Bosch Professional GWS 900-125 P Angle Grinder

Introduction

This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your Bosch Professional GWS 900-125 P Corded Angle Grinder. Please read these instructions carefully before using the tool and keep them for future reference.

The GWS 900-125 P is designed for cutting, roughing, and brushing metal and stone materials without the use of water. It features a highly efficient 900 W motor, a PROtection paddle switch for enhanced user safety, and an ergonomic design for improved handling.

Important Safety Instructions

Always observe the safety warnings, instructions, illustrations, and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious injury.

General Power Tool Safety Warnings

• Work Area Safety: Keep 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. Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
• Personal Safety: Stay alert, watch what you are doing and use common sense when operating a power tool. Always wear appropriate personal protective equipment (PPE) including safety glasses, hearing protection, dust mask, and gloves.
• 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 and/or remove the battery pack, if detachable, from the power tool before making any adjustments, changing accessories, or storing power tools.

Angle Grinder Specific Safety Warnings

• Guarding: Always use the correct guard for the specific application. Ensure the guard is securely attached and positioned for maximum safety.
• Accessories: Only use accessories that are specifically designed and recommended by Bosch Professional for this angle grinder. Ensure the accessory's RPM rating is equal to or greater than the tool's maximum RPM.
• Kickback: Be aware of kickback, which 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.
• Starting the Tool: Ensure the accessory is clear of the workpiece before starting the tool.
• Dust Extraction: When grinding metal, sparks are produced. Ensure no flammable materials are nearby. When grinding stone, wear a dust mask and use dust extraction if available.

Product Overview

Familiarize yourself with the components of your Bosch Professional GWS 900-125 P Angle Grinder.

Image: The Bosch Professional GWS 900-125 P Angle Grinder. This image displays the blue and grey body of the angle grinder, featuring the PROtection paddle switch on top, the auxiliary handle attached to the side, and a grinding disc with its protective guard. The Bosch Professional logo is visible on the tool body and the auxiliary handle.

Key Components

1. PROtection Paddle Switch: Located on the top of the tool, this switch must be continuously held for operation and instantly cuts power when released, enhancing safety.
2. Spindle Lock Button: Used to lock the spindle for easy accessory changes.
3. Auxiliary Handle: Provides additional grip and control during operation. Can be mounted on either side of the gear head.
4. Protective Guard: Essential for user safety, protecting against sparks and debris. Must always be used.
5. Grinding/Cutting Disc: The consumable accessory used for material removal or cutting.
6. Power Cord: For connecting the tool to a suitable power supply.

Setup and Assembly

Attaching the Protective Guard

The protective guard must always be used for grinding and cutting operations. Ensure it is securely fastened and positioned to protect the user.

• Place the protective guard onto the collar of the gear head.
• Rotate the guard to the desired position, ensuring it covers the maximum possible area between the user and the disc.
• Tighten the clamping screw on the guard firmly to secure it in place.

Mounting the Auxiliary Handle

The auxiliary handle provides better control and safety. It can be screwed into either the left or right side of the gear head, depending on user preference and application.

• Screw the auxiliary handle clockwise into one of the threaded holes on the gear head until it is firmly tightened.

Installing/Changing Grinding/Cutting Discs

Always disconnect the tool from the power supply before changing accessories.

1. Press and hold the spindle lock button to prevent the spindle from rotating.
2. Use the supplied spanner wrench to loosen and remove the clamping nut.
3. Remove the old grinding/cutting disc and the clamping flange.
4. Clean the mounting surfaces.
5. Place the new grinding/cutting disc onto the support flange, ensuring it is centered.
6. Place the clamping nut onto the disc and tighten it firmly with the spanner wrench while holding the spindle lock button.
7. Release the spindle lock button.

Operating Instructions

Switching On/Off

• To Switch On: Connect the tool to a suitable power supply. Press and hold the PROtection paddle switch. The tool will start.
• To Switch Off: Release the PROtection paddle switch. The tool will stop immediately.

Proper Handling and Grip

• Always hold the angle grinder firmly with both hands, one on the main handle and one on the auxiliary handle.
• Maintain a balanced stance and be prepared for sudden reactions (kickback).
• Ensure the power cord is positioned so it does not interfere with the work or get caught on the workpiece.

Working with the Angle Grinder

Always allow the disc to reach full speed before beginning work. Apply moderate pressure; excessive pressure will not speed up the work and can damage the disc or tool.

• Grinding: Hold the tool at an angle of approximately 15-30 degrees to the workpiece. Move the tool back and forth with moderate pressure.
• Cutting: For cutting, use a cutting disc and hold the tool at a 90-degree angle to the workpiece. Apply even, moderate pressure. Do not apply side pressure to the cutting disc.
• Material Compatibility: Use appropriate discs for the material being worked on (e.g., metal, stone).

Maintenance and Care

Regular maintenance ensures the longevity and safe operation of your angle grinder. Always disconnect the tool from the power supply before performing any maintenance.

• Cleaning: Keep the ventilation openings clean to prevent motor overheating. Regularly clean the tool housing with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
• Accessory Inspection: Before each use, inspect grinding/cutting discs for cracks, chips, or damage. Replace damaged discs immediately.
• Power Cord: Regularly inspect the power cord for damage. If damaged, have it repaired by a qualified service technician.
• Storage: Store the angle grinder in a dry, secure place out of reach of children and away from direct sunlight or extreme temperatures.
• Carbon Brushes: The motor is equipped with carbon brushes. If the tool shows reduced power or stops working, the carbon brushes may need replacement. This should be done by an authorized Bosch service center.

Troubleshooting

This section addresses common issues you might encounter with your angle grinder.

Technical Specifications

The following table provides the key technical specifications for the Bosch Professional GWS 900-125 P Angle Grinder.

Warranty and Customer Support

Bosch Professional products are manufactured to the highest quality standards and come with a manufacturer's warranty. Please refer to the warranty card included with your product for specific terms and conditions, including the warranty period and coverage.

For technical assistance, service, or spare parts, please contact Bosch Professional customer support:

• Customer Care Number: 18004258665 (India)
• Manufacturer Address: Bosch Limited, Bosch Ltd., Post Box No: 3000, Hosur Road, Adugodi, Bangalore - 560030, India
• You can also visit the official Bosch Professional website for more information and service center locations.