Page 1
24-42
VAC
60
50
Hz
SEMIAUTOMATIC WIRE FEEDERS
LF-72 and LF-74 Wire Feeders
2-Roll or 4-Roll Heavy Duty Industrial Feeders
Output
Designed for MIG and cored wire welding in job shop and manufacturing
environments, the rugged LF-72 and LF-74 wire feeders are built to
deliver reliable performance day after day. The heart of these feeders
is the highly engineered 2-roll or 4-roll MAXTRAC™ wire drive
system, delivering strong and consistent feeding force for tough
applications.
Select the 2-roll LF-72 for most .035-.045 wire applications.
Select the 4-roll LF-74 for large diameter wires, longer
gun cables or long boom conduit or hard automation
applications.
Processes
MIG, Pulsed, Flux-Cored
LF-74 Bench Model, Heavy Duty, Extra Torque, K2426-3
LF-72 Bench Model, Standard Duty, K2327-2
(Shown with optional wire.)
Advantage Lincoln
• Patented MAXTRAC™ heavy-duty cast aluminum wire drive system
provides reliable feeding and durability.
• Brass-to-brass gun connections for better electrical conductivity that
results in better arc performance.
• Totally tool-less drive rolls and wire guide installation. Two or four
gear-driven wire drive rolls slide on and off easily!
• Calibrated wire feed speed dial for precise and accurate settings.
• Rugged, industrial-grade wire feeder motor.
or
Input
• In addition to great mild steel performance, these feeders deliver
positive arc starting and feeding with stainless steel, aluminum and
flux-cored wires!
• Control cable connector with a Spin-Nut™ makes connecting the
control cable a simple twist-of-the-wrist.
• Totally enclosed wire drive.
• Manufactured under a quality system certified ISO 9001
requirements and ISO 14001 environmental standards.
• Three-year warranty on parts and labor.
Product Product Input Output Capacity Speed Range Range H x W x D Weight
(1)
Name
LF-72 Base Model K2327-1 24-42 VAC 500 Amps @ 60% 50-800 Solid Cored 11.1 x 10.2 x 12.9 44
(with gun) 50/60 Hz 400 Amps@ 100% (1.3-20.3) .023-1/16 .030-5/64 (282 x 259 x 328) (20)
•
LF-72 Base Model, K2327-4 27
(no gun, no cable) (12)
LF-72 Bench Model, K2327-2 12.6 x 10.9 x 22.5 53
Standard Duty (320 x 277x 572) (24)
LF-72 Bench Model, K2327-3 15.3 x 13.0 x 27.7 68
Heavy Duty (389 x 330 x 704) (31)
LF-74 Base Model K2426-1 600 Amps @ 60% 100-800 .030-5/64 11.1 x 10.2 x 12.9 46
LF-74 Bench Model, K2426-2 15.3 x 13.0 x 27.7 71
Heavy Duty (389 x 330 x 704) (32)
LF-74 Bench Model, K2426-3 50-400 .030-3/32 71
Heavy Duty, Extra Torque (1.3-10.1) (0.8-2.4) (32)
(1)
See selection guide on page 4.
TECHNICAL SPECIFICATIONS
Wire Feed Wire Size Dimensions Net
Number Power Current / Duty Cycle ipm (m/min) in (mm) in (mm) lbs (kg)
9 Amps (0.6-1.6) (0.8-2.0)
500 Amps@ 100% (2.5-20.3) (0.8-2.0) (282 x 259 x 328) (21)
Publication E8.11 8/06
www.lincolnelectric.com
Page 2
A CLOSER LOOK
PERFORMANCE
F
F
D
E
A
B
C
LF-74 Four Roll Drive
Rigid Cast Aluminum Frame
A
• Enhances precise drive roll
alignment
Brass to Brass Interchangeable
B
Gun Bushings
• More reliable electrical
conductivity – no oxide
build-up
• More efficient energy transfer –
lower voltage drops
• Easily adapt any number
of Lincoln Magnum or
competitive guns
G
New Patent-Pending Drive Rolls
C
• For steel - new design delivers
20% more feeding force
• For aluminum - chrome plated
to resist build-up
Twist-Lock Drive Roll Hubs
D
• Two or four gear driven rolls
• Fast, tool-less changeovers
Patented Split Wire Guides
E
• Full support for wire throughout
the drive path
• Removable outer wire guide for
easy access
• No tools required
• No birdnesting
LF-72 Two Roll Drive
Patent-Pending Dual Spring
F
Pressure Arm
• Easy turn numeric tension
indicator
• Set heavy tension for steel
and stainless
• Set moderate tension for cored
wires
• Set soft tension for aluminum
• Wide idler arm hinge delivers
improved drive roll clamping
pressure
Separate Drive Gear
G
• Reduces pressure on motor for
extended service life
[2]
LF-72/LF-74 Wire Feeders
www.lincolnelectric.com
Page 3
A CLOSER LOOK
FEATURES
Heavy Duty hinged door opens upward to
provide generous access to wire drive.
