Lincoln Electric K1802-1, K514, K2286-1, K470, K471 User Manual

MAGNUM 300 and 400

GMA GUN & CABLE ASSEMBLIES

OPERATOR’S MANUAL

IM381-D

October, 2005

Safety Depends on You

Lincoln arc welding and cutting
equipment is designed and built
with safety in mind. However,
your overall safety can be
increased by proper installation
... and thoughtful operation on
your part. DO NOT INSTALL,
OPERATE OR REPAIR THIS
EQUIPMENT WITHOUT READ­ING THIS MANUAL AND THE
SAFETY PRECAUTIONS CON­TAINED THROUGHOUT. And,
most importantly, think before you
act and be careful.

Models

K574 is now located in IM646

K470 K1802-1
K471 K2286-1
K541

®

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: [phone] FAX: [phone] WEB SITE: www.lincolnelectric.com

• World's Leader in Welding and Cutting Products •

Copyright © 2005 Lincoln Global Inc.

FOR ENGINE
powered equipment.

1.a. Turn the engine off before troubleshooting and maintenance
work unless the maintenance work requires it to be running.

____________________________________________________

1.b. Operate engines in open, well-ventilated
areas or vent the engine exhaust fumes
outdoors.

____________________________________________________

1.c. Do not add the fuel near an open flame weld­ing arc or when the engine is running. Stop
the engine and allow it to cool before refuel­ing to prevent spilled fuel from vaporizing on
contact with hot engine parts and igniting. Do
not spill fuel when filling tank. If fuel is spilled,
wipe it up and do not start engine until fumes
have been eliminated.

____________________________________________________

1.d. Keep all equipment safety guards, covers and devices in posi­tion and in good repair.Keep hands, hair, clothing and tools
away from V-belts, gears, fans and all other moving parts
when starting, operating or repairing equipment.

____________________________________________________

1.e. In some cases it may be necessary to remove safety

guards to perform required maintenance. Remove
guards only when necessary and replace them when the
maintenance requiring their removal is complete.
Always use the greatest care when working near moving
parts.

___________________________________________________

1.f. Do not put your hands near the engine fan.
Do not attempt to override the governor or
idler by pushing on the throttle control rods
while the engine is running.

___________________________________________________

1.g. To prevent accidentally starting gasoline engines while
turning the engine or welding generator during maintenance
work, disconnect the spark plug wires, distributor cap or
magneto wire as appropriate.

i

SAFETY

i

ARC WELDING CAN BE HAZARDOUS. PROTECT YOURSELF AND OTHERS FROM POSSIBLE SERIOUS INJURY OR DEATH.
KEEP CHILDREN AWAY. PACEMAKER WEARERS SHOULD CONSULT WITH THEIR DOCTOR BEFORE OPERATING.

Read and understand the following safety highlights. For additional safety information, it is strongly recommended that you
purchase a copy of “Safety in Welding & Cutting - ANSI Standard Z49.1” from the American Welding Society, P.O. Box 351040,
Miami, Florida 33135 or CSA Standard W117.2-1974. A Free copy of “Arc Welding Safety” booklet E205 is available from the
Lincoln Electric Company, 22801 St. Clair Avenue, Cleveland, Ohio 44117-1199.

BE SURE THAT ALL INSTALLATION, OPERATION, MAINTENANCE AND REPAIR PROCEDURES ARE
PERFORMED ONLY BY QUALIFIED INDIVIDUALS.

WARNING

Mar ‘95

ELECTRIC AND
MAGNETIC FIELDS
may be dangerous

2.a. Electric current flowing through any conductor causes
localized Electric and Magnetic Fields (EMF). Welding
current creates EMF fields around welding cables and
welding machines.

2.b. EMF fields may interfere with some pacemakers, and
welders having a pacemaker should consult their physician
before welding.

2.c. Exposure to EMF fields in welding may have other health
effects which are now not known.

2.d. All welders should use the following procedures in order to
minimize exposure to EMF fields from the welding circuit:

2.d.1.

Route the electrode and work cables together - Secure
them with tape when possible.

2.d.2. Never coil the electrode lead around your body.

2.d.3. Do not place your body between the electrode and

work cables. If the electrode cable is on your right
side, the work cable should also be on your right side.

2.d.4. Connect the work cable to the workpiece as close as

possible to the area being welded.

2.d.5. Do not work next to welding power source.

1.h. To avoid scalding, do not remove the
radiator pressure cap when the engine is
hot.

CALIFORNIA PROPOSITION 65 WARNINGS

Diesel engine exhaust and some of its constituents
are known to the State of California to cause can­cer, birth defects, and other reproductive harm.

The engine exhaust from this product contains
chemicals known to the State of California to cause
cancer, birth defects, or other reproductive harm.

The Above For Diesel Engines

The Above For Gasoline Engines

ii

SAFETY

ii

ARC RAYS can burn.

4.a. Use a shield with the proper filter and cover
plates to protect your eyes from sparks and
the rays of the arc when welding or observing
open arc welding. Headshield and filter lens
should conform to ANSI Z87. I standards.

4.b. Use suitable clothing made from durable flame-resistant
material to protect your skin and that of your helpers from
the arc rays.

4.c. Protect other nearby personnel with suitable, non-flammable
screening and/or warn them not to watch the arc nor expose
themselves to the arc rays or to hot spatter or metal.

ELECTRIC SHOCK can kill.

3.a. The electrode and work (or ground) circuits
are electrically “hot” when the welder is on.
Do not touch these “hot” parts with your bare
skin or wet clothing. Wear dry, hole-free
gloves to insulate hands.

3.b. Insulate yourself from work and ground using dry insulation.
Make certain the insulation is large enough to cover your full
area of physical contact with work and ground.

In addition to the normal safety precautions, if welding
must be performed under electrically hazardous
conditions (in damp locations or while wearing wet
clothing; on metal structures such as floors, gratings or
scaffolds; when in cramped positions such as sitting,
kneeling or lying, if there is a high risk of unavoidable or
accidental contact with the workpiece or ground) use
the following equipment:

• Semiautomatic DC Constant Voltage (Wire) Welder.

• DC Manual (Stick) Welder.

• AC Welder with Reduced Voltage Control.

3.c. In semiautomatic or automatic wire welding, the electrode,
electrode reel, welding head, nozzle or semiautomatic
welding gun are also electrically “hot”.

3.d. Always be sure the work cable makes a good electrical
connection with the metal being welded. The connection
should be as close as possible to the area being welded.

3.e. Ground the work or metal to be welded to a good electrical
(earth) ground.

3.f.

Maintain the electrode holder, work clamp, welding cable and
welding machine in good, safe operating condition. Replace
damaged insulation.

3.g. Never dip the electrode in water for cooling.

3.h. Never simultaneously touch electrically “hot” parts of
electrode holders connected to two welders because voltage
between the two can be the total of the open circuit voltage
of both welders.

3.i. When working above floor level, use a safety belt to protect
yourself from a fall should you get a shock.

3.j. Also see Items 6.c. and 8.

FUMES AND GASES
can be dangerous.

5.a. Welding may produce fumes and gases
hazardous to health. Avoid breathing these
fumes and gases.When welding, keep
your head out of the fume. Use enough
ventilation and/or exhaust at the arc to keep

fumes and gases away from the breathing zone. When

welding with electrodes which require special
ventilation such as stainless or hard facing (see
instructions on container or MSDS) or on lead or
cadmium plated steel and other metals or coatings
which produce highly toxic fumes, keep exposure as
low as possible and below Threshold Limit Values (TLV)
using local exhaust or mechanical ventilation. In
confined spaces or in some circumstances, outdoors, a
respirator may be required. Additional precautions are
also required when welding on galvanized steel.

5.b.

Do not weld in locations near chlorinated hydrocarbon

vapors
coming from degreasing, cleaning or spraying operations.
The heat and rays of the arc can react with solvent vapors

to
form phosgene, a highly toxic gas, and other irritating
products.

