Lincoln Electric LF-72, LF-74 User Manual
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
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
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
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