Convenient storage tray on top for
contact tips and drive rolls.
Calibrated Wire Feed Speed Dial for precise setting.
Convenient 2 Step/Trigger Interlock Switch
for operator comfort during long welds.
Cold Feed for safety/Gas Purge clears
shielding gas line.
Front View
LF-74 Four Roll Bench Model Shown
H
(optional)
G
(optional)
Rugged MAXTRAC™ wire drive system.
Gas Hose Connection Inlet.
Control Cable Connector with Spin-Nut™
for fast, easy, tool-less connection.
Patented Ball Bearing Inlet
Guide for accurate feeding.
A
B
Back View
Key Controls (LF-72 and LF-74)
A ) Calibrated Wire Feed Speed Dial
B ) Gun Connection (K1500-2)
C ) 5-Pin Gun Connection
D ) Motor Thermal Protection Light
E ) Cold Feed/Gas Purge Switch
F ) 2-Step/Trigger Interlock Switch
G) Burnback/Postflow Timer Kit (optional)
H ) Remote Voltage Control Kit (optional)
F
E
D
C
[3]
LF-72 shown with optional K2330-1 Postflow and Burnback Timer Kit
and K2329-1 Remote Voltage Control Kit.
LF-72/LF-74 Wire Feeders
www.lincolnelectric.com
Page 4
SYSTEM SELECTION
•
WIRE FEEDER SELECTION GUIDE
Number of Rolls:
LF-72
LF-74 LF-74 Extra Torque
Inches Per Minute
(m/min):
Wire Size, in. (mm):
BASE MODEL
no gun, no cable
For boom mounting
or for use with
bulk consumables.
BASE MODEL
For boom mounting
or for use with
bulk consumables.
BENCH MODEL
STANDARD DUTY
For most welding
needs that require a
rugged and
dependable wire
feed system.
BENCH MODEL
HEAVY DUTY
For applications
requiring up to 60 lb.
wire packages.
50-800
(1.3-20.3)
Solid
Cored
Unit Includes:
• Drive Roll and
Wire Guide Kit
Unit Includes:
• Drive Roll and
Wire Guide Kit
• Gun and Cable
Assembly
• Control Cable
10' (3m)
Unit Includes:
• Drive Roll and
Wire Guide Kit
• Gun and Cable
Assembly
• Control Cable
10' (3m)
LF-72 Bench Model, Standard Duty (K2327-2)
Unit Includes:
• Drive Roll and
Wire Guide Kit
• Gun and Cable
Assembly
• Control Cable
10' (3m)
.023-1/16 (0.6-1.6)
.030-5/64 (0.8-2.0)
LF-72 Base Model (no gun, no cable)
10-44 lb. (4.5-19.9 kg) wire spool.
(K2327-4)
LF-72 Base Model with gun
(K2327-1)
Shown with optional
Solid
Cored
Unit Includes:
• Drive Roll and
Wire Guide Kit
• Control Cable
10' (3m)
Unit Includes:
• Drive Roll and
Wire Guide Kit
• Control Cable
10' (3m)
.023-1/16 (0.6-1.6) .023-1/16 (0.6-1.6)
.030-5/64 (0.8-2.0) .030-3/32 (0.8-2.4)
100-800
(2.5-20.3)
LF-74 Base Model (K2426-1)
Solid
Cored
Unit Includes:
• Drive Roll and
Wire Guide Kit
• Control Cable
10' (3m)
50-400
(1.3-10.1)
Recommended for
Flux-Cored
Wire Feeding
LF-72 Bench Model, Heavy Duty (K2327-3)
Shown with optional 50-60 lb.