5.c. Shielding gases used for arc welding can displace air and
cause injury or death. Always use enough ventilation,
especially in confined areas, to insure breathing air is safe.

5.d. Read and understand the manufacturer’s instructions for this

equipment and the consumables to be used, including the
material safety data sheet (MSDS) and follow your
employer’s safety practices. MSDS forms are available from
your welding distributor or from the manufacturer.

5.e. Also see item 1.b.

Mar ‘95

iii

SAFETY

iii

FOR ELECTRICALLY
powered equipment.

8.a. Turn off input power using the disconnect
switch at the fuse box before working on
the equipment.

8.b. Install equipment in accordance with the U.S. National
Electrical Code, all local codes and the manufacturer’s
recommendations.

8.c. Ground the equipment in accordance with the U.S. National
Electrical Code and the manufacturer’s recommendations.

CYLINDER may explode
if damaged.

7.a. Use only compressed gas cylinders
containing the correct shielding gas for the
process used and properly operating
regulators designed for the gas and

pressure used. All hoses, fittings, etc. should be suitable for
the application and maintained in good condition.

7.b. Always keep cylinders in an upright position securely
chained to an undercarriage or fixed support.

7.c. Cylinders should be located:

• Away from areas where they may be struck or subjected to

physical damage.

• A safe distance from arc welding or cutting operations and

any other source of heat, sparks, or flame.

7.d. Never allow the electrode, electrode holder or any other
electrically “hot” parts to touch a cylinder.

7.e. Keep your head and face away from the cylinder valve outlet
when opening the cylinder valve.

7.f. Valve protection caps should always be in place and hand
tight except when the cylinder is in use or connected for
use.

7.g. Read and follow the instructions on compressed gas
cylinders, associated equipment, and CGA publication P-l,
“Precautions for Safe Handling of Compressed Gases in
Cylinders,” available from the Compressed Gas Association
1235 Jefferson Davis Highway, Arlington, VA 22202.

Mar ‘95

WELDING SPARKS can
cause fire or explosion.

6.a.

Remove fire hazards from the welding area.

If this is not possible, cover them to prevent

the welding sparks from starting a fire.

Remember that welding sparks and hot
materials from welding can easily go through small cracks
and openings to adjacent areas. Avoid welding near
hydraulic lines. Have a fire extinguisher readily available.

6.b. Where compressed gases are to be used at the job site,
special precautions should be used to prevent hazardous
situations. Refer to “Safety in Welding and Cutting” (ANSI
Standard Z49.1) and the operating information for the
equipment being used.

6.c. When not welding, make certain no part of the electrode
circuit is touching the work or ground. Accidental contact can
cause overheating and create a fire hazard.

6.d. Do not heat, cut or weld tanks, drums or containers until the
proper steps have been taken to insure that such procedures
will not cause flammable or toxic vapors from substances
inside. They can cause an explosion even

though

they have
been “cleaned”. For information, purchase “Recommended
Safe Practices for the

Preparation

for Welding and Cutting of
Containers and Piping That Have Held Hazardous
Substances”, AWS F4.1 from the American Welding Society

(see address above).

6.e. Vent hollow castings or containers before heating, cutting or
welding. They may explode.

6.f.

Sparks and spatter are thrown from the welding arc. Wear oil
free protective garments such as leather gloves, heavy shirt,
cuffless trousers, high shoes and a cap over your hair. Wear
ear plugs when welding out of position or in confined places.
Always wear safety glasses with side shields when in a
welding area.

6.g. Connect the work cable to the work as close to the welding
area as practical. Work cables connected to the building
framework or other locations away from the welding area
increase the possibility of the welding current passing
through lifting chains, crane cables or other alternate circuits.
This can create fire hazards or overheat lifting chains or
cables until they fail.

6.h. Also see item 1.c.

iv

SAFETY

iv

PRÉCAUTIONS DE SÛRETÉ

Pour

votre propre protection lire et observer toutes les instructions
et les précautions de sûreté specifiques qui parraissent dans ce
manuel aussi bien que les précautions de sûreté générales suiv­antes:

Sûreté Pour Soudage A L’Arc

1. Protegez-vous contre la secousse électrique:

a. Les circuits à l’électrode et à la piéce sont sous tension

quand la machine à souder est en marche. Eviter toujours
tout contact entre les parties sous tension et la peau nue
ou les vétements mouillés. Porter des gants secs et sans
trous pour isoler les mains.

b. Faire trés attention de bien s’isoler de la masse quand on

soude dans des endroits humides, ou sur un plancher met­allique ou des grilles metalliques, principalement dans
les positions assis ou couché pour lesquelles une grande
partie du corps peut être en contact avec la masse.

c. Maintenir le porte-électrode, la pince de masse, le câble de

soudage et la machine à souder en bon et sûr état defonc­tionnement.

d.Ne jamais plonger le porte-électrode dans l’eau pour le

refroidir.

e. Ne jamais toucher simultanément les parties sous tension

des porte-électrodes connectés à deux machines à soud­er parce que la tension entre les deux pinces peut être le
total de la tension à vide des deux machines.

f. Si on utilise la machine à souder comme une source de

courant pour soudage semi-automatique, ces precautions
pour le porte-électrode s’applicuent aussi au pistolet de
soudage.

2. Dans le cas de travail au dessus du niveau du sol, se protéger
contre les chutes dans le cas ou on recoit un choc. Ne jamais
enrouler le câble-électrode autour de n’importe quelle partie
du corps.

3. Un coup d’arc peut être plus sévère qu’un coup de soliel,
donc:

a. Utiliser un bon masque avec un verre filtrant approprié

ainsi qu’un verre blanc afin de se protéger les yeux du ray­onnement de l’arc et des projections quand on soude ou
quand on regarde l’arc.

b. Porter des vêtements convenables afin de protéger la

peau de soudeur et des aides contre le rayonnement de
l‘arc.

c. Protéger l’autre personnel travaillant à proximité au

soudage à l’aide d’écrans appropriés et non-inflammables.

4. Des gouttes de laitier en fusion sont émises de l’arc de
soudage. Se protéger avec des vêtements de protection libres
de l’huile, tels que les gants en cuir, chemise épaisse, pan­talons sans revers, et chaussures montantes.

5. Toujours porter des lunettes de sécurité dans la zone de
soudage. Utiliser des lunettes avec écrans lateraux dans les
zones où l’on pique le laitier.

6. Eloigner les matériaux inflammables ou les recouvrir afin de
prévenir tout risque d’incendie dû aux étincelles.

7. Quand on ne soud

e pas, poser la pince à une endroit isolé de
la masse. Un court-circuit accidental peut provoquer un
échauffement et un risque d’incendie.

8. S’assurer que la masse est connectée le plus prés possible de
la zone de travail qu’il est pratique de le faire. Si on place la
masse sur la charpente de la construction ou d’autres endroits
éloignés de la zone de travail, on augmente le risque de voir
passer le courant de soudage par les chaines de levage,
câbles de grue, ou autres circuits. Cela peut provoquer des
risques d’incendie ou d’echauffement des chaines et des
câbles jusqu’à ce qu’ils se rompent.

9. Assurer une ventilation suffisante dans la zone de soudage.
Ceci est particuliérement important pour le soudage de tôles
galvanisées plombées, ou cadmiées ou tout autre métal qui
produit des fumeés toxiques.

10. Ne pas souder en présence de vapeurs de chlore provenant
d’opérations de dégraissage, nettoyage ou pistolage. La
chaleur ou les rayons de l’arc peuvent réagir avec les vapeurs
du solvant pour produire du phosgéne (gas fortement toxique)
ou autres produits irritants.

11. Pour obtenir de plus amples renseignements sur la sûreté, voir
le code “Code for safety in welding and cutting” CSA Standard
W 117.2-1974.

PRÉCAUTIONS DE SÛRETÉ POUR
LES MACHINES À SOUDER À
TRANSFORMATEUR ET À
REDRESSEUR

1. Relier à la terre le chassis du poste conformement au code de
l’électricité et aux recommendations du fabricant. Le dispositif
de montage ou la piece à souder doit être branché à une
bonne mise à la terre.

