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MAINTENANCE
REMOVAL, INSTALLATION AND TRIMMING
INSTRUCTIONS FOR MAGNUM LINERS
NOTE: The variation in cable lengths prevents the
interchangeability of liners. Once a liner has been cut
for a particular gun, it should not be installed in anoth-
er gun, unless it can meet the liner cut off length
requirement. Liners are shipped with the jacket of the
liner extended the proper amount.
a. Remove the gas nozzle and nozzle insulator.
Loosen the set screw located in the side of the dif-
fuser with 5/64 (2.0 mm) Allen wrench (provided
with the gun or connector kit).
b. Remove the gas diffuser from gun.
c. Lay gun and cable out straight on a flat surface. For
all K466 except K466-3 and K466-4 Connections:
Loosen set screw located in the brass cable con-
nector at the wire feeder end of the cable using the
same 5/64 (2.0 mm) Allen wrench. Pull liner out of
cable. (REFER TO FIGURE 1 IN INSTALLATION
FOR EACH)
<OR>
For K466-3 and K466-4 CONNECTIONS:
Remove the connector cap with the wrench provid-
ed. Pull liner out of cable. If the liner is going to be
replaced with a different size liner, loosen set screw
on the connector cap and remove piece of liner
material.
d. For installation and trimming instructions for
Magnum liners see “LINER INSTALLATION” in
INSTALLATION section.
GUN TUBES AND NOZZLES
a. Replace worn contact tips as required.
b. Remove spatter from inside of gas nozzle and from
tip after each 10 minutes of arc time or as required.
c. To remove gun tube from gun, loosen socket-head
clamping screw in handle with 3/16” (4.8 mm) Allen
wrench. Remove gas nozzle and nozzle insulator
and also loosen small set screw in the diffuser
using 5/64” (2.0 mm) Allen wrench.
NOTE: Small set screw in the diffuser must be
loosened, otherwise liner could be damaged when
attempting to remove gun tube.
Pull gun tube out from gun handle. To reinstall,
insert the gun tube, push in as far as possible and
retighten screws.
GUN CABLES
CABLE CLEANING
Clean cable liner after using approximately 300
pounds (136 kg) of electrode. Remove the cable from
the wire feeder and lay it out straight on the floor.
Remove the contact tip from the gun. Using an air
hose and only partial pressure, gently blow out the
cable liner from the gas diffuser end.
Excessive pressure at the start may cause the dirt
to form a plug.
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Flex the cable over its entire length and again blow out
the cable. Repeat this procedure until no further dirt
comes out.
CABLE REPAIR (ALL K470, K471 & K541
MODELS)
The Magnum 300 and Magnum 400 guns feature the
use of repairable cable connectors. If the cable ever
gets severely damaged. it may be cut shorter and
repaired by the user. Repair cables as follows:
GUN TUBE END REPAIR (Requires 2 S19492-2
Terminals)
a. Remove the cable liner per Removal, Installation
and Trimming Instructions.
b. Remove the gun tube per Gun Tubes and Nozzles
Section.
c. Remove three #6 screws from the gun handle, sep-
arate the two halves, and remove the cable from
the handle along with the trigger assembly.
d. Remove gun tube connector from cable by
unscrewing connector nut from gun tube connec-
tor. If the cable inner tube is difficult to remove from
the connector assembly, carefully slit it lengthwise
with a knife up to the brass connector.
MAGNUM 300 & 400
CAUTION
D-1D-1