Lincoln Electric SVM144-B service manual 5MAINTENANCED-5, To open up the handle

Page 29

TOC

D-5MAINTENANCED-5

9. Tighten the setscrew on the brass cable GUN HANDLE DISASSEMBLY connector.

Return to Section

Return to Section TOC

Return to Master

Return to Master TOC

NOTE: Do not install the gas diffuser onto the end of the gun tube at this time.

10.Straighten the cable with the gas nozzle and noz- zle insulator removed from the gun tube.

11.Trim the liner to the length shown in Figure D.2.

FIGURE D.2 — LINER MAINTENANCE.

SET

BRASS CABLE

SCREW

CONNECTOR

1-1/4" (1.25)

(31.8MM)

LINER TRIM

LENGTH

The internal parts of the gun handle may be inspected or serviced if necessary.

The gun handle consists of two halves that are held together with a collar on each end.

To open up the handle:

1.Turn the collars approximately 60 degrees coun- terclockwise (the same direction as removing a right hand thread) until the collar reaches a stop.

2.Pull the collar off the gun handle.

NOTE: If the collars are difficult to turn, position the gun handle against a corner, place a screwdriver against the tab on the collar and give the screwdriver a sharp blow to turn the collar past an internal locking rib. See Figure D.3.

FIGURE D.3 — GUN HANDLE DISASSEMBLY.

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

GAS DIFFUSER

NOZZLE INSULATOR

GAS NOZZLE

12.Remove any burrs from the end of the liner.

13.Screw the gas diffuser onto the end of the gun tube and tighten.

NOTE: Be sure the gas diffuser is correct for the liner being used. (See table and diffuser stencil.)

14.Slightly tighten the set screw in the side of the gas diffuser against the cable liner using 5/64 in. (2.0 mm) Allen wrench.

CAUTION

This screw should only be gently tightened. Over tight- ening will split or collapse the liner and cause poor wire feeding.

------------------------------------------------------------------------

POWER MIG 255

Image 29
Contents Power MIG Safety Electric Shock can kill Welding Sparks can cause fire or explosion SafetySûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation Section Table of ContentsTechnical Specifications Power MIG InstallationLocation Safety PrecautionsUncrating the Power MIG Power MIG Figure A.2 Triple Voltage Machine Input Connections Shielding GAS GUN and Cable InstallationSection B Operation SectionFumes and Gases can be dangerous OPERATIONB-2Product Description OperationWelding Capability LimitationsDescription of Controls Wire Reel Loading READI-REELS, SPOOLS, or Coils Procedure for Changing Drive and Idle Roll SetsSetting RUN-IN Speed on STAN- Dard Power MIG Feeder Feeding Wire ElectrodeIdle Roll Pressure Setting To Start the WelderMaking a Weld Avoiding Wire Feeding ProblemsInput Line Voltage Protection FAN ControlSection C Accessories SectionDrive Roll Kits AccessoriesK363P READI-REEL Adapter Dual Cylinder Mounting KIT K1702-1Operating Instructions For Timer KIT Spool GUN Adapter KIT Making a Weld with the Spool GUN, Spool GUN InstalledSection D Maintenance SectionGUN Tubes and Nozzles MaintenanceRoutine and Periodic Maintenance Figure D.1 Component Locations Liner Removal Replacement Contact TIP and GAS Nozzle InstallationTo open up the handle 5MAINTENANCED-5Description English Size Metric Size Table D.2Section E Theory of Operation SectionMain Transformer Theory of OperationInput Line Voltage Feedback Control Output RectificationFigure E.4 Constant Voltage Output Constant Voltage OutputFeedback Wire Drive MotorOvercurrent Protection Wire Feed Overload ProtectionThermal and Overload Protection Figure E.6 SCR Operation SCR OperationPower MIG Section F Troubleshooting & Repair SectionHOW to USE Troubleshooting Guide Troubleshooting & RepairWorkstations PC Board Troubleshooting ProceduresOutput Problems SCR Rectifier Rectifier Function Problems Wire Feeding Problems Welding Problems Welding Problems Test Description Main Transformer TestMain Transformer Test Test ProcedureFigure F.1 Troubleshooting and Repair Materials Needed Rectifier Diode Bridge TestTest Description Rectifier Diode Bridge Testing 208R 206 28 VAC 209R Power MIG Static SCR Rectifier Assembly Test Static SCR Rectifier Assembly Test Active SCR Rectifier Assembly Test Power MIG Active SCR Rectifier Assembly Test Active SCR Rectifier Assembly Test Figure F.7 Location Leads X2 Open switch SW-1 Wire Drive Motor and Tachometer Feedback Test Wire Drive Motor and Tachometer Feedback Test 515B 206B 15 VDC 5J1 1J1 Test for Supply Voltage to Tachometer555 206B To 3.5 VDC 6J1 1J1 Test for Feedback Voltage to Control BoardVolts Normal Open Circuit Voltage WaveformTypical Output Voltage Waveform Machine Loaded Machine Loaded to 250 Amps AT 26 VDC Scope SettingsMachine Loaded to 220 Amps AT 22 VDC Scope Settings Troubleshooting & Repair Typical SCR Gate Voltage Waveform Power MIG Description Control PC Board Removal and Replacement ProcedureControl PC Board Removal and Replacement ProcedureFigure F.11 Control Board Mounting Power MIG Wire Drive Assembly Removal and Replacement Procedure 41TROUBLESHOOTING & REPAIRF-41Procedure Wire Drive Assembly Removal and ReplacementTOC Power MIG SCR Output Rectifier Removal and Replacement Procedure SCR Output Rectifier Removal and Replacement Figure F.15 Right Heat Sink Lead Disconnection Power MIG Capacitor Bank Removal and Replacement Procedure Capacitor Bank Removal and Replacement Troubleshooting & Repair Main Transformer and Output Choke Removal and ReplacementTOC Power MIG FAN Motor Assembly Removal and Replacement Procedure FAN Motor Assembly Removal and Replacement Wire Speed Range Troubleshooting and RepairRetest After Repair Open Circuit VoltagePower MIG Electrical Diagrams Section Wiring Diagram Entire Machine Code 10563 L10979 Power MIG 255 208/230VWiring Diagram Entire Machine Code 10583 L10980 Power MIG 255 230/460/575VWiring Diagram Entire Machine Code 10986 L11980 Power MIG 255 230/460/575Wiring Diagram Entire Machine Code 10990 L11979 Power MIG 255 208/230Control PC Board Schematic G3520-1D1 3521 Control PC Board Assembly G3521-1Powermig Display PC Board Schematic L10951Lincoln Electric CO Display PC Board Assembly L10952-124374 S Snubber PC Board Schematic S2437400 ~.04 Snubber PC Board Assembly M19248-1SVM Error Reporting Form