2. Autant que possible, I’installation et l’entretien du poste seront
effectués par un électricien qualifié.

3. Avant de faires des travaux à l’interieur de poste, la debranch­er à l’interrupteur à la boite de fusibles.

4. Garder tous les couvercles et dispositifs de sûreté à leur
place.

Mar. ‘93

vv

Thank You

for selecting a QUALITY product by Lincoln Electric. We want you
to take pride in operating this Lincoln Electric Company product •••
as much pride as we have in bringing this product to you!

Read this Operators Manual completely before attempting to use this equipment. Save this manual and keep it
handy for quick reference. Pay particular attention to the safety instructions we have provided for your protection.
The level of seriousness to be applied to each is explained below:

WARNING

This statement appears where the information must be followed exactly to avoid serious personal injury or
loss of life.

This statement appears where the information must be followed to avoid minor personal injury or damage to
this equipment.

CAUTION

Please Examine Carton and Equipment For Damage Immediately

When this equipment is shipped, title passes to the purchaser upon receipt by the carrier. Consequently, Claims
for material damaged in shipment must be made by the purchaser against the transportation company at the time
the shipment is received.

Please record your equipment identification information below for future reference. This information can be found
on your machine nameplate.

Product _________________________________________________________________________________

Model Number ___________________________________________________________________________

Code Number or Date Code_________________________________________________________________

Serial Number____________________________________________________________________________

Date Purchased___________________________________________________________________________

Where Purchased_________________________________________________________________________

Whenever you request replacement parts or information on this equipment, always supply the information you
have recorded above. The code number is especially important when identifying the correct replacement parts.

On-Line

Product Registration

- Register your machine with Lincoln Electric either via fax or over the Internet.

• For faxing: Complete the form on the back of the warranty statement included in the literature packet
accompanying this machine and fax the form per the instructions printed on it.

• For On-Line Registration: Go to our

WEB SITE at www.lincolnelectric.com. Choose “Quick Links” and then

“Product Registration”. Please complete the form and submit your registration.

T

ABLE OF CONTENTS

Page

General Description ..................................................................................................... Section A

Installation .................................................................................................................... Section B

Connector Kit Installation to Gun Cable ............................................................................. B-1

K466-1 &-8 Installation ............................................................................................... B-1

K466-2 Installation ...................................................................................................... B-1

K466-3 Installation ...................................................................................................... B-1

K466-4 Installation ...................................................................................................... B-1

K466-5 Installation ...................................................................................................... B-2

K466-6, 7, 9 & 10 Installation ..................................................................................... B-2

Liner Installation ................................................................................................................. B-2

Contact Tip and Gas Nozzle Installation ............................................................................ B-3

Connection to Feeder ........................................................................................................ B-3

Connection to Lincoln Feeders ................................................................................... B-3

Connection to Tweco Adapted Feeders ...................................................................... B-3

Connection to Miller Feeders ...................................................................................... B-3

Connection to Hobart Feeders .................................................................................... B-4

Connection to L-Tec Adapted Feeders ....................................................................... B-4

Connection to Lincoln Wirematic, Hobart Series 2000 or SP100T Feeders .............. B-4

Connection to 10 Series Feeders ............................................................................... B-5

Operation ...................................................................................................................... Section C

Electrodes and Equipment ................................................................................................. C-1

Making a Weld ................................................................................................................... C-1

Avoiding Wire Feeding Problems ...................................................................................... C-1

Maintenance .................................................................................................................. Section D

Removal, Installation and Trimming Instructions for Magnum Liners ................................ D-1

Gun Tubes and Nozzles .................................................................................................... D-1

Gun Cables ........................................................................................................................ D-1

Cable Cleaning ........................................................................................................... D-1

Cable Repair (K470, K471 & K541 Models) ....................................................................... D-1

Gun Tube End Repair.................................................................................................. D-1

Wire Feeder End Repair.............................................................................................. D-3

Thread Sizes for 300 and 400 Amp Consumables.......................................................D-5

Troubleshooting ........................................................................................................... Section E

Parts Lists ......................................................................................................................... P202-C

vivi

MAGNUM 300 & 400

GENERAL DESCRIPTION

MAGNUM 300 & 400

A-1A-1

GENERAL DESCRIPTION

The Magnum™ 300 amp and 400 amp GMA gun and
cable assemblies have been designed to meet NEMA
specification EW3 for welding with steel electrode
using the GMAW (gas metal arc welding) and gas­shielded FCAW (flux-cored arc welding) processes.

Most models of Magnum 300 and 400 guns are not
factory equipped with a feeder end connector, except
K1802-1 and K2286-1, (they have a factory installed
feeder end connector). With the K466-1 Magnum
Connector Kit, they can be used with any Lincoln LN­7 or LN-25 semiautomatic wire feeder. The K466-1
should also be used with the LN-8 or LN-9 when feed­ing .052 and smaller electrodes. An optional K481
Magnum Fast-Connect Gas Tube Kit is available to
provide tool-less gas tube connection to Lincoln wire
feeders. Non-GMA model wire feeders require an
optional gas solenoid valve.

The 300 and 400 guns can also be used with any wire
feeder equipped with a Tweco® #1, 2, 3, 350 or 4 wire
feed adapter kit by using the K466-2 Magnum
Connector Kit.

With the K466-3 or K466-4 Magnum connector kits, it
is possible to connect Magnum 300 and 400 guns
directly to a variety of Miller and Hobart wire feeders,
respectively.

The K466-5 connector kit allows connection of
Magnum 300 and 400 guns to an L Tec feeder con­nector assembly. L-Tec feeders require a feeder con­nector assembly (similar to a Tweco® adapter) in order
to connect to a gun and cable. The K466-5 contains a
brass connector to permit Magnum guns to be con­nected to this feeder connector assembly.

The K466-6 connector kit allows connection of
Magnum 300 and 400 guns to a Lincoln Wirematic.

The K466-7 connector kit allows connection of
Magnum 300 and 400 guns to Hobart Series 2000
Wire Feeders.

The K466-8 connector kit allows connection of
Magnum 300 and 400 guns to an LN8 or LN9 when
1/16 and larger electrode is used.

The K466-9 connector kit allows connection of K497
to SP100T and related wire feeders.

The K466-10 connector kit allows connection of
Magnum 300 and 400 guns to a 10 Series wire feeder.

For best results when welding mild and alloy steels, it
is recommended that L-50 or L-56 Lincoln solid wire
electrodes be used for the GMAW process and OS70
or OS71 Lincoln Outershield cored electrodes for the
gas-shielded FCAW process.

• Do not touch electrically live parts
such as output terminals or inter­nal wiring

------------------------------------------------------------------------

WARNING

GENERAL DESCRIPTION

MAGNUM 300 & 400

A-2A-2

Description

Gun Contact Tips Gas
Product Cable Wire Size Standard Diffuser Gas Cable Gun Tube
Number Length (m) in. (mm) Duty Assembly Nozzle Insulator Liner 60°

K470-1 10 ft. .035 (0.9) KP2020-1B1

(3.0) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K470-7 12 ft. .035 (0.9) KP2020-1B1

(3.0) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K470-2 / 15 ft. .035 (0.9) KP2020-1B1
K1802-1

∆

(4.5) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K470-3 10 ft. .052 (1.3) KP2020-3B1

(3.0) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K470-8 12 ft. .052 (1.3) KP2020-3B1

(3.6) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K470-4 15 ft. .052 (1.3) KP2020-3B1

(4.5) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K470-5 10 ft. 1/16 (1.6) KP2020-4B1

(3.0) 5/64 (2.0) -5B1 KP2024-1 KP1932-1 KP2023-1 KP1933-3 KP1928-2

K470-9 12 ft. 1/16 (1.6) KP2020-4B1

(3.6) 5/64 (2.0) -5B1 KP2024-1 KP1932-1 KP2023-1 KP1933-3 KP1928-2

K470-6 15 ft. 1/16 (1.6) KP2020-4B1

(4.5) 5/64 (2.0) -5B1 KP2024-1 KP1932-1 KP2023-1 KP1933-3 KP1928-2

MAGNUM 300 (300 amperes) AT 60% DUTY CYCLE WITH CO2GAS*

* May also be used with other gases at reduced rating (up to 50%)

∆

K1802-1 Magnum 300 Gun has a factory installed feeder end connector.

