Shown with Classic Cup
®
Cobra MX
Owner’s Manual
Product: Cobra MX
Manual: 091-0595
Serial: 07020001
Voltage Rating: 24 VDC
Revision: Feb 2007 Rev. A
Gun models: 237-XXX L/C 1/4"
238-XXX L/C 3/8"
242-XXX A/C 1/4"
243-XXX A/C 3/8"
Shown with MAX Cup
225 Ampere Liquid Cooled, 1/4" tip
250 Ampere Liquid Cooled, 3/8" tip
175 Ampere Air Cooled, 1/4" tip
200 Ampere Air Cooled, 3/8" tip
P u s h - P u l l W e l d i n g G u n s
Table of Contents
Safety Considerations ........................................................................i-iii
Installation ............................................................................... Section A
Technical Specications .....................................................................................1
Support Equipment Required .............................................................................1
Coolant Recommendations ................................................................................1
Gun Lead Connections ......................................................................................1
Operation .................................................................................Section B
General ..............................................................................................................2
Controls and Settings .........................................................................................2
Trigger Adjustment .............................................................................................2
Drive Roll and Idler Rolls....................................................................................3
Accessories .............................................................................Section C
Optional Kits .......................................................................................................4
Conduits .............................................................................................................4
Snake Skins ....................................................................................................... 4
Contact Tips .......................................................................................................5
Gas Cups ........................................................................................................... 6
Maintenance ............................................................................Section D
Periodic Maintenance.........................................................................................6
Recommended Spare Parts List ........................................................................ 7
Troubleshooting .......................................................................Section E
Troubleshooting Guide .......................................................................................9
Testing The Gun .................................................................................................9
Appendices ..............................................................................Section F
Diagrams / Parts List ........................................................................................ 11
Mechanical .......................................................................................................12
Electrical...........................................................................................................23
Safety Warnings
Warranty
Declaration of Conformity for
European Community (CE) Products
Note
Manufacturer’s Name: MK Products, Inc.
16882 Armstrong Ave.
Irvine, CA 92606
This information is provided for units with CE certication (see rating label on unit).
Declares that the product: Python
conforms to the following Directives and Standards:
Electromagnetic Compatibility (EMC) Directive: 89/336/EEC
Arc Welding Equipment Part I: Welding Power Sources: IEC 60974-1
Arc Welding Equipment: Wirefeed Systems: IEC 974-5
Degrees of Protection Provided by Enclosures (IP Code): IEC 529:1989
Cobra® MX
Low Voltage Directive: 73/23/EEC
(September 1998 - Second Edition)
(September 1997 - Draft Revision)
(November 1989 - First Edition)
®
Directives
Standards
Insulation Coordination For Equipment With Low-Voltage Systems:
Part I: Principles, Requirements and Tests: IEC 664-1: 1992
(October 1992 - First Edition)
Electromagnetic Compatibility, (EMC): EN 50199
(August 1995)
Torches And Guns For Arc Welding, EN 50078
SAFETY CONSIDERATIONS
ELECTRIC ARC WELDING EQUIPMENT
CAUTION : READ BEFORE ATTEMPTING INSTALLATION, OPERATION
OR MAINTENANCE OF THIS EQUIPMENT
1-1 INTRODUCTION
This equipment is intended for ultimate
app licat ion b y c ommer cial/ indus trial
users an d for operation by person s
trained and experienced in the use and
mainte nance of welding equipme nt.
Operation should not be undertaken
without adequate training in the use of
such equipment. Training is available
from many public and private schools or
similar facilities.
Sa fe pr act ice s i n t h e in s ta l lat ion ,
operation a nd m ai nt en an ce o f this
equipment requires proper training in the
art, a careful study of the information
provided with the equipment, and the
use of common sense. Rules for safe
use are generally provided by suppliers
of welding power sources, compressed
gas suppliers, and electrode suppliers.
Careful compliance with these rules will
promote safe use of this equipment.
The following Safety Rules cover some
of the more generally found situations.
READ THEM CAREFULLY. In case of
any doubt, obtain qualied help before
proceeding.
1-2 GENERAL PRECAUTIONS
A. Burn Prevention
ELECTRIC ARC WELDING PRODUCES
H I G H I N T EN SI TY H E A T AN D
ULTR AVI OLET R ADIAN T ENE RGY
WHICH MAY CAUSE SERIOUS AND
PE RM ANE NT E YE DA MA GE A ND
WHICH MAY DAMAGE ANY EXPOSED
SKIN AREAS.
Wear helmet with safety g oggles or
glasses with side shields underneath,
ap pr o pr iat e f il t er l ens es or p lat es
(protected by clear cover glass). This
is a must for welding or cutting (and
chipping) to protect the eyes from radiant
energy and ying metal. Replace cover
glass when broken, pitted, or spattered.
Medical rst aid and eye treatment. First
aid facilities and a qualied rst aid
person should be available for each shift
unless medical facilities are close by for
immediate treatment of ash burns of
the eyes and skin burns.
Wear protective clothing - leather (or
asbestos) gauntlet gloves, hat, and high
safety-toe shoes. Button shirt collar and
pocket aps, and wear cufess trousers
to avoid entry of sparks and slag.
Avoid oily or greasy clothing. A spark
may ignite them.
Flammable h air preparations should
not be used by persons intending to
weld or cut.
Hot metal such as electrode stubs and
work pieces should never be handled
without gloves.
Ear plugs should be worn when working
on overhead or in a conned space. A
hard hat should be worn when others
work overhead.
B. Toxic Fume Prevention
WARNING: The use of this product may
result in exposure to chemicals known
to the State of California to cause cancer
and birth defects or other reproductive
harm.
Adequate ventilation. Severe discomfort,
illness or death can result from fumes,
vapors, heat, or oxygen enrichment or
depletion that welding (or cutting) may
produce. Prevent them with adequate
vent il at ion. NE VER ven ti la te w ith
oxygen.
Le ad -, ca dm ium -, z i nc -, merc ury -,
beryllium-bearing and similar materials,
whe n wel de d or cut , may p roduce
harmful concentrations of toxic fumes.
Adequate local exhaust ventilation must
be used, or each person in the area,
as well as the operator, must wear an
air-supplied respirator. For beryllium,
both must be used.
Me t als co a te d wi t h or con t ain i ng
materials that emit toxic fumes should
not be heated unless coating is removed
form the work surface, the area is well
ventilated, or the operator wears an
air-supplied respirator.
Work in a conned space only while it is
being ventilated and, if necessary, while
wearing an air-supplied respirator.
Gas leaks in a conned space should be
avoided. Leaked gas in large quantities
ca n c ha n ge oxyg en co nce ntr ati on
dangerously. Do not bring gas cylinders
into a conned space.
Lea vi ng confined s pa ce, s hu t O FF
ga s su p ply at s our c e to pr e v ent
possible accumulation of gases in the
space if downstream valves have been
accidentally opened or left open. Check
to be sure that the space is safe before
reentering it.