(22.6-27.2 kg) coil adapter and wire.
LF-72 includes FREE:
(1)
LF-74 Bench Model, Heavy Duty (K2426-2)
.035"-.045" (0.9-1.2mm) Drive Roll and
Wire Guide Kit (KP1696-1)
Male 14-pin to Female 14-pin Control Cable
10 ft. (3.0m) (K1797-10)
Magnum 400 Gun and 15 ft. (4.5m) Cable
Assembly with .035"- .045" (0.9mm-1.2mm)
liner (K471-21). LF-72 Base Model without
gun also available (K2327-4).
(1)
K2327-4 includes Drive Roll & Wire Guide Kit Only
Shown with optional 50-60 lb.
(22.6-27.2 kg) coil adapter and wire.
[4]
LF-74 Bench Model, Heavy Duty,
Extra Torque (K2426-3)
Shown with optional 50-60 lb.
(22.6-27.2 kg) coil adapter and wire.
LF-74 includes FREE:
.035"/.045" (0.9mm/1.2mm) Drive Rolls
and Wire Guides
Male 14-pin to Female 14-pin
Control Cable 10 ft. (3.0m) (K1797-10)
LF-72/LF-74 Wire Feeders
www.lincolnelectric.com
Page 5
OPTIONS
DRIVE ROLL & WIRE GUIDE KITS
Description LF-72 Two-Roll LF-74 Four-Roll
Steel Wire Sizes (includes stainless steel):
.023-.030" (0.6-0.8mm) KP1696-030S KP1505-030S
.035" (0.9mm) KP1696-035S KP1505-035S
.045" (1.2mm) KP1696-045S KP1505-045S
.052" (1.4mm) KP1696-052S KP1505-052S
.035", .045" (0.9, 1.2mm) KP1696-1
.040" (1.0mm) KP1696-2 –
1/16" (1.6mm) KP1696-1/16S KP1505-1/16S
Cored Wire Sizes:
.030-.035" (0.8-0.9mm) KP1697-035C KP1505-035C
.040-.045" (1.0-1.2mm) KP1697-045C KP1505-045C
.052" (1.4mm) KP1697-052C KP1505-052C
1/16" (1.6mm) KP1697-1/16C KP1505-1/16C
Steel or Cored Wire Sizes:
.068-.072" (1.8mm) KP1697-068 KP1505-068
5/64" (2.0mm) KP1697-5/64 KP1505-5/64
3/32" (2.4mm) – KP1505-3/32
Aluminum Wire Sizes:
.035" (0.9mm) KP1695-035A KP1507-035A
.040" (1.0mm) KP1695-040A KP1507-040A
3/64" (1.2mm) KP1695-3/64A KP1507-3/64A
1/16" (1.6mm) KP1695-1/16A KP1507-1/16A
(1)
Standard on LF-72.
(1)
–
CONTROL EXTENSION CABLES
Cable Type Description
Wire Feeder Control Extension Cables
K1797-10 - 10 ft
K1797-25 - 25 ft.
K1797-50 - 50 ft.
K1797-100 - 100 ft.
(1)
Standard with all LF-72 (except K2327-4) and LF-74 models.
(1)
.
Male 14-pin to female 14-pin
WELD POWER CABLE REQUIRED
WELD POWER CABLES
Order No. Description
K1840-10 Twist-Mate™ to Lug, 1/0, 350A, 60% duty cycle, 10 ft.
K1842-10 Lug to Lug, 3/0, 600A, 60% duty cycle, 10 ft.
K1842-35 Lug to Lug, 3/0, 600A, 60% duty cycle, 35 ft.
K1842-60 Lug to Lug, 3/0, 600A, 60% duty cycle, 60 ft.
K1842-110 Lug to Lug, 4/0, 600A, 60% duty cycle, 110 ft.
