Forney 85650 User manual

ITEM# 85650
REV 04.14.2022
FORNEY 250 MULTI-MACHINE
SPOOL GUN
ENGLISH

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Forney Promise
We are committed to your success regardless of location, size or
needs. We understand it is your goal to get the job done right,
and we are ready to help you do just that.
President's Message
We market the highest quality tools, equipment and accessories
for the do-it-yourselfer and professional. Our passion and
dedication in bringing new products to the industrial and retail
market, combined with our personal service, is unmatched in our
industry. Our ability to listen to our customers’ needs enables us to
create solutions to their problems.
Our dedication to the highest quality customer service within our
corporate headquarters and the service provided in the field is
unequaled. We are committed to creating the best solutions to our
customer’s needs. Above all, our employees will provide the same
respect and caring attitude within the organization as they are
expected to share with every Forney customer. Our goal will be to
exceed our customers’ expectations through empowered people,
guided by shared values and commitments.
We work hard so our customers trust us because of our integrity,
teamwork and innovation in the welding & metalworking industry.
90 years of unmatched product quality and an unwavering
commitment to our customers.
When our customers succeed we succeed.
STEVEN G. ANDERSON, President & CEO
Copyright©2022 Forney Industries,
Inc. All rights reserved. Unauthorized
reproduction and/or distribution is
subject to US copyright laws.
U.S. Facilities:
- Fort Collins, CO
- Vandalia, OH
WAYS TO ORDER
Web: www.forneyind.com
Phone: [phone]
Fax: [phone]
Mail: Forney Industries
2057 Vermont Drive
Fort Collins, CO 80525
Steven G. Anderson

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TECHNICAL ISSUES?
FORNEY CAN HELP!
WE MAKE IT EASY!
Please contact Forney Industries Technical
Service at 800-521-6038 x2 or
customerserv[email protected] for inquires,
technical and general questions.
Thank you for choosing Forney! Please note: The store you purchased
this m achine from DOES NOT handle product r eturns. F orney
Industries will repair or replace defective products at no charge to you!
When you call Forney's Technical Service department, you will speak
to a trained product and application expert. Forney's primary goal is
to get your machine up and running in as little time as possible. In fact,
the majority of issues can be fixed over the phone! Please be near your
machine when you call, so the Forney technician can guide you.
Speaking to a Forney Technician directly helps us gather better data,
and i mprove our p roducts. I t is our h ighest priority t o ensure our
customers are cared for.

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WARRANTY..........................................................................................................................................................................3
TABLE OF CONTENTS............................................................................................................................................................4
SYMBOLS LEGEND................................................................................................................................................................5
SAFETY SUMMARY ...............................................................................................................................................................5
PRINCIPAL SAFETY STANDARDS .....................................................................................................................................5
CALIFORNIA PROPOSITION 65 WARNING.....................................................................................................................6
EMF INFORMATION.......................................................................................................................................................6
PERSONAL PROTECTION ...............................................................................................................................................6
FIRE PREVENTION..........................................................................................................................................................7
HIGH FREQUENCY RADIATION......................................................................................................................................8
ARC WELDING ..............................................................................................................................................................8
ELECTRIC SHOCK...........................................................................................................................................................8
NOISE...........................................................................................................................................................................9
ADDITIONAL SAFETY INFORMATION .............................................................................................................................9
INSTALLATION ....................................................................................................................................................................10
SPOOL GUN SPECIFICATIONS .....................................................................................................................................10
SITE SELECTION...........................................................................................................................................................10
VENTILATION ..............................................................................................................................................................10
ADDITIONAL WARNINGS ............................................................................................................................................10
GETTING TO KNOW YOUR SPOOL GUN .............................................................................................................................11
DESCRIPTION ..............................................................................................................................................................11
WELDER LAYOUT AND CONTROLS……………………………………………………………………………………...........11-12
INSTALLING THE SPOOL GUN ASSEMBLY.....................................................................................................................12
GAS CYLINDER AND REGULATOR CONNECTION ........................................................................................................13
INSTALLING THE WELDING WIRE………………………………………………………………………………………..........13-15
DRIVE ROLL GROOVE SELECTION ………………………………………………………………………………………..............16
CHANGING THE DRIVE ROLLER ……………………………………………………………………………………….................16
OPERATION........................................................................................................................................................................17
WELDING PREPARATION..............................................................................................................................................17
FACTORS TO CONSIDER FOR BEST MIG WELDING RESULTS .........................................................................................17
ADJUSTING MACHINE SETTINGS …………………………………………………………………………………………...........18
PUSH VS. PULL………………………………………………………………………………………………………………….........18
SETTINGS CHART………………………………………………………………………………………………..……………..........19
MAINTENANCE & SERVICING .............................................................................................................................................20
GENERAL MAINTENANCE..................................................................................................................................................20
CONSUMABLE MAINTENANCE..........................................................................................................................................20
TROUBLESHOOTING......................................................................................................................................................21-22
SPOOL GUN CONSUMABLES LIST .......................................................................................................................................23
Table of Contents

