Makita 9557NB 4-1/2" Angle Grinder Instruction Manual

1. Product Overview

The Makita 9557NB is a powerful 4-1/2" angle grinder designed for various cutting and grinding applications. It features a robust motor and durable construction for extended tool life and consistent performance.

Key Features:

• Powerful 7.5 AMP motor delivers 11,000 RPM for high output power.
• Compact design with small 2-1/2" diameter barrel and weighs only 4.5 lbs. for added comfort.
• Protective zig-zag varnish seals the armature from dust and debris for longer tool life.
• Labyrinth construction seals and protects the drive gear and bearings from contamination for longer tool life.
• AC/DC switch for use with alternative power source.

This angle grinder is suitable for both professional and home use, offering reliability and power for demanding tasks.

2. Safety Instructions

Always prioritize safety when operating power tools. Read and understand all safety warnings and instructions provided with the product before use. Failure to follow the warnings and instructions may result in electric shock, fire, and/or serious injury.

General Safety Precautions:

• Wear appropriate personal protective equipment (PPE): This includes safety glasses, hearing protection, gloves, and a dust mask.
• Secure the workpiece: Always clamp or otherwise secure the material you are working on to prevent movement during operation.
• Maintain a firm grip: Hold the grinder firmly with both hands during operation.
• Keep work area clean: Cluttered areas invite accidents.
• Avoid accidental starting: Ensure the switch is in the off-position before plugging in the tool.
• Use correct accessories: Only use accessories that are specifically designed for your angle grinder and rated for its speed.
• Inspect tool before use: Check for damaged parts, proper alignment, and any other condition that may affect its operation.

3. Setup

Attaching the Side Handle:

The side handle can be installed on either side of the tool for optimal control and comfort, depending on your working position and handedness. Screw the side handle firmly into one of the threaded holes on the gear housing.

Installing the Wheel Guard:

The wheel guard is essential for safety, protecting against sparks and debris. Position the wheel guard over the spindle and secure it according to the instructions provided in the full manual. Ensure it is tightly fastened and correctly oriented to deflect debris away from you.

Changing Grinding/Cutting Discs:

1. Unplug the tool: Always disconnect the grinder from the power source before changing accessories.
2. Press the spindle lock: Locate and press the spindle lock button to prevent the spindle from rotating.
3. Loosen the lock nut: Use the provided lock nut wrench to loosen and remove the lock nut.
4. Remove the old disc: Carefully remove the used grinding or cutting disc.
5. Install the new disc: Place the new disc onto the inner flange, ensuring it is centered.
6. Secure the lock nut: Re-attach the lock nut and tighten it firmly with the wrench while holding the spindle lock. Do not overtighten.

4. Operating Instructions

Powering On/Off:

The Makita 9557NB features an AC/DC switch conveniently located on the top of the motor housing. To turn the grinder on, slide the switch to the "ON" position. To turn it off, slide the switch to the "OFF" position. Ensure the switch is in the "OFF" position before connecting or disconnecting the power cord.

Grinding and Cutting Techniques:

• Start slowly: Allow the disc to reach full speed before making contact with the workpiece.
• Maintain consistent pressure: Apply steady, even pressure. Do not force the tool, as this can lead to kickback or damage.
• Angle for grinding: For grinding, hold the disc at a 15-30 degree angle to the workpiece.
• Angle for cutting: For cutting, hold the disc perpendicular (90 degrees) to the workpiece.
• Work in sections: For larger areas, work in smaller, manageable sections to prevent overheating of the tool or workpiece.

5. Maintenance

Regular maintenance ensures the longevity and safe operation of your Makita 9557NB Angle Grinder.

• Cleaning: Regularly clean the tool's ventilation openings to prevent dust buildup, which can cause overheating. Use a soft brush or compressed air.
• Carbon Brushes: Periodically inspect the carbon brushes. Worn brushes can lead to reduced performance or motor damage. Replace them when they are worn down to the limit mark.
• Power Cord: Inspect the power cord for any damage, cuts, or fraying. Replace damaged cords immediately to prevent electrical hazards.
• Gear Housing: The labyrinth construction seals and protects the drive gear and bearings from contamination. While designed for durability, avoid excessive exposure to dust and debris.
• Storage: Store the grinder in a dry, secure place out of reach of children and away from direct sunlight or extreme temperatures.

6. Troubleshooting

If you encounter issues with your Makita 9557NB, refer to the following common troubleshooting steps:

For issues not covered here or if problems persist, contact Makita authorized service centers.

7. Specifications

8. Warranty and Support

The Makita 9557NB Angle Grinder comes with a 1 Year Parts & Labor warranty. For warranty claims, service, or technical support, please refer to the official Makita website or contact an authorized Makita service center. Keep your purchase receipt as proof of purchase for warranty validation.