Manuals / Lincoln Electric / Power Tools / Welder

Lincoln Electric LF-72/74 service manual LF-72s

Models: LF-72/74

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C-3

ACCESSORIES

C-3

OPTIONAL KITS:

Includes: 14 pin to 14 pin wire

K1797-xx

Control Cable.

feeder to power source control

cable.

Includes: Adapter control

K2335-1

Adapter for Miller Power Sources.

cable for connecting a Lincoln

42 VAC wire feeder to a 24

VAC Miller power source.

Includes: One transformer kit

K1520-1

42 Volt Transformer Kit.

for operating a 42 VAC wire

feeder on a power source

supplying only 115 VAC.

K1798

Adapter Cable for Control Cable to

Includes:

Terminal Strip Power Sources.

K910-1

Ground Clamp.

Includes: One 300 Amp

Ground Clamp.

K910-2

Ground Clamp.

Includes: One 500 Amp

Ground Clamp.

Gun Receiver Bushing (for guns

Includes: Gun receiver bush-

K1500-1

with K466-1 Lincoln gun connec-

ing, set screw and hex key

tors; Innershield and Subarc

wrench.

guns.)

K1500-2

Gun Receiver Bushing (for guns with

Includes: Gun receiver bush-

K466-2, K466-10 Lincoln gun con-

ing with hose nipple, set

(standard on all

screw and hex key wrench.

nectors; Magnum 200/300/400 guns

LF-72's)

and compatible with Tweco® #4.)

Gun Receiver Bushing (for guns

Includes: Gun receiver bush-

K1500-3

with K613-7 Lincoln gun connec-

ing with hose nipple, set

tors; Magnum 550 guns and com-

screw and hex key wrench.

patible with Tweco® #5.)

Gun Receiver Bushing (for gun

Includes: Gun receiver bush-

with K466-3 Lincoln gun connec-

K1500-4

ing with hose nipple, set

tors; compatible with Miller®

screw and hex key wrench.

guns.)

Includes: Gun receiver bush-

K1500-5

Gun Receiver Bushing (compatible

ing with hose nipple, 4 guide

with Oxo® guns.)

tubes, set screw and hex key

wrench.

LF-72/74

Image 35

Lincoln Electric LF-72/74 service manual LF-72s

Contents

LF-72/74 Safety Electric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Section A-1 Table of ContentsInstallation Section Amp Rating Duty Cycle InstallationMounting Safety PrecautionLocation Suspended Bench MountSwivel Mount Boom MountWeld Cable Sizes Weld Cable Connection Coaxial Weld CablesControl Cable Connections INSTALLATIONA-7Analog Control Cable Pin Function Miller Power Source Lincoln Wire FeederAnalog Miller Control Cable Adapter K2335-1 High Frequency Protection Wire Drive SystemsWelding GUN/WIRE Feeder Trigger Connector Remote Sense Lead SpecificationsMagnum GUN and Cable Assemblies Welding GUNS, Torches and ACCES- SoriesRolls.FIGURE A.4 Procedure for Changing Drive and Idle Roll SetsWire Drive Configuration Set the pressure arm as follows See Figure A.6 Pressure ARM AdjustmentGun Receiver For use With Bushing Wire Reel Loading Figure A.9 Weld Wire RoutingShielding GAS Connection For Codes 11209, 11210, 11211 and above Installing ElectrodeTo install Lincoln conduit See Figure A.10b Conduit KitsFigure A.12b Aluminum Wire PreparationsBase Model Bench Model Standard Duty Bench Model Heavy Duty INSTALLATIONA-18Cable Typical System ConfigurationsLF-72/74 Section B-1 Operation SectionGAS Input Work Connection OperationRecommended Processes Common Welding AbbreviationsProduct Description Figure B.1 Case Front Controls Description Front Panel Controls and ConnectionsRemote Voltage Control KIT Burnback and Postflow Timer KITCold FEED/GAS Purge Switch Step Trigger Interlock SwitchTrigger Interlock Wire Feed Speed KnobTrigger Connector 5-PIN Amphenol GUN Receiver Bushing K1500-2Section C-1 Accessories SectionOptional Kits AccessoriesLF-72s Accessories Key LF-72/74 Section D-1 Maintenance SectionRoutine Maintenance MaintenanceMaintenance Calibration SpecificationFigure D.1 Figure D.3 Major Component Location Section AA Section AA-1Model WFS Range Wire SizesAA-2 Figure AA.1 AA-3AA-4 AA-5 Coaxial Weld Cable AA-6K1797-xx INSTALLATIONAA-7AA-7 AA-8 AA-9 Drive Roll Kits Steel or Cored WiresFigure AA.3 AA-10Guides AA-11Changing the Gun Receiver Bushing Lation or changing drive rolls and/orAA-12 Assembly of Drive Rolls and Wire GuidesSet the pressure arm as follows See Figure AA.8 AA-13AA-14 Loading 16 to 44 lb .3 20kg Spools See figure AA.8 AA-15Figure AA.11 AA-16Figure AA.12a AA-17Figure AA.12b AA-18AA-19 Common Equipment SET-UPS AA-20INSTALLATIONAA-20AA-21 Figure AA.15 High Volume ProductionAA-22 Figure AA.16 Portable WeldingSection BB Section BB-1Fcaw Innershield or Outershield BB-2BB-3 Required EquipmentFigure BB.1 Case Front Controls Description BB-4K2426-3 model BB-5K2426-1 and K2426-2 models BB-6 SwitchSection CC-1 CC-2 CC-3 CC-4 CC-5 CC-6 Section DD Section DD-1WFS knob setting Could remain energized Several seconds To verify the wire feed speedNal wiring When inching with gun trigger, electrodeDD-3 MAINTENANCEDD-3DD-4 Figure DD.3 Major Component LocationSection E-1 Theory of Operation SectionReturn to Section Theory of OperationControl Board LF-72/74 Section F-1 Troubleshooting & Repair SectionHOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board Troubleshooting Procedures Function Problems Function Problems Troubleshooting & Repair Test Description Drive Motor and Tach Feedback TestTest Procedure GAS Solenoid Test Troubleshooting and RepairFigure F.3 Leads 552, 552B Test ProcedureDiode Bridge Test 552B + 552A Wire Speed Potentiometer Test 14F-14 Wire Speed Potentiometer TestPC Board Removal and Replacement Removal Procedure Replacement Procedure Control PC Board Removal and Replacement ProcedureTroubleshooting and Repair Procedure Wire Drive Motor and Gear BOX Removal and ReplacementProcedure Replacement Procedures Operation Verification SET UPLF-72/74 Section G-1 Electrical Diagrams SectionLF-72/74 Electrical DiagramsTimer 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