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OPERATING INSTRUCTIONS
Read and understand the entire Operation Section
prior to operating the machine.
SAFETY PRECAUTIONS
ELECTRIC SHOCK
can kill.
• Do not touch electrically live parts
or electrode with skin or wet
clothing.
• Insulate yourself from work or
ground.
• Always wear dry insulating
gloves.
FUMES AND GASES
can be dangerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to
remove fumes from breathing
zone.
WELDING SPARKS
can cause fire or explosion.
• Keep flammable material away.
• Do not weld on containers that
have held combustibles.
ARC RAYS
can burn.
• Wear eye, ear, and body
protection.
Observe additional Safety Guidelines detailed in
the beginning of this manual.
GENERAL DESCRIPTION
The K440 LN-7 GMA semiautomatic constant speed
wire feeder is specifically equipped for gas metal arc
welding using flux-cored Outershield electrodes and
solid wire. The LN-7 GMA is also suitable for self-
shielded flux-cored Innershield electrodes, submerged
arc welding (if constant voltage is satisfactory), and
other open arc welding. It has been factory assembled
with the following features:
• Calibrated wire feed dial [75 to 700 in./min (1.9 to
17.8 m/min)].
• Factory installed gas solenoid valve and gas fittings.
• Wire drive uses a permanent magnet motor and
includes tool-less “quick- release” idle roll pressure
arm, outgoing guide tube and gun cable fastening.
• Optional factory installed water solenoid and fittings
for use with water cooled welding guns.
The K567-1 LN-7 GMA 4-Roll is designed to provide
the additional feeding force required when using gun
cables over 15 ft (4.6 m) long or when the wire is pulled
long distances (such as when bulk packages are
used). Because the four-roll feeder has twice the
contact surface, it can also help when feeding softer
wires by delivering the same or more feeding force as
the two-roll with less overall wire deformation. Wire
size range, speed and features are the same as other
LN-7 GMA models.
RECOMMENDED PROCESSES AND
EQUIPMENT
The LN-7 GMA is recommended for use in MIG and
Innershield welding applications with constant voltage
power sources such as the Idealarc DC-250, 400, or
600, or CV types. The LN-7 is capable of feeding wires
ranging from 0.023 in. through 1/16 in. (0.6 through
1.6 mm) solid, 0.045 in. through 5/64 in. (1.2 through
2.0 mm) Innershield, and 0.062 in. through 5/64 in.
(1.6 through 2.0 mm) Outershield electrodes.
OPERATIONB-2
LN-7 GMA WIRE FEEDER
WARNING