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CAUTION!
BEFORE INSTALLING, OPERATING OR CARRYING OUT MAINTENANCE ON THE MACHINE, READ THE CONTENTS
OF THIS MANUAL CAREFULLY, PAYING PARTICULAR ATTENTION TO THE SAFETY RULES AND HAZARDS.
In the event of these instructions not being clear, please contact your
Forney Authorized Dealer or Forney Customer Service 1-800-521-6038.
The data within this safety summary are highlights of various safety standards. It is recommended
that you familiarize yourself with the standards listed below before beginning welding.
• ANSI Z49.1: SAFETY IN WELDING AND CUTTING - Obtainable from the American Welding Society, 550 NW Le Jeune
Road, Miami, FL 33126 Telephone [phone], Fax [phone] - www.aws.org.
• OSHA 29 CFR, Part 1910, Subpart Q.: WELDING, CUTTING AND BRAZING - Obtainable from your state OSHA office
or U.S. Dept. of Labor OSHA, Office of Public Affairs, Room N3647, 200 Constitution Ave., Washington, DC 20210 -
www.osha.gov.
• AWS F4.1: SAFE PRACTICES FOR THE PREPARATION FOR WELDING AND CUTTING OF CONTAINERS AND PIPING
FOR WELDING AND CUTTING. - Obtainable from the American Welding Society, 550 NW Le Jeune Road, Miami, FL
33126 Telephone [phone], Fax [phone] - www.aws.org.
• AWS A6.0. WELDING AND CUTTING CONTAINERS WHICH HAVE HELD COMBUSTIBLES - Obtainable from the
American Welding Society, 550 NW Le Jeune Road, Miami, FL 33126 Telephone [phone], Fax [phone]
- www.aws.org.
• NFPA 70: NATIONAL ELECTRICAL CODE - Obtainable from the National Fire Protection Association, 1 Batterymarch
Park, P.O. Box 9101, Quincy, MA 02269-9101 Telephone [phone] Fax [phone] - www.nfpa.org.
• CGA Publication P-1: SAFE HANDLING OF COMPRESSED GASES IN CONTAINERS - Obtainable from Compressed
Gas Association, 14501 George Carter Way, Suite 103, Chantilly, VA 20151 Telephone [phone] Fax (703)
961-1831 - www.cganet.com.
• CSA W117.2 - Code for SAFETY IN WELDING AND CUTTING. - Obtainable from Canadian Standards Association,
178 Rexdale Blvd., Etobicoke, Ontario M9W 1R3 - www.csa.ca.
Symbols Legend
Safety Summary
Principal Safety Standards
SYMBOL MEANING SYMBOL MEANING SYMBOL MEANING
ARC RAYS HAZARD
FIRE HAZARD NOISE HAZARD
POISON HAZARD
ELECTRICAL HAZARD WARNING/CAUTION
MIG (GMAW) INPUT VOLTAGE LINE CONNECTION
STICK (SMAW) TEMPERATURE SINGLE PHASE ALTERNATING
CURRENT (AC)
TIG (GTAW) VOLTAGE DIRECT CURRENT (DC)
POSITIVE DINSE AMPERAGE SUITABLE FOR WELDING IN AN
ENVIRONMENT WITH INCREASED
RISK OF ELECTRIC SHOCK
NEGATIVE DINSE WIRE FEED
ION O
OFF SINGLE PHASE STATIC FREQUENCY
CONVERTER TRANSFORMER RECTIFIER

