240 Volt arc/tIG
INVErtEr wEldEr
aNd tIG wEldING torch
Model 66787
SEt up aNd opEratING INStructIoNS
Visit our website at: http://www.harborfreight.com
read this material before using this product.
Failure to do so can result in serious injury.
SaVE thIS MaNual.
©
®
Copyright 2009 by Harbor Freight Tools . All rights reserved. No portion of this manual or any artwork
contained herein may be reproduced in any shape or form without the express written consent of
Harbor Freight Tools. Diagrams within this manual may not be drawn proportionally. Due to continuing
improvements, actual product may differ slightly from the product described herein. Tools required for
assembly and service may not be included.
For technical questions or replacement parts, please call 1-800-444-3353.
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NotIcE is used to
address practices
not related to personal injury.
SaVE thIS MaNual
Keep this manual for the safety warn-
ings and precautions, assembly, operating,
inspection, maintenance and cleaning pro-
cedures. Write the product’s serial number
in the back of the manual (or month and
year of purchase if product has no num-
ber). Keep this manual and the receipt in
a safe and dry place for future reference.
cautIoN, without
the safety alert
symbol, is used to address
practices not related to
personal injury.
IMportaNt SaFEtY
INForMatIoN
In this manual, on the labeling,
and all other information provid-
ed with this product:
General Safety rules
warNING! read all instructions
Failure to follow all instructions
listed below may result in
electric shock, fire, and/or
serious injury. The term “power
tool” in all of the warnings listed
below refers to your line-operated
(corded) ARC/TIG Inverter Welder.
this is the safety alert
symbol. It is used to alert
you to potential personal
injury hazards. obey all
safety messages that
SaVE thESE INStructIoNS
follow this symbol to avoid
possible injury or death.
1. work area safety
a. Keep work area clean and well lit.
Cluttered or dark areas invite acci-
dents.
daNGEr indicates
a hazardous
situation which, if not
avoided, will result in death or
serious injury.
b. Do not operate power tools in ex-
plosive atmospheres, such as in
the presence of flammable liquids,
gases or dust. Power tools create
sparks which may ignite the dust or
fumes.
warNING
indicates a
hazardous situation which, if
not avoided, could result in
death or serious injury.
c. Keep children and bystanders away
while operating a power tool. Dis-
tractions can cause you to lose
control.
cautIoN, used
with the safety
alert symbol, indicates a
hazardous situation which, if
not avoided, could result in
minor or moderate injury.
2. Electrical safety
a. Avoid body contact with grounded
surfaces such as pipes, radiators,
ranges and refrigerators. There is
an increased risk of electric shock if
your body is grounded.
SKU 66787
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b. Do not expose power tools to rain
or wet conditions. Water entering a
power tool will increase the risk of
electric shock.
4. power tool use and care
a. Do not force the power tool. Use the
correct power tool for your applica-
tion. The correct power tool will do
the job better and safer at the rate
for which it was designed.
c. Do not abuse the cord. Never use
the cord for pulling or unplugging the
power tool. Keep cord away from
heat, oil, sharp edges or moving
parts. Damaged or entangled cords
increase the risk of electric shock.
b. Do not use the power tool if the
switch does not turn it on and off.
Any power tool that cannot be con-
trolled with the switch is dangerous
and must be repaired.
d. When operating a power tool out-
doors, use an extension cord suit-
able for outdoor use. Use of a cord
suitable for outdoor use reduces the
risk of electric shock.
c. Disconnect the plug from the power
source before making any adjust-
ments, changing accessories, or
storing power tools. Such preventive
safety measures reduce the risk of
starting the power tool accidentally.
