Thermal Arc 281 FABRICATOR, Service Manual

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FABRICATOR 281
OPERATION 4-10 Manual No. 0-4880B
4.04 Installing A New Wire Conduit
1. Be sure the MIG gun cable is arranged in a straight line, free from twists, when installing or removing a
wire conduit. Remove the old conduit by first removing the MIG gun nozzle, contact tip, insulator and gas
diffuser. Then loosen Allen screws in the conductor tube and connector plug and pull the old wire conduit
out of the cable assembly from the connector plug end.
2. To install a new conduit, first inspect the o-ring gas seal on the conduit for cuts or damage. Start from
the connector plug end of the assembly and begin pushing the conduit through the connector plug, cable
assembly and into the gun. If the conduit should lodge along the way, gently whip or work the cable
assembly to aid forward movement.
When the conduit stop meets the end of the connector plug and the new raw end extends through the end
of the conductor tube on the welding gun, tighten the Allen screw in the connector plug onto the conduit to
prevent its backward movement.
CONDUCTOR TUBE
CONDUIT LINER
CONDUIT LINER
1 1/16"
(27mm)
Art # A-07330
REMOVE
CONSUMABLES
ALLEN SCREW
O-RINGS
ALLEN SCREW
CONNECTOR PLUG
Figure 4-12: Conduit Trim Length
NOTE
When the conduit is fully inserted into the cable assembly and the conduit stop is firmly against the
Connector Plug, the “raw end” of the conduit will protrude out of the open end of the gun conductor
tube. Trim the conduit as shown in Figure 4-12. The trimmed end which seats in the Gas Diffuser must
be filed and reamed smooth on the inside and outside radii so wire feed will not be obstructed.
3. Replace Gas Diffuser, Contact Tip, Insulator and Nozzle.
4. Tighten the Allen screw in the conductor tube.
CAUTION
Do not over tighten the conductor tube screw as this action will result in the distortion of the conduit and
will lead to wire feedability problems.