Key | Lincoln Electric LF-72/74 specification

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C-5

ACCESSORIES

C-5

OPTIONAL KITS:

Includes: Cover, backing

K1634-1

Plastic Wire Cover for 30-44 lb.

plate, wire conduit, incoming

(13.6 - 20.0 kg) Wire packages.

bushing for .025 - 1/16" (0.6 -

(For use with Standard Duty

1.6 mm) wire, incoming bush-

Bench Models and Heavy Duty

ing for 1/16" - 1/8" (1.6 - 3.2

Bench Models.)

mm) wire, thumb screw,

mounting hardware and hex

key.

K1634-2

Plastic Wire Cover for up to 60 lb.

(27.2kg) Wire packages. (For use

with Heavy Duty Bench Models.)

K659-1

Gas Guard Regulator

Includes: Gas Guard

Regulator and adjustment key.

Includes: Gas Regulator for

3000290

Adjustable Gas Regulator

Mixed Gases and 10' (3.0m)

Hose.

Includes: Deluxe Gas

K586-1

Deluxe Adjustable Gas Regulator

Regulator for Mixed Gases,

Adapter for CO2 and 10'

(3.0m) Hose.

K1524-3

Heavy Duty Universal Wire Reel

Includes: Heavy Duty Wire

Stand. For spools up to 60 lb.

Reel Stand.

(27.2kg)

4 Wheeled Wire Feeder

Includes: Undercarriage with

K163

Undercarriage (For use with

8" (203mm) rear wheels, 4"

Standard Duty Bench Models and

(102mm)casters.

Heavy Duty Bench Models.)

K1557-1

Swivel Platform (for use with

Includes: Swivel Platform and

Heavy Duty Bench Models)

Tray.

K1556-1

Light Duty Caster Kit (for use with

Includes: 2 Swivel Casters, 2

Heavy Duty Bench Models)

Fixed Casters, brackets and

mounting hardware.

Insulated Lift Bail

Includes: Insulated Lift Bail

K1555-1

(for use with Heavy Duty Bench

and mounting hardware.

Models)

LF-72/74

Image 37

Lincoln Electric LF-72/74 service manual Key

Contents

LF-72/74 Safety Electric Shock can kill Iii Welding Sparks can cause fire or explosion Sûreté Pour Soudage a L’Arc Précautions DE Sûreté Master Table of Contents for ALL Sections Installation Section Table of ContentsSection A-1 Amp Rating Duty Cycle Installation Location Safety PrecautionMounting Swivel Mount Bench MountBoom Mount Suspended Weld Cable Sizes Weld Cable Connection Coaxial Weld Cables Analog Control Cable INSTALLATIONA-7Control Cable Connections Analog Miller Control Cable Adapter K2335-1 Miller Power Source Lincoln Wire FeederPin Function Welding GUN/WIRE Feeder Trigger Connector Wire Drive SystemsRemote Sense Lead Specifications High Frequency Protection Magnum GUN and Cable Assemblies Welding GUNS, Torches and ACCES- Sories Wire Drive Configuration Procedure for Changing Drive and Idle Roll SetsRolls.FIGURE A.4 Gun Receiver For use With Bushing Pressure ARM AdjustmentSet the pressure arm as follows See Figure A.6 Wire Reel Loading Figure A.9 Weld Wire Routing Shielding GAS Connection To install Lincoln conduit See Figure A.10b Installing ElectrodeConduit Kits For Codes 11209, 11210, 11211 and above Figure A.12b Aluminum Wire Preparations Base Model Bench Model Standard Duty Bench Model Heavy Duty INSTALLATIONA-18 Cable Typical System Configurations LF-72/74 Section B-1 Operation Section GAS Input Work Connection Operation Product Description Common Welding AbbreviationsRecommended Processes Figure B.1 Case Front Controls Description Front Panel Controls and Connections Cold FEED/GAS Purge Switch Burnback and Postflow Timer KITStep Trigger Interlock Switch Remote Voltage Control KIT Trigger Connector 5-PIN Amphenol Wire Feed Speed KnobGUN Receiver Bushing K1500-2 Trigger Interlock Section C-1 Accessories Section Optional Kits Accessories LF-72s Accessories Key LF-72/74 Section D-1 Maintenance Section Maintenance MaintenanceCalibration Specification Routine Maintenance Figure D.1 Figure D.3 Major Component Location Section AA Section AA-1 AA-2 WFS Range Wire SizesModel Figure AA.1 AA-3 AA-4 AA-5 Coaxial Weld Cable AA-6 AA-7 INSTALLATIONAA-7K1797-xx AA-8 AA-9 Drive Roll Kits Steel or Cored Wires Figure AA.3 AA-10 Changing the Gun Receiver Bushing AA-11Lation or changing drive rolls and/or Guides AA-12 Assembly of Drive Rolls and Wire Guides Set the pressure arm as follows See Figure AA.8 AA-13 AA-14 Loading 16 to 44 lb .3 20kg Spools See figure AA.8 AA-15 Figure AA.11 AA-16 Figure AA.12a AA-17 Figure AA.12b AA-18 AA-19 Common Equipment SET-UPS AA-20INSTALLATIONAA-20 AA-21 Figure AA.15 High Volume Production AA-22 Figure AA.16 Portable Welding Section BB Section BB-1 Fcaw Innershield or Outershield BB-2 BB-3 Required Equipment Figure BB.1 Case Front Controls Description BB-4 K2426-1 and K2426-2 models BB-5K2426-3 model BB-6 Switch Section CC-1 CC-2 CC-3 CC-4 CC-5 CC-6 Section DD Section DD-1 Nal wiring To verify the wire feed speedWhen inching with gun trigger, electrode WFS knob setting Could remain energized Several seconds DD-3 MAINTENANCEDD-3 DD-4 Figure DD.3 Major Component Location Section E-1 Theory of Operation Section Return to Section Theory of Operation Control Board LF-72/74 Section F-1 Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & Repair PC Board Troubleshooting Procedures Function Problems Function Problems Troubleshooting & Repair Test Description Drive Motor and Tach Feedback Test Test Procedure GAS Solenoid Test Troubleshooting and Repair Figure F.3 Leads 552, 552B Test Procedure Diode Bridge Test 552B + 552A Wire Speed Potentiometer Test 14F-14 Wire Speed Potentiometer Test PC Board Removal and Replacement Removal Procedure Replacement Procedure Control PC Board Removal and Replacement Procedure Troubleshooting and Repair Procedure Wire Drive Motor and Gear BOX Removal and Replacement Procedure Replacement Procedures Operation Verification SET UP LF-72/74 Section G-1 Electrical Diagrams Section LF-72/74 Electrical Diagrams Timer KIT Board Normal Speed Micro Internal panel Motor Connecter Summary High Torque Setting engages Schematic Common Analog Control PC Board G4559 Sheet Electrical Diagrams Electrical Diagrams PC Board Assembly Common Analog Control G4560-2E0