Vapors from chlorinated solvents can
be decomposed by the heat of the arc
(or ame) to form PHOSGENE, a highly
toxic gas, and other lung and eye irritating
products. The u lt ra vi ol et ( ra di an t)
energy of the arc can also decompose
trichloroethylene and perchloroethylene
vapors to form phosgene. DO NOT
WELD or cut where solvent vapors can
be drawn into the welding or cutting
atmosphere or where the radiant energy
can penetrate to atmospheres containing
even minute amounts of trichloroethylene
or perchloroethylene.
C. Fire and Explosion Prevention
Caus es o f fire a nd e xp losio n are:
combustibles reached by the arc, ame,
fl yi ng spar ks , h ot s lag , or h eat ed
material, misuse of compressed gases
and cylinders, and short circuits.
BE AWARE THAT ying sparks or falling
slag can pass through cracks, along
pipes, through windows or doors, and
through wall or oor openings, out of
sight of the goggled operator. Sparks
can y many feet.
To prevent res and explosion:
Keep equipment clean and operable,
free of oil, grease, and (in electrical
parts) of metallic particles that can cause
short circuits.
If combustibles are in area, do NOT weld
or cut. Move the work if practicable,
to an area free of combustibles. Avoid
paint spray rooms, dip tanks, storage
areas, ventilators. If the work cannot
be moved, move combustibles at least
35 feet away, out of reach of sparks
and heat; or protect against ignition with
suitable and snug-tting, re-resistant
covers or shields.
Walls touching combustibles on opposite
sides should not be welded on (or cut).
Walls, ceilings, and flo or near w ork
should be protected by heat-resistant
covers or shields.
Fire watcher must be standing by with
suitable re extinguishing equipment
during and for some time after welding
or cutting if:
1. Appreciable combustibles (including
buildi ng cons truction) a re within 35
feet.
2. Appreciable combustibles are further
than 35 feet, but can be ignited by
sparks.
3. Openings (concealed or visible) in
oors or walls within 35 feet may expose
combustibles to sparks.
4. Com bu st ibles a dj acent t o w al ls ,
ceilings, roofs, or metal partitions can be
ignited by radiant or conducted heat.
Hot work permit should be obtained
before operation to ensure supervisor’s
approval that adequate precautions have
been taken.
After work is done, check that area is
free of sparks, glowing embers, and
ames.
An em p t y c on t a in e r t h a t he l d
combustibles , or tha t can produce
ammable or toxic vapors when heated,
must never be welded on or cut, unless
container has first been cleaned in
accordance with industry standards.
This in cludes: a thorou gh s tea m or
caustic cleaning (or a solvent of water
washing, depending on the combustible’s
solubility) , f ollow ed by purg ing and
inerting with nitrogen or carbon dioxide,
and using protective equipment.
Water-lling just below working level may
substitute for inerting.
A conta iner w ith u nknow n c onten ts
sho ul d be cle an ed ( see p ar ag ra ph
above). Do NOT depend on sense of
smell or sight to determine if it is safe
to weld or cut.
Hollow castings or containers must be
vented before welding or cutting. They
can explode.
Explosive atmospheres. NEVER weld or
cut where the air may contain ammable
dust, gas, or liquid vapors (such as
gasoline).
D. Compressed Gas Equipment
The safe handling of compressed gas
equ ip ment is d etailed i n n um erous
indus try p ublications. The following
Cobra® MX Owner's Manual Page i
general rules cover many of the most
common situations.
1. Pressure Regulators
Regul ato r r eli ef val ve is d esi gne d
to pr ote ct onl y t he regu lat or fro m
overpressure; it is not intended to protect
any downstream equipment. Provide
such protection with one or more relief
devices.
Never connect a regulator to a cylinder
containing gas other than that for which
the regulator was designed.
Remove faulty regulator from service
immediately for repair (rst close cylinder
valve). The following symptoms indicate
a faulty regulator:
Leaks - if gas leaks externally.
Excessive Creep - if delivery pressure
continues to rise with downstream valve
closed.
Faulty Gauge - if gauge pointer does
not move off stop pin when pressurized,
nor returns to stop pin after pressure
release.
Repair. Do NOT attempt repair. Send
fa u lt y r e g u l a t o r s f o r r e p a i r t o
manufacturer’s designated repair center,
where special techniques and tools are
used by trained personnel.
2. Cylinders
Cylinders must be handled carefully to
prevent leaks and damage to their walls,
valves, or safety devices:
Avoid electrical cir cu it contact with
cylinders including third rails, electrical
wires, or welding circuits. They can
produced short circuit arcs that may lead
to a serious accident. (See 1-3C)
ICC or DOT marking must be on each
cylinder. It is an assurance of safety
when the cylinder is properly handled.
Id e ntif y ing g as c o nten t . Us e onl y
cylinders with name of gas marked on
them; do not rely on color to identify gas
content. Notify supplier if unmarked.
NEVER DEFACE or alter name, number,
or other markings on a cylinder. It is
illegal and hazardous.
Empties: Keep valves closed, replace
caps securely; mark MT; keep them
se para t e f r om F ULLS , an d ret u rn
promptly.
Prohibited use. Never use a cylinder or its
contents for other than its intended use,
NEVER as a support or roller.
Locate o r secure cylinders so they
cannot be knocked over.
Passageways and work areas. Keep
cylinders clear of areas where they may
be stuck.
Transporting cylinders. With a crane,
use a secure support such as a platform
or cradle. Do NOT lift cylinders off the
ground by their valves or caps, or by
chains, slings, or magnets.
Do NOT expose cylinders to excessive
heat, sparks, slag, and ame, etc. that
may cause rupture. Do not allow contents
to exceed 55 degrees C (130 degrees
F.) Cool with water spray where such
exposure exists.
Protect cylinders, particularly valves
from bumps, falls, falling objects, and
weather. Replace caps securely when
moving cylinders.
Stuck valve. Do NOT use a hammer
or wrench to open a cylinder valve that
cannot be opened by hand. Notify your
supplier.
Mixing gases. NEVER try to mix any
gases in a cylinder.
NEVER rell any cylinder.
Cylinder ttings should never be modied
or exchanged.
3. Hose
Prohibited use. Never use hose other
than that designed for the specied gas.
A general hose identication rule is: red
for fuel gas, green for oxygen, and black
for inert gases.
Use ferrules or clamps designed for
the hose (not ordinary wire or other
substitute) as a binding to connect hoses
to ttings.
No copper tubing splices. Use only
standard brass ttings to splice hose.
Avoid long runs to prevent kinks and
abuse. Suspend hose off ground to keep
it from being run over, stepped on, or
otherwise damaged.
Coil excess hose to prevent kinks and
tangles.
Protect hose from damage by sharp
edges, and by sparks, slag, and open
ame.
Exami ne hos e r egu lar ly f or lea ks,
wear, and loose connections. Immerse
pressured hose in water; bubbles indicate
leaks
Repair leaky or worn hose by cutting
area out and splicing. Do NOT use
tape.
4. Proper Connections
Clean cylinder valve outlet of impurities
that may clog orices and damage seats
before connecting regulator. Except
for hydrogen, crack valve momentarily,
pointing outlet away from people and
sources of ignition. Wipe with a clean,
lintless cloth.
