wheel changes.
- Side Handle: Provides additional grip and control. Can be mounted on either side.
- Wheel Guard: Protects the user from sparks and debris. Adjustable.
- Grinding Wheel/Cutting Disc: The abrasive accessory for material removal or cutting. (125mm diameter compatible)
- Lock Nut Wrench: Used to tighten and loosen the lock nut for wheel changes.
- Battery Cartridge: 18V Li-ion LXT slide type battery (sold separately or included in RTJ kit).
- On/Off Slide Switch: Controls power to the tool.
- Variable Speed Control Dial: Adjusts the rotational speed of the grinding wheel.
- Battery Fuel Gauge: Indicates the remaining battery charge.
Image: The Makita DGA513RTJ angle grinder with its side handle attached, showcasing the tool's ergonomic design and key components like the battery slot and spindle.
Setup
1. Battery Installation and Removal
- To Install: Align the battery cartridge with the housing slot and slide it in until it locks into place with a slight click. Ensure the battery is fully seated.
- To Remove: Press the button on the front of the battery cartridge and slide the battery out of the tool.
2. Attaching the Side Handle
Screw the side handle firmly into one of the threaded holes on either side of the gear housing. Choose the side that provides the most comfortable and secure grip for your application.
3. Installing/Removing the Wheel Guard
- To Install: Loosen the screw on the wheel guard. Place the guard over the spindle housing so that the projections on the guard align with the grooves on the housing. Rotate the guard to the desired position and tighten the screw securely.
- To Remove: Loosen the screw and slide the guard off.
4. Attaching/Removing Grinding Wheels or Cutting Discs
Always ensure the battery is removed before changing accessories.
- To Attach:
- Place the inner flange onto the spindle.
- Place the grinding wheel or cutting disc onto the inner flange, ensuring it is centered.
- Screw the lock nut onto the spindle.
- Press the spindle lock button firmly to prevent the spindle from rotating.
- Use the lock nut wrench to tighten the lock nut securely.
- To Remove:
- Press the spindle lock button.
- Use the lock nut wrench to loosen and remove the lock nut.
- Remove the grinding wheel/cutting disc and inner flange.
Operating the Angle Grinder
1. Powering On and Off
- To Start: Slide the On/Off switch forward to the "I" (ON) position. The tool will start with a soft start feature, gradually increasing speed.
- To Stop: Slide the On/Off switch backward to the "O" (OFF) position.
- Lock-on Function: For continuous operation, slide the switch forward and then press the front part of the switch down to lock it in the ON position. To release, press the rear part of the switch.
2. Adjusting Speed
The variable speed control dial allows you to adjust the rotational speed from 3,000 to 8,500 RPM. Rotate the dial to select the appropriate speed for your material and application. Lower speeds are generally used for polishing or delicate work, while higher speeds are for aggressive grinding or cutting.
3. Grinding and Cutting Techniques
- Grinding: Hold the tool at a slight angle (15-30 degrees) to the workpiece. Apply moderate pressure and move the grinder smoothly across the surface.
- Cutting: Hold the tool perpendicular (90 degrees) to the workpiece. Allow the disc to cut through the material without forcing it. Avoid twisting or bending the disc.
- Automatic Torque Drive Technology (ATD): This feature automatically adjusts the cutting speed and torque according to the load condition, ensuring optimal performance and efficiency.
4. Battery Fuel Gauge
Press the check button on the battery cartridge to illuminate the LED indicators, showing the remaining battery capacity.
Maintenance
Regular maintenance ensures the longevity and safe operation of your angle grinder. Always remove the battery before performing any maintenance.
- Cleaning: Regularly clean the tool's ventilation openings to prevent dust buildup, which can cause overheating. Use a soft brush or compressed air. Clean the removable dust covers.
- Inspection: Periodically inspect the power cord (if using a corded charger), switch, and housing for damage. Check the grinding wheel for wear or cracks.
- Battery Care: Store batteries in a cool, dry place. Do not store fully discharged batteries for extended periods.
- Lubrication: This tool is designed for maintenance-free operation regarding internal lubrication. Do not attempt to lubricate internal components.
- Service: For any repairs or internal maintenance, contact an authorized Makita service center.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start. | Battery not charged or improperly inserted. Anti-restart function engaged. On/Off switch not fully engaged. | Ensure battery is charged and properly inserted. If anti-restart is engaged, return switch to OFF, then ON. Fully engage the On/Off switch. |
| Reduced power or stops during operation. | Overload protection (Electronic Current Limiter) activated. Battery charge low. | Reduce pressure on the tool. Allow the tool to cool down. Recharge or replace the battery. |
| Excessive vibration. | Grinding wheel damaged or improperly installed. Lock nut not tightened. | Inspect grinding wheel for damage and replace if necessary. Ensure wheel is properly seated and lock nut is securely tightened. |
| Tool shuts down unexpectedly. | Active Feedback Sensing Technology (AFT) activated due to sudden speed drop (kickback). Overload. | Check for binding or excessive pressure. Allow the tool to cool. Ensure proper grinding technique. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | DGA513RTJ |
| Voltage | 18 Volts |
| Power Source | Battery Powered (Li-ion LXT) |
| Maximum Rotational Speed | 8500 RPM |
| Wheel Diameter | 125 mm |
| Item Weight | 2.8 kg |
| Product Dimensions | Approximately 36.8L x 12.5W x 15.1H Centimetres |
| Material | Metal, Plastic |
| Included Components (RTJ Kit) | 1 x Fast charger, 1 x Grinding wheel, 1 x Lock nut wrench, 1 x Makita DGA513RTJ, 1 x Makpac case, 1 x Side handle, 2 x 5.0 Ah Li-ion batteries |
Warranty and Support
Warranty Information
The Makita DGA513RTJ comes with a 1-year manufacturer warranty. An additional 2 years of warranty can be obtained by registering the product within 30 days of purchase. This warranty is valid only when genuine or recommended parts and accessories are fitted to the tool. The use of non-genuine or incompatible batteries and chargers with Makita tools will invalidate the Makita guarantee for the tools.
Customer Support
For technical assistance, warranty claims, or to locate an authorized service center, please visit the official Makita website or contact Makita customer service. Keep your purchase receipt and product serial number readily available.
Official Makita Website: www.makita.ca
