Lincoln Electric LF-72/74 instruction

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RETURN TO MAIN MENU	SVM171-A

	January, 2007

LF-72/74

For use with machines having Code Number : 11075 thru 11293

Safety Depends on You

Lincoln arc welding and cutting equipment is designed and built with safety in mind. However, your overall safety can be increased by proper installation

. . . and thoughtful operation on

your part. DO NOT INSTALL,

OPERATE OR REPAIR THIS EQUIPMENT WITHOUT READ- ING THIS MANUAL AND THE SAFETY PRECAUTIONS CON- TAINED THROUGHOUT. And, most importantly, think before you act and be careful.

SERVICE MANUAL

Copyright © 2007 Lincoln Global Inc.

• World's Leader in Welding and Cutting Products •

• Sales and Service through Subsidiaries and Distributors Worldwide •

Cleveland, Ohio 44117-1199 U.S.A. TEL: 1-888-935-3877 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com

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Lincoln Electric LF-72/74 service manual

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