Match regulator to cylinder. Before
connecting, check that the regulator
label and cylinder marking agree, and
that the regulator inlet and cylinder outlet
match. NEVER Connect a regulator
designed for a particular gas or gases to
a cylinder containing any other gas.
Tighten connections. When assembling
threaded connections, clean and smooth
seats where necessary. Tighten. If
connection leaks, disassemble, clean,
and reti ghten, using properly fitting
wrench.
Adapters. Use a CGA adapter (available
from your supplier) between cylinder
and regulator, if one is required. Use
two wrenches to tighten adapter marked
RIGHT and LEFT HAND threads.
Regulator outlet (or hose) connections
may be identied by right hand threads
for oxygen and left hand threads (with
grooved hex on nut or shank) for fuel
gas.
5. Pressurizing Steps:
Drain regulator of residual gas through
suitable vent before opening cylinder
(or manifold valve) by turning adjusting
screw in (clockwise). Draining prevents
excessive compression heat at high
pressure seat by allowing seat to open
on pressurization. Leave adjusting
screw engaged slightly on single-stage
regulators.
Stand to side of regulator while opening
cylinder valve.
Open cylinder valve slowly so that
regulator pressure increases slowly.
When gauge is pressurized (gauge
reache s regul ator ma ximum ) leave
cylinder valve in following position: for
oxygen and inert gases, open fully to
seal stem against possible leak; for fuel
gas, open to less than one turn to permit
quick emergency shut-off.
Use pressure charts (available from
your supplier) for safe and efficient
rec ommended pressure settings on
regulators.
Check for leaks on rst pressurization
and regularly thereafter. Brush with
soap solution. Bubbles indicate leaks.
Clean off soapy water after test; dried
soap is combustible.
E. User Responsibilities
Follow all Safety Rules.
Remove leaky or defective equipment
from service immediately for repair. Read
and follow user manual instructions.
F. Leaving Equipment Unattended
Close gas supply at source and drain
gas.
G. Rope Staging-Support
Rope staging-support should not be
used for welding or cutting operation;
rope may burn.
1-3 ARC WELDING
Comply with precautions in 1-1, 1-2, and
this section. Arc Welding, properly done,
is a safe process, but a careless operator
invites trouble. The equipment carries
high currents at signicant voltages.
The arc is very bright and hot. Sparks
y, fumes rise, ultraviolet and infrared
energy radiates, weldments are hot,
and compressed gases may be used.
The wise operator avoids unnecessary
risks and protects himself and others
from accidents.
A. Burn Protection
Comply with precautions in 1-2.
The welding arc is intense and visibly
bright. Its radiation can damage eyes,
penetrate lightweight clothing, reect
from light-colored surfaces, and burn
the skin and eyes. Skin burns resemble
Cobra® MX Owner's Manual Page ii
acute sunburn; those from gas-shielded
arcs are m or e severe an d painful.
DON’T GET BURNED; COMPLY WITH
PRECAUTIONS.
1. Protective Clothing
Wear long-sleeve clothing in addition to
gloves, hat, and shoes. As necessary,
use additional protective clothing such
as leather jacket or sleeves, ameproof
apron, and re-resistant leggings. Avoid
outer garments of untreated cotton.
Bare skin protect ion . We ar dar k,
substantial clothing. Button collar to
protect chest and neck, and button
pockets to prevent entry of sparks.
2. Eye and Head Protection
Protect eyes from exposure to arc. Eyes
may be damaged by radiant energy
when exposed to the electric arc, even
when not looking in the direction of the
arc. Never look at an electric arc without
protection.
Welding helmet or shield containing a
lter plate shade no. 12 or denser must
be used when welding. Place over face
before striking arc.
Protect lter plate with a clear cover
plate.
Cracked or broken helmet or shield
should NOT be worn; radiation can be
passed through to cause burns.
Cracked, broken, or loose lter plates
mu s t b e r e p laced IM M E D IATELY.
Replace clear cover plate when broken,
pitted, or spattered.
Flash goggles with side shields MUST
be worn under the helmet to give some
protection to the eyes should the helmet
not be lowered over the face before an arc
is struck. Looking at an arc momentarily
with unprotected eyes (particularly a high
intensity gas-shielded arc) can cause a
retinal burn that may leave a permanent
dark area in the eld of vision.
3. Protection of Nearby Personnel
Enclose the welding area. For production
welding, a separate room or enclosed
bay is best. In open areas, surround
th e op e r a tion with low- r e f l e ctive,
noncombustible screens or panels. Allow
for free air circulation, particularly at
oor level.
Viewing the weld. Provide face shields
for all persons who will be looking directly
at the weld.
Others working in area. See that all
persons are wearing ash goggles.
Before starting to weld, make sure that
screen aps or bay doors are closed.
B. Toxic Fume Prevention
Comply with precautions in 1-2B.
Gen erator engine exh aust must be
ven te d to the outside air. Carbon
monoxide can kill.
C. Fire and Explosion Prevention
Comply with precautions in 1-2C.
Equipment’s rated capacity. Do not
overload arc welding equipment. It may
overheat cables and cause a re.
Loose cable connections may overheat
or ash and cause are.
Never strike an arc on a cylinder or
other pressure vessel. It creates a brittle
area that can cause a violent rupture
or lead to such a rupture later under
rough handling.
D. Compressed Gas Equipment
Comply with precautions in 1-2D.
E. Shock Prevention
Exposed electrically hot conductors or
other bare metal in the welding circuit,
or i n ung round ed, e lec trica lly-H OT
equipment can fatally shock a person
whose body becomes a conductor. DO
NOT STAND, SIT, LIE, LEAN ON, OR
TOUCH a wet surface when welding
without suitable protection.
To protect against shock:
Keep body and clothing dry. Never
work in damp area without adequate
insulation against electrical shock. Stay
on a dry duckboard, or rubber mat when
dampness or sweat cannot be avoided.
Sweat, sea water, or moisture between
body and an electrically HOT part or grounded metal - reduces the body
surface electrical resistance, enabling
dangerous and possibly lethal currents
to ow through the body.
1. Grounding the Equipment
When installing, connect the frames of
each unit such as welding power source,
control, work table, and water circulator
to the building ground. Conductors must
be adequate to carry ground currents
safely. Equipment made electrically HOT
by stray currents may shock, possibly
fatally. Do NOT GROUND to electrical
conduit, or to a pipe carrying ANY gas or
a ammable liquid such as oil or fuel.
Three-phase connection. Check phase
re q u i r ement of equip m e n t b e f ore
installing. If only three-phase power
is av ail able , c onn ect sin gle -pha se
equipment to only two wires of the
three-phase line. Do NOT connect the
equipment ground lead to the third (live)
wire, or the equipment will become
electrically HOT - a dangerous condition
that can shock, possibly fatally.
Be fore wel d ing , che ck g r oun d for
continuity. Be sure conductors are
touching bare metal of equipment frames
at connections.
