Maintenance; Gun Tube Replaceable Parts - Lincoln Electric MAGNUM IM632-B Operator's Manual

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Periodically remove and clean the nozzle, contact tip
and gas diffuser. Replace the nozzle insulator if dam-
aged. Regular use of an anti-spatter compound will
reduce the adherence of spatter and ease its removal.
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.
CAUTION
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.
Figure E.1

MAINTENANCE

GUN TUBE ASSEMBLY
M4 X 0.7 THREAD
INSULATION RING
NOZZLE HOLDER
CERAMIC INSULATOR
GUN TUBE INSULATION DISK
DIFFUSER
MAGNUM® 450WC & 650WC

Gun Tube Replaceable Parts

a. The gun tube insulation disk should be periodi-
cally examined for wear. To replace the gun
tube insulation disk, remove the diffuser and pull
off the gun tube insulation disk. Although the
gun tube insulation disk does not have a thread,
it can be unscrewed from the gun tube. Refer to
Figure E.1.
b. The nozzle holder can be replaced if the threads
are damaged. Remove the diffuser and gun
tube insulation disk (refer to a. and Figure E.1).
Remove the two (2) set screws that lock the
nozzle holder in place. Unscrew the nozzle
holder. (Note: The nozzle holder has a Left
hand thread.) Pull the nozzle holder off the gun
tube assembly. Be careful to not drop the
ceramic that may come off with the nozzle hold-
er. Coat the inside diameter and the outside
diameter of the ceramic with DOW CORNING
340 joint compound (Lincoln part T12837).
Check that the insulation ring is in place and
place the ceramic on the gun tube. Place the
new nozzle holder over the ceramic and tighten
in place. Replace the two (2) set screws.
Replace the gun tube insulation disk and the dif-
fuser.
THREAD SIZES FOR MAGNUM
450WC & 650WC CONSUMABLES
M4 X 0.7 THREAD
M20 X 1.5 INTERNAL LEFT HAND THREAD
FOR 450WC & M24 X 1.5 LEFT HAND THREAD
FOR 650WC
SPECIAL THREAD
M11 X 1 FOR 450WC &
M12 X 1 FOR 650WC
M8 X 1.25
Figure E.2
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