Chicago Pneumatic CP857 Air Angle Grinder Instruction Manual

1. Product Overview

The Chicago Pneumatic CP857 is a heavy-duty 7-inch (180mm) air angle grinder designed for general maintenance applications. This tool offers efficient metal removal capabilities and high durability, making it suitable for various industrial tasks.

Its robust construction and ergonomic design contribute to comfortable and reliable performance in demanding environments.

2. Safety Information

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

Always adhere to general safety guidelines when operating pneumatic tools. Failure to do so may result in serious injury or property damage.

• Eye Protection: Always wear ANSI-approved safety goggles or a face shield.
• Hearing Protection: Use earplugs or earmuffs to protect against noise levels.
• Hand Protection: Wear appropriate gloves to protect hands from sparks and debris.
• Respiratory Protection: Use a respirator in dusty environments.
• Work Area: Ensure the work area is clean, well-lit, and free of obstructions. Keep bystanders away.
• Tool Condition: Inspect the tool, air hose, and grinding wheel for damage before each use. Do not operate damaged equipment.
• Air Supply: Ensure the air supply is clean, dry, and at the correct pressure.
• Proper Guard: Always use the wheel guard provided with the tool.

3. Product Features

• Powerful and Efficient: Equipped with a 1.26 HP (940 W) motor, providing high efficiency and rapid metal removal.
• High Speed: Achieves a free speed of 7,500 RPM.
• Wheel Capacity: Supports a maximum wheel capacity of 7 inches (180 mm).
• Ergonomic Design: Features an aluminum alloy housing for a rugged yet lightweight construction.
• Durability: Helical bevel gearing in the angle head ensures extended tool life and smooth, low-vibration operation.
• Versatile Applications: Suitable for cleaning, deburring, blending, and smoothing tasks.

4. Setup Instructions

4.1 Air Supply Connection

1. Ensure your air compressor can provide the required air pressure and volume (6 CFM average air consumption, 24 CFM free speed air consumption).
2. Connect a 3/8-inch minimum diameter air hose to the tool's 3/8-inch NPTF air inlet.
3. Install an in-line air filter/lubricator as close to the tool as possible to ensure clean, lubricated air.
4. Set the air pressure at the regulator to the recommended operating pressure, typically around 90 PSI (6.2 bar), or as specified for your grinding wheel.

4.2 Grinding Wheel Installation

1. Disconnect the tool from the air supply before installing or changing any accessories.
2. Ensure the grinding wheel is rated for at least 7,500 RPM and is compatible with a 7-inch diameter and 5/8-11 spindle thread.
3. Position the wheel guard correctly to deflect sparks and debris away from the operator.
4. Mount the grinding wheel onto the spindle, ensuring it is seated properly. Use the provided wrench to securely tighten the retaining nut. Do not overtighten.
5. Verify that the wheel rotates freely and is not obstructed by the guard or other components.

5. Operating Instructions

5.1 General Operation

1. Ensure all safety precautions are in place (PPE, clear work area).
2. Connect the tool to the air supply.
3. Hold the grinder firmly with both hands, utilizing the removable side handle for increased maneuverability and control.
4. Start the grinder before making contact with the workpiece.
5. Apply light, even pressure to the workpiece. Allow the tool's speed and the abrasive action of the wheel to do the work. Avoid excessive force, which can damage the wheel or tool.
6. Move the grinder smoothly across the surface to achieve an even finish.
7. For tasks such as weld preparation, rust removal, deburring, and blending of steel, cast iron, and aluminum, use appropriate grinding wheels.
8. When finished, lift the grinder from the workpiece before releasing the trigger.
9. Disconnect the air supply after use.

6. Maintenance

Regular maintenance ensures optimal performance and extends the lifespan of your CP857 air angle grinder.

• Lubrication: If an in-line lubricator is not used, add a few drops of pneumatic tool oil into the air inlet before and after each use.
• Cleaning: Keep the tool clean and free of debris. Periodically blow out the air inlet and exhaust ports with compressed air.
• Inspection: Regularly inspect the grinding wheel for wear, cracks, or damage. Replace worn or damaged wheels immediately. Check the wheel guard for proper positioning and integrity.
• Air Hose: Inspect the air hose for cuts, kinks, or leaks. Replace damaged hoses.
• Fasteners: Ensure all screws and fasteners are tight.

7. Troubleshooting

7.1 Common Issues

• Loss of Power or Slow Speed:
  • Check air pressure at the tool. Ensure it is at the recommended 90 PSI.
  • Inspect air hose for kinks, leaks, or insufficient diameter.
  • Verify the air compressor can deliver adequate CFM.
  • Check for blockages in the air inlet or exhaust.
  • Ensure proper lubrication.
• Excessive Vibration:
  • Inspect the grinding wheel for damage, imbalance, or improper installation. Replace if necessary.
  • Check for loose components on the tool.
• Air Leaks:
  • Tighten all air connections.
  • Inspect the air hose for damage.

If problems persist after attempting these troubleshooting steps, contact Chicago Pneumatic customer support or an authorized service center.

8. Specifications

9. Warranty Information

The Chicago Pneumatic CP857 Air Angle Grinder comes with a 2-year limited warranty. This warranty covers defects in materials and workmanship under normal use. For specific terms, conditions, and claim procedures, please refer to the official warranty documentation included with your product or contact Chicago Pneumatic customer service.

10. Customer Support

For technical assistance, spare parts, or service inquiries regarding your Chicago Pneumatic CP857 Air Angle Grinder, please contact Chicago Pneumatic customer support. You can find contact information on the official Chicago Pneumatic website or through your authorized dealer.

Online Resources: Visit the official Chicago Pneumatic website for product manuals, FAQs, and service center locations.