GENERAL DESCRIPTION

MAGNUM 300 & 400

Description

Gun Contact Tips Gas
Product Cable Wire Size Standard Diffuser Gas Cable Gun Tube
Number Length (m) in. (mm) Duty Assembly Nozzle Insulator Liner 60°

K471-21 15 ft. .035 (0.9) KP2020-1B1

(4.5) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K471-22 15 ft. .052 (1.3) KP2020-3B1

(4.5) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K471-23 15 ft. 1/16 (1.6) KP2020-4B1

(4.5) 5/64 (2.0) -5B1 KP2024-1 KP1932-1 KP2023-1 KP1933-3 KP1928-2

MAGNUM 400 COMPLETE ASSEMBLY WITH TWECO CONNECTOR (400 amperes) AT 60% DUTY CYCLE WITH CO

2

GAS*

* May also be used with other gases at reduced rating (up to 50%)

A-3A-3

Description

Gun Contact Tips Gas
Product Cable Wire Size Standard Diffuser Gas Cable Gun Tube
Number Length (m) in. (mm) Duty Assembly Nozzle Insulator Liner 60°

K471-1 10 ft. .035 (0.9) KP2020-1B1

(3.0) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K471-7 12 ft. .035 (0.9) KP2020-1B1

(3.6) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K471-2/ 15 ft. .035 (0.9) KP2020-1B1
K2286-1

∆

(4.5) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K471-10 20 ft. .035 (0.9) KP2020-1B1

(6.1). 045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K471-13 25 ft. .035 (0.9) KP2020-1B1

(7.6) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K471-3 10 ft. .052 (1.3) KP2020-3B1

(3.0) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K471-8 12 ft. .052 (1.3) KP2020-3B1

(3.6) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K471-4 15 ft. .052 (1.3) KP2020-3B1

(4.5) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K471-11 20 ft. .052 (1.3) KP2020-3B1

(6.1) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K471-14 25 ft. .052 (1.3) KP2020-3B1

(7.6) 1/16 (1.6) -4B1 KP2024-1 KP1932-1 KP2023-1 KP1933-2 KP1928-2

K471-5 10 ft. 1/16 (1.6) KP2020-4B1

(3.0) 5/64 (2.0) -5B1 KP2024-1 KP1932-1 KP2023-1 KP1933-3 KP1928-2

K471-9 12 ft. 1/16 (1.6) KP2020-4B1

(3.6) 5/64 (2.0) -5B1 KP2024-1 KP2023-1 KP2023-1 KP1933-3 KP1928-2

K471-6 15 ft. 1/16 (1.6) KP2020-4B1

(4.5) 5/64 (2.0) -5B1 KP2024-1 KP2023-1 KP2023-1 KP1933-3 KP1928-2

K471-12 20 ft. 1/16 (1.6) KP2020-4B1

(6.1) 5/64 (2.0) -5B1 KP2024-1 KP1932-1 KP2023-1 KP1933-3 KP1928-2

K471-15 25 ft. 1/16 (1.6) KP2020-4B1

(7.6) 5/64 (2.0) -5B1 KP2024-1 KP1932-1 KP2023-1 KP1933-3 KP1928-2

MAGNUM 400 (400 amperes)AT 60% DUTY CYCLE WITH CO2GAS*

* May also be used with other gases at reduced rating (up to 50%)

∆

K2286-1 Magnum 400 Gun has a factory installed feeder end connector.

GENERAL DESCRIPTION

MAGNUM 300 & 400

Description

Gun Contact Tips Gas
Product Cable Wire Size Standard Diffuser Gas Cable Gun Tube
Number Length (m) in. (mm) Duty Assembly Nozzle Insulator Liner 60°

K541-1 10 ft. .035 (0.9) KP2020-1B1

(3.0) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K541-2 12 ft. .035 (0.9) KP2020-1B1

(3.6) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

K541-3 15 ft. .035 (0.9) KP2020-1B1

(4.5) .045 (1.2) -2B1 KP2024-1 KP1932-1 KP2023-1 KP1933-1 KP1928-2

MAGNUM 400 SHORT NECK (400 amperes at reduced duty cycle) 40% WITH CO2GAS*

* May also be used with other gases at reduced rating (up to 30%)

* May also be used with other gases at reduced rating (up to 30%)

Description

Gun Contact Tips Gas
Product Cable Wire Size Heavy Diffuser Gas Cable Gun Tube Feeder**
Number Length (m) in. (mm) Duty Assembly Nozzle Liner 60° Type

K541-21 15 ft. .035 (0.9) KP2021-1B1 Miller

(4.5) .045 (1.2) -2B1 KP2024-1 KP1930 -2 KP1933-1 KP1928-2 K466-3

K541-22 15 ft. .052 (1.3) KP2021-3B1 Miller

(4.5) 1/16 (1.6) -4B1 KP2024-1 KP1930 -2 KP1933-2 KP1928-2 K466-3

K541-23 15 ft. .035 (0.9) KP2021-1B1 Lincoln

(4.5) .045 (1.2) -2B1 KP2024-1 KP1930 -2 KP1933-1 KP1928-2 K466-1

K541-24 15 ft. .052 (1.3) KP2021-3B1 Lincoln

(4.5) 1/16 (1.6) -4B1 KP2024-1 KP1930 -2 KP1933-2 KP1928-2 K466-8

K541-25 15 ft. .035 (0.9) KP2021-1B1 Tweco

(4.5) .045 (1.2) -2B1 KP2024-1 KP1930 -2 KP1933-1 KP1928-2 K466-2

K541-26 15 ft. .052 (1.3) KP2021-3B1 Tweco

(4.5) 1/16 (1.6) -4B1 KP2024-1 KP1930 -2 KP1933-2 KP1928-2 K466-2

MAGNUM 400 SHORT NECK COMPLETE ASSEMBLY WITH FEEDER CONNECTOR (400 amperes) @ 40% WITH CO2GAS

*

** Feeder Kits installed on the gun at the factory.

A-4A-4

INSTALLATION

MAGNUM 300 & 400

Read this entire installation section before you
start installation.

SAFETY PRECAUTIONS

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.

------------------------------------------------------------------------

Only qualified personnel should install, use or
service this equipment

CONNECTOR KIT INSTALLATION TO GUN CABLE

Most models of Magnum 300 and Magnum 400 gun
cables, except K1802-1 and K2286-1, are shipped as
generic assemblies and must be assembled with a
K466 connector kit (See REPLACEMENT PARTS sec­tion Chart E for proper kit). The Magnum 400 Gun
K2286-1 has a factory installed feeder end connector.

K466-1& -8 INSTALLATION (For Lincoln Feeders)

a. Remove brass cable connector and insulation tube

(see Figure 1) from the K466-1 kit. Slide the insula­tion tube onto the connector from the threaded end
and screw it onto the feeder end of the gun cable.
Tighten the connection with the wrench provided.

b. Remove the molded gas plug fitting on the side of

the feeder end handle and replace it with the barbed
brass fitting provided in the kit. The included wrench
will fit both the gas plug and barbed fitting.

c. Attach the round connector of the gun control cable

provided to the trigger connector on the front of the
Lincoln feeder. (NOTE: Both the plug and socket
are keyed and must be properly oriented.)

d. Place one tubing clamp onto each end of the flexi-

ble tubing provided, approximately 2” (51 mm) in
from each end. Slide one end of the tubing onto the
barbed connector on the feeder end cable handle
(step b) and move the clamp down near the end of
the tube to ensure a good gas seal.