If a line cord with a ground lead is provided
with the equipment for connection to
a switch box, connect the ground lead
to the grounded switch box. If a threeprong plug is added for connection to a
grounded mating receptacle, the ground
lead must be connected to the ground
prong only. If the line cord comes with a
three-prong plug, connect to a grounded
mating receptacle. Never remove the
ground prong from a plug, or use a plug
with a broken ground prong.
2. Connectors
Fully insulated lock-type connectors
should be used to join welding cable
lengths.
3. Cables
Frequently inspect cables for wear,
cracks, and damage. IMMEDIATELY
REPLACE those with excessively worn
or damaged insulation to avoid possibly
lethal shock from bared cable. Cables
with damaged areas may be taped to
give resistance equivalent to original
cable.
Keep cable dry, free of oil and grease, and
protected from hot metal and sparks.
4. Terminal s and O ther Ex posed
Parts
Terminals and other exposed parts of
electrical units should have insulating
covers secured before operation.
5. Electrode Wire
Electrode wire becomes electrically HOT
when the power switch of gas metal-arc
welding equipment is ON and welding
gun trigger is pressed. Keep hands
and body clear of wire and other HOT
parts.
6. Safety Devices
Sa fet y d evic es suc h as in terl ock s
and c ircuit breakers should not be
disconnected or shunted out.
Before installation, inspection, or service
of equipment, shut OFF all power, and
remove line fuses (or lock or red-tag
switches) to prevent accidental turning
ON of power. Disconnect all cables from
welding power source, and pull all 115
volts line-cord plugs.
Do not open power circuit or change
po l a rity wh i l e weld i n g . If, in a n
emergency, it must be disconnected,
guard against shock burns or ash from
switch arcing.
Leaving equipment unattended. Always
shut OFF, and disconnect all power to
equipment.
Po wer dis conn ect swi tch mus t be
av aila b le n e ar t h e w e ldin g pow e r
source.
Cobra® MX Owner's Manual Page iii
Thank You
For selecting a quality product. We want you to take
pride in operating this product...as much pride as we
have in bringing the product to you!
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.
Model Name & Number _____________________
Code & Serial Number _____________________
Date of Purchase _____________________
Whenever you request replacements parts for, or information on this equipment always
supply the information you have recorded above.
Please Examine Carton and Equipment For Damage Immediately
Read this Owner’s 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.
Section A Installation
Technical Specications
Wire Capacity
.030" - .045" (0.6mm - 1.2mm) solid hard wire, and cored wire
.030" - 1/16" (0.8mm - 1.6mm) aluminum
Wire Speed
800 IPM (20.3 mpm) max
Duty Cycle - 60%
All ratings are using Argon gas
175 Amps/25 Volts Air Cooled, 1/4" Tip (Model 242)
200 Amps/25 Volts Air Cooled, 3/8" Tip (Model 243)
225 Amps/25 Volts Liquid Cooled, 1/4" Tip (Model 237)
250 Amps/25 Volts Liquid Cooled, 3/8" Tip (Model 238)
Support Equipment Required
• C.V. or C.C. power source of sufcient capacity for your needs.
• Regulated gas supply and hoses.
• Properly sized power leads from power source to wire feeder and
ground.
• Water source and hose capable of providing a minimum of 1 quart
(.95 liter) / min. at 45 p.s.i. when using liquid cooled guns.
Coolant Recommendations
Use Cobra Coolant (Aluminum Protection), P/N 931-0060. Cobra Coolant
does not contain reactive sulphur or chlorine and does not react with copper,
brass or aluminum.
The coolant ow rate should be a minimum of 15 GPH (1 qt/min) between
35 and 45psi. Contact the re-circulator manufacturer for specications on
pressure
Gun Lead Connections
Power Cable - Air Cooled
A #2 power cable is used on the Cobra
MX gooseneck gun. The gun end of the
cable is stripped to the copper strands
and wrapped with a copper strip. A
setscrew holds the cable securely in the
gun body with torque requirements of
55-60 in-lb. The cabinet end of the cable
is equipped with a 1/2" ring lug which
attaches to the top hole on the side of
the power block. Supplied with this gun
is a 3/8-16x5/8" bolt, a 3/8" spring lock
washer and a 5/8" at washer to attach
the ring lug to the power block.
®
Power Cable - Liquid Cooled
Cobra® MX liquid cooled gun utilizes a power/liquid cable with a #6 AWG
cable inside a 5/16” diameter hose. The gun end is threaded into the gun
body with torque requirements of 100+5 in-lb.
Cobra® MX Owner's Manual - Page 1
Conduit
The Cobra® MX gun comes standard with a poly-lined conduit, for feeding
aluminum wire. The longer tting with a shallow groove is used on the gun
end. A set screw located on top of the gun handle secures the conduit in
place.
Gas Hose
The gas hose is secured over the barbed gas tting with a tie wrap. The
cabinet end of the gas hose uses our standard gas tting (1/8” - 27 nps).
Coolant Supply Hose
If so equipped; one end of the liquid hose is secured over the barbed liquid
tting with a tie wrap and the other end is connected to the center tting on
the power block.
Electric Cable
A seven conductor control cable is used on the Cobra® MX gun. The gun end
of the control cable is secured to the gun with a boot clamp and soldered into
the pot assembly and micro switch connectors. Slack is left in the electric
cable as it exits the back of the gun to prevent cable breakage. The cabinet
end has a seven pin “W” clocked amphenol connector.
Section B Operation
General
The Cobra® MX gun maintains a constant, steady, uniform wire feed speed,
regardless of curved or looped wire conduit. The constant push exerted
by the slave motor in the cabinet, combined with the pull of the gun motor,
causes the wire to literally oat friction-free through the wire conduit. The
24VDC gun motor is controlled by a three and three-quarter (3 3/4) turn
potentiometer in the gun handle.
Controls and Settings
Potentiometer
The laterally-positioned potentiometer is located in the lower end of the
handle, providing up to 800 ipm with 3 3/4 turns.
Micro Switch
The micro switch assembly consists of the micro switch, and leads.
Trigger Sensitivity
The amount of trigger lever travel can be
shortened for a quicker or more responsive action.
A more sensitive trigger lever is produced by
reducing the gap between the trigger lever and
the micro switch lever. By turning-in the trigger
sensitivity adjustment screw, it closed the gap
between the trigger lever and the micro switch
lever.
This will enable the operator to increase the
sensitivity of the trigger lever.
Trigger Sensitivity Adjustment
Screw Location
Sensitivity Adjustment
With the wire feeder turned on (with or without
welding wire loaded), turn the screw in until the
micro-switch is activated. Once activated, the gun
and wire feeder motors will begin feeding wire.
Cobra® MX Owner's Manual - Page 2
Screw adjusted out of trigger,
pre-setting the micro-switch
lever for shorter motion
sensitivty.
Retract the screw accordingly until the system is deactivated and adjusted to
the operators' liking.
Drive Roll and Idler Rolls
General
The Cobra® MX gun comes standard with a knurled drive roll and a grooved
idler roll, which will handle both hard wire (.030 - .045 inch) and aluminum
wire with diameters from .030-1/16 inch. Optional insulated V-groove drive
rolls are also available for aluminum wire if desired (see optional kits).
