Lincoln Electric SVM125-A service manual Troubleshooting & Repair

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2. The engine alternator may be faulty, causing the CR1 relay (PC Board on later models) to activate, which signals the engine protection relay to shut off the fuel solenoid.
3. The protection relay may be faulty. Note: On later models the Idler Engine Protection PC board may be faulty.
4. The engine fuel injectors may need service.
CAUTION
If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216- 383-2531 or 1-800-833-9353.
CLASSIC II
1. Check for adequate fuel supply.
2. Check engine oil level.
3. Check engine alternator belt.
The engine starts but shuts down after a short period of time.
4. The engine fuel injectors may need service.
1. The oil pressure or oil tempera- ture sensor may be causing the engine protection relay (PC Board on later models) to shut off the fuel solenoid. Make sure oil pressure and temperature are correct before replacing sensors.
4. On later models check the fuel solenoid circuit breaker located near the welding output termi- nals. Reset if tripped.
3. The engine protection relay may be faulty. Note: On later models the Idler/Engine Protection PC board may be faulty.
3. Check the fuse in the engine protection relay. Note: Not present on later models.
2. Check the fuel solenoid. Make sure it is opening when 12VDC is applied to leads #58(+) to #60(-).
The engine “cranks” but will not 1. Check for adequate fuel supply.
start.
2. Press the engine protection “Reset” button. Note: On later models without a “Reset” but- ton, turn the ignition switch “OFF” and then back “ON.”
1. Check the ignition switch for proper operation. Check the associated leads for loose or faulty connections. See the Wiring Diagram.
POSSIBLE AREAS OF
MISADJUSTMENT(S) ENGINE PROBLEMS
PROBLEMS (SYMPTOMS)
RECOMMENDED COURSE OF ACTION
Observe Safety Guidelines detailed in the beginning of this manual.
TROUBLESHOOTING GUIDE

