Introduction
This instruction manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your Bosch GWS8-45-RT 120V 7.5 Amp 4-1/2 inch Corded Angle Grinder. Please read this manual thoroughly before using the tool and retain it for future reference. Adherence to these instructions will help ensure optimal performance and extend the lifespan of your tool.
Image: The Bosch GWS8-45-RT 4-1/2 inch Corded Angle Grinder, shown with its side handle and grinding disc attached.
Safety Information
Always prioritize safety when operating power tools. Failure to follow safety instructions can result in electric shock, fire, and/or serious injury. Keep all warnings and instructions for future reference.
General Power Tool Safety Warnings
- Work Area Safety: Keep the work area clean and well-lit. Cluttered or dark areas invite accidents. 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 in any way. Avoid body contact with earthed or grounded surfaces. Do not expose power tools to rain or wet conditions.
- Personal Safety: Always wear eye protection. Use hearing protection when operating for extended periods. Wear a dust mask if operations create dust. 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.
Angle Grinder Specific Safety Warnings
- Always use the correct type of grinding or cutting disc for the material and application.
- Ensure the disc is securely mounted and free from damage before each use.
- Never operate the grinder without the guard properly installed and adjusted.
- Be aware of sparks and flying debris. Keep bystanders at a safe distance.
- Hold the tool firmly with both hands during operation.
Setup
1. Unpacking and Inspection
Carefully remove the angle grinder and all accessories from the packaging. Inspect the tool for any signs of damage that may have occurred during shipping. Do not operate a damaged tool.
2. Attaching the Side Handle
The Bosch GWS8-45-RT features a two-position side handle for enhanced control. Screw the side handle firmly into either the left or right side of the gear housing, depending on your preference and the application. Ensure it is tightened securely before use.
Image: Close-up view of the Bosch GWS8-45-RT angle grinder showing the attachment point for the side handle and the grinding disc.
3. Installing/Changing Grinding Discs
- Ensure the tool is unplugged from the power source.
- Press and hold the spindle lock button.
- Use the spanner wrench (if provided) to loosen and remove the clamping nut.
- Place the desired 4-1/2 inch grinding or cutting disc onto the flange, ensuring it sits flush.
- Replace the clamping nut and tighten it securely with the spanner wrench while holding the spindle lock button.
- Release the spindle lock button.
Image: A hand holding the Bosch GWS8-45-RT angle grinder, demonstrating the position of the grinding disc and the slim grip design.
4. Adjusting the Guard
The guard must always be positioned to provide maximum protection from sparks and debris, and to cover as much of the disc as possible. Adjust the guard by loosening its clamp, rotating it to the desired position, and then securely tightening the clamp.
Operating Instructions
1. Powering On/Off
- To turn on the grinder, slide the switch forward.
- To turn off, slide the switch backward to the OFF position.
- Always ensure the switch is in the OFF position before plugging or unplugging the tool.
2. Grinding Techniques
Hold the grinder firmly with both hands. Allow the disc to reach full speed before contacting the workpiece. Apply light, even pressure and move the grinder smoothly across the surface. Avoid excessive pressure, which can reduce efficiency and damage the disc or tool.
Image: The Bosch GWS8-45-RT angle grinder in active use, generating sparks while grinding a metal surface. Operator is wearing protective gloves.
3. Cutting Techniques
When cutting, use a thin cutting disc. Hold the grinder at a slight angle (approximately 15-30 degrees) to the workpiece. Make shallow passes rather than attempting to cut through thick material in one go. Ensure the workpiece is securely clamped.
Maintenance
Regular maintenance ensures the longevity and safe operation of your Bosch GWS8-45-RT angle grinder. Always unplug the tool before performing any maintenance.
1. Cleaning
- Regularly clean the ventilation openings to prevent overheating. The directed air flow system helps divert dust, but periodic cleaning is still recommended.
- Wipe down the tool housing with a soft, damp cloth. Do not use harsh chemicals or solvents.
Image: Close-up of the Bosch GWS8-45-RT angle grinder's body, highlighting the ventilation grilles and the Bosch logo.
2. Carbon Brush Inspection and Replacement
The durable carbon brushes are designed for extended tool life. If the tool experiences reduced power or intermittent operation, the carbon brushes may need inspection or replacement. This procedure typically requires opening the motor housing and should ideally be performed by a qualified service technician to ensure proper reassembly and safety.
3. Cord Inspection
Periodically inspect the power cord for any cuts, abrasions, or damage. A damaged cord can pose an electrical hazard and must be replaced immediately by a qualified professional.
Troubleshooting
This section addresses common issues you might encounter with your angle grinder.
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start | No power supply; Faulty switch; Worn carbon brushes | Check power outlet and cord; Ensure switch is fully engaged; Inspect/replace carbon brushes (professional service recommended) |
| Excessive vibration | Damaged or improperly mounted disc; Loose side handle | Inspect and replace disc if damaged, ensure proper mounting; Tighten side handle |
| Reduced power or intermittent operation | Worn carbon brushes; Overheating | Inspect/replace carbon brushes (professional service recommended); Allow tool to cool down, ensure vents are clear |
Specifications
| Feature | Detail |
|---|---|
| Brand | Bosch |
| Model | GWS8-45-RT |
| Voltage | 120 Volts |
| Wattage | 900 Watts |
| Amperage | 7.5 Amp |
| Disc Diameter | 4-1/2 inches |
| Maximum Rotational Speed | 10000 RPM |
| Power Source | Corded Electric |
| Material | Metal, Plastic |
| Item Weight | 5.05 pounds |
| Special Features | Durable carbon brushes, directed air flow, two-position side handle, slim-grip design |
Warranty and Support
This Bosch GWS8-45-RT angle grinder is a renewed product. Renewed products are typically backed by the Amazon Renewed Guarantee, which provides for a replacement or refund if you are not satisfied with your purchase. Please refer to the specific terms and conditions of the Amazon Renewed Guarantee for details regarding coverage and duration.
For product-specific technical support or service inquiries, please contact Bosch customer service. You can typically find their contact information on the official Bosch website or through the retailer where the product was purchased.