Drive roll tension is accomplished with a unique spring-loaded pressure
screw. The Cobra® MX comes from the factory with the pressure adjustment
screw preset. NO ADJUSTMENT IS REQUIRED FOR ALL SIZES
AND TYPES OF WIRES.
Drive Roll Installation/Removal
Note: Neither of the handles needs to be removed to access the drive or
idler rolls.
Cam Lever
1.
Pull the cam lever away from the idler roll.
This will relieve the pressure against the
drive roll (as shown in Figure 1).
Figure 1
2. Align the drive roll removal tool (P/N 931-
0100) over the ats of the drive roll (as
shown in Figure 2). Hold the gun with one
hand or on a table top, with the other hand
give the removal tool a quick snap-turn in
the CLOCKWISE DIRECTION.
3. Once the drive roll is loose, continue to
spin drive roll in the clockwise direction to
remove the drive roll from the gun.
4. Install a new drive roll on the left-hand threaded shaft. The drive roll will
self-tighten when it is feeding wire.
Idler Roll Installation and Removal
(Reference Figure 3)
1. Using a slot type screwdriver, loosen idler screw, taking care not to lose
lock washer under idler roll.
2. Insert new idler roll and lock washer onto screw, insuring that idler groove
is toward top and lock washer is beneath.
3. Tighten.
Figure 2
NOTE: Lock washer must be under idler roll or it will not turn freely.
Figure 3
Cobra® MX Owner's Manual - Page 3
Section C Accessories
A gas ow control mechanism (i.e. solenoid or valve) is required so the
Cobra® MX can be used on Cobra wire feeders. The following kits are
available depending on the wire feeder used. The factory set times (in
seconds) for normal and latched trigger functions is 0.5 pre-purge and 1.0
post-purge.
Gas/Trigger Control Kit, 115V ......................................................... 005-0713
Gas/Trigger Control Kit, 42V ........................................................... 005-0714
Optional Kits
Insulated Drive Roll Kits are used to prevent preheating of the aluminum wire
which may soften it and clog the liner. This picking up of current at the drive
rolls rather than at the contact tip is usually not a problem unless using too
large of a contact tip or excessively oxidized aluminum wire.
Insulated Grooved Drive Roll Kit .................................................. 005-0640
For .030" (0.8mm) dia. aluminum wire. Includes insulated groove drive roll
and insulated idler roll assy.
Insulated Grooved Drive Roll Kit .................................................. 005-0716
For .035" (0.9mm) dia. aluminum wire. Includes insulated groove drive roll
and insulated idler roll assy.
Insulated Grooved Drive Roll Kit .................................................. 005-0642
For .040" (1.0mm) dia. aluminum wire. Includes insulated groove drive roll
and insulated idler roll assy.
Insulated Grooved Drive Roll Kit....................................................005-0718
For 3/64" (1.2mm) dia. aluminum wire. Includes insulated groove drive roll
and insulated idler roll assy.
Insulated Grooved Drive Roll Kit....................................................005-0644
For .062" (1.6mm) dia. aluminum wire. Includes insulated groove drive roll
and insulated idler roll assy.
Handle Kit..........................................................................................005-0725
Includes left and right handles, screws and drive roll door.
Trigger Kit..........................................................................................005-0726
Trigger kit includes a spring and sensitivity adjustment screw replacement for
all Cobra® MX guns.
Micro Switch Kit................................................................................003-2274
Replacement micro switch assembly for all Cobra® MX guns.
Potentiometer Kit..............................................................................003-2190
Replacement potentiometer assembly for all Cobra® MX guns.
Conduits
Flat spiral steel conduit for steel & cored wire.
615-0208 ......................................................................................... 15 ft./4.5m
615-0216 ......................................................................................... 25 ft./7.6m
615-0219 ....................................................................................... 35 ft./10.7m
615-0218 ....................................................................................... 50 ft./15.2m
Snake Skins
Snake Skin protective covers are now standard on all guns. You may order
spare replacement covers to protect the lead assy of the gun when the
factory one becomes damaged or worn. It can easily be replaced in the eld
by means of Velcro©.
Snake Skin Cover 13ft (for 15ft leads) ........................................931-0110
Snake Skin Cover 23ft (for 25ft leads) ....................................... 931-0122
Snake Skin Cover 33ft (for 35ft leads) ....................................... 931-0132
Snake Skin Cover 48ft (for 50ft leads) ....................................... 931-0123
Cobra® MX Owner's Manual - Page 4
Gas Valve Removal Tool
Gas valve removal is performed by using P/N 931-0105 Gas Valve Removal
Tool. This multifunctional tool has been slotted on one side to encompass
and conform to the gas valve stem and seat into the slotted gas valve body
as seen in Figures 1 and 2. Removal of the gas valve can be accomplished
by turning the gas valve tool counter clockwise. Reinstall by turning clockwise. The tool doubles as a bottle opener.
Gas Valve Removal Tool
Figure 1
Figure 2
Contact Tips
(Models 238 and 243)
Heavy Duty Contact Tip - 3/8" Diameter*
Wire Size Tip ID Arc Tip Length Part No.
.030” (0.8mm) .040” (1.0mm) Spray 1.57” (39.9mm) 621-0390-25
Short 1.82” (46.2mm) 621-0396-25
.035” (0.9mm) .045” (1.1mm) Spray 1.57” (39.9mm) 621-0391-25
621-0391-250
621-0391-500
.035" (0.9mm) .045" (1.1mm) Short 1.82” (46.2mm) 621-0397-25
.045" (1.1mm) .054" (1.37mm) Short 1.82” (46.2mm) 621-0398-25
3/64” (1.2mm) .054” (1.37mm) Spray 1.57” (39.9mm)
3/64” (1.2mm) .060” (1.5mm) Spray 1.57” (39.9mm) 621-0393-25**
1/16” (1.6mm) .074” (1.9mm) Spray 1.57” (39.9mm) 621-0394-25
.085” (2.16mm) Spray 621-0395-25
†
*
Use of tip removal tool is recommended
**This size tip furnished with gun
Also sold in quantities of 250
† †
Also sold in quantities of 500
621-0392-25
621-0392-250
621-0392-500
621-0393-250
621-0393-500
†
††
†
††
†
††
(Models 237 and 242)
1/4" Diameter Contact Tip*
Wire Size Tip ID Stamp Arc Length Part No.