NOTE: An optional K481 Magnum Fast-Connect Gas
Tube Kit is available to provide tool-less gas tube con­nection to Lincoln wire feeders. Install per the instruc­tions sent with the kit.

K466-2 INSTALLATION (For Tweco Adapted Feeders)

a. Remove brass cable connector (see Figure 1) from

the K466-2 kit and screw it onto the feeder end of
the gun cable. Tighten the connection with the
wrench provided.

b. Check that the molded gas plug fitting is sealing the

gas fitting hole in the side of the feeder end handle.

K466-3 INSTALLATION (For Miller Feeders)

a. Remove brass cable connector (see Figure 1) from

the K466-3 kit and screw it onto the feeder end of
the gun cable. Tighten the connection with the
wrench provided.

b. Check that the molded gas plug fitting is sealing the

gas fitting hole in the side of the feeder end handle.

c. Attach the round connector of the gun control cable

provided to the trigger connector on the front of the
Miller feeder.

K466-4 INSTALLATION (For Hobart Feeders)

a. Remove brass cable connector (see Figure 1) from

the K466-4 kit and screw it onto the feeder end of
the gun cable. Tighten the connection with the
wrench provided.

b. Remove the molded gas plug fitting on the side of

the feeder end handle and replace it with the barbed
brass fitting provided in the kit. The included wrench
will fit both the gas plug and barbed fitting.

c. Attach the phone plug connector of the gun control

cable provided to the trigger connector on the front
of the Hobart feeder.

d. Place one tubing clamp onto each end of the flexi-

ble tubing provided, approximately 2” (51 mm) in
from each end. Slide one end of the tubing onto the
barbed connector on the feeder end cable handle
(step b) and move the clamp down near the end of
the tube to assure a good gas seal.

K466-5 INSTALLATION (For L-Tec Feeders)

a. Remove brass cable connector (see Figure 1) from

the K466-5 kit and screw it onto the feeder end of
the gun cable. Tighten the connection with the
wrench provided.

b. Check that the molded gas plug fitting is sealing the

gas fitting hole in the side of the feeder end handle.

WARNING

B-1B-1

INSTALLATION

MAGNUM 300 & 400

c. For L-Tec machines that require trigger lead con-

nections to be made at a terminal strip located with­in the machine (L-Tec 225), a gun control cable with
forked terminals is provided. Connect the terminat­ed leads to the terminal strip. For a machine that
requires a twist-lock gun control cable connection,
continue to use the L-Tec gun control cable provid­ed with the L-Tec wire feeder connector assembly.
Connect the twist-lock plug to the proper receptacle
on the machine.

K466-6, K466-7, K466-9 and K466-10 Installation

(Wirematic, Hobart Series 2000 Feeders, SP100T
Type and Lincoln 10 Series Feeders)

a. Remove brass cable connector (see Figure 1) from

the connector kit and screw it onto the feeder end of
the gun cable. Tighten the connection with the
wrench provided.

b. Check that the molded gas plug fitting is sealing the

gas fitting hole in the side of the feeder end handle.

c. Attach the gun control cable provided to the trigger

connector on the front of the wire feeder.

LINER INSTALLATION AND TRIMMING INSTRUCTIONS

Installation of (KP1932, KP1936 and KP1955 series
liners)

a. Lay the gun and cable straight on a flat surface.

b. Make sure that the set screw in the connector end

is backed out so as not to damage liner or liner

bushing. Remove and save the gas nozzle, nozzle
insulator, and gas diffuser from the end of the gun
tube assembly.

c. Insert a new untrimmed liner into the connector end

of the cable. Be sure the liner bushing is stenciled
appropriately for the wire size being used.

d. NOTE: For liners KP1950-7, KP1950-8, KP1955-1

and KP1955-2

Before fully seating the liner bushing, it will be nec­essary to trim the liner’s inner tube flush with the
liner bushing using a sharp blade. After trimming,
remove any burrs from inner tube and insure that
the opening is fully open.

For all K466 connector kits except K466-3 and
K466-4, tighten the set screw in the cable connec­tor.

or
For K466-3 and K466-4, screw in the connector cap
provided in the kit until it seats on the face of the
bushing. Then insert the appropriate piece of liner
material into the connector cap and tighten the set
screw. Three pieces of liner material are included in
these connector kits to help guide the electrode
through the connector cap. The piece with the
smallest inner diameter is designed for .045” (1.2
mm) maximum diameter electrode. The next largest
diameter is for 1/16” (1.6 mm) maximum diameter
electrode. The largest diameter piece of liner mate­rial is for 5/64” (2.0 mm) maximum diameter elec­trode.

e. Be sure the cable is straight and then trim the liner

to the length shown in Figure 1 (a gauge is includ­ed on the wrench provided with the connection kit
for gauging the cut-off length on 300 and 400 amp
gun tubes). Remove any burrs from the end of the
liner.

Figure 1

B-2B-2

INSTALLATION

f. Screw the gas diffuser onto the end of the gun tube

and tighten with the wrench provided.

g. Tighten the set screw in the side of the gas diffuser

against the cable liner using the Allen wrench pro­vided.

This screw should only be gently tightened.
Overtightening will split or collapse the liner and
cause poor wire feeding.

------------------------------------------------------------------------

h. Replace the nozzle insulator and gas nozzle.

INSTALLATION OF M18732 SERIES LINERS FOR
FEEDING ALUMINUM ELECTRODE

1. Lay the gun out straight on a flat surface and
remove the gas nozzle.

A. For all K466 except K466-3 and K466-4 connec-

tions, back out the set screw in the connector end
with a 5/64 (2.0 mm) Allen wrench.

B. For all K466-3 and K466-4 connections: Remove

the connector cap.

C. Back out the set screw in the diffuser for guns

that have a set screw in the diffuser.

2. Remove the liner and insert a new untrimmed liner
into the connector end of the cable. Check that the
coils of the spring liner can be seen through the
holes in the gas diffuser.

A. For all K466-3 and K466-4 connections: If the

liner is going to be replaced with a different size
liner, loosen the set screw on the connector cap
and replace the liner material with the correct
size.

3. Mark the liner 3/16" (5 mm) from the end of the liner
guide or connector. Pull the liner partially out and
cut off the liner at the mark using a sharp knife.

4. Screw the brass liner nipple onto the liner and fully
seat the liner busing into the liner guide or the con­nector.

A. For connector kits, except K466-3 and K466-4,

tighten the set screw in the cable connector.

B. For K466-3 and K466-4, screw in the connector

cap.

5. For guns with a diffuser set screw, tighten the set
screw in the side of the gas diffuser against the
cable liner using the Allen wrench provided.

This screw should only be gently tightened.
Overtightening will split or collapse the liner and
cause poor wire feeding.

------------------------------------------------------------------------

6. Replace the nozzle insulator and gas nozzle.

CONTACT TIP AND GAS NOZZLE INSTALLATION

a. Choose the correct size contact tip for the electrode

being used (wire size is stenciled on the side of the
contact tip) and screw it snugly into the gas diffuser.

b. Be sure the nozzle insulator is fully screwed onto

the gun tube and does not block the gas holes in the
diffuser. (NOTE: Insulator is not required when
using the optional fixed gas nozzles.)

c. Slip the appropriate gas nozzle onto the nozzle

insulator. Adjustable gas nozzles are available with
a .62” (15.9 mm) or .50” (12.7 mm) I.D., and in both
standard (flush) and recessed design. The proper
nozzle should be selected based on the welding
application. Different length fixed nozzles are also
available to fit 300 and 400 amp gun tubes to allow
either spray or short-circuiting transfer welding.

Choose the gas nozzle as appropriate for the
GMAW process to be used. Typically, the contact tip
end should be flush to .12” (3.1 mm) extended for
the short-circuiting transfer process and .12” (3.1
mm) recessed for spray transfer. For the
Outershield (FCAW) process, 1/8” (3 mm) recess is
recommended.

