Lincoln Electric LF-72/74 service manual CC-5

Page 75

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CC-5

ACCESSORIES

CC-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 75

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 Table of Contents Installation SectionSection A-1 Amp Rating Duty Cycle InstallationSafety Precaution LocationMounting Suspended Bench MountSwivel Mount Boom MountWeld Cable Sizes Weld Cable Connection Coaxial Weld CablesINSTALLATIONA-7 Analog Control CableControl Cable Connections Miller Power Source Lincoln Wire Feeder Analog Miller Control Cable Adapter K2335-1Pin Function High Frequency Protection Wire Drive SystemsWelding GUN/WIRE Feeder Trigger Connector Remote Sense Lead SpecificationsMagnum GUN and Cable Assemblies Welding GUNS, Torches and ACCES- SoriesProcedure for Changing Drive and Idle Roll Sets Wire Drive ConfigurationRolls.FIGURE A.4 Pressure ARM Adjustment Gun Receiver For use With BushingSet the pressure arm as follows See Figure A.6 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 OperationCommon Welding Abbreviations Product DescriptionRecommended Processes 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-1WFS Range Wire Sizes AA-2Model Figure AA.1 AA-3AA-4 AA-5 Coaxial Weld Cable AA-6INSTALLATIONAA-7 AA-7K1797-xx 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-4BB-5 K2426-1 and K2426-2 modelsK2426-3 model 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