Lincoln Electric LF-72/74 service manual AA-17, Figure AA.12a

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AA-17	INSTALLATION	AA-17
INSTALLING ELECTRODE	4. Loosen the set screw on the feed plate and remove
CONDUIT KITS	the incoming bushing.
CONDUIT KITS	FIGURE AA.12a
	FIGURE AA.12a
WARNING	SET
WARNING	SCREW
	CONDUIT
	CONNECTOR

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ELECTRIC SHOCK can kill.

•Turn the input power OFF at the dis- connect switch before working on this equipment.

•Do not touch electrically hot parts.

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Electrode conduit is used when feeding from wire drums, boxes or large reels. For best feeding results, use the shortest conduit length possible and avoid sharp bends.

Tools required:

•1/8" Hex key wrench

•5/16" Nut Driver

To install Lincoln conduit:

1.Turn off power at the welding power source.

FIGURE AA.12

MOUNTING SCREWS *

SECURING WIRE DRIVE PANEL

INCOMING

BUSHING

BALL

BUSHING

ASSEMBLY

O-RING

SET SCREW

MOUNTING SCREWS* SECURING WIRE DRIVE PANEL

*REMOVE 6 MOUNTING SCREWS

THUMB

SCREW

5.Insert the conduit connector into the feed plate and secure with the set screw. Rotate the conduit con- nector so the thumb screw does not interfere with the idle arm or door.

6.Mount the wire drive panel to the sheet metal hous- ing with the six screws.

7.Insert conduit through the sheet metal of the LF-74 and into the conduit connector. Secure with the thumb screw.

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2.Remove the o-ring holding the ball bushing assem- bly to the back of the wire feeder. Remove the ball bushing assembly.

3.Remove the six screws securing the wire drive panel to the sheet metal housing.

LF-72/74

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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-13 AA-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