Lincoln Electric IM351 LN-7 GMA Wire Feeder - Manual (Page 31)

B-1 OPERATION B-1
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:
• 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.
The K521 LN-7 semiautomatic constant speed wire
feeder is recommended for self-shielded flux-cored
Innershield® electrodes, submerged arc welding, and
other open arc welding. It has the following features:
• Wire feed dial [50 to 500 in./min (1.27 to 12.7
m/min)].
• 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.
LN-7 & LN-7 GMA
Read and understand this entire section before
operating your machine.
SAFETY INSTRUCTIONS
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts such
as output terminals or internal wiring.
• Insulate yourself from the work and
ground.
• Always wear dry insulating gloves.
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Only qualified personnel should operate this equip-
ment. Observe all safety information throughout this
manual.
WARNING
FUMES AND GASES
can be dangerous.
• Keep your head out of fumes.
• Use ventilation or exhaust to
remove fumes from breathing
zone.
ARC RAYS
can burn.
• Wear eye, ear and body
protection.
WELDING, CUTTING and
GOUGING SPARKS
can cause fire or explosion
• Keep flammable material away.
• Do not weld, cut or gouge on
containers that have held com-
bustibles.