.023"(0.6mm) .031"(0.8mm) Spray 1.50"(38.1mm) 621-0057-25
.030"(0.8mm) .037"(.09mm) Spray 1.50"(38.1mm) 621-0325-25
.030"(0.8mm) .040"(1.0mm) Spray 1.50"(38.1mm) 621-0076-25
.035"(0.9mm) .045"(1.0mm) Spray 1.50"(38.1mm) 621-0001-25**
3/64"(1.2mm) .054"(1.37mm) Spray 1.50"(38.1mm) 621-0327-25
3/64"(1.2mm) .060"(1.5mm) Spray 1.50"(38.1mm) 621-0003-25†**
1/16"(1.6mm) .074"(1.9mm) Spray 1.50"(38.1mm) 621-0075-25
1/16"(1.6mm) .085"(2.1mm) Spray 1.50"(38.1mm) 621-0153-25
.023"(0.6mm) .031"(0.8mm) Short 1.75"(44.5mm) 621-0328-25
.030"(0.8mm) .037"(.09mm) Short 1.75"(44.5mm) 621-0326-25
.035"(0.9mm) .040"(1.0mm) Short 1.75"(44.5mm) 621-0077-25
.035"(0.9mm) .045"(1.1mm) Short 1.75"(44.5mm) 621-0002-25
* All tips sold in quantities of 25
** Also sold in quantities of 250 and 500
†
This size tip furnished with gun
Cobra® MX Owner's Manual - Page 5
MAX Cups
(Models 238 and 243)
Cup I.D. Part No. Cup I.D. Part No.
#6, 3/8" (9.5mm) 621-0420 #5, 1/4" (6.4mm) 621-0079
#8, 1/2" (12.7mm) 621-0421* #6, 3/8" (9.5mm) 001-0137
#10, 5/8" (15.9mm) 621-0422 #8, 1/2" (12.7mm) 001-0138*
*standard - furnished with gun
†
sold in packs of 4 each
Part Number Description
931-0137 Teon liner package, 5 pieces
615-0341 Steel wire only, .030 - 1/16" (0.8 - 0.9mm)
621-0423 Tip Extender, MAX Cup (stackable)
621-0017 Tip Extender, Classic Cup (stackable)
615-0248 Spiral steel liner for tip extender
Section D Maintenance
Periodic Maintenance
Your Cobramatic system is designed to provide years of reliable service.
Maintenance of the gun will normally consist of a general cleaning of the wire
guide system, including barrels, drive rolls, and conduits at regular intervals.
Remove spatter build-up from inside of nozzles with a hardwood stick.
The only parts on the Cobramatic system that are subject to normal wear are
the conduit, contact tips, gas cups, front body liners, wire guides, drive and
idler rolls. A supply of these parts should be maintained on hand.
The number of units in operation and the importance of minimal down time
will determine to what extent spare parts should be stocked on hand. See
the recommended spare parts list for the most commonly replaced parts.
If repairs do become necessary, qualied shop maintenance personnel can
easily replace any part.
(Models 237 and 242)
#10, 5/8" (15.8mm) 001-0139
Gun Barrel Liners
Classic Cups
†
†
†
Maintenance Tools
Tool Part Number
Contact Tip Removal Tool 931-0002
Drive Roll Removal Tool 931-0100
Cobra® MX Owner's Manual - Page 6
Recommended Spare Parts List
Qty. Part No. Description
1 615-0601-15 Conduit - 15 ft
1 615-0601-25 Conduit - 25 ft
1 615-0601-35 Conduit - 35 ft
1 615-0601-50 Conduit - 50 ft
2 005-0726 Trigger Assy Kit
2 003-2190 Potentiometer Assy Kit
1 005-0725 Handle Kit
2 003-2274 Micro-Switch Assy Kit
10 511-0101 Drive Roll
5 511-0001 Idler Roll
DRIVE ROLL REMOVAL TOOL
931-0100
KNURLED DRIVE ROLL
511-0101
IDLER ROLL
511-0001
(.030" - 3/64")
IDLER ROLL
511-0113
(.023")
MICRO SWITCH ASSY
003-2274
Cobra® MX Owner's Manual - Page 7
Section E Troubleshooting
Trouble Cause Remedy
No wire feed at
gun, feeder not
operating, i.e. no
slave motor or
brake solenoid.
No wire feed
at gun, feeder
operating properly.
Wire feeds, but
welding wire is not
energized.
Wire feeds
erratically.
Wire feeds one
speed only.
Wire walks out of
drive rolls.
Input power fuse in
feeder/control box blown
Micro-switch defective/not
being activated
Broken electrical cable
Motor control fuse in
feeder/control box blown
Bad potentiometer
Broken electrical cable.
Bad speed control/PCB.
Loose or no cable
connections.
Contactor control cable
loose or in wrong position
Welding power source Check power source.
Dirty or worn conduit
Wrong size contact tip See contact tip table.
Idler roll stuck
Bad potentiometer Check with meter.
Broken electrical cable
Bad speed control
Idler roll upside-down
Rear wire guide missing Replace wire guide.
Replace fuse.
Replace switch. Check
switch for operation.
Check micro-switch wires
for continuity.
Check motor leads for
shorts; then replace fuse.
Check potentiometer with
meter.
Check motor and
potentiometer wires for
continuity.
See specic cabinet/
control box owner's
manual for speed control
operation.
Check all power
connections.
Check power supply
owner's manual for
location and type of
contactor signal required,
i.e. closing or 115VAC.
Blow out or replace
conduit.
Check for lock washer
under idler roll, or replace
if damaged.
Check potentiometer
wires for continuity or
short.
See specic cabinet/
control owner's manual for
speed control operation.
Place groove in idler roll
toward top.
Cobra® MX Owner's Manual - Page 8
Troubleshooting Guide
Regardless of which gun or feeder used, all MK Products’ push-pull guns
operate on the same principle. The slave motor in the feeder runs at a
fast,constant speed, but has very low torque. It is always trying to feed
more wire than the gun motor wants, and when the motor gets all it wants, it
slows the slave motor, preventing a bird’s nest. Because of the low torque
produced by the slave motor, a brake system is used to prevent wire overrun
rather than tension. The drag adjustment in the feeder is used simply to
keep the wire slightly taut, so it will not pull off the spool while feeding wire.
The high torque 24VDC gun motor is controlled by a solid state speed
control located in the feeder, and a pot located in the gun. The gun motor,
potentiometer, and micro switch are connected to the cabinet/control box via
a control cable and Amphenol connector. If this cable becomes damaged, a
variety of symptoms can occur, depending on which wire(s) break. To test,
check each wire for continuity and shorts.
Remember, the micro switch in the gun activates both the slave motor and
gun motor circuits in the cabinet. Therefore, if the slave motor and brake
solenoid operate, but the gun does not, look more toward the gun motor’s 24
V circuits, speed control, control cable, or the gun motor. If nothing operates,
look more toward the slave motor’s input, micro switch leads, or micro switch.
Testing The Gun
Reference the "W" clocked gun wiring diagram on
the Cobra® MX electrical diagram for information
about pin-outs and locations.
Motor Check
Remove the gun connector from the cabinet.
Using the gun Amphenol connector, check the resistance across pins “A”
and “B” (motor leads). The resistance across the motor should be between
5 - 10 ohms as the potentiometer is turned.
If an open circuit or short exist, check the motor leads and motor
independently.
Testing the Potentiometer - “W” Clocked
Using the gun amphenol connector, check the resistance across pin “D”
(wiper) and pin “C”. The resistance should vary from 0 - 5K ohms as the
potentiometer is turned.