CAUTION

MAGNUM 300 & 400

CAUTION

B-3B-3

INSTALLATION

MAGNUM 300 & 400

CONNECTION TO FEEDER

CONNECTION TO LINCOLN FEEDERS

Gun cable assemblies which were assembled with a
K466-1 or -8 Connection Kit will connect easily to any
Lincoln LN-7, LN-8, LN-9, SP-200 or LN-25 feeder.

a. Check that the drive roll(s) and feeder guide tubes

are appropriate for the electrode size being used.

b. Fully push the brass connector end of the gun cable

into the conductor block on the outgoing side of the
feeder wire drive. Secure the cable using the hand
screw or set screw in the conductor block.

c. Insert the control cable plug from the feeder trigger

circuit into the mating socket on the feeder end
cable handle (See K466-1 Installation Section.)

d. Slide the free end of the flexible hose onto the

barbed gas fitting on the front of the Lincoln feeder
(See K466-1 or -8 Installation Section.) Move the
corresponding tubing clamp down near the end of
the tube to assure a good gas seal.

CONNECTION TO ADAPTED FEEDERS

Gun cable assemblies which were assembled with a
K466-2 Connection Kit will connect easily to any prop­erly adapted feeder.

a. Check that the adapter and feeder outgoing guide,

as well as the drive roll, are appropriate for the elec­trode size being used.

b. Fully push the brass connector end of the gun cable

into the brass adapter on the outgoing side of the
feeder wire drive. Secure the cable using the hand
screw or set screw in the adapter.

c. Insert the control cable plug from the feeder trigger

circuit into the mating socket on the gun cable con­nector handle .

CONNECTION TO MILLER FEEDERS

Gun and cable assemblies which were assembled with
a K466-3 Connector Kit will connect easily to a variety
of popular Miller wire feeders.

a. Check that the gun liner, connector cap liner, drive

rolls and guide tubes are appropriate for the elec­trode size being used.

b. Fully push the brass connector end of the gun and

cable into the connector receptacle on the outgoing
side of the feeder wire drive. Tighten the hand
screw to clamp down on the connector.

c. Insert the control cable plug from the feeder trigger

circuit into the mating socket on the gun cable con­nector handle.

CONNECTION TO HOBART FEEDERS

Gun and cable assemblies which were assembled with
a K466-4 Connector Kit will connect easily to a variety
of Hobart wire feeders.

a. Check that the gun liner, connector cap liner, drive

rolls and guide tubes are appropriate for the elec­trode size being used.

b. Fully push the brass connector end of the gun and

cable into the connector receptacle on the outgoing
side of the feeder wire drive. Tighten the hand
screw to clamp down on the connector.

c. Insert the control cable plug from the feeder trigger

circuit into the mating socket on the gun cable con­nector handle.

d. Slide the free end of the flexible hose (mounted to

the gun in K466-4 Installation Section) onto the gas
fitting on the Hobart wire feeder. Move the corre­sponding tubing clamp down near the end of the
tube to assure a good gas seal.

CONNECTION TO L-TEC ADAPTED FEEDERS

Gun and cable assemblies which were assembled with
a K466-5 connection kit will connect easily to an L-Tec
feeder equipped with an L-Tec feeder connector
assembly. L-Tec feeders require this connector assem­bly (similar to a Tweco adapter) to connect with a gun
and cable.

a. Check that the adapter and feeder outgoing guide

as well as the drive roll, are appropriate for the elec­trode size being used.

b. Fully push the brass connector end of the gun cable

into the brass adapter on the outgoing side of the
feeder wire drive. Secure the cable using the hand
screw, set screw, or pin.

B-4B-4

INSTALLATION

c. Insert the control cable plug from the feeder trigger

circuit into the mating socket on the gun cable con­nector handle. For machines with a twist-lock trig­ger lead receptacle, if the L-Tec gun control cable
does not easily connect with the socket, the gun
control cable that came with the K466-5 kit can be
used. To do this, cut off the gun control leads as
close to the forked terminals as possible and skin
back the leads 7/16” (11 mm). Remove the twist­lock plug from the L-Tec control cable and connect
it to the K466-5 cable. Make sure the outer jacket of
the connector is caught within the plug’s strain
relief.

CONNECTION TO LINCOLN WIREMATIC, HOBART
SERIES 2000 FEEDERS, OR SP100T TYPE FEEDERS.

Gun cable asssemblies which were assembled with a
K466-6, K466-7 or K466-9 Connection Kit will connect
easily to a feeder.

a. Check that the adapter and feeder outgoing guide,

as well as the drive roll, are appropriate for the elec­trode size being used.

b. Fully push the brass connector end of the gun cable

into the outgoing side of the feeder wire drive.
Secure the cable using the hand screw on the wire
feeder.

c. Insert the control cable plug from the feeder trigger

circuit into the mating socket on the gun cable con­nector handle.

CONNECTION TO LINCOLN 10 SERIES FEEDERS

Gun cable assemblies which were assembled with a
K466-10 Connection Kit or K471-21 thru -23 gun and
cable assemblies will connect easily to a 10 Series
feeder.

a. Check that the K1500-2 gun adapter is in place on

the wire feeder. Check that the feeder guide tubes,
as well as the drive roll(s), are appropriate for the
electrode size being used.

b. Fully push the brass connector end of the gun cable

into the gun adapter on the outgoing side of the
feeder wire drive and secure the cable using the
hand screw.

c. Insert the control cable plug from the feeder trigger

circuit into the mating socket on the gun cable con­nector handle.

MAGNUM 300 & 400

B-5B-5

OPERATION

ELECTRODES AND EQUIPMENT

The Magnum 300 and Magnum 400 guns and cables
have been designed for use with Lincoln L-50 and
L-56, solid steel wire electrodes for the GMAW
process and Lincoln Outershield cored electrodes for
the gas-shielded FCAW process. Refer to the appro­priate Lincoln Process and Procedure Guidelines for
the electrode used for information on recommended
electrical and visible stickouts.

MAKING A WELD

Do not attempt to use this equipment until you
have thoroughly read all operating and mainte­nance manuals supplied with your machine. They
include important safety precautions, detailed
engine starting, operating and maintenance
instructions and parts lists.

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.

------------------------------------------------------------------------

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.

------------------------------------------------------------------------

ARC RAYS can burn.

• Wear eye, ear and body protection.

------------------------------------------------------------------------

Only qualified personnel should operate this
equipment.

a. Check that the welding power source is on and that

the shielding gas supply is set for the proper flow
rate.

b. Position electrode over joint. End of the electrode

should be slightly off the work.

c. Lower welding helmet. close gun trigger and begin

welding. Hold the gun so the contact tip to work
distance gives the correct electrical stickout as
required for the procedure being used.

d. To stop welding, release the gun trigger and then

pull the gun away from the work after the arc goes
out. Follow wire feeder instruction manual if using a
trigger interlock circuit.

e. If the optional interlocking trigger is installed.

-With the trigger pulled in all the way, the trigger
can be slid forward into the interlock position.

-To release the interlock, squeeze the trigger and
pull back.

AVOIDING WIRE FEEDING PROBLEMS

Wire feeding problems can be avoided by observing
the following gun handling procedures:

a. Do not kink or pull cable around sharp corners.

b. Keep the electrode cable as straight as possible

when welding or loading electrode through cable.

c. Avoid wrapping excess cable around handle or

front of wire feeder especially on longer 20 and 25
ft (6.1 and 7.6 mm) length guns.

d. Do not allow dolly wheels or trucks to run over

cables.

e. Keep cable clean by following maintenance

instructions.

f. Use only clean, rust-free electrode. The Lincoln

electrodes have proper surface lubrication.

g. Replace contact tip when the arc starts to become

unstable or the contact tip end is fused or
deformed.

MAGNUM 300 & 400

WARNING

C-1C-1

MAINTENANCE

REMOVAL, INSTALLATION AND TRIMMING
INSTRUCTIONS FOR MAGNUM LINERS

NOTE: The variation in cable lengths prevents the

interchangeability of liners. Once a liner has been cut
for a particular gun, it should not be installed in anoth­er gun, unless it can meet the liner cut off length
requirement. Liners are shipped with the jacket of the
liner extended the proper amount.

a. Remove the gas nozzle and nozzle insulator.

