Lincoln Electric IM550 K309 Flux-Cored Fume Gun - Manuel (Page 8)

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FLUX CORED FUME GUN
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c. Clean exhaust hose behind the gun by squeezing
along entire length to break up collected spatter.
Blockage will usually occur within 4 feet of gun
handle. Exhaust hose should be cleaned every
coil of electrode unless more frequent cleaning is
indicated. An exhaust hose blockage can also be
cleared by running a wire or electrode through the
inside diameter of the hose.
The end of the intake tube will deteriorate from the
heat of arc and must be replaced when tube is too
short to pick up smoke. The useful life of the intake
tube can be extended by pulling it out of the connect-
ing tube until the intake end is even with the end of
the nozzle. See parts list illustration.
Gun Cables
Clean cables after using approximately 300 pounds of
electrode. Remove the cable from the wire feeder and
lay it out straight on the floor. Remove the contact
nozzle tip from the gun. Using an air hose and only
partial pressure, gently blow out the cable from the
gun end. Too much pressure at the start will 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.
Gun Nozzle
a. Replace worn contact tips as required.
b. Remove spatter from tip or extension guide after
each ten minutes of arc time as required.
c. Replace worn spring liner in nozzle. The life of the
liner can be doubled by rotating the liner 180°. The
liner can be pulled out the back end of the nozzle
by wedging the blade of a small screwdriver in the
I.D. and pulling.
d. Internal parts of nozzle can be removed and
replaced by removing the internal hollow-lock set
screw from the contact tip end of the nozzle with a
5/32” Allen wrench.
The ceramic insert and retainer will normally fall out
the end of the nozzle but if they do not, gently drive
the spring liner towards the outgoing end of the noz-
zle.
See the parts list pages for construction details and
replacement parts. When re-assembling the nozzle,
make certain that the ceramic nozzle insert is placed
next to the spring liner. The hollow-lock set screw is to
be tightened to give .38” as measured from the end of
the nozzle to the hollow-lock set screw.
TROUBLESHOOTING
Trouble Cause Remedy
Poor smoke pickup Vacuum unit not operating correctly. Clean filters or repair vacuum unit.
Spatter buildup on intake tube or I.D. of Remove spatter and clear all passages.
aluminum tube in handle.
Hoses blocked or damaged. Clean or repair hoses.
Strong drafts. Eliminate strong drafts or construct barriers
so draft will not affect smoke removal.
Visible stickout is too long. Shorten visible stickout to
recommended length.
Poor arc action or erratic feeding. Worn contact tip or nozzle. Replace worn parts.
Dirty cable. Blow out cable with compressed air.