Check the resistance across pin “D” (wiper) and pin “G”. The resistance
should vary from 5K - 0 ohms as the potentiometer is turned.
Testing the Micro Switch
Using the gun amphenol connector, check for continuity across pins “E” and
“F” when the trigger is pressed.
Cobra® MX Owner's Manual - Page 9
THIS PAGE INTENTIONALLY BLANK
Section F
Appendices
Diagrams / Parts List
Exploded View .......................................................................... 12
Bill of Material ........................................................................... 13
Front Body Assembly ................................................................ 14
Rear Body Assembly, Liquid Cooled ......................................... 15
Classic Cup Barrel Assembly, Liquid Cooled ............................ 16
MAX Cup Barrel Assembly, Liquid Cooled ................................ 17
Lead Assembly, Liquid Cooled .................................................. 18
Rear Body Assembly, Air Cooled .............................................. 19
Classic Cup Barrel Assembly, Air Cooled ................................. 20
MAX Barrel Assembly, Air Cooled ............................................. 21
Lead Assembly, Air Cooled ....................................................... 22
Electrical ................................................................................... 23
Gun Connections, Air and Liquid Cooled .................................. 24
Cobra® MX Owner's Manual - Page 11
Cobra® MX Head Assembly
APPLY THREAD LOCKING COMPOUND TO CONTACT SURFACE FOR INSTALLATION
APPLY COMPOUND NOALOX TO CONTACT SURFACE FOR INSTALLATION
APPLY COMPOUND GREASE TO CONTACT SURFACE FOR INSTALLATION
Cobra® MX Owner's Manual - page 12
Liquid Cooled Version Shown
MX Head Assembly
®
Cobra
Handle Kit: Includes line items 13, 17
and 19
1 005-0725
1 003-2267 Rear Body Assy, Air Cooled 14 4 338-0022 Scr SHC 6-32 x 3/8 SST
1 003-2276 Rear Body Assy, Liquid Cooled 15 5 338-0034 Scr SHC 8-32 x 1/2 SST
1 1 002-0629 Assy Cam Idler Arm 11 4 333-0260 Wshr Spr LK #6 SST
2 1 003-2141 Front Body Assy 12 5 333-0261 Wshr Spr LK #8 SST
3 1 003-2190 Assy Pot 13 7 338-0014 Scr SHC 4-40 x 1/2 SST
4
5 1 003-2274 Assy Switch 16 1 421-0713 Pin Dowel 3/32 x 3/4 SST
No. Qty. Part No. Description No. Qty. Part No. Description
Cobra® MX Owner's Manual - page 13
6 1 005-0726 Assy Trigger 17 1 431-1892 Scr Shoulder 1/8 Door MX
7 1 211-0085 Motor 18 1 435-1585 Strap Motor
8 2 319-0254 Scr FH Phil 82 4-40 x 3/8 SST 19 1 437-0253 Door Molded
9 1 319-0258 Scr FH Phil 82 4-40 x 5/8 SST 20
10 3 320-0101 Scr Button 4-40 x 3/16 SST 21
Cobra® MX Front Body Assembly
003-2141
Front Body Assembly
No. Qty. Part No. Description
1 - - Not Available Separately
2 - - Not Available Separately
3 1 325-0206 Scr Ph 10-24-3/8
4 1 333-0082 Washer Lock 10
5 1 419-0092 Spring Comp 0.31 OD x 0.20 ID
6 1 421-0525 Pin Dowel 1/8 x 7/8 Sst
7 1 431-1663 Scr Adjust Idler
8 1 431-1598 Arm Idler Python
9 1 511-0001 Assy Idler Wire Feed
10 1 511-0101 Drive Roll Gold
Cobra® MX Owner's Manual - page 14
Cobra® MX Rear Assembly - Liquid Cooled
APPLY SILICONE
LUBRICANT
FOR INSTALLATION
003-2276
Rear Body Assembly - Liquid Cooled
No. Qty. Part No. Description
1 1 001-0562 Assy Gas Valve
2 - - Not Available Separately
3 6 303-0096 O-Ring .145 ID x .07 W
4 1 321-1104 Set Screw Conduit
5 2 411-0020 Tie Wrap (not shown for clarity)
Cobra® MX Owner's Manual - page 15
Cobra® MX Classic Cup Barrel Assembly
Liquid Cooled - 003-2342
*Apply silicone lubricant to item
Classic Cup Barrel Assembly - Liquid Cooled
No. Qty. Part No. Description
1 1 001-0138 Assy Gas Cup MK #8
2 - - Not Available Separately
3* 6 303-0096 O-Ring .145 ID x .07W
4 1 437-0299 Insulation Barrel
5 1 931-0137 5-Piece Teon Liner Package
6 1 621-0003 Tip 0.06 x 0.25 OD
Cobra® MX Owner's Manual - page 16
3 before installing.
*Apply silicone lubricant to item
2 before installing.
Cobra® MX MAX Cup Barrel Assembly
Liquid Cooled - 003-2344
MAX Cup Barrel Assembly - Liquid Cooled
No. Qty. Part No. Description
1 - - Not Available Separately
2* 6 303-0096 O-Ring .145 ID x .07W
3 1 437-0299 Insulation Barrel
4 1 931-0137 5-Piece Teon Liner Package
5 1 621-0393 Tip HD Spray .060
6 1 621-0421 Assy Gas Cup #8 CobraMAX
Cobra® MX Owner's Manual - page 17
Cobra® MX Lead Assembly - Liquid Cooled
TORQUE REQUIRES 100+5 IN-LB
Cobra® MX Lead Assembly - Liquid Cooled
No. Qty. Description 15' Part No. 25' Part No. 35' Part No. 50' Part No.
1 1 Assy Gas Hose 552-0242-15 552-0242-25 552-0242-35 552-0242-50
2 1 Assy Liquid Hose 552-0243-15 552-0243-25 552-0243-35 552-0243-50
3 1 Assy Conduit 615-0601-15 615-0601-25 615-0601-35 615-0601-50
4 1 Assy Power Cable W/C #6 843-0685-15 843-0685-25 843-0685-35 843-0685-50
5 1 Assy Controller Cable 005-0690 005-0691 005-0740 005-0692
6 1 Snake Skin 931-0110 931-0122 931-0132 931-0123
7 2 Wrap Spiral Cord 261-0094
Cobra® MX Owner's Manual - page 18
Cobra® MX Rear Assembly - Air Cooled
APPLY SILICONE
LUBRICANT
FOR INSTALLATION
003-2267
Air Cooled Rear Body Assembly
No. Qty. Part No. Description
1 1 001-0562 Assy Gas Valve
2 1 - Not Available Separately
3 2 303-0096 O-Ring .145 ID x .07 W
4 1 321-1082 Set Screw Cup 1/4 - 20 x 3/8 SST
5 1 321-1104 Set Screw Conduit
6 1 411-0020 Tie Wrap
Cobra® MX Owner's Manual - page 19
Cobra® MX Classic Cup Barrel Assembly
Air Cooled - 003-2341
*Apply silicone lubricant to item
Classic Cup Barrel Assembly - Air Cooled
No. Qty. Part No. Description
1 1 001-0138 Assy Gas Cup MK #8
2 - - Not Available Separately
3* 2 303-0096 O-Ring .145 ID x .07W
4 1 437-0299 Insulation Barrel
5 1 931-0137 5-Piece Teon Liner Package
6 1 621-0003 Tip 0.06 x 0.25 OD
Cobra® MX Owner's Manual - page 20
3 before installing.
