1. Introduction
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your new BOSCH GKS 18V-51 Cordless Circular Saw. Please read this manual thoroughly before using the tool to ensure proper handling and to maximize its performance and lifespan. This professional-grade 18V circular saw is designed for precise and powerful woodworking tasks.
2. Safety Information
Always observe general power tool safety warnings and instructions. Failure to follow the warnings and instructions may 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 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: 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. Wear appropriate personal protective equipment (PPE) such as safety glasses, hearing protection, dust mask, and non-skid safety shoes.
- Power Tool Use and Care: Do not force the power tool. Use the correct power tool for your application. Disconnect the battery pack from the power tool before making any adjustments, changing accessories, or storing power tools.
- Circular Saw Specific Safety: Keep hands away from the cutting area and the blade. Do not reach underneath the workpiece. Ensure the blade guard is functioning correctly before each use.
3. Product Overview
The BOSCH GKS 18V-51 is a high-performance cordless circular saw designed for professional use. It combines power, precision, and user comfort for a wide range of cutting applications in wood.
Key Features:
- 18V Brushless Motor: Provides effortless and powerful cutting performance.
- Compact Design & Ergonomic Handle: Ensures easy handling and comfortable use, reducing fatigue during extended operation.
- Optimized Dust Extraction Port: Designed to keep the work area cleaner by efficiently removing dust.
- Soft Start and Brake Functions: Allows for smooth starting and quick stopping of the blade, enhancing safety and control.
- Dust Blower Function: Keeps the cutting line clear of debris, ensuring better visibility and more accurate cuts.
- LED Light: Illuminates the cutting area, making it easier to work in poorly lit conditions.
4. Setup
4.1 Battery Installation
- Ensure the saw is switched off and the blade is stationary.
- Align the battery pack with the battery port on the saw handle.
- 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.
4.2 Blade Installation and Removal
- Disconnect the battery pack before changing the blade.
- Press the spindle lock button to secure the blade.
- Use the provided wrench to loosen the blade bolt by turning it counter-clockwise.
- Remove the outer flange and the old blade.
- Clean the inner and outer flanges.
- Place the new blade onto the spindle, ensuring the rotation direction arrows on the blade match the arrow on the saw's guard.
- Reinstall the outer flange and blade bolt. Tighten the bolt clockwise while holding the spindle lock button.
4.3 Adjusting Cutting Depth
- Loosen the depth adjustment lever.
- Move the base plate up or down to the desired cutting depth, aligning with the scale.
- Tighten the depth adjustment lever securely.
4.4 Adjusting Bevel Angle
- Loosen the bevel adjustment knob.
- Tilt the base plate to the desired angle, aligning with the bevel scale.
- Tighten the bevel adjustment knob securely.
5. Operating Instructions
5.1 Basic Operation
- Ensure the workpiece is securely clamped and stable.
- Set the desired cutting depth and bevel angle.
- Hold the saw firmly with both hands.
- Press the trigger to start the saw. Allow the blade to reach full speed before beginning the cut (soft start function will manage this smoothly).
- Guide the saw along the cutting line with steady, even pressure. Do not force the saw.
- Once the cut is complete, release the trigger. The blade brake function will stop the blade quickly.
5.2 Dust Extraction
For a cleaner work environment and improved visibility, connect a suitable dust extraction system to the saw's dust port. The optimized design of the dust extraction port helps to efficiently remove sawdust.
5.3 LED Light and Dust Blower
The integrated LED light automatically illuminates the cutting line when the saw is in operation, providing clear visibility in various lighting conditions. The dust blower function directs air towards the cutting line, keeping it free from sawdust for precise cuts.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your circular saw.
- Cleaning: After each use, clean the saw thoroughly. Remove sawdust and debris from the motor vents, blade guard, and base plate. Use a soft brush or compressed air. Do not use solvents or abrasive cleaners.
- Blade Inspection: Regularly inspect the saw blade for sharpness, cracks, or missing teeth. Replace dull or damaged blades immediately.
- Guard Mechanism: Ensure the lower blade guard moves freely and retracts properly. Keep it clean and free of obstructions.
- Battery Care: Store battery packs in a cool, dry place away from direct sunlight. Do not store discharged battery packs.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Saw does not start | Battery not charged or improperly installed; Faulty switch | Charge battery, ensure proper installation; Contact service center if switch is faulty |
| Poor cut quality / Blade binding | Dull or incorrect blade; Incorrect cutting depth; Forcing the saw | Replace blade, ensure it's suitable for material; Adjust depth; Reduce feed pressure |
| Excessive vibration | Damaged blade; Loose blade bolt; Worn bearings | Replace blade; Tighten blade bolt; Contact service center for bearing replacement |
| Dust extraction ineffective | Dust port clogged; Dust bag/vacuum full or improperly connected | Clear dust port; Empty/connect dust bag/vacuum correctly |
8. Specifications
| Attribute | Value |
|---|---|
| Model Number | GKS 18V-51 |
| Brand Name | Bosch |
| Origin | Mainland China |
| Certification | CE, FCC |
| DIY Supplies | Electrical |
| Package Length | 41 cm |
| Package Width | 29 cm |
| Package Height | 20 cm |
| Package Weight | 3.232 kg |
9. User Tips
- Bare Tool: Please note that the BOSCH GKS 18V-51 is often sold as a 'bare tool', meaning the battery and charger are not included. Ensure you have compatible Bosch Professional 18V batteries and a charger for operation.
- Blade Selection: Always use the correct blade type for the material you are cutting (e.g., wood, plywood, MDF) to achieve the best results and prevent premature blade wear.
- Cleanliness: Regularly clear sawdust from the base plate and blade guard to maintain cutting accuracy and ensure the guard operates smoothly.
10. Warranty and Support
For warranty information, service, or technical support, please refer to the documentation provided with your purchase or contact your local Bosch Professional tools dealer. Keep your proof of purchase for any warranty claims.