3. personal safety
a. Stay alert, watch what you are do-
ing and use common sense when
operating a power tool. Do not use
a power tool while you are tired or
under the influence of drugs, alcohol
or medication. A moment of inatten-
tion while operating power tools may
result in serious personal injury.
d. Store idle power tools out of the
reach of children and do not allow
persons unfamiliar with the power
tool or these instructions to oper-
ate the power tool. Power tools are
dangerous in the hands of untrained
users.
e. Maintain power tools. Check for
misalignment or binding of moving
parts, breakage of parts and any
other condition that may affect the
power tool’s operation. If damaged,
have the power tool repaired before
use. Many accidents are caused by
poorly maintained power tools.
b. Use safety equipment. Always wear
eye protection. Safety equipment
such as arc shaded, impact safety
full face shield, dust mask or respi-
rator, heavy-duty work gloves, non-
skid safety shoes, or hearing protec-
tion used for appropriate conditions
will reduce personal injuries.
f. Use the power tool and its acces-
sories in accordance with these
instructions and in the manner
intended for the particular type of
power tool, taking into account the
working conditions and the work to
be performed. Use of the power tool
for operations different from those
intended could result in a hazardous
situation.
c. Avoid accidental starting. Ensure
the switch is in the off-position be-
fore plugging in. Carrying power
tools with your finger on the switch
or plugging in power tools that have
the switch on invites accidents.
d. Do not overreach. Keep proper foot-
ing and balance at all times. This
enables better control of the power
tool in unexpected situations.
SKU 66787
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5. Service
a. Have your power tool serviced by
5. Avoid eye and body damage. Arc
rays and infrared radiation can injure
eyes and burn skin. Wear ANSI ap-
proved eye and body protection. Do
not allow viewing by visitors without
proper eye and body protection. Use
a Face Shield with arc shaded filter
plate.
a qualified repair person using only
identical replacement parts. This will
ensure that the safety of the power
tool is maintained.
Specific Safety Rules
6. Move flammable and explosive mate-
rial at least 35 feet from the welding
arc to prevent welding sparks or mol-
ten metal from starting a fire. Keep a
type ABC fire extinguisher within easy
reach. Thoroughly clean the object
being welded of any paint, grease, or
other foreign material.
1. Maintain labels and nameplates on
the tool. These carry important safety
information. If unreadable or miss-
ing, contact Harbor Freight Tools for a
replacement.
2. Do not touch the tip of the Torch
when the welder is connected to
power. The Torch will immediately
activate when it is plugged in. The
operator must carefully direct the
torch whenever the welder is con-
nected to power. When the operator
is not holding the Torch, it must be
sitting on a nonconductive, nonflam-
mable surface.
7. Avoid unintentional starting. Prepare
to begin work before turning on the
Welder.
8. Do not leave the Welder unattended
when it is plugged into an electrical
outlet. Turn off the tool, and unplug it
from its electrical outlet before leav-
ing.
3. Feed the filler metal being used into
the arc with a properly insulated
holder.
9. Use clamps (not included) or other
practical ways to secure and support
the work piece to a stable platform.
Holding the work by hand or against
your body is unstable and may lead
to loss of control.
4. Avoid electrical shock. Do not per-
mit electrically live parts, cables, or
electrodes to contact skin, clothing, or
gloves. Wear ANSI-approved protec-
tive clothing. This unit draws enough
current to cause serious injury or
death. Before turning the Welder on,
check the electrode holder to be sure
that there are no protruding screw
heads, and that all insulation is se-
cure. Do not weld unless you are
insulated from ground and the work
piece.
10. This product is not a toy. Keep it out
of reach of children.
11. Industrial applications must follow
OSHA guidelines.
12. People with pacemakers should
consult their physician(s) before use.
Electromagnetic fields in close prox-
imity to heart pacemaker could cause
pacemaker interference or pacemak-
er failure. In addition, people with
pacemakers should:
Rev 09h
SKU 66787
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• Avoid operating alone.
• Do not use with power switch locked
on.
• Properly maintain and inspect to
avoid electrical shock.
• Any power cord must be properly
grounded. Ground Fault Circuit Inter-
rupter (GFCI) should also be imple-
mented – it prevents sustained elec-
trical shock.
approved for welding and cutting
procedures.
