Troubleshooting - Lincoln Electric K309 Operator's Manual

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.

Trouble

Poor smoke pickup

Poor arc action or erratic feeding.

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.