K1500-1 Gun
Receiver Bushing
(Optional)
• Magnum 200, 300
and 400 gun and
cable assemblies
with K466-1
connector kit.
• Lincoln Innershield
gun and cable
assembly.
• Magnum 550 gun
and cable assembly
with K613-1
connector kit.
K1500-2 Gun
Receiver Bushing
(Standard)
• Magnum 200 and
400 fully assembled
guns (K497-2x and
K471-2x).
• Magnum 200, 300
and 400 gun and
cable assemblies
with K466-10
connector kit.
• Guns with Tweco #2,
#3, and #4
connectors.
FEED PLATE GUN RECEIVER BUSHINGS
K1500-3 Gun
Receiver Bushing
(Optional)
• Magnum 550 gun
and cable assembly
with K613-7
connection.
• Guns with Tweco
#5 connectors.
K1500-4 Gun
Receiver Bushing
(Optional)
• Magnum 200, 300
and 400 gun and
cable assemblies
with K466-3
connector kit.
K1500-5 Gun
Receiver Bushing
(Optional)
• To adapt to OXO
guns.
K489-7 Fast-Mate
Gun Receiver
Bushing (Optional)
• Magnum gun and
cable assemblies
with Fast-Mate
connections.
• Handles both
single and dual
procedure guns.
[5]
LF-72/LF-74 Wire Feeders
www.lincolnelectric.com
Page 6
OPTIONS
GENERAL OPTIONS
Magnum Gas-Shielded Gun and
Cable Assemblies
Available 200-550 amps, aircooled, gas-shielded welding guns.
See publication E12.10
Magnum Self-Shielded Gun and
Cable Assemblies
Available 250-600 amps.
See publication E12.110
Postflow and Burnback
Timer Kit
Provides adjustable delay of power
source output shut off to prevent
electrode sticking in crater when
using high wire feed speeds.
Order K2330-1
Remote Voltage Control Kit
Allows arc voltage to be changed
at the feeder.
Order K2329-1
Incoming Bushing for Lincoln
Conduit
Feed Plate Incoming Bushings
connect directly to wire conduit (not
included), for use in boom system,
long distances, or large payoff
packages. Bushings can be used
with any wire conduit (K515 or
K565).
Order K1546-1 for .025-1/16" wire
Order K1546-2 for 1/16-1/8" wire
Spindle Adapter
for Readi-Reels® and Spools
For fixture and other custom
installations. Features 2" (51mm)
O.D. spindle for mounting ReadiReels and 2" (51mm) I.D. spools up
to 60 lb. (27.2 kg) capacity.
Order K162-1
Deluxe Adjustable Gas Regulator
& Hose Kit
Accommodates CO2, Argon, or
Argon-blend gas cylinders. Includes
a cylinder pressure gauge, dual
scale flow gauge and 4.3 ft. (1.3m)
gas hose.
Order K586-1
Gas Guard Regulator
For CO2and Argon blend gases.
Reduces surge caused by excess
pressure in supply hose. Includes
adjustable flow regulator with
removable adjuster key.
Order K659-1
Adapter for Competitive Power
Sources
Allows wire feeder to connect to
select Miller Electric® power
sources.
Order K2335-1
Control Cable to Terminal Strip
Adapter
Connects 14-pin control cable to
power sources with terminal strip.
Order K1798
115V/42V Transformer Kit
Provides a way to use the wire
feeder on power sources that have
115V AC available on the terminal
strip.
Order K1520-1
Welding Fume Extractors
Lincoln offers a wide variety of
welding fume extraction
environmental system solutions,
ranging from portable systems
easily wheeled around the shop to
shop-wide central systems
servicing many dedicated welding
stations.
Request Publication E13.40
ADDITIONAL OPTIONS FOR
BASE MODEL (Does not
include Wire Reel Stand)
Standard Duty Wire Reel Stand
For use with Lincoln 10-44 lb.
(4.5-20 kg) wire packages that use
a 2" (51mm) spindle.
Order K2328-1
Heavy Duty Wire Reel Stand
For use with Lincoln 10-60 lb.
(4.5-27.2 kg) wire packages that
use a 2" (51mm) spindle. Hole in
stand fits over lift bail.
