Maintenance; Removal, Installation And Trimming Instructions For Magnum Liners; Gun Tubes And Nozzles; Gun Cables - Lincoln Electric MAGNUM 250 Operator's Manual

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removAl, instAllAtion AnD trimming
instructions For mAgnum
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.
b. Remove the gas diffuser and insulator 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 MAG-
NUM ® 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 3 socket-
head clamping screws in handle with an Allen
wrench. Remove a knurled nut at the base of the
handle. Remove gas nozzle diffuser and nozzle
insulator, on the threaded gun tube from the cable
assembly.
D. To reinstall, reverse procedure.

MAINTENANCE

gun cAbles

® liners

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.
------------------------------------------------------------------------
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 k2646-[ ], k2647-[ ],
k2649-[ ], k2650- [ ], K2651[ ], K2652-[ ],
K2653-[ ] and K2655-[ ] moDels)
The MAGNUM® PRO 250, 350, 450 & 550 Amp guns
feature the use of repairable cable connectors. If the
cable ever gets severely damaged. it may be cut short-
er 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
b. Remove the gun tube per Gun Tubes and Nozzles
c. Remove three screws from the gun handle, remove
d. Remove gun tube connector from cable by
e. Uncouple the strain relief by pushing its outer hous-
f. Cut off the damaged section of cable and strip off
MAGNUM® PRO 250, 350, 450 & 550 AMP
CAUTION
and Trimming Instructions.
Section.
the knurled nut separate the two halves, and
remove the cable from the handle along with the
trigger assembly.
unscrewing connector nut from gun tube connector.
If the cable inner tube is difficult to remove from the
connector assembly, carefully slit it lengthwise with
a knife up to the copper connector.
ing toward the middle of the cable. Move the strain
relief and the cable boot toward the middle of the
cable, past the damaged section.
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