• When welding/cutting overhead
or in confined spaces, wear flame
resistant ear plugs or ear muffs to
keep sparks out of ears.
15.
Prevent accidental fires.
Remove any combustible
material from the work
area.
13. WARNING: This product, when used
for welding, produces chemicals
known to the State of California to
cause cancer and birth defects (or
other reproductive harm). (California
Health & Safety Code § 25249.5, et
seq.)
• When possible, move the work to a
location well away from combustible
materials. If relocation is not pos-
sible, protect the combustibles with
a cover made of fire resistant mate-
rial.
• Remove or make safe all combus-
tible materials for a radius of 35 feet
(10 meters) around the work area.
Use a fire resistant material to cover
or block all open doorways, win-
dows, cracks, and other openings.
14.
Prevent eye injury and
burns. Wearing and using
ANSI-approved personal
safety clothing and safety
devices reduce the risk for
injury.
• Enclose the work area with por-
table fire resistant screens. Protect
combustible walls, ceilings, floors,
etc., from sparks and heat with fire
resistant covers.
• Wear ANSI-approved safety impact
eye glasses underneath welding
eye protection featuring at least a
Number 10 shade lens rating.
• Leather leggings, fire resistant
shoes or boots should be worn
when using this product. Do not
wear pants with cuffs, shirts with
open pockets, or any clothing that
can catch and hold molten metal or
sparks.
• If working on a metal wall, ceiling,
etc., prevent ignition of combus-
tibles on the other side by moving
the combustibles to a safe loca-
tion. If relocation of combustibles
is not possible, designate someone
to serve as a fire watch, equipped
with a fire extinguisher, during the
cutting process and for at least one
half hour after the cutting is com-
pleted.
• Keep clothing free of grease, oil,
solvents, or any flammable sub-
stances. Wear dry, insulating gloves
and protective clothing.
• Wear an approved head covering
to protect the head and neck. Use
aprons, cape, sleeves, shoulder
covers, and bibs designed and
• Do not weld or cut on materials
having a combustible coating or
combustible internal structure, as
in walls or ceilings, without an ap-
Rev 09h
SKU 66787
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proved method for eliminating the
hazard.
18. Ensure that the unit is placed on a
stable location before use. If this unit
falls while plugged in, severe injury,
electric shock, or fire may result.
• Do not dispose of hot slag in con-
tainers holding combustible materi-
als. Keep a fire extinguisher nearby
and know how to use it.
19. Ground this product. This Welder
requires the attachment and use of
a ul-listed, 240 volt, grounded,
3-prong, electrical power cord
plug (not included). Only a qualified
electrician should install the Power
Cord Plug. Never remove the ground-
ing prong or modify the Power Cord
Plug in any way. Do not use adapter
plugs with this product.
• After spot welding, make a thorough
examination for evidence of fire. Be
aware that easily-visible smoke or
flame may not be present for some
time after the fire has started. Do
not weld or cut in atmospheres
containing dangerously reactive or
flammable gases, vapors, liquids,
and dust. Provide adequate ven-
tilation in work areas to prevent
accumulation of flammable gases,
vapors, and dust. Do not apply
heat to a container that has held an
unknown substance or a combus-
tible material whose contents, when
heated, can produce flammable or
explosive vapors. Clean and purge
containers before applying heat.
Vent closed containers, including
castings, before preheating, weld-
ing, or cutting.
20. Avoid overexposure to fumes and
gases. Always keep your head out
of the fumes. Do not breathe the
fumes. Use enough ventilation or
exhaust, or both, to keep fumes and
gases from your breathing zone and
general area.
• Where ventilation is questionable,
have a qualified technician take
an air sampling to determine the
need for corrective measures. Use
mechanical ventilation to improve
air quality. If engineering controls
are not feasible, use an approved
respirator.
16. Do not touch live electrical parts.
Wear dry, insulating gloves. Do not
touch electrode or conductor tong
with bare hand. Do not wear wet or
damaged gloves.