Order K1524-3
6000 Series Welding Arm
Create a safe, uncluttered work
environment where floor space is
used effectively with a Lincoln
Series 6000 Welding Arm. Glide
the arm effortlessly into position
when in use or swing it
conveniently against a wall or
beam for safe, out-of-the-way
storage. An 18" x 18" (457 x
457mm) footprint ties up very little
floor space.
Order K1778-1
•
•
Harris Argon Flowmeter/
Regulator and Hose Kit
Order 3100211
LF-72/LF-74 Wire Feeders
[6]
www.lincolnelectric.com
Page 7
OPTIONS
ADDITIONAL OPTIONS FOR
FEEDERS EQUIPPED WITH
STANDARD DUTY WIRE
REEL STAND
Lift Bail Kit
Allows the entire wire feeder to be
hung from a crane or hook. Use
with Standard Duty Wire Reel
Stand.
Order K2331-1
Lightweight Swivel Kit
Allows wire feeder to freely turn. For
use with Standard Duty Wire Reel
Stand.
Order K2332-1
Undercarriage
Includes mounting frame, front
casters, rear wheels and handle for
hand towing. For use with Wire Reel
Stands.
Order K163
14 lb. Innershield® Coil Adapter
Permits 14 lb. (6 kg) Innershield
electrode coils to be mounted on 2"
(51mm) O.D. spindles.
Order K435
8" O.D. Spool Adapter
Permits 8" (200mm) O.D. spools to
be mounted on 2" (51mm) O.D.
spindles.
Order K468
Wire Reel Cover Kit
Plastic enclosure for up to 44 lb.
(20 kg) wire packages.
Order K1634-1
ADDITIONAL OPTIONS FOR
FEEDERS EQUIPPED WITH
HEAVY DUTY WIRE REEL
STAND
Insulated Lift Bail
Allows the entire wire feeder to be
hung from a crane or hook. Use
with Heavy Duty Wire Reel Stand.
Order K1555-1
Swivel Platform
Mounts to the lift bail on the power
source and bottom of the Heavy
Duty Wire Reel stand. Wire feeder
may be lifted off if needed.
Compatible with Light Duty Caster
Kit. Includes “lazy susan” parts tray.
Order K1557-1
Undercarriage
Includes mounting frame, front
casters, rear wheels and handle for
hand towing. For use with Wire Reel
Stands.
Order K163
14 lb. Innershield® Coil Adapter
Permits 14 lb. (6 kg) Innershield
electrode coils to be mounted on 2"
(51mm) O.D. spindles.
Order K435
8" O.D. Spool Adapter
Permits 8" (200mm) O.D. spools to
be mounted on 2" (51mm) O.D.
spindles.
Order K468
Wire Reel Cover Kit
Plastic enclosure for up to 44 lb.
(20 kg) wire packages.
Order K1634-1
50-60 lb. Readi-Reel® Adapter
Adapts 60 lb. (27.2 kg) coils of
Lincoln electrode to 2" (51mm)
spindle.
Order K438
50-60 lb. Coil Adapter
Adapts 50-60 lb. (22.6-27.2 kg) coils
of Lincoln electrode to
2" (51mm) spindle.
Order K1504-1
Plastic Wire Cover Kit
Plastic enclosure for up to 60 lb.
(27.2 kg) wire packages.
Order K1634-2
Caster Kit — Light Duty
Mounts to the Heavy Duty Wire
Reel Stand. Allows for easy
movement of wire feeder.
Order K1556-1
[7]
NOTE:
Miller Electric® is not a trademark
of The Lincoln Electric Company.