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• ANSI Z87.1 - SAFE PRACTICE FOR OCCUPATION AND EDUCATIONAL EYE AND FACE PROTECTION - Obtainable
from the American National Standards Institute, 11 West 42nd St., New York, NY 10036 Telephone [phone], Fax
[phone] - www.ansi.org.
• NFPA 51B: STANDARD FOR FIRE PREVENTION DURING WELDING, CUTTING, AND OTHER HOT WORK- Obtainable
from the National Fire Protection Association, 1 Batterymarch Park, P.O. Box 9101, Quincy, MA 02269-9101 Telephone
[phone] Fax [phone] - www.nfpa.org.
California Proposition 65 Warning
WARNING: This product can expose you to chemicals, including lead, which are known to the State of California to
cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. P65
details at forneyind.com. Wash hands after use.
EMF Information
Welding current, as it flows through the welding cables, will cause electromagnetic fields. There has been and still is some
concern about such fields. However, after examination, the committee of the National Research Council concluded that:
“The body of evidence, in the committee’s judgment, has not demonstrated that exposure to power-frequency electric and
a magnetic field is a human health hazard.” However, studies are still going forth and evidence continues to be examined.
Until the final conclusions of the research are reached, you may wish to minimize your exposure to electromagnetic fields
when welding.
To reduce magnetic fields in the workplace, use the following procedures:
1. Keep electrode and ground cables close together by twisting or taping them when possible.
2. Arrange cables to one side and away from the operator.
3. Do not coil or drape cables around your body.
4. Keep welding power source and cables as far away from operator as practical.
5. Connect ground clamp to workpiece as close to the cut or weld as possible.
ABOUT PACEMAKERS & HEARING AIDS:
Pacemaker and hearing aid wearers consult your doctor first. If cleared by your doctor, then following the above
procedures is recommended.
Personal Protection
Welding processes of any kind can be dangerous not only to the operator but to any person situated near the equipment,
if safety and operating rules are not strictly observed.
THE WELDING ARC PRODUCES VERY BRIGHT ULTRAVIOLET AND INFRARED LIGHT. THESE
ARC RAYS WILL DAMAGE YOUR EYES AND BURN YOUR SKIN IF YOU ARE NOT
PROPERLY PROTECTED. To reduce the risk of injury from arc rays, read, understand, and follow the safety
instructions. In addition, make certain that anyone else that uses this welding equipment, or is a bystander in the
welding area understands and follows these safety instructions as well. Helmets and filter should conform to ANSI Z87.1
standards.
• Do not look at an electric arc without proper protection. A welding arc is extremely bright and intense and, with
inadequate or no eye protection, the retina can be burned, leaving a permanent dark spot in the field of vision. A
shield or helmet with a #10 shade filter lens (minimum) must be used.
• Provide bystanders with shields or helmets fitted with an appropriate shade filter lens.
• Do not strike a welding arc until all bystanders and you (the welder) have welding shields and/or helmets in place.
• Do not wear a cracked or broken helmet and replace any cracked or broken filter lenses immediately.
• Do not allow the uninsulated portion of the MIG gun to touch the ground clamp or grounded workpiece to prevent an
arc flash from being created on contact.
• Wear protective clothing. The intense light of the welding arc can burn the skin in much the same way as the sun,
even through lightweight clothing. Wear dark clothing of heavy material. The shirt worn should be long sleeved and
the collar kept buttoned to protect chest and neck.
• Protect against reflected arc rays. Arc rays can be reflected off shiny surfaces such as a glossy painted surface,
aluminum, stainless steel, and glass. It is possible for your eyes to be injured by reflected arc rays even when wearing
a protective helmet or shield. If welding with a reflective surface behind you, arc rays can bounce off the surface and
off the filter lens. It can get inside your helmet or shield and into your eyes. If a reflective background exists in your

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welding area, either remove it or cover it with something non-flammable and non- reflective. Reflective arc rays can
also cause skin burn in addition to eye injury.
• Flying sparks can injure. Wear proper safety equipment to protect eyes and face. Shape tungsten electrode on
grinder wearing proper protection and in a safe location. Keep flammables away and prevent fire from flying
sparks.
FUMES, GASSES, AND VAPORS CAN CAUSE DISCOMFORT, ILLNESS, AND DEATH!
To reduce the risk, read, understand, and follow the safety instructions. In addition, make certain that anyone else that
uses this welding equipment or is a bystander in the welding area, understands and follows these safety instructions as
well.
• Read and understand manufacturers Safety Data Sheets (SDS) and Material Safety Data Sheets (MSDS).
• Do not weld in an area until it is checked for adequate ventilation as described in ANSI standard Z49.1. If
ventilation is not adequate to exchange all fumes and gasses generated during the welding process with fresh air, do
not weld unless you (the welder) and all bystanders are wearing air-supplied respirators.
• Do not heat metals coated with, or that contain, materials that produce toxic fumes (such as galvanized steel), unless
the coating is removed. Make certain the area is well ventilated, and the operator and all bystanders are wearing
air-supplied respirators.
• Do not weld, cut or heat lead, zinc, cadmium, mercury, beryllium, antimony, cobalt, manganese, selenium, arsenic,
copper, silver, barium, chromium, vanadium, nickel, or similar metals without seeking professional advice and
inspection of the ventilation of the welding area. These metals produce extremely toxic fumes which can cause
discomfort, illness and death.
• Do not weld or cut in areas that are near chlorinated solvents. Vapors from chlorinated hydrocarbons, such as
trichloroethylene and perchloroethylene, can be decomposed by the heat of an electric arc or its ultraviolet radiation.
These actions can cause phosgene, a highly toxic gas to form, along with other lung and eye- irritating gasses. Do
not weld or cut where these solvent vapors can be drawn into the work area or where the ultraviolet radiation can
penetrate to areas containing even very small amounts of these vapors.
• Do not weld in a confined area unless it is being ventilated or the operator (and anyone else in the area) is wearing
an air-supplied respirator.
• Stop welding if you develop momentary eye, nose, or throat irritation as this indicates inadequate ventilation.
Stop work and take necessary steps to improve ventilation in the welding area. Do not resume welding if physical
discomfort persists.
Fire Prevention
FIRE OR EXPLOSION CAN CAUSE DEATH, INJURY, AND PROPERTY DAMAGE! To reduce these
risks, read, understand and follow the safety instructions. In addition, make certain that anyone else that uses this welding
equipment, or is a bystander in the welding area, understands and follows these safety instructions as well. Remember:
arc welding by nature produces sparks, hot spatter, molten metal drops, hot slag and hot metal parts that can start fires,
burn skin and damage eyes.
• Do not wear gloves or other clothing that contains oil, grease, or other flammable substances.
• Do not wear flammable hair preparations.
• Do not touch the hot weld bead or weld puddle until fully cooled.
• Do not weld in an area until it is checked and cleared of combustible and/or flammable materials. Be aware that
sparks and slag can fly 35 feet and can pass through small cracks and openings. If work and combustibles cannot be
separated by a minimum of 35 feet, protect against ignition with suitable, snug-fitting, fire resistant, covers or shields.
• Do not weld on walls until checking for and removing combustibles touching the other side of the walls.
• Connect the ground cable to the workpiece as close as possible to the welding area. Do not connect ground cables
to building framing or other locations away from the welding area. This increases the possibility of welding current
passing through alternate circuits, creating fire hazards and other safety hazards.
• Do not weld, cut, or perform other such work on used barrels, drums, tanks, or other containers that had a flammable
or toxic substance. The techniques for removing flammable substance and vapors, to make a used container safe for
welding or cutting, are quite complex and require special education and training.
• Do not strike an arc on a compressed gas or air cylinder, and never allow any electrically “hot” parts to touch a
cylinder. Doing so will create a brittle area that can result in a violent rupture immediately or at a later time as a result
of rough handling.
• Ensure any compressed gas cylinders in the work area have properly operating regulators rated for the gas and

