Lincoln Electric SVM208-A service manual Brush Removal and Replacement, Cable TIE Brushes

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F-32	TROUBLESHOOTING AND REPAIR	F-32

BRUSH REMOVAL AND REPLACEMENT (continued)

FIGURE F.10 – BRUSHES RETAINED WITH CABLE TIE

CABLE

TIE

BRUSHES

PROCEDURE

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1.Remove the spark plug wire.

2.Open the brush holder assembly cover. Squeeze the 2 tabs and depress the cover at the top with a screw driver or your fingernail. The cover will drop open on its bottom hinge.

3.With the 1/4” nut driver, remove the 2 screws that hold the brush holder assembly in place.

4.With the needlenose pliers, gently remove the black and the red wires.

NOTE: The red wire is inboard. “RED” is marked on the brush holder beside the terminal for the red wire.

5.To change the brushes, use the slot head screw driver to pop off the plastic retainer on the back of the brush holder assembly.

6.Remove the old brush assemblies and insert the new ones. One corner of the terminal clip is beveled so that the brush can go in only one way.

7.Snap the plastic retainer back onto the brush holder. The brushes may need some reposi- tioning; wiggle them slightly to help them seat properly on the slip rings.

BULLDOG® 140

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Contents Bulldog Safety California Proposition 65 WarningsElectric Shock can kill ARC Rays can burn Can be dangerousIii Welding and Cutting Sparks can cause fire or explosionCylinder may explode if damaged Précautions DE Sûreté Sûreté Pour Soudage a L’ArcSafety Methods of Reducing Emissions Mains Supply Master Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications Bulldog 140 K2708-1Safety Precautions Location and VentilationStoring Engine Exhaust can killPRE-OPERATION Engine Service StackingTilting OILTable A.1 Recommended Welding Cable Size and Length Electrical Output CONNEC- TionsWelding Cable Connections Auxiliary Power Receptacles Cable InstallationElectrical Connections Plugs and HAND-HELD EquipmentPremises Wiring Circuit BreakersAtion. do not RUN These BulldogTable of Contents Operation Section Operation Output Panel Controls LimitationsWELDER/GENERATOR Controls Engine Operation Gasoline Engine ControlsBefore Starting the Engine Starting the EngineGenerator Operation Table B.1 Generator Power Applications Welding Operation Control Function / OperationMaterial Thickness Electrode Type Size Setting Welding GuidelinesStick Welding Learning To Stick WeldWhat Happens in the Arc? Correct Welding Position Side viewPractice Use the followingDo the following Butt JointsFillet Joints PenetrationVertical-Up Welding Vertical-Down WeldingHow to Hardface the Sharp Edge Metal to Ground Wear Overhead WeldingWelding Sheet Metal Hardfacing To Reduce WearWelding Cast Iron Cast Iron Plate PreparationOut-of-Position Group AWS E6011 High-Speed Group AWS E6013Low Hydrogen Group AWS E7018 Bulldog Table of Contents Accessories Section Lincoln Electric Accessories AccessoriesOPTIONS/ACCESSORIES Table of Contents Maintenance Section Maintenance Location Routine and Periodic MaintenanceEngine Maintenance Engine Adjustments Return to Section TOC To Section TOCOperational Clearance Table D.1 Engine Maintenance PartsSpark Plug Service GENERATOR/WELDER Maintenance Screws BrushesFigure D.7. Major Component Locations Bulldog 1TABLE of CONTENTS-THEORY of Operation Section E-1 Theory of Operation ENGINE, EXCITATION, Rotor StatorRotor Field Feedback Auxiliary Power Figure E.3 Rotor Field Feedback and Auxiliary PowerAuxiliary Power Overcurrent Protection Weld Winding and Reactor1TABLE of Contents Troubleshooting and Repair F-1 Troubleshooting and Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures Output Problems Electric Authorized Field Ser vice Facility Perform the Rotor Voltage TestProblems Symptoms Troubleshooting and Repair Perform Field Diode Test Engine Problems Troubleshooting and Repair Engine Throttle Adjustment Test Bulldog Materials Needed Rotor Voltage TestTest Description Lead 200A Connection Ground Stud ProcedureRotor Voltage Test Field Diode Bridge Test Field Diode Bridge Test + ~Rotor Flashing Circuit Test Rotor Flashing Circuit Test Figure F.3 Brush Holder Leads 201- and 202B +Moving Parts can injure Bulldog Rotor Resistance Test Rotor Resistance Test Cable TIE Brushes Figure F.6 Brushes Retained with Cable TIEBulldog Engine Throttle Adjustment Test ROBIN/SUBARU Engine Engine Throttle Adjustment Test ROBIN/SUBARU EngineStrobe-tach Method Frequency Counter MethodHigh Speed Stop Screw Scope Settings Normal Open Circuit Voltage Waveform 115VAC Supply High Idle no LoadMachine Loaded to 125 Amps AT 23 VAC Typical Weld Output WaveformMachine Loaded Brush Removal and Replacement Brush Removal and Replacement Cable TIE BrushesReturn to Section Return to Section TOC Bulldog Rheostat Removal and Replacement Rheostat Removal and Replacement Figure F.11 Rheostat RemovalCapacitor AND/OR Diode Bridge Removal and Replacement Capacitor AND/OR Diode Bridge Removal and ReplacementProcedure Capacitor Removal and Replacement Procedure Field Diode Bridge Removal and Replacement Figure F.13 Field Diode Bridge LocationBulldog STATOR/ROTOR Removal and Replacement InstructionsSTATOR/ROTOR Removal and Replacement GeneratorengineFigure F.15 Generator Components Troubleshooting and Repair Stator Removal Procedure Figure F.16 Output Lead Location TIE Wrap TerminalsThru Bolts Support NutsRotor Removal Procedure Reassembly ProcedureFigure F.19 Checking ROTOR-STATOR AIR GAP Auxiliary Power Receptacle OUTPUT1 Retest After RepairEngine Output WELDER/GENERATOR OUTPUT1Bulldog Table of Contents Diagram Section Wiring Diagram Bulldog S28101