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17
FIG. 15
FIG. 15
MAINTENANCE AND REPAIR
Replacement of the MIG gun welding wire conduit liner or MIG gun assembly may be
necessary due to age, damage from heat, or general operation. In the case of a drive
motor failure to feed wire, the motor may need replacement. These can be obtained as
replacement parts and installed by the user as follows.
MIG GUN LINER REPLACEMENT
• Before beginning, ensure power is off, the unit is unplugged, and the welding
wire has been removed from the liner.
• Remove the four screws holding the MIG gun clamshell together, then remove
the hook at the top of the torch. The clamshell can now be split in half to reveal
the internals
(FIG 15)
. Note that the valve body has a specific orientation so that
the MIG gun trigger wires can slip in. This will be important for reassembly.
• The brass fitting attached to the end of the liner must be unfastened from the
valve trigger body fully using a 10mm wrench. This end of the liner is now
prepared for removal
(FIG 16)
.
• At the drive motor, remove the four screws
(FIG 17)
securing the top cover to
free the liner
(FIG 18)
.
• It may be necessary to disassemble the strain relief and bulkhead coupling to
minimize friction for installation of the new liner
(FIG 19)
. Heating lightly may
also help to relieve some of the tension the jacket may apply on the internal
lines. The liner should move freely with very little force.
• When removing the torch liner, pull it out from the MIG gun end, while keeping
the cable taut straight out of the welder to minimize resistance. With the old
liner fully removed, the replacement can be slipped into the same pathway and
pushed through to the other end, exactly as the old one came out.
• Reassemble the MIG gun in reverse order.
FIG. 16
FIG. 16
FIG. 17
FIG. 17
FIG. 19
FIG. 19
FIG. 18
FIG. 18
Drive Motor
Top Cover