• Follow OSHA guidelines for Permis-
sible Exposure Limits (PEL’s) for
various fumes and gases.
17. Protect yourself from electric shock.
Do not use outdoors. Insulate your-
self from the work piece and ground.
Use nonflammable, dry insulating
material if possible, or use dry rubber
mats, dry wood or plywood, or other
dry insulating material big enough to
cover your full area of contact with
the work or ground.
• Follow the American Conference
of Governmental Industrial Hygien-
ists recommendations for Threshold
Limit Values (TLV’s) for fumes and
gases.
• Have a recognized specialist in
Industrial Hygiene or Environmental
Services check the operation and
air quality and make recommenda-
Rev 09h
SKU 66787
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tions for the specific welding or cut- 23. The warnings, precautions, and in-
ting situation.
structions discussed in this instruction
manual cannot cover all possible con-
ditions and situations that may occur.
It must be understood by the operator
that common sense and caution are
factors which cannot be built into this
product, but must be supplied by the
operator.
21. WARNING: Handling the Power
Cord on this product will expose you
to lead, a chemical known to the
State of California to cause cancer,
birth defects, and other reproductive
harm. Wash hands after handling.
(California Health & Safety Code §
25249.5 et seq.)
SaVE thESE
warNING
INStructIoNS.
INhalatIoN hazard:
welding and plasma cutting produce
toxIc FuMES.
Exposure to welding or cutting
exhaust fumes can increase the risk
of developing certain cancers, such as
cancer of the larynx and lung cancer.
Also, some diseases that may be linked
to exposure to welding or plasma cutting
exhaust fumes are:
• Early onset of Parkinson’s Disease
• Heart disease
• Ulcers
• Damage to the reproductive organs
• Inflammation of the small intestine or
stomach
• Kidney damage
• Respiratory diseases such as
emphysema, bronchitis, or pneumonia
Use natural or forced air ventilation and
wear a respirator approved by NIOSH to
protect against the fumes produced to
reduce the risk of developing the above
illnesses.
REV 09e; 09h
SKU 66787
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torch aSSEMBlY
1. when assembling torch, make
sure torch cable is not connected
to welder or argon gas supply.
SpEcIFIcatIoNS
240V~ / 60 Hz / 25A max.
Electrical
Power Cord: SJT 12AWG x 3C
Requirements Power Plug: 3-Prong, 240 VAC
(Not Included)
Output
Amperage
Range
(Back)
(Front)
10-130 Amps
61V
rod
Maximum
Open Circuit
Voltage
ceramic
holder
Nozzle
(3a/3b)
(2a)
40% @ 130 Amps
60% @ 120 Amps
100% @ 80 Amps
Duty Cycle
Gas Flow
Knob
Maximum
Welding
Capacity
handle
1/4” - For Welding Steel Only
Electrode
Diameter
Capacity
For Use With
1/16”, 3/32” and 1/8” Diameter
Rods
2. Thread either Rod Holder (2a) or Plug
(6a) securely into back of Torch (1a).
Electrode
Holder Head
Ground Cable 65”
75”
3. Choose a matching set of Collet and
Collet Holder, either 1/16” (4a & 5a)
or 3/32” (4b & 5b), depending on the
rod to be used. Insert the Collet, nar-
rower end first, into the Collet Holder,
and then thread the Collet Holder
loosely into the front of the Torch.
Torch Cable
Length
12’ 9”
Gas Hose
8’ 6” L, 0.34” OD, .19” ID
May be used for both arc and tig
welding.
Quick starting with high open
voltage.
4. Place a prepared tungsten welding
rod (the correct diameter for the Col-
let used) into Collet. Tighten Collet
Holder in place.
Additional
Features
Anti-Stick circuit works with
rutile, basic steel, stainless
steel, and cast iron electrodes.
Additional amperage during
short arc length conditions
increases electrode penetration.