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pressure used. All hoses, fittings, etc. should be in good condition.
• Do not stand in front of or put your head or face in front of a cylinder valve outlet when opening the valve.
• If a cylinder is not in use or connected for use, keep a valve protection cap in place to protect the valve.
• Keep cylinders upright and securely chain them to a fixed support to prevent tipping.
• Keep cylinders away from areas where they may be subjected to physical damage or accidentally struck. Keep them
a safe distance from any source of flame, sparks, or heat.
• Do not weld or cut in an area where the air may contain flammable dust (such as grain dust), gas, or liquid vapors
(such as gasoline).
• Do not handle hot metal, such as the workpiece or electrode stubs, with bare hands.
• Wear leather gloves, heavy long sleeve shirt, cuffless pants, high-topped shoes, helmet, and cap. As necessary, use
additional fire-resistant protective clothing to cover and protect the upper and lower body. Hot sparks or metal can
lodge in rolled up sleeves, pant cuffs, or pockets. Sleeves and collars should be kept buttoned and pockets eliminated
from the shirt front.
• Have fire extinguisher equipment handy for immediate use. A portable chemical fire extinguisher, type ABC, is
recommended.
• Wear ear plugs when welding overhead to prevent spatter or slag from falling into ear.
• Make sure welding area has a good, solid, safe floor, preferably concrete or masonry, not tiled, carpeted, or made of
any other flammable material.
• Protect flammable walls, ceilings, and floors with heat resistant covers or shields.
• Check welding area to make sure it is free of sparks, glowing metal or slag, and flames before leaving the welding
area.
• Wear garments free of oil or other flammable substances such as leather gloves, thick cotton shirts with no synthetic
materials, cuffless trousers, closed toed shoes. Keep long hair pulled back.
• Remove any combustibles such as lighters and matches before doing any welding.
• Follow requirements in OSHA and NFPA for hot work and have an extinguisher nearby.
High Frequency Radiation
• High Frequency (H.F) can interfere with radio navigation, safety services, computers and communication equipment.
• It is the user’s responsibility to have a qualified electrician promptly correct any interference problem resulting from the
installation. Electrician should regularly check and maintain installation.
• Stop using the equipment if notified by the FCC about interference.
• Keep H.F. source doors and panels tightly shut and keep spark gaps at correct setting.
Arc Welding
• Computers and computer driven equipment can be harmed with electromagnetic energy.
• Be sure all equipment is compatible with electromagnetic energy.
• Keep welding cables short to reduce interference.
• Follow manual to install and ground machine.
• If interference continues, shield the work area or move the welding machine.
WARNING: ELECTRIC SHOCK CAN KILL! To reduce the risk of death or serious injury from shock, read,
understand, and follow the safety instructions. In addition, make certain that anyone else who uses this welding
equipment, or who is a bystander in the welding area understands and follows these safety instructions as well.
IMPORTANT! TO REDUCE THE RISK OF DEATH, INJURY, OR PROPERTY DAMAGE, DO NOT
ATTEMPT OPERATION of this welding equipment until you have read and understand the following safety summary.
• Do not, in any manner, come into physical contact with any part of the welding current circuit. The welding current
circuit includes:
a. the workpiece or any conductive material in contact with it,
b. the ground clamp,
c. the electrode or welding wire,
Electric Shock