Loosen the set screw located in the side of the dif­fuser with 5/64 (2.0 mm) Allen wrench (provided
with the gun or connector kit).

b. Remove the gas diffuser from gun.

c. Lay gun and cable out straight on a flat surface. For

all K466 except K466-3 and K466-4 Connections:

Loosen set screw located in the brass cable con­nector at the wire feeder end of the cable using the
same 5/64 (2.0 mm) Allen wrench. Pull liner out of
cable. (REFER TO FIGURE 1 IN INSTALLATION
FOR EACH)

<OR>

For K466-3 and K466-4 CONNECTIONS:

Remove the connector cap with the wrench provid­ed. Pull liner out of cable. If the liner is going to be
replaced with a different size liner, loosen set screw
on the connector cap and remove piece of liner
material.

d. For installation and trimming instructions for

Magnum liners see “LINER INSTALLATION” in
INSTALLATION section.

GUN TUBES AND NOZZLES

a. Replace worn contact tips as required.

b. Remove spatter from inside of gas nozzle and from

tip after each 10 minutes of arc time or as required.

c. To remove gun tube from gun, loosen socket-head

clamping screw in handle with 3/16” (4.8 mm) Allen
wrench. Remove gas nozzle and nozzle insulator
and also loosen small set screw in the diffuser
using 5/64” (2.0 mm) Allen wrench.

NOTE: Small set screw in the diffuser must be
loosened, otherwise liner could be damaged when
attempting to remove gun tube.

Pull gun tube out from gun handle. To reinstall,
insert the gun tube, push in as far as possible and
retighten screws.

GUN CABLES

CABLE CLEANING

Clean cable liner after using approximately 300
pounds (136 kg) of electrode. Remove the cable from
the wire feeder and lay it out straight on the floor.
Remove the contact tip from the gun. Using an air
hose and only partial pressure, gently blow out the
cable liner from the gas diffuser end.

Excessive pressure at the start may 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.

CABLE REPAIR (ALL K470, K471 & K541
MODELS)

The Magnum 300 and Magnum 400 guns feature the
use of repairable cable connectors. If the cable ever
gets severely damaged. it may be cut shorter and
repaired by the user. Repair cables as follows:

GUN TUBE END REPAIR (Requires 2 S19492-2
Terminals)

a. Remove the cable liner per Removal, Installation

and Trimming Instructions.

b. Remove the gun tube per Gun Tubes and Nozzles

Section.

c. Remove three #6 screws from the gun handle, sep-

arate the two halves, and remove the cable from
the handle along with the trigger assembly.

d. Remove gun tube connector from cable by

unscrewing connector nut from gun tube connec­tor. If the cable inner tube is difficult to remove from
the connector assembly, carefully slit it lengthwise
with a knife up to the brass connector.

MAGNUM 300 & 400

CAUTION

D-1D-1

MAINTENANCE

e. Uncouple the strain relief by pushing its outer

housing toward the middle of the cable. Move the
strain relief and the cable boot toward the middle of
the cable, past the damaged section.

f. Cut off the damaged section of cable and strip off

the outer jacket as shown in Figure 2. Be careful
not to cut the insulation on the control wires while
stripping jacket. Strip the red and white control
leads 1/4 inch (6.4 mm) from the end and crimp a
new S19492-2 terminal to each lead.

NOTE: The cable contains three control leads. Any
two control leads can be used, provided the two
colors used are the same at both ends. The extra
lead is a spare that can be used if one of the other
leads breaks.

g. Check that the cable boot and both halves of the

strain relief are on the cable. Slip the connector nut

over the copper strands with the thread end out.
Orient gun tube connector so machined flat is on
the same side of the cable as the red and white
control leads. Assemble gun tube connector to
cable by forcing the steel tube of the connector into
the inside diameter of the cable inner tube until the
copper strands are butted against the gun tube
connector shoulder. Keeping the copper strands
against the shoulder, pull the connector nut over
the copper strands, engage the gun tube connec­tor threads, and tighten in place. Refer to Figure 3.

NOTE: For best results, insert a .219”/.240” (5.6/

6.1 mm) diameter rod through the connector and

into core of cable approximately 5.00 (127 mm)
when pushing the connector tube into the cable
core tube. To tighten, hold the connector in place
while turning the nut, then remove the rod from the
core. This procedure ensures the inner core does
not kink while assembling or tightening.

MAGNUM 300 & 400

CABLE

CONTROL LEAD

INNER TUBE

COPPER STRANDING

CONTROL LEAD

1.65 (41.9 mm)
SKIN

.25" (6.4 mm) SKIN *

(BOTH CONTROL LEADS)

Figure 2

Figure 3

D-2D-2

MAINTENANCE

h. Pull the cut-off lead terminals off the trigger assem-

bly and connect the replacement control lead ter­minals.

j. Position the cable boot and strain relief on the

cable so it fits in cable handle cavity and lock the
strain relief in place by pushing the two halves
together.

k. Assemble cable in left side of gun handle.

Assemble trigger into the proper handle cavity.
Assemble right side of gun handle and tighten the
three screws that hold the handle together. Refer to
Figure 4.

l. Install gun tube per Gun Tubes and Nozzles

Section.

m. Install and trim liner per Liner Installation Section.

WIRE FEEDER END REPAIR (Requires 2 S19492-1
Terminals)

a. Remove the cable liner per Removal, Installation,

and Trimming Instruction.

b. Remove the feeder end connector, molded gas

plug (or barbed fitting), cable handle nut, plastic

tailpiece and connector cover (see Figure 5).

NOTE: In order to remove the cable handle nut, the
tail of the connector cover must be depressed and
the cable handle nut rotated 1/4 turn counterclock­wise as viewed from the feeder end.

c. Remove incoming connector from cable by

unscrewing connector nut from incoming connec­tor. If the cable inner tube is difficult to remove from
the connector assembly, carefully slit it lengthwise
with a knife up to the brass connector.

d. Move the cable boot and cable handle toward the

middle of the cable past the damaged section.

e. Cut off the damaged section of cable and strip off

the outer jacket as shown in Figure 2. Be careful
not to cut the insulation on the control wires while
stripping jacket. Strip the red and white control
leads 1/4 inch (6.4 mm) from the end and crimp a
new S19492-1 terminal to each lead.

NOTE: The cable contains three control leads. Any
two control leads can be used, provided the two
colors used are the same at both ends. The extra
lead is a spare that can be used if one of the other
leads breaks.

MAGNUM 300 & 400

Figure 4

D-3D-3

MAINTENANCE

f. Check that the cable boot and cable handle are on

the cable. Slip the connector nut over the copper
strands with the threaded end out. Assemble
incoming connector to cable by forcing the steel
tube of the connector into the inside diameter of
the cable inner tube until the copper strands are
butted against the incoming connector shoulder.
Keeping the copper strands against the shoulder,
pull the connector nut over the copper strands,
engage the incoming connector threads, and tight­en in place. Refer to Figure 3.

NOTE: For best results, insert a .219"/.240"
(5.6/6.1 mm) diameter rod through the connector
and into core of cable approximately 5.00” (127
mm) when pushing the connector tube into the
cable core tube. To tighten, hold the connector in
place while turning the nut. then remove the rod
from the core. This procedure ensures the inner
core does not kink while assembling or tightening.

Position the plastic strain relief such that the
tapered end is 4.68 (119 mm) from the incoming
connector (see Figure 5). Lock into place with steel
housing. Plastic strain relief may overhang cable
jacket a maximum of .43" (11 mm).

g. Position cable boot and cable handle on cable and

assemble replacement control wire terminals in
place on the cable handle. Insert connector cover
in place. Install tailpiece and fasten to cable handle
with cable handle nut. Refer to Figure 5.

h. Replace the molded gas plug (or barbed fitting) and

feeder end connector.

j. Install and trim liner per Liner Installation Section.