5. Attach desired Ceramic Nozzle (3a or
3b) onto Collet Holder. do not over-
tighten. Ceramic Nozzles of larger
sizes will contain shielding gas in a
larger area, but may require more gas
flow to be effective.
uNpacKING
When unpacking, check to make sure
that the item is intact and undamaged. If
any parts are missing or broken, please
call Harbor Freight Tools at the number
shown on the cover of this manual as soon
as possible.
6. Connect the gas hose securely to the
regulator on the argon bottle. Set the
argon regulator to 18-22 PSI. Fol-
low the gas cylinder manufacturer’s
instructions for set-up and use.
Note: For TIG Welding Torch Parts
List and Diagram, refer to page 17.
7. Connect the cable to the Welder.
Twist to lock in place.
REV 09h, 09l
SKU 66787
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wEldEr FEaturES
1. Electrode holder (8): Connect the
Electrode Holder Cable to the POSI-
TIVE Terminal located at the front of
the Welder. (See Figure a.)
2. Ground clamp (9): Connect the
Ground Clamp Cable to the NEGATIVE
Terminal located on the front of the
Welder. (See Figure a.)
3. potentiometer dial (4): Turn the Dial
clockwise or counterclockwise to regu-
late the welding current (from 10 to 130
amps). (See Figure B.)
4. Green “power on” light (5): When
illuminated, indicates the Welder is
receiving electrical power and is ready
for use. (See Figure B.)
5. Yellow “overheating” light (5):
When illuminated, indicates overheat-
ing caused by an excessively intense
duty cycle. In this case, stop welding
and wait until the welder has cooled
down. The welder will automatically
restart after the yellow “overheating”
light turns off.(See Figure B.)
6. Fan (14): The Fan must operate con-
tinuously when operating the Welder to
prevent the unit from overheating.
(See Figure c.)
7. power Switch (16): The Power Switch
must illuminate before welding opera-
tions can begin.
(See Figure c.)
8. tig welder torch
REV 09h
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work piece and work area Set up
opEratING INStructIoNS
1. Designate a work area that is clean
and well-lit. The work area must not
allow access by children or pets to
prevent injury and distraction.
read the ENtIrE IMportaNt
SaFEtY INForMatIoN section
at the beginning of this manual
including all text under
subheadings therein before set
up or use of this product.
2. Route the Power Cord (17) along a
safe route to reach the work area
without creating a tripping hazard
or exposing the Power Cord to pos-
sible damage. The Power Cord must
reach the work area with enough
extra length to allow free movement
while working.
Note: For additional information regarding
the parts listed in the following pages,
refer to the Assembly Diagram near
the end of this manual.
tool Set up
3. Secure loose work pieces using a
vise or clamps (not included) to pre-
vent movement while working. The
work pieces should be firmly held to-
gether and in position while welding.
The distance (if any) between the
two work pieces must be controlled
properly to allow the weld to hold
both sides securely while allowing the
weld to penetrate fully into the joint.
to prEVENt
SErIouS INjurY
FroM accIdENtal
warNING
opEratIoN:
turn the switch to its off
position before performing
any inspection, maintenance,
or cleaning procedures.
1. IMPORTANT: This Welder requires
®
the attachment and use of a ul
4. There must not be hazardous ob-
jects, such as utility lines or foreign
objects, nearby that will present a
hazard while working.
listed, 240 volt, grounded, 3-prong,
electrical power cord plug (not
included). Only a qualified electrician
should install the Power Cord Plug.
Never remove the grounding prong or
modify the Plug in any way. Do not
use adapter plugs with this Welder.
5. A barrier, such as a welding curtain
or welding shroud should be put up
to protect others in the work area and
limit the spray of sparks.
2. Connect the Ground Clamp (9) Cable
to the NEGATIVE (-) terminal.
(See Figure a.)
General operating Instructions
please Note: the
3. Connect the Electrode Holder (8)
Cable to the POSITIVE (+) terminal.
