SEMIAUTOMATIC WIRE FEEDERS
LF-72 and LF-74 Wire Feeders 
Output
2-Roll or 4-Roll Heavy Duty
Designed for MIG and cored wire welding in job shop and environments, the rugged LF-72 and LF-74 wire feeders are deliver reliable performance day after day. The heart of these is the highly engineered 2-roll or 4-roll MAXTRAC™ wire drive system, delivering strong and consistent feeding force for 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.
or
Processes
MIG, Pulsed, Flux-Cored
LF-74 Bench Model, Heavy
LF-72 Bench Model,
(Shown with
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.
•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.
TECHNICAL SPECIFICATIONS
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Wire Feed |
Wire Size |
Dimensions |
Net |
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Product |
Product |
Input |
Output Capacity |
Speed Range |
Range |
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H x W x D |
Weight |
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Name(1) |
Number |
Power |
Current / Duty Cycle |
ipm (m/min) |
in (mm) |
in (mm) |
lbs (kg) |
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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 |
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(with gun) |
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50/60 Hz |
400 Amps@ 100% |
(1.3-20.3) |
.023-1/16 |
.030-5/64 |
(282 x 259 x 328) |
(20) |
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LF-72 Base Model, |
K2327-4 |
9 Amps |
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(0.6-1.6) |
(0.8-2.0) |
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27 |
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(no gun, no cable) |
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(12) |
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LF-72 Bench Model, |
K2327-2 |
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12.6 x 10.9 x 22.5 |
53 |
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Standard Duty |
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(320 x 277x 572) |
(24) |
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LF-72 Bench Model, |
K2327-3 |
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15.3 x 13.0 x 27.7 |
68 |
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Heavy Duty |
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(389 x 330 x 704) |
(31) |
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LF-74 Base Model |
K2426-1 |
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600 Amps @ 60% |
100-800 |
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.030-5/64 |
11.1 x 10.2 x 12.9 |
46 |
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500 Amps@ 100% |
(2.5-20.3) |
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(0.8-2.0) |
(282 x 259 x 328) |
(21) |
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LF-74 Bench Model, |
K2426-2 |
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15.3 x 13.0 x 27.7 |
71 |
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Heavy Duty |
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(389 x 330 x 704) |
(32) |
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LF-74 Bench Model, |
K2426-3 |
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50-400 |
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.030-3/32 |
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71 |
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Heavy Duty, Extra Torque |
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(1.3-10.1) |
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(0.8-2.4) |
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(32) |
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(1) See selection guide on page 4.
Publication E8.11 8/06
www.lincolnelectric.com
A CLOSER LOOK
PERFORMANCE
F
F
D
E
A
B
C
G
LF-74 Four Roll Drive
LF-72 Two Roll Drive
A Rigid Cast Aluminum Frame |
C |
•Enhances precise drive roll alignment
BBrass to Brass Interchangeable Gun Bushings
• More reliable electrical |
D |
conductivity – no oxide |
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build-up |
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•More efficient energy transfer – lower voltage drops
• Easily adapt any number |
E |
of Lincoln Magnum or |
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competitive guns |
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New Patent-Pending Drive Rolls
•For steel - new design delivers 20% more feeding force
•For aluminum - chrome plated to resist build-up
Twist-Lock Drive Roll Hubs
•Two or four gear driven rolls
•Fast, tool-less changeovers
Patented Split Wire Guides
•Full support for wire throughout the drive path
•Removable outer wire guide for easy access
•No tools required
•No birdnesting
FPatent-Pending Dual Spring 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
GSeparate Drive Gear
•Reduces pressure on motor for extended service life
LF-72/LF-74 Wire Feeders
[2] |
www.lincolnelectric.com |
A CLOSER LOOK
FEATURES
Front View
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.
Rugged MAXTRAC™ wire drive system.
Gas Hose Connection Inlet.
LF-74 Four Roll Bench Model Shown
Back View
Control Cable Connector with Spin-Nut™ 
for fast, easy, tool-less connection.
Patented Ball Bearing Inlet
Guide for accurate feeding.
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H |
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A |
Key Controls (LF-72 and LF-74) |
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A ) |
Calibrated Wire Feed Speed Dial |
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(optional) |
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B ) Gun Connection (K1500-2) |
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C ) 5-Pin Gun Connection |
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D ) |
Motor Thermal Protection Light |
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G |
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E ) Cold Feed/Gas Purge Switch |
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B |
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F ) |
2-Step/Trigger Interlock Switch |
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(optional) |
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G) |
Burnback/Postflow Timer Kit (optional) |
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H ) |
Remote Voltage Control Kit (optional) |
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LF-72 shown with optional K2330-1 Postflow and Burnback Timer Kit |
F |
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and K2329-1 Remote Voltage Control Kit. |
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E D C
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LF-72/LF-74 Wire Feeders |
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[3] |
www.lincolnelectric.com |
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