How To Install or Replace a Liner on a BTB MIG Gun

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Bernard® Conventional Liners

1. Remove nozzle, contact tip, and gas diffuser / retaining head and lay cable straight. Using a 10 mm wrench, turn liner lock counterclockwise until it is free from the power pin. Remove liner from gun assembly.
    
2. With cable laying straight, insert new liner into power pin and feed through gun using short strokes to prevent kinking. Twist liner clockwise if necessary. Use a 10 mm wrench to turn liner lock clockwise to tighten into power pin.
    
3. Trim to dimensions shown in the liner chart below. Remove all burrs from end of liner and replace gas diffuser /retaining head, contact tip and nozzle.  

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QUICK LOAD® Liners 

1. Remove the nozzle, contact tip and gas diffuser and lay cable straight. Pull the QUICK LOAD Liner from the end of the neck using pliers.
    
2. Remove the protective cap from the new QUICK LOAD Liner and insert it through the neck using the wire as a guide. Feed the liner through the gun using short strokes to prevent kinking.
    
3. Once the liner stops feeding, give it an extra push to ensure it is seated correctly. Push the liner into gun and trim to dimensions shown in the New Liner Trim Lengths Chart. Remove all burrs from end of liner and replace gas diffuser, contact tip and nozzle.  

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Jump Liners 

1. Remove the nozzle, gas diffuser and neck. Remove used Jump Liner from the back end of neck.
    
2. Insert new Jump Liner making sure the liner stop is fully seated at the back of the neck.
    
3. Take the tapered end of the neck and insert into end fitting of the gun handle. Install the neck.
    
4. Trim Jump Liner to dimensions shown in New Liner Trim Lengths Chart. Deburr the Jump Liner past the nozzle end of the neck.
    
5. Install gas diffuser, contact tip and nozzle.
    

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