(See Figure a.)
daNGEr
following
instructions are for arc
welding using the Electrode
holder
REV 09h
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protective gear must be worn
when using the welder; aNSI-
approved, arc shaded, eye
protection, a full face shield,
heavy duty work gloves, a
welding apron, respirator,
and heavy-duty work clothes
without pockets should be
worn when using this product.
do not look at the ignited
arc without eye protection.
light from the arc can cause
permanent damage to the
eyes. light from the arc can
burn the skin. do not breathe
arc fumes.
ed so that the welding debris falls to
the cement floor.
3. Place the Welder no closer than six
feet from the workpiece to be welded
and attach the Tig Torch, if desired.
4. Securely attach the Ground Clamp
(9) to a part of the workpiece or metal
table. (See Figure a.)
5. Place the bare end of an Electrode
(not included) in the Electrode Holder
(8). NOTE: Always keep the jaws of
the Electrode Holder clean to ensure
proper electrical contact with the
Electrode. (See Figure a.)
6. Set the desired current on the Poten-
tiometer Dial (4) from 10 to130 amps
for the type of metal being welded.
Thin metals use low current and
heavy metals use high current.
(See Figure B.)
1. The duty cycle defines the number
of minutes, within a 10 minute period,
during which a given Welder can
safely produce a particular welding
current. For example, this Welder,
with a 40% duty cycle at 130 Amps
(maximum setting), must be allowed
to rest for at least 6 minutes after
every 4 minutes of continuous weld
at 130 Amps.
7. Make sure the Power Switch (16) is
oFF. Then plug the Welder’s Power
Cord (17) into the nearest 240 volt,
dedicated, grounded, electrical outlet
with delayed action type circuit break-
er or fuse. (See Figure c.)
• Failure to carefully observe duty cy-
cle limitations can stress a Welder’s
power generation system, contribut-
ing to premature Welder failure.
8. While gripping the Handle of the
Electrode Holder (8), with the Elec-
trode clear of grounded objects, turn
the Power Switch (16) oN.
• This Welder is equipped with an
internal thermal protection system
to help prevent damage to the unit.
When the unit overheats; it auto-
matically shuts down, then returns
to service when it cools down.
(See Figure c.)
9. Hold the Electrode Holder (8) firmly.
cautIoN! The Electrode Holder is
“live”. (See Figure a.)
• Once the unit returns to service, fol-
low a more conservative duty cycle
routine to help prevent excess wear
to the Welder.
10. warNING! Never look at the ignited
arc without ANSI-approved, arc shad-
ed, eye protection in a full face shield.
Permanent eye damage or blindness
can occur. Skin burns can occur.
2. Mount the metal to be welded to the
metal work table. It should be mount-
REV 09h
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Wear a NIOSH-approved respirator
to avoid breathing arc fumes.
of children and other unauthorized
persons.
11. Stroke the area to be welded with the 18. IMPORTANT: Refer to the included
Electrode to ignite the arc. Never tap
the Electrode into the welding sur-
face to ignite the arc. This damages
its external coating on the Electrode
which prevents oxygen in the air from
coming into contact with the molten
metal, causing it to oxidize.
“Weld Diagnoses” pamphlet for tips
and suggestions regarding proper
welding.
tIG torch operating Instructions
please Note: the
following
daNGEr
12. Once the arc is ignited, tilt the Elec-
trode forward at an angle of approxi-
mately 30° and hold it at a distance
from the welding object equal to the
diameter of the Electrode.
instructions are for tig
welding using the tig torch.
to prEVENt SErIouS
INjurY aNd dEath:
do not touch the tip of the
torch when the welder is
connected to power. the
torch will immediately
activate when it is plugged in.
the operator must carefully
direct the torch whenever
the welder is connected to
power. when the operator is
not holding the torch, it must
be sitting on a nonconductive,
nonflammable surface.
Feed the filler metal being
used into the arc with a
properly insulated holder (not
included).
13. NotE: If too much current is drawn
from the Welder, the internal Thermal
Overload Protector will activate. The
Yellow “Overheating” Light (5) will
illuminate, and the Welder will auto-
matically shut off until it cools down.