MAGNUM 300 & 400

4.68

(119 mm)

.43 (11 mm)
MAX.

FEEDER END
CONNECTOR

PRESS HERE TO
REMOVE THE CABLE
HANDLE NUT

GAS PLUG
OR FITTING

CONNECTOR COVER

CABLE BOOT

CABLE

CABLE HANDLE

STRAIN RELIEF HOUSING

STRAIN RELIEF

INCOMING
CONNECTOR

TAIL PIECE

C

A

B

L

E

H

A

N

D

L

E

N

U

T

Figure 5

D-4D-4

MAINTENANCE

MAGNUM 300 & 400

THREAD SIZES FOR MAGNUM 300 & 400 CONSUMABLES

D-5D-5

TROUBLESHOOTING

MAGNUM 300 & 400

Observe all Safety Guidelines detailed throughout this manual

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local

Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

CAUTION

PROBLEMS

PROBLEMS

(SYMPTOMS)

POSSIBLE CAUSE REMEDY

Drive rolls turn, but wire will not
feed or wire feeding is rough.

Variable or “hunting” arc.

a. Gun cable kinked and/or twisted.

b. Wire jammed in gun and cable.

c. Incorrect drive rolls and guide

tubes.

d. Gun cable liner dirty.

e. Worn drive rolls.

f. Electrode rusty and/or dirty.

g. Worn or improper size cable liner.

h. Partially flashed, melted or

improper size contact tip.

a. Contact tip worn or incorrect size.

b. Worn or undersize work cables or

poor ground connections.

c. Loose electrode connections.

a. Keep as straight as possible.

Inspect cable and replace if
necessary.

b. Remove wire from gun and cable

– feed in new wire. Note any
obstruction. Replace liner if
necessary.

c. Be sure the wire diameter being

used is stamped on drive rolls
and guide tubes. Replace if
necessary.

d. Clean liner or replace.

e. Replace or reverse split drive roll

type.

f. Replace the electrode if it is

rusty.

g. Replace cable liner.

h. Replace the contact tip.

a. Replace contact tip.

b. Inspect – repair or replace as

necessary.

c. Be sure the following connections

are tight: electrode cable to wire
feeder and power source, work
cable to power source and work,
gun cable to wire feeder contact
block, gun nozzle to body and
contact tip to nozzle.

E-1E-1

TROUBLESHOOTING

MAGNUM 300 & 400

Observe all Safety Guidelines detailed throughout this manual

If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local

Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed.

CAUTION

PROBLEMS

PROBLEMS

(SYMPTOMS)

POSSIBLE CAUSE REMEDY

Poor arc striking with sticking or
“blast-offs”, weld porosity, narrow
and ropy looking bead, or electrode
stubbing into plate while welding.

Tip seizes in diffuser.

a. Improper procedures or

techniques.

b. Improper gas shielding.

a. Tip overheating due to prolonged

or excessive high current and/or
duty cycle welding.

a. See “Gas Metal Arc Welding

Guide” (GS100).

b. Clean gas cone. Make certain

that gas diffuser is not restricted.
Make certain that gas cylinder is
not empty or turned off. Make
certain gas solenoid valve is
operating and gas flow rate is
proper.

Remove gun liner and check
rubber seal for any sign of
deterioration or damage. Be sure
set screw in brass connector is in
place and tightened against the
liner bushing.

a. Do not exceed current and duty

cycle rating of gun.

A light application of high
temperature antiseize lubricant
(such as Lincoln E2067 Graphite
Grease) may be applied to tip
threads.

E-2E-2

NOTES

MAGNUM 300 & 400

NOTES

MAGNUM 300 & 400

WARNING

AVISO DE

PRECAUCION

ATTENTION

WARNUNG

ATENÇÃO

Spanish

French

German

Portuguese

Japanese

Chinese

Korean

Arabic

READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO
BE USED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES.

SE RECOMIENDA LEER Y ENTENDER LAS INSTRUCCIONES DEL FABRICANTE PARA EL USO DE ESTE EQUIPO Y LOS
CONSUMIBLES QUE VA A UTILIZAR, SIGA LAS MEDIDAS DE SEGURIDAD DE SU SUPERVISOR.

LISEZ ET COMPRENEZ LES INSTRUCTIONS DU FABRICANT EN CE QUI REGARDE CET EQUIPMENT ET LES PRODUITS A
ETRE EMPLOYES ET SUIVEZ LES PROCEDURES DE SECURITE DE VOTRE EMPLOYEUR.

LESEN SIE UND BEFOLGEN SIE DIE BETRIEBSANLEITUNG DER ANLAGE UND DEN ELEKTRODENEINSATZ DES HER­STELLERS. DIE UNFALLVERHÜTUNGSVORSCHRIFTEN DES ARBEITGEBERS SIND EBENFALLS ZU BEACHTEN.

● Do not touch electrically live parts or

electrode with skin or wet clothing.

● Insulate yourself from work and

ground.

● No toque las partes o los electrodos

bajo carga con la piel o ropa moja­da.

● Aislese del trabajo y de la tierra.

● Ne laissez ni la peau ni des vête-

ments mouillés entrer en contact
avec des pièces sous tension.

● Isolez-vous du travail et de la terre.

● Berühren Sie keine stromführenden

Teile oder Elektroden mit Ihrem
Körper oder feuchter Kleidung!

● Isolieren Sie sich von den

Elektroden und dem Erdboden!

● Não toque partes elétricas e elec-

trodos com a pele ou roupa molha­da.

● Isole-se da peça e terra.

● Keep flammable materials away.

● Mantenga el material combustible

fuera del área de trabajo.

● Gardez à l’écart de tout matériel

inflammable.

● Entfernen Sie brennbarres Material!

● Mantenha inflamáveis bem guarda-

dos.

● Wear eye, ear and body protection.

● Protéjase los ojos, los oídos y el

cuerpo.

● Protégez vos yeux, vos oreilles et

votre corps.

● Tragen Sie Augen-, Ohren- und Kör-

perschutz!

● Use proteção para a vista, ouvido e

corpo.

WARNING

AVISO DE

PRECAUCION

ATTENTION

WARNUNG

ATENÇÃO

Spanish

French

German

Portuguese

Japanese

Chinese

Korean

Arabic

LEIA E COMPREENDA AS INSTRUÇÕES DO FABRICANTE PARA ESTE EQUIPAMENTO E AS PARTES DE USO, E SIGA AS
PRÁTICAS DE SEGURANÇA DO EMPREGADOR.

● Keep your head out of fumes.

● Use ventilation or exhaust to

remove fumes from breathing zone.

● Los humos fuera de la zona de res-

piración.

● Mantenga la cabeza fuera de los

humos. Utilice ventilación o
aspiración para gases.

● Gardez la tête à l’écart des fumées.

● Utilisez un ventilateur ou un aspira-

teur pour ôter les fumées des zones
de travail.

● Vermeiden Sie das Einatmen von

Schweibrauch!

● Sorgen Sie für gute Be- und

Entlüftung des Arbeitsplatzes!

● Mantenha seu rosto da fumaça.

● Use ventilação e exhaustão para

remover fumo da zona respiratória.

● Turn power off before servicing.

● Desconectar el cable de ali-

mentación de poder de la máquina
antes de iniciar cualquier servicio.

● Débranchez le courant avant l’entre-

tien.

● Strom vor Wartungsarbeiten

abschalten! (Netzstrom völlig öff­nen; Maschine anhalten!)

● Não opere com as tampas removidas.

● Desligue a corrente antes de fazer

serviço.

● Não toque as partes elétricas nuas.

● Do not operate with panel open or

guards off.

● No operar con panel abierto o

guardas quitadas.

● N’opérez pas avec les panneaux

ouverts ou avec les dispositifs de
protection enlevés.

● Anlage nie ohne Schutzgehäuse

oder Innenschutzverkleidung in
Betrieb setzen!

● Mantenha-se afastado das partes

moventes.

● Não opere com os paineis abertos

ou guardas removidas.

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