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d. any metal parts on the electrode holder, or MIG gun.
• Do not weld in a damp area or come in contact with a moist or wet surface.
• Do not attempt to weld if any part of clothing or body is wet.
• Do not allow the welding equipment to come in contact with water or moisture.
• Do not drag welding cables, MIG gun, or welder INPUT POWER CABLE through or allow them to come into contact
with water or moisture.
• Do not touch welder, attempt to turn welder ON or OFF if any part of the body or clothing is moist or if you are in
physical contact with water or moisture.
• Do not attempt to plug the welder into the power source if any part of body or clothing is moist, or if you are in
physical contact with water or moisture.
• Do not connect ground clamp to electrical conduit, and do not weld on electrical conduit.
• Do not alter INPUT POWER CABLE or plug in any way.
• Do not attempt to plug the welder into the power source if the ground prong on INPUT POWER CABLE plug is bent
over, broken off, or missing.
• Do not allow the welder to be connected to the power source or attempt to weld if the welder, welding cables,
welding site, or welder INPUT POWER CABLE are exposed to any form of atmospheric precipitation, or salt water
spray.
• Do not carry coiled welding cables around shoulders, or any other part of the body, when they are plugged into the
welder.
• Do not modify any wiring, ground connections, switches, or fuses in this welding equipment.
• Wear welding gloves to help insulate hands from welding circuit.
• Keep all liquid containers far enough away from the welder and work area so that if spilled, the liquid cannot
possibly come in contact with any part of the welder or electrical welding circuit.
• Replace any cracked or damaged parts that are insulated or act as insulators such as welding cables, INPUT POWER
CABLE, or electrode holder immediately.
• When not welding, cut wire back to contact tip or remove electrode from electrode holder
Noise
Noise can cause permanent hearing loss. Welding processes can cause noise levels that exceed safe limits. You must
protect your ears from loud noise to prevent permanent loss of hearing.
• To protect your hearing from loud noise, wear protective ear plugs and/or ear muffs.
• Noise levels should be measured to be sure the decibels (sound) do not exceed safe levels.
Additional Safety Information
For additional information concerning welding safety, refer to the standards listed at the beginning of this safety summary
and comply with them as applicable.

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Primary (Input) Volts 0-12 VDC
Maximum Output Amperage 250A (DC output only)
Rated Output and Duty Cycle 200A @ 60%
Supplied Drive Roll 0.030” and 0.040” Grooves
Recommended Wire Size 0.035” (Compatible with 0.030 - 0.047”)
Wire Speed 800 IPM Max
Recommended Material Aluminum and Stainless Steel Alloys
Coolant Type Air
Dimensions 16” (406,4mm) X 12” (304,8mm) X 3.5” (88,9mm)
Cable Length 20’ (6,09m)
Consumables TWECO Style Series 14H
Weight 11 lbs (Including Power Cable)
BE SURE TO LOCATE THE SPOOL GUN ACCORDING TO THE FOLLOWING GUIDELINES:
• In areas free from moisture and dust;
• In areas with ambient temperature between 30° to 90°F;
• In areas free from oil, steam and corrosive gases;
• In areas not subjected to abnormal vibration or shock;
• In areas not exposed to direct sunlight or rain;
• Place at a distance of 12” or more from walls or similar obstructions that could restrict natural air flow for cooling.
Since the inhalation of welding fumes can be harmful, ensure that the welding area is effectively ventilated. See the
“Safety Summary” for more details (pages 5-9).
FOR YOUR SAFETY, BEFORE CONNECTING THE POWER SOURCE TO THE LINE CLOSELY
FOLLOW THESE INSTRUCTIONS:
• An adequate two-pole breaker must be inserted before the main outlet. This breaker must be equipped with
time-delay fuses.
• When working in a confined space, the welder must be kept outside the welding area and the ground cable
should be fixed to the workpiece. Never work in a damp or wet confined space.
• Do not use damaged INPUT POWER CABLE or welding cables.
• The welding gun/torch/electrode should never be pointed at the operator or other people.
• The welder must never be operated without its panels attached. This could cause serious injury to the operator
and could damage the equipment.
Installation
Spool Gun Specifications
Site Selection
Additional Warnings
Ventilation

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Description
Your new Forney Spool Gun was designed to be rugged, reliable, user-friendly, and ergonomic all at an incredible value.
Rugged and Reliable
Your new spool gun is durable and built for heavy use. The housing is extra thick to handle the wear and tear of use in the
most demanding work environment.
User-Friendly
Whether you’re a novice or an experienced professional, your new spool gun was designed to be easy to use and
enhance the efficiency of your workflow for less down time, and more time getting the job done.
Ergonomic
Your new spool gun is compact, light, and built to offer advanced comfort across several hours of hard work both in and
out-of-position.
Spool Gun Layout and Controls
A) End-of-Torch Consumables – TWECO Style Nozzle (TWECO 23-50), TWECO Style Diffuser (TWECO
52FN), and TWECO Style Contact Tips (TWECO 14H-30 through 14H-47).
B) Torch Neck
C) Torch Neck Nut – The torch neck is removable for maintenance convenience.
D) Spool Gun Trigger – On/Off spool gun control initiates wire feed, gas flow, and arc.
E) Wire Feed Speed Adjustment Knob – Allows the user to adjust wire feed speed between welds. Turning the
knob counterclockwise (or away from the user) increases the wire feed speed, and vice versa.
F) Mechanism Cover Release – Press in on this tab when opening the mechanism cover.
G) Wire Tension Adjustment Knob – This knob applies and releases the tension on the wire feed mechanism.
H) Wire Spool Compartment Cover Release – Pressing down on this lever will open the wire spool
compartment allowing the user access to the welding wire spool.
I) Wire Spool Compartment
Getting to Know Your Spool Gun