Please wait until the welder automati-
cally restarts after the yellow “over-
heating” light turns off.
(See Figures B and c.)
14. When the weld is complete, lift the
Electrode clearly away from any
grounded object. Then turn the
Power Switch (16) oFF.
(See Figure c.)
1. To use Tig Torch, first disconnect
15. Unplug the Power Cord (17) from its
electrical outlet.
Electrode Holder (8).
2. Attach the welder’s Ground Clamp
to a clean uncoated metal part of the
workpiece near the welding location.
16. Remove the Ground Clamp (9) from
the workpiece it is clamped onto.
Then remove the Electrode from the
Electrode Holder (8).
3. Close the Gas Flow Knob on the
torch completely, turning it clockwise
until it stops. Turn the argon gas sup-
ply on.
(See Figure a.)
17. Allow all components of the Welder
to completely cool. Then clean and
store the Welder indoors out of reach
4. hold the torch in a safe direction,
plug the welder’s power cord into a
REV 09h
SKU 66787
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grounded, 240 V~, GFCI-protected
receptacle and turn the Welder on.
to prEVENt SErIouS
INjurY FroM tool
FaIlurE: do not use
5. Turn the Gas Flow Knob on the torch
counterclockwise to allow the shield-
ing gas to flow.
damaged equipment. If
abnormal noise or vibration
occurs, have the problem
corrected before further use.
6. Tilt the torch forward, towards the
workpiece. Keep a constant distance
between the torch and the workpiece
but do not contact it.
1. BEFORE EACH USE, inspect the
general condition of the Welder.
Check for loose screws, misalignment
or binding of moving parts, cracked
electrode holder head or other broken
parts, damaged electrical wiring, and
any other condition that may affect its
safe operation.
7. Feed the filler metal into the arc
with a properly insulated holder
(not included).
8. Turn Gas Flow Knob on TIG torch to
adjust the flow of shielding gas.
2. PERIODICALLY, clean out the cool-
ing Vent (15) and Fan (14) with com-
pressed air.
9. After welding, hold Torch in a safe di-
rection, turn off the welder, close the
Gas Flow Knob on the torch (clock-
wise), and unplug the welder. Then,
place the torch on a nonconductive,
nonflammable surface, and close the
argon supply at the argon bottle.
3. The Ceramic Nozzle (3a/3b) on the
Tig Torch will occasionally need to
be cleaned of spatter from welding.
Clean it with a metal brush. When
the nozzle deteriorates or can no
longer be cleaned, it will need to be
replaced. Unscrew the nozzle and
replace it with a new one.
MaINtENaNcE aNd
SErVIcING
4. For welding quality and ability,
maintain a point on the tip.
Procedures not specifically
explained in this manual
must be performed only by a
qualified technician.
5. AFTER USE, clean external surfaces
of the Welder with a clean cloth.
to prEVENt
SErIouS INjurY
FroM accIdENtal
opEratIoN: turn the power
Switch (16) of the welder to
its “oFF” position and unplug
the tool from its electrical
outlet before performing any
inspection, maintenance, or
cleaning procedures.
warNING
6.
warNING! If the Power Cord (17)
of this Welder is damaged, it must be
replaced only by a qualified service
technician.
REV 09h
SKU 66787
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trouBlEShootING
problem
possible cause(s)
likely Solution(s)
Welder will not turn on.
1. No power at electrical outlet.
2. Power Cord not connected.
1. Check power at electrical outlet.
2. Check that Power Cord is plugged
in.
3. Line voltage incorrect.
1. Weld Cable loose.
3. Make sure the Welder is plugged
into a 240VAC electrical outlet.
No weld output with
ready light on.
1. Tighten Weld Cable connection at
Welder.
2. Improper Ground Clamp-to-
workpiece connection.
2. Make sure the area where the
Ground Clamp is attached is
clean, exposed metal, and free of
dirt, paint, and oil.
No weld output with high 1. Welder overheated.
temperature light on.
