Transmig 210, 250, 310, 330
Page 22 of 31 DOC No: MIGTRN0001
Date: 14/09/98 Issue No: 2
7.4 Installing A New Conduit Liner
a) Be sure the MIG Torch cable is arranged in a straight line, free from twists, when installing
or removing a conduit liner. Remove the old conduit liner by first removing the MIG
Torches nozzle, contact tip and gas diffuser. Then loosen set screws (8/32 UNC) in the
conductor tube and connector plug and pull the old conduit liner out of the cable assembly
from the connector plug end.
b) To install a new conduit liner, first inspect the o-ring gas seal on the conduit liner for cuts
or damage. Start from the connector plug end of the assembly and begin pushing the
conduit liner through the connector plug, cable assembly and into the gun. If the conduit
liner should lodge along the way, gently whip or work the cable assembly to aid forward
movement.
c) When the conduit liner stop meets the end of the connector plug and the new raw end
extends through the end to the conductor tube, the Allen screw in the connector plug must
be securely tightened onto the conduit liner to prevent its backward movement.
IMPORTANT 1: When the conduit liner is fully inserted into the cable assembly and the conduit
liner stop is firmly against the Connector Plug, the "raw end" of the conduit
liner will protrude out of the open end of the gun conductor tube. Trim the
conduit liner as shown in Figure 11. The trimmed end which seats in the Gas
Diffuser must be filed and reamed smooth on the inside and outside radii so the
electrode wire will not be obstructed.
d) Replace Gas Diffuser, Contact Tip, and Nozzle.
e) Tighten the Allen screw in the conductor tube.
WARNING 6: Do not over tighten the conductor tube screw as this action will result in the
distortion of the conduit liner and will lead to wire feedability problems.
34 mm
(1.34")
Conductor tube
Conduit
Figure 11 - Conduit liner trim length
7.5 MIG Torch Maintenance
Remove dust and metallic particles from the torch conduit liner by forcing clean, dry compressed air
into the conduit liner once a week. This will minimise wire feeding problems.
