Lincoln Electric IM351 LN-7 GMA Wire Feeder - Manual (Page 50)

D-2 MAINTENANCE D-2
Gun Cables (All)
A dirty gun cable can cause rough and erratic wire
feeding. Therefore, the cable liner must be cleaned
periodically. Clean Innershield gun cables after using
approximately 300 pounds of electrode; clean sub-
merged arc gun cables after using approximately 600
pounds of electrode.
Remove the cable from the wire feeder. Lay it out
straight on the floor. Remove the contact nozzle tip
from the gun. Using an air hose and only partial pres-
sure, gently blow out the cable. Work the full length of
the cable by bending it back and forth and then blow it
out again. Repeat this procedure until no more dirt
comes out.
AUTOMATIC FLUX FEEDING SYSTEM
(K320)
The only maintenance required on the flux feeding
system is cleaning the water and sludge trap sump.
Do this every six months or whenever air no longer
escapes from the coiled tube under the flux tank.
TO CLEAN:
Turn off the incoming air and release the tank pres-
sure. Remove the coiled aluminum tubing from the
bottom of the filter unit. Remove the pinched copper
end piece from the end of the aluminum tube. Wash
all the material out of the aluminum tube. Clean out
the short pinched section; this should have a gap of
between .005 to .050 in. to allow a small amount of air
to escape when the equipment is being used. If this
end piece is badly corroded, replace it with a new
piece.
Loosen the collar on the 2-1/8 inch steel filter tube and
take the filter tube off the machine. Wash out com-
pletely. Fit steel tube back into its bottom. Fill the
steel tube to within two inches of the top with any
clean Lincoln submerged arc welding flux.
Raise the steel tube into place and tighten the collar.
When the air pressure is turned on again, part of the
flux in the steel tube will be forced into the coiled tube.
Be certain a small amount of air is escaping from the
pinched end of the copper tube.
LN-7 & LN-7 GMA