LF-72/LF-74 Wire Feeders
www.lincolnelectric.com
Page 8
LF-72 AND LF-74 WIRE FEEDERS ORDER FORM
PRODUCT DESCRIPTION ORDER NUMBER QUANTITY PRICE
LF-72 WIRE FEEDER, BASE MODEL, WITH GUN K2327-1
LF-72 WIRE FEEDER, BASE MODEL, NO GUN, NO CABLE K2327-4
LF-72 WIRE FEEDER, BENCH MODEL, STANDARD DUTY K2327-2
LF-72 WIRE FEEDER, BENCH MODEL, HEAVY DUTY K2327-3
LF-74 WIRE FEEDER, BASE MODEL K2426-1
LF-74 WIRE FEEDER, BENCH MODEL, HEAVY DUTY K2426-2
LF-74 WIRE FEEDER, BENCH MODEL, HEAVY DUTY, EXTRA TORQUE K2426-3
UNIT REQUIRES
Weld Power Cable See page 5
Magnum Gas-Shielded Gun and Cable Assemblies See publication E12.10
Magnum Self-Shielded Gun and Cable Assemblies See publication E12.110
GENERAL OPTIONS
Postflow and Burnback Timer Kit K2330-1
Remote Voltage Control Kit K2329-1
Incoming Bushing for Lincoln Conduit:
for .025-1/16" wire K1546-1
for 1/16-1/8" wire K1546-2
Spindle Adapter K162-1
Deluxe Adjustable Gas Regulator & Hose Kit K586-1
Gas Guard Regulator K659-1
Harris Argon Flowmeter/Regulator & Hose Kit 3100211
Adapter for Competitive Power Sources K2335-1
Control Cable to Terminal Strip Adapter K1798
115V/42V Transformer Kit K1520-1
Welding Fume Extractors See publication E13.40
ADDITIONAL OPTIONS FOR BASE MODEL
(Does Not Include Wire Reel Stand)
Standard Duty Wire Reel Stand K2328-1
Heavy Duty Wire Reel Stand K1524-3
6000 Series Welding Arm K1778-1
ADDITIONAL OPTIONS FOR FEEDERS EQUIPPED WITH
STANDARD DUTY WIRE REEL STAND
Lift Bail Kit K2331-1
Lightweight Swivel Kit K2332-1
Undercarriage K163
14 lb. Innershield® Coils Adapter K435
8" O.D. Spool Adapter K468
Wire Reel Cover Kit (for up to 44 lb. wire packages) K1634-1
ADDITIONAL OPTIONS FOR FEEDERS EQUIPPED WITH
UNIVERSAL WIRE REEL STAND
Insulated Lift Bail K1555-1
Caster Kit – Light Duty K1556-1
Swivel Platform K1557-1
Undercarriage K163
14 lb. Innershield® Coils Adapter K435
8" O.D. Spool Adapter K468
Wire Reel Cover Kit (for up to 44 lb. wire packages) K1634-1
50-60 lb. Readi-Reel® Adapter K438
50-60 lb.Coil Adapter K1504-1
Plastic Wire Cover Kit (for up to 60 lb. wire packages) K1634-2
POWER SOURCE OPTIONS
CV-305, CV400-I, CV-400, CV500-I, CV-655, Invertec® V350-PRO, See publications E4.22, E4.20.1,
Invertec® V450-PRO, DC-400, DC-600, DC-655 E4.30, E4.30.1,E4.40, E5.91,
E5.94, E5.20, E5.40, E5.46
TOTAL:
The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment, consumables, and cutting equipment. Our challenge is to meet the needs of our customers and to exceed
their expectations. On occasion, purchasers may ask Lincoln Electric for advice or information about their use of our products. We respond to our customers based on the best information in our possession at that time.
Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability, with respect to such information or advice. We expressly disclaim any warranty of any kind, including any warranty of
fitness for any customer’s particular purpose, with respect to such information or advice. As a matter of practical consideration, we also cannot assume any responsibility for updating or correcting any such information
or advice once it has been given, nor does the provision of information or advice create, expand or alter any warranty with respect to the sale of our products.
Lincoln Electric is a responsive manufacturer, but the selection and use of specific products sold by Lincoln Electric is solely within the control of, and remains the sole responsibility of the customer. Many variables
beyond the control of Lincoln Electric affect the results obtained in applying these types of fabrication methods and service requirements.
Subject to Change – This information is accurate to the best of our knowledge at the time of printing. Please refer to www.lincolnelectric.com for any updated information.
CUSTOMER ASSISTANCE POLICY
THE LINCOLN ELECTRIC COMPANY
22801 St. Clair Ave., Cleveland, OH 44117-1199 • 216.481.8100 • www.lincolnelectric.com
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