How to Change the Liner on a Millermatic 251
Creating his first welder by hammering together scrap sheet metal, coil and core materials in his basement, Niels Miller discovered how to produce less expensive, small arc welders than the DC welders available in 1929. Since 1929, the Miller company continues to manufacture welding equipment, offering a five-year parts, three-year labor limited warranty, plus a 90-day parts and labor warranty on the gun. Your Millermatic 251 comes with a 12-foot, 250 amp, M-25 MIG gun. Changing the liner on your Millermatic 251 does not require much of your time, so you can quickly return to your welding. Does this Spark an idea?
Things You'll Need
- Safety glasses with side shields
- Insulated welding gloves
- Pliers
- Side cutters
- 5/16-inch double-sided end wrench
- 10 mm double-sided end wrench
Instructions
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1
Put on safety glasses even if you wear a welding helmet. Wear insulated welding gloves. The glasses will protect you from any chipping of flying metal and the gloves protect your hands from hot parts. Allow the gun to cool before working on it.
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2
Disconnect the gun from the gun connection on the bottom of your unit's control panel. Remove the nozzle, the contact tip using pliers, and then the adapter from the head tube using a 5/16-inch double-sided end wrench.
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3
Remove the liner. Use a 10 mm double-sided end wrench from the head tube end.
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4
Place the gun cable out in a straight position. Blow out the gun casing through the head tube end.
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5
Install a new gun liner. Tighten it with the 10 mm wrench. Cut the liner off 3/4 inch from the head tube with a side cutter. For aluminum liners, cut the liner off 3/8 inch from the head tube.
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Reinstall the adapter, contact tip and the nozzle.
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Tips & Warnings
To order parts or receive help with your welding questions, call your Miller distributor at 800-426-4553.
If you wear a pacemaker, consult your doctor before welding. Welding current through the welding cables causes electromagnetic fields, which may affect the operation of your pacemaker.
References
Resources
- Photo Credit Jupiterimages/Comstock/Getty Images