1. Allow unit to cool with Fan on.
2. Reduce duty cycle or amps.
2. Duty cycle or amps too high.
3. Airflow is blocked.
3. Clean Vents and Fan out with
compressed air.
Erratic or improper arc or 1. Bad connections.
1. Clean and tighten all connections.
2. Connect polarity correctly.
3. Clean workpiece thoroughly.
1. Remove obstruction.
welding output.
2. Polarity incorrect.
3. Workpiece painted or dirty.
1. Fan blocked.
Fan not operating.
2. Fan dirty.
2. Clean out Fan with compressed
air.
3. Fan burnt out.
3. Have the Fan replaced by a
qualified service technician.
Main supply fuse shuts
off frequently.
1. Circuit Breaker is too low
amperage.
1. Install a dedicated 25 amp Circuit
Breaker.
Follow all safety precautions whenever diagnosing or servicing the
welder. disconnect power supply before servicing.
REV 09h
SKU 66787
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wEldEr partS lISt aNd aSSEMBlY dIaGraM
part #
description
Qty.
1
part #
11
description
Transformer
Qty.
1
1
2
Housing
Strap
1
12
Heat Sink
3
3
Potentiometer
Potentiometer Dial
LED Light
1
13
Tapping Screw (4.2 x 9.5)
Fan
14
2
4
1
14
5
2
15
Cooling Vent
Power Switch
Power Cord
PCB Support
Cable Clip
1
6
Quick Connector
Inductor
2
16
1
7
1
17
1
8
Electrode Holder
Ground Clamp
Steel Base
1
18
1
9
1
19
1
10
1
20
PCB
1
REV 09h
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tIG torch partS lISt aNd aSSEMBlY dIaGraM
part
description
Qty.
1a Torch and Cable
1
1
1
1
1
1
1
1
1
2a Rod Holder
3a Ceramic Nozzle size 5
3b Ceramic Nozzle size 6
4a Collet Holder 1.6 mm (1/16”)
4b Collet Holder 2.4 mm (3/32”)
5a Collet 1.6 mm (1/16”)
5b Collet 2.4 mm (3/32”)
6a Plug
1a
3a 4a 5a
2a
3b 4b 5b
6a
plEaSE rEad thE FollowING carEFullY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY
DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT
HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS
QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/OR
DISTRIBUTOR ExPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD BE
UNDERTAKEN BY CERTIFIEDAND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE BUYER
ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE ORIGINAL
PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER INSTALLATION
OF REPLACEMENT PARTS THERETO.
REV 09h
SKU 66787
For technical questions, please call 1-800-444-3353.
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lIMItEd 90 daY warraNtY
Harbor Freight Tools Co. makes every effort to assure that its products meet high
quality and durability standards, and warrants to the original purchaser that this prod-
uct is free from defects in materials and workmanship for the period of 90 days from
the date of purchase. This warranty does not apply to damage due directly or indirectly,
to misuse, abuse, negligence or accidents, repairs or alterations outside our facilities,
criminal activity, improper installation, normal wear and tear, or to lack of maintenance.
We shall in no event be liable for death, injuries to persons or property, or for incidental,
contingent, special or consequential damages arising from the use of our product. Some
states do not allow the exclusion or limitation of incidental or consequential damages, so
the above limitation of exclusion may not apply to you. THIS WARRANTY IS ExPRESS-
LY IN LIEU OF ALL OTHER WARRANTIES, ExPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the com-
plaint must accompany the merchandise. If our inspection verifies the defect, we will ei-
ther repair or replace the product at our election or we may elect to refund the purchase
price if we cannot readily and quickly provide you with a replacement. We will return re-
paired products at our expense, but if we determine there is no defect, or that the defect
resulted from causes not within the scope of our warranty, then you must bear the cost
of returning the product.
This warranty gives you specific legal rights and you may also have other rights
which vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
record product’s Serial Number here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not avail-
able individually as replacement parts.
SKU 66787
For technical questions, please call 1-800-444-3353.
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