Hilti DX 351 Powder-Actuated Tool Instruction Manual

1. Introduction

This instruction manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of the Hilti DX 351 powder-actuated fastening tool. It is crucial to read and understand all instructions and safety warnings before using the tool. Keep this manual accessible for future reference.

2. Safety Instructions

Always adhere to general safety regulations and local accident prevention rules. Failure to follow these instructions may result in serious injury or property damage.

• Personal Protective Equipment (PPE): Always wear eye protection, hearing protection, and safety gloves when operating the tool.
• Authorized Personnel: Only trained and authorized personnel should operate this tool.
• Work Area: Ensure the work area is clear of bystanders and free from flammable materials.
• Tool Condition: Inspect the tool for any damage before each use. Do not use a damaged tool.
• Fastener and Cartridge Compatibility: Use only Hilti-approved fasteners and cartridges that are compatible with the DX 351.
• Never point the tool at yourself or others.
• Storage: Store the tool, fasteners, and cartridges securely and out of reach of unauthorized persons.

3. Components Overview

The Hilti DX 351 kit includes the following main components:

• DX 351 Basic Unit: The main body of the powder-actuated tool.
• X-P8S-351 Piston: An essential internal component for driving fasteners.
• Nail Magazine X-MX32 Assy: Attaches to the tool for sequential fastening of nails.
• DX 351 Cleaning Kit: Contains tools and brushes for routine maintenance.
• Case DX 351: For safe storage and transport of the tool and accessories.
• Concrete Nails X-P 22 MX (5000x): Fasteners designed for concrete applications.
• Cartridges 6.8/11 M.27 Cal Yellow (5000x): Powder loads used to power the tool.

4. Setup

Before operating the Hilti DX 351, ensure proper setup:

1. Attach Magazine: Securely attach the X-MX32 nail magazine to the tool body. Refer to the tool's markings for correct alignment and locking mechanism.
2. Load Cartridges: Insert the 6.8/11 M.27 cal yellow cartridges into the cartridge strip. Ensure the cartridges are fully seated and the strip is correctly loaded into the tool's cartridge chamber.
3. Load Fasteners: Insert the X-P 22 MX concrete nails into the magazine. Ensure they are properly aligned and feed smoothly.
4. Power Regulation: Adjust the power regulation dial (typically located at the rear of the tool) to the appropriate setting for the application and base material. Start with a lower setting and increase if necessary.
5. Function Check: Perform a quick function check to ensure all components are securely attached and operating freely.

5. Operating Instructions

Follow these steps for safe and effective operation:

1. Wear PPE: Always wear appropriate personal protective equipment, including eye and hearing protection.
2. Position Tool: Place the tool firmly and perpendicularly against the base material where the fastener is to be driven. Ensure the contact element is fully depressed.
3. Initiate Fastening: While maintaining firm pressure against the base material, pull the trigger to fire the cartridge and drive the fastener.
4. Release Pressure: After firing, release pressure from the tool and lift it from the work surface.
5. Check Fastening: Inspect the driven fastener to ensure it is properly seated. Adjust power settings if necessary for subsequent fastenings.
6. Clearing Misfires: In case of a misfire, keep the tool pressed against the work surface for at least 5 seconds. Then, carefully remove the cartridge strip and dispose of the misfired cartridge according to local regulations. Never attempt to re-fire a misfired cartridge.

6. Maintenance

Regular maintenance ensures the longevity and safe operation of your Hilti DX 351 tool.

• Daily Cleaning: After each use, or at least daily, clean the tool using the provided DX 351 Cleaning Kit. Pay special attention to the piston, barrel, and magazine areas to remove powder residue and debris.
• Inspection: Regularly inspect the piston, buffer, and other wear parts for signs of damage or excessive wear. Replace worn components immediately with genuine Hilti parts.
• Lubrication: Apply a thin layer of Hilti lubricant to moving parts as indicated in the detailed service instructions (not provided here, but implied).
• Storage: Store the clean and dry tool in its case, away from moisture and extreme temperatures. Remove all cartridges and fasteners before storage.
• Professional Service: For complex repairs or comprehensive servicing, contact an authorized Hilti service center.

7. Troubleshooting

This section addresses common issues you might encounter with the Hilti DX 351.

If problems persist after attempting these solutions, contact Hilti customer service or an authorized service center.

8. Specifications

• Model: Hilti DX 351
• Part Number: 3553035
• Included Components: DX351 Basic unit, X-P8S-351 Piston, Nail magazine X-MX32 assy, DX 351 Cleaning Kit, Case DX 351, 5000x Concrete nail X-P 22 MX, 5000x Cartridge 6.8/11 M.27 cal yellow
• Fastener Type: X-P 22 MX Concrete Nails
• Cartridge Type: 6.8/11 M.27 Cal Yellow
• Manufacturer: Hilti
• Style: Modern
• Batteries Required: No

9. Warranty and Support

Hilti products are designed for durability and reliability. For information regarding product warranty, service, or technical support, please refer to the official Hilti website or contact your local Hilti representative. Keep your purchase receipt for warranty claims.

For further assistance, visit the official Hilti website: www.hilti.com