Tweco 180 Portable MIG - Manual (Page 23)

INTRODUCTION FABRICATOR 140, 180
July 20, 2007 2-7 Manual 0-4991
2.09 Installing a New Wire Liner
1. Be sure that the Fabricator 180A MIG Gun cable is arranged in a straight line and free from twists when installing
or removing a wire liner (8). Remove the old liner by first removing the gun’s nozzle (1), contact tip (2) and gas
diffuser (3). Then remove the outlet guide (10) from the connector plug and pull the old wire liner out of the cable
assembly from the connector plug end.
2. To install a new wire liner, first inspect the o-ring gas seal on the liner for cuts or damage. Start from the connector
plug end of the assembly and begin pushing the liner through the connector plug, cable assembly (7), and into the
gun handle (5). If the liner should lodge along the way, gently whip or work the cable assembly (7) to aid forward
movement.
3. When the wire liner meets the end of the connector plug and the new raw end extends through the end of the
conductor tube assembly (4), the outlet guide (10) in the connector plug must be securely tightened onto the liner
to prevent its backward movement.
NOTE
When the liner assembly is fully inserted into the cable assembly and the liner stop is firmly against the
connector plug, the “raw end” of the liner will protrude out of the open end of the gun conductor tube. Trim
the wire liner so that it protrudes past the end of the conductor tube assembly (4) by approximately the
length of the gas diffuser (3); 1
1 /
16
" ± 1 /
16
" (27mm ± 1.5mm). See Figure 2-5. The trimmed end which seats
in the gas diffuser (3) must be filed and reamed smooth on the inside and outside radii so wire feed will not
be obstructed.
4. Replace gas diffuser (3), contact tip (2) and nozzle (1).
Wire Liner
Gas Diffuser
x x
Figure 2-5: Trim Wire Liner to Length Of Gas Diffuser
2.10 MIG Gun Maintenance
Remove dust and metallic particles from the gun conduit by forcing clean, dry compresses air into the conduit once a
week. This will minimize wire feeding problems.