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Installing Your Spool Gun
If using a Forney power supply or welding machine, please follow these steps:
• Step 1: Open the rear Euro housing on the end of the power cable that plugs into the welding machine. This is
accomplished by rotating Cap 1 and Cap 2 counterclockwise. This will allow you to remove half of the Euro housing
and access the Model Selector Switch. If using the Forney 190 MP (#324), or Forney 220 MP, the Model Selector
Switch needs to be in the “Off” position. If using a Forney 242 MIG or 270 MIG, the Model Selector Switch needs
to be in the “On” position. Once finished, tuck the switch back inside of the housing and close the cover by re-
installing the removable half of the Euro housing and turning both caps clockwise until they seat into position.
• Step 2: Ensure that your power supply or welding machine is turned off.
• Step 3: Ensuring proper alignment, thread the machine end of the spool gun power cable into the Euro Connect
receptacle on the front of your welding machine.
• Step 4: Ensuring proper alignment, thread the 7-pin Amphenol™ connector into the Amphenol™ socket on the front
of your welding machine. TIP: The Amphenol™ plug of your spool gun has an alignment notch. When installed
correctly, this notch will be at the top center of the Amphenol™ socket.
If your welding machine or power supply does not have automatic accessory recognition capabilities:
• Step 5: Inside the cabinet of your Forney welding machine, locate a red switch with “remote” and “local” options.
To operate a spool gun, this switch must be set to “remote.” If this has been done correctly, the machine will display
“SPE.”
If using a power supply or welding machine that was not manufactured by Forney Industries:
• Please refer to your power supply or welding machine manufacturer’s instructions.

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WARNING: Cylinders are highly pressurized. Handle with care. Serious accidents can result from improper handling
or misuse of compressed gas cylinders. Do not drop the cylinder, knock it over, expose it to excessive heat, flames or
sparks. Do not strike it against other cylinders or strike an arc on it.
Installing the Welding Wire
ENSURE GAS AND ELECTRICAL SUPPLIES ARE DISCONNECTED. Before proceeding,
remove the nozzle and the contact tip from the spool gun.
WARNING: ELECTRIC SHOCK CAN KILL! Always turn the ON/OFF SWITCH to the OFF position and
unplug the welder’s INPUT POWER CABLE from the AC power source before installing wire. When the gun
trigger is depressed, the drive rolls, spool of wire, wire being fed, and electrode are all electrically live (hot).
Step 1:
• Open the Wire Spool Compartment: Press down on the back of the Wire Spool Compartment Cover
Release (H) to swing the Wire Spool Compartment (I) cover down and open.
Gas Cylinder and Regulator Connection
The gas cylinder (not supplied) should be located near the rear of the welder. It should be in a well-ventilated area and
securely fixed to the work bench or to the wall to ensure it will not fall.
For safety and economy, ensure that the regulator is fully closed (turned counterclockwise) when not in use and when
fitting or removing the gas cylinder.
• Turn the regulator adjustment knob counterclockwise to ensure the valve is fully closed.
• Screw the gas regulator down on the gas bottle valve and tighten.
• Connect the gas hose to the regulator, securing with the clip/nut provided.
• Connect the other end to the GAS INPUT on the back of the machine. If multiple GAS INPUT ports are present on the
back of your Forney welding machine, use the port that is designated for MIG welding.
• Open the cylinder valve, then set the gas flow to approximately 20 - 35 CFH (cubic ft. per hour) on the regulator.
• To verify that the cylinder was installed properly, depress the spool gun trigger to ensure that the gas is flowing
through the gun.

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Step 4: Press in on the Mechanism Cover Release (F) to open the cover. Rotate the cover all the way forward
out of the way. Rotate the Wire Tension Adjustment Knob (G) counterclockwise to unlock the tension
mechanism. Rotate the entire Wire Tension Adjustment Knob armature upward to release the Idler Arm (K).
Step 3: Install the spool of wire on the main shaft ensuring that the wire is feeding from the bottom of the spool.
Insert the free end of the wire into the wire inlet guide at the base of the spool compartment. Re-install Wire
Spool Retention Nut (J).
Step 2:
• Remove the Wire Spool Retention Nut (J) (Shown Below):

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• Rotate the Idler Arm (K) inward into position and rotate the Tension Adjustment Knob Armature downward
until it engages the Idler Arm.
• Ensure that the welding wire is centered in the lower groove of the drive roller.
Step 6: Apply drive tension by rotating the Tension Adjustment Knob (G) clockwise until snug.
• TIP: More tension is not better! Use as little drive tension as possible while still feeding wire smoothly
and continuously.
Step 7: Close mechanism and wire spool compartment covers.
Step 8: Verify this setup by depressing the spool gun trigger.
• Depressing the trigger should feed wire through the torch neck and out the nozzle of the spool gun.
Feed several inches to ensure smooth operation.
Step 5: Feed the free end of the wire through the wire feed mechanism until it enters the inlet guide of the torch
neck.