Cobra® MX MAX Cup Barrel Assembly
Air Cooled - 003-2343
*Apply silicone lubricant to item
MAX Cup Barrel Assembly - Air Cooled
No. Qty. Part No. Description
1 - - Not Available Separately
2* 6 303-0096 O-Ring .145 ID x .07W
3 1 437-0299 Insulation Barrel
4 1 931-0137 5-Piece Teon Liner Package
5 1 621-0393 Tip HD Spray .060
6 1 621-0421 Assy Gas Cup #8 CobraMAX
Cobra® MX Owner's Manual - page 21
2 before installing.
Cobra® MX Lead Assembly - Air Cooled
TORQUE REQUIRES 55-60 IN-LB
Cobra® MX Lead Assembly - Air Cooled
No. Qty. Description 15' Part No. 25' Part No. 35' Part No. 50' Part No.
1 1 Assy Gas Hose 552-0242-15 552-0242-25 552-0242-35 552-0242-50
2 1 Assy Conduit 615-0601-15 615-0601-25 615-0601-35 615-0601-50
3 1 Assy Power Cable A/C 843-0630-15 843-0630-25 843-0630-35 843-0630-50
4 1 Assy Controller Cable 005-0690 005-0691 005-0740 005-0692
5 1 Snake Skin 931-0110 931-0122 931-0132 931-0123
6 2 Wrap Spiral Cord 261-0094
7 1 SCR HX 3/8 - 16 x 5/8 ST 329-0054
8 1 Wshr Spr Lk #3/8 333-0011
9 1 Wshr .391 x .875 x .063 BS 331-0777
Cobra® MX Owner's Manual - page 22
E
C
A
B
D
G
F
+
-
TORCH
MOTOR
TORCH
POT
TORCH
TRIGGER
5K
Red
Red
Black
Black
Blue
Blue
Yellow
Yellow
Brown
Brown
White
White
Green
Green
1
3
2
Cabinet End
Amphenol Connector
Torch Functions
Torch Lead
Cobra® MX Electrical
Cobra® MX Owner's Manual - page 23
Gun Connections
Coolant
Return
Coolant
Supply
Input
Shielding
Gas
Input
Welding
Power
Liquid Cooled
Gas
Power
Cable
Gun
Power/Coolant
Return
Coolant
Supply
GunAir Cooled
Shielding
Gas
Welding
Power
Cobra® MX Owner's Manual - page 24
Gas
Safety Warnings
Cobra® MX Owner's Manual - page 25
Cobra® MX Owner's Manual - page 26
LIMITED WARRANTY
Effective October 1, 2006
This warranty supersedes all previous MK Products warranties and is
exclusive, with no other guarantees or warranties expressed or implied.
LIMITED WARRANTY - MK Products,Inc.,Irvine,California
warrants that all new and unused equipment furnished by MK
Products is free from defects in workmanship and material as
of the time and place of delivery by MK Products. No warranty
is made by MK Products with respect to trade accessories or
other items manufactured by others. Such trade accessories
and other items are sold subject to the warranties of their
respective manufacturers, if any.
MK Products’ warranty does not apply to components having
normal useful life of less than one (1) year, such as relay points,
wire conduit, tungsten, and welding gun parts that come in
contact with the welding wire, including gas cups, gas cup
insulators, and contact tips where failure does not result from
defect in workmanship or material.
MK Products shall, exclusively remedy the limited warranty or
any duties with respect to the quality of goods, based upon
the following options
(1) repair
(2) replacement
(3) where authorized in writing by MK Products, the reasonable
cost of repair or replacement at our Irvine, California plant.
As a matter of general policy only, MK Products may honor an
original user’s warranty claims on warranted equipment in the
event of failure resulting from a defect within the following periods
from the date of delivery of equipment to the original user:
1. Power Supplies and Wire Feed Cabinets ....... 3 years
2. Weldheads, Positioners, Prince XL and Prince XL
Spool Guns, Python, CobraMAX, Cobra SX, Cobra
MX ...................................................................1 year
3. Sidewinder® Spool Gun, Prince SG Spool Guns,
Modules ...................................................... 180 days
4. Repairs/Exchanges/Parts ........................... 90 days
Classication of any item into the foregoing categories shall be
at the sole discretion of MK Products. Notication of any failure
must be made in writing within 30 days of such failure.
A copy of the invoice showing the date of sale must accompany
products returned for warranty repair or replacement.
All equipment returned to MK Products for service must be
properly packaged to guard against damage from shipping.
MK Products will not be responsible for any damages resulting
from shipping.
Normal surface transportation charges (one way) for products
returned for warranty repair or replacement will be borne by MK
Products, except for products sold to foreign markets.
ANY EXPRESS WARRANTY NOT PROVIDED HEREIN AND ANY
IMPLIED WARRANTY, GUARANTY, OR REPRESENTATION AS
TO PERFORMANCE, AND ANY REMEDY FOR BREACH OF CONTRACT WHICH, BUT FOR THIS PROVISION, MIGHT ARISE BY
IMPLICATION, OPERATION OF LAW, CUSTOM OF TRADE, OR
COURSE OF DEALING, INCLUDING ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR OF FITNESS FOR PARTICULAR
PURPOSE, WITH RESPECT TO ANY AND ALL EQUIPMENT FURNISHED BY MK PRODUCTS, IS EXCLUDED AND DISCLAIMED
BY MK PRODUCTS.
EXCEPT AS EXPRESSLY PROVIDED BY MK PRODUCTS IN WRITING, MK’s PRODUCTS ARE INTENDED FOR ULTIMATE PURCHASE
BY COMMERCIAL/INDUSTRIAL USERS AND FOR OPERATION BY
PERSONS TRAINED AND EXPERIENCED IN THE USE AND MAINTENANCE OF WELDING EQUIPMENT AND NOT FOR CONSUMERS
OR CONSUMER USE. MK PRODUCTS’ WARRANTIES DO NOT
EXTEND TO, AND NO RE-SELLER IS AUTHORIZED TO EXTEND
MK PRODUCTS’ WARRANTIES TO ANY CONSUMER.
USE O F OT H E R T HAN
CONSUMABLES, PARTS, AND ACCESSORIES MAY INVALIDATE
YOUR PRODUCT WARRANTY.
GE N UI N E
M K P R OD U C T S’
16882 Armstrong Ave.
Irvine, CA 92606
Tel (949)863-1234
Fax (949)474-1428
www.mkproducts.com
www.mkproducts.com
16882 Armstrong Ave.
Irvine, California 92606
TEL (949) 863-1234 FAX (949) 474-1428
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