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Drive Roll Groove Selection
• Your Forney spool gun can be used with multiple welding wire sizes. It’s important to use the drive roll groove that
corresponds to the wire diameter that you will use.
• Always ensure that the wire is being fed through the bottom groove of the drive roller to avoid possible birds nesting
issues.
• When installed in the spool gun, there will be a size visibly engraved in the drive roll that represents the groove being
used. The size that is present represents the bottom of the drive roll:
Changing the Drive Roller
To remove or install the drive roller onto your Forney spool gun, simply remove the thumb screw (L) from the top of the
drive axle. Once the thumb screw is removed, the roller is free to slide on and off the axle:

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Operation
Welding Preparation
Factors to Consider for Best MIG Welding Results
An important factor in making a satisfactory weld is preparation. This includes studying the process and equipment
and practicing welding before attempting to weld finished product. An organized, safe, comfortable, and well-lit work
area should be prepared for the operator. The work area should specifically be free of all flammables with both a fire
extinguisher and a bucket of sand available.
To properly prepare for welding with your new spool gun, it is necessary to:
• Read the safety precautions at the front of this manual.
• Prepare an organized, well-lit work area.
• Provide protection for the eyes and skin of the operator and bystanders.
• Attach the ground clamp to the bare metal to be welded, making sure of good contact.
• Make sure that the wire-roller groove corresponds to the diameter of wire being used.
• Plug the machine into a suitable outlet.
• Completely open the gas cylinder valve. Adjust the gas pressure regulator to the correct flow rate.
EXPOSURE TO A WELDING ARC IS EXTREMELY HARMFUL TO THE EYES AND SKIN. PROLONGED
EXPOSURE TO A WELDING ARC CAN CAUSE BLINDNESS AND BURNS. NEVER STRIKE AN ARC OR
BEGIN WELDING UNLESS YOU ARE ADEQUATELY PROTECTED. WEAR FIRE RESISTANT WELDING
GLOVES, HEAVY LONG-SLEEVED SHIRT, CUFF-LESS PANTS; HIGH TOPPED SHOES AND A WELDING
HELMET.
Some experience is required to adjust and use a MIG welder. In MIG welding, two parameters are fundamental: the
welding voltage and the wire feed speed. The resulting welding current is a result of these two settings but is more directly
related to the wire feed speed.
• Set the voltage (LEFT KNOB) and wire feed speed (RIGHT KNOB) to positions suitable for the thickness of the material
to be welded. Welding current varies in relationship to wire feed speed. For low wire feed speed (RIGHT KNOB),
welding current output will be low. Turning the wire feed speed control clockwise will result in increased wire feed
speed and welding current. Welding voltage should be adjusted to match the wire feed speed/welding current.
Progressively select higher voltage positions when increasing wire speed.
Increasing welding voltage leads to a longer arc (without substantially affecting the current). Conversely, a decreased
welding voltage results in a shorter arc (the current again is not substantially changed). A change in wire diameter results
in changed parameters. A larger diameter wire will draw a higher current than a smaller diameter wire at the same wire
feed speed. If certain limits are exceeded, a satisfactory weld cannot be obtained. These are:
1. Feeding wire too fast (too high speed with regard to the welding voltage) results in pulsing within the gun. This is
because the wire electrode dips into the puddle and cannot be melted off fast enough.
2. Setting welding voltage too high (too high with regard to the wire feed speed), will result in excessive and unstable
arc. Increase the voltage even higher and the contact tip will burn.
3. Excessive wire speed can be corrected through the arc voltage increase. The limit of this adjustment depends on the
thickness of the material to be welded (a certain limit exceeded will result in burn through).
Place the gun on the joint you want to weld: the angle between the gun and the workpiece should be around 45°. The
distance between the gun and the workpiece should be about 1/2” - 5/8.” Lower your face shield and press the gun
trigger to start the arc. When the arc has struck, move the nozzle slowly from left to right along the joint. Adjust the wire
feed speed until the arc makes a “crisp” sound (experience will help you to recognize the right sound).

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Adjusting Machine Settings
When using your new spool gun on a power supply or welding machine that was manufactured by Forney Industries:
• The left knob on the front of your welding machine will control the voltage of the weld.
• The right knob on the front of your welding machine will control the wire feed speed.
• Depending on the model of your Forney welding machine, the wire feed speed control knob on the spool gun
will either:
1. Allow the user to scroll through the entire wire feed speed range from 0 to 100% of the capability of the welding
machine (rendering the wire feed speed knob on the front of the welding machine useless).
2. Allow for fine control, giving the user ± 10% of the wire feed speed that is set using the knob on the front of the
welding machine.
When using your new spool gun on a power supply or welding machine that was not manufactured by Forney Industries:
• Please refer to the welding machine manufacturer’s instructions.
The following machine settings are to be used as baseline data. User experimentation and practice is encouraged to learn
the true capabilities of your welder.
Push Vs. Pull
When MIG welding aluminum with a spool gun, it is very important that the user “push” rather than “pull” the weld. This
ensures adequate shielding gas coverage for the weld zone and will dramatically improve weld appearance and quality:

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Basic MIG Settings for 4XXX Series Aluminum
Wire Diameter Material Thickness Voltage (V) Wire Feed Speed (IPM)
0.030”
22 GA 13.5 200
20 GA 13.5 240
18 GA 14.5 290
16 GA 15.5 340
14 GA 16.5 370
12 GA 17.5 425
1/8” 25 450
3/16” 25 500
1/4” 28.5 550
3/8” 29 600
0.035”
22 GA 13.5 150
20 GA 13.5 180
18 GA 14 220
16 GA 15 250
14 GA 15 270
12 GA 17 325
1/8” 25 410
3/16” 25 450
1/4” 27 525
3/8” 28 550
1/2” 29 600
0.047”
1/8” 20.5 200
3/16” 20.5 220
1/4” 27.8 250
3/8” 27.5 260
1/2” 28 280
3/4” 30 290
Always use 100% Pure Argon when welding Aluminum

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This spool gun has been engineered to need minimal service providing that a few very simple steps are taken to properly
maintain it.
1. Keep the spool cover and tension mechanism cover closed at all times unless the wire needs to be changed or the drive
pressure needs adjusting.
2. Keep all consumables (contact tips, nozzles, and liner) clean and replace when necessary. See “Consumable
Maintenance” (below) and “Troubleshooting” for detailed information.
3. Avoid directing grinding particles towards the spool gun. These conductive particles can build up inside the spool gun
and cause severe damage.
4. Periodically clean dust, dirt, grease, etc. from your equipment.
WARNING: DISCONNECT FROM POWER SOURCE WHEN CARRYING OUT THIS OPERATION.
5. The wire feed drive roller will eventually wear during normal use. With the correct pressure, the idler roller must feed the
wire without slipping. If the grooves in the wire feed drive roller are worn deep enough that the idler roller and the wire
feed drive roller make contact when the wire is in place between them, the wire feed drive roller must be replaced.
6. Check all cables periodically. They must be in good condition and not cracked.
WARNING: ELECTRIC SHOCK CAN KILL! Be aware that the ON/OFF SWITCH, when OFF, does not remove
power from all internal circuitry in the welder. To reduce the risk of electric shock, always unplug the welder from its AC
power source and wait several minutes for electrical energy to discharge before removing side panels
IT IS VERY IMPORTANT TO MAINTAIN THE CONSUMABLES TO AVOID THE NEED FOR
PREMATURE REPLACEMENT OF THE GUN ASSEMBLY.
MAINTAINING THE CONTACT TIP:
The purpose of the CONTACT TIP is to transfer welding current to the welding wire while allowing the wire to pass through it
smoothly.
Always use a contact tip that is stamped one size larger in diameter than the welding wire it will be used with.
1. If the wire burns back into the tip, remove the tip from the gun and clean the hole running through it with an oxygen-
acetylene torch tip cleaner or tip drill. If the burned-back wire cannot be removed, the tip will have to be replaced.
2. With extended use over time, this hole will become worn. Increased wear on the hole causes increased resistance in the
transfer of welding current from the contact tip to the wire. This will result in less stable arc characteristics and difficult
arc starting.
CAUTION: KEEP THE NOZZLE CLEAN!
During the welding process, spatter and slag will build up inside the nozzle and must be cleaned out periodically. Failure
to clean and/or replace the nozzle in a timely fashion will cause damage to the front end of the gun assembly, which is not
replaceable. The results of the inaction may require the replacement of the entire gun assembly.
Failure to keep the nozzle adequately cleaned can result in the following problems:
A shorted nozzle results when spatter buildup bridges across the insulation in the nozzle allowing welding current to flow
through it as well as the contact tip. When shorted, a nozzle will steal welding current from the wire whenever it contacts the
grounded workpiece. This causes erratic welds and reduced penetration. In addition, a shorted nozzle overheats the end of
the gun which can damage the front-end of the gun.
TESTING FOR A SHORTED NOZZLE
Arcing between the nozzle and the workpiece always means the nozzle is shorted, but this can be hard to detect through the
lens of a welding helmet. The following testing method is another way to tell if a nozzle is shorted.
With the welder unplugged from the AC power source, touch the probes of an ohmmeter or continuity tester to the end of the
contact tip and the outside of the nozzle. If there is any continuity at all, the nozzle is shorted. Clean or replace as needed.
Maintenance & Servicing
General Maintenance