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TROUBLESHOOTING & REPAIR

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Contents Classic II TM California Proposition 65 Warnings SafetyElectric 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 Section Technical Specifications Classic InstallationLocation and Ventilation Safety PrecautionsStoring PRE-OPERATION Engine Service Spark Arrester Muffler UndercarriagesWelding Cable Connections Electrical Output ConnectionsMachine Grounding Auxiliary Power RECEPTACLES, PLUGS, and HAND-HELD EquipmentCircuit Breakers Classic Table of Contents Operation Section Operation Safety InstructionsOperating Instructions General DescriptionDesign Features Operational Features and ControlsRecommended Applications WelderLimitations Welding CapabilityWELDER/GENERATOR Controls Controls and SettingsFigure B.2 Current Controls Control of Welding CurrentReturn to Diesel Engine ControlsBefore Starting the Engine Engine OperationStarting the Engine Check and fill the engine fuel tankCold Weather Starting Stopping the EngineBREAK-IN Period General Information Welding OperationIdler Operation Figure B.4 Welding Circuit Connections for Stick Welding After you finish weldingTable B.1 Range Settings for Wire SIZE/SPEED 13B-13 Auxiliary PowerSuggested Power Applications Running Watts Start-up Watts Table B.2 Generator Power ApplicationsTable of Contents Accessories Accessory Kit K703 Includes the following OPTIONS/ACCESSORIESSemiautomatic Welding TIG WeldingConnection of the LN-7 to Classic II Using K867 Universal Connection of Lincoln Electric Wire FeedersAdapter see Figure C.1 Adapter Work Electrode Cable To LN-7 Figure C.3 Classic II/LN-25 Connection Diagram With K444-2 Remote Control K487-25 Table of Contents Maintenance Engine Maintenance Routine and Periodic MaintenanceFigure D.1 OIL Drain and Refill Figure D.2 Tightening the Cooling Blower Belt Starting Engine Daily or BeforeFirst 50 Hours Every 50 HoursChecking Specific Gravity Battery MaintenanceIdler Maintenance WELDER/GENERATOR MaintenanceFigure D.3 Major Component Locations Table of Contents Theory of Operation Section ALTERNATOR, and Protection Theory of OperationCircuits Auxiliary and Field Feedback Coils Excitation FlashingInterpole and Series Coils Current Range Selector Fine Current AdjustmentEngine Idler Circuit DC Generator Machines Classic Table of Contents Troubleshooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairPC Board can be damaged by static electricity PC Board Troubleshooting ProceduresObserve Safety Guidelines Troubleshooting GuideDetailed in the beginning of this manual Shunt Field Winding Test Perform the Shunt Field Wind Troubleshooting & Repair Function Problems Troubleshooting & Repair Troubleshooting & Repair Troubleshooting & Repair Welding Problems Test Description Alternator Rotor TestMaterials Needed Alternator Rotor Test Test ProcedureFigure F.2 Measuring Rotor Resistance Classic Figure F.3 Measuring Rotor Resistance to Ground Classic Shunt Field Winding Test Shunt Field Winding Test PIN TAB Idler Solenoid Test Idler Solenoid Test Engine Throttle Adjustment Test Engine Throttle Adjustment Test Oscilloscope Method Frequency Counter MethodAdjusting Screw Locking NUT Description Flashing the FieldsDo not remove brush holder ProcedureNormal Open Circuit Voltage Waveform 115VAC Supply Scope SettingsHigh Idle no Load Fine Current Control Rheostat AT Maximum Normal Open Circuit DC Weld Voltage Waveform Typical DC Weld Output Voltage Waveform Machine Loaded Selector Switch AT Maximum PositionAlternator Rotor Removal Replacement Alternator Rotor Removal ReplacementFuel Tank Return Line Mounting Hardware Cable Retainer Bowl Negative Output Terminal Copper Strap on Rear Side Figure F.14 Alternator Cover Removal Figure F.15 Rotor Removal Replacement Alternator Stator Removal and Replacement Alternator Stator Removal ProcedureVAC Receptacle Circuit Breaker Field Bridge Rectifier Genernator Brush HOLDER/COIL Cables Drill Spot STATOR/ENDBRACKET Mounting Bolt Generator Frame Removal and Replacement Figure F.21 Generator Lead and Cable Connections Generator Frame RemovalRope Sling ENGINE/GENERATOR Mounting Holes Generator Armature Removal and Replacement Blower Paddle PADDLE/ARMATURE Mounting Bolts Generator Armature RemovalRetest After Repair AC Auxiliary Power Receptacle OutputEngine Output Welder DC OutputElectrical Diagrams Section Classic Wiring Diagram Code Electrical DiagramsRemote Control Optional Remote Control Optional Wire Feed Module Optional Wire Feed Thermostat * Machine Must not be Running J3 Sensor Idler PC Board M13708 Schematic Idler PC Board M13708 Components Idler PC Board l9902 Schematic Idler PC Board l9902 Components

SVM125-A specifications

The Lincoln Electric SVM125-A is a versatile and highly efficient welding machine that has gained significant recognition in the welding industry. Designed for both professionals and enthusiasts, this machine combines advanced technology with user-friendly features to deliver outstanding performance in a range of welding applications.

One of the standout features of the SVM125-A is its Inverter Technology. This cutting-edge technology allows for lightweight and compact design, making the machine highly portable. The inverter technology also provides a steady arc, which is crucial for achieving clean, high-quality welds. With a duty cycle of 125 amps at a 60% duty cycle, this welding machine can handle a variety of materials and thicknesses, from thin sheet metal to heavier structural components.

The SVM125-A supports multiple welding processes, including MIG, stick, and TIG welding. This versatility makes it an ideal choice for diverse welding tasks, whether you're working in a fabrication shop, doing repair work, or engaged in hobbyist projects. The machine features easy switch functionality, allowing users to quickly shift between welding processes without complicated setup.

Another notable characteristic is the machine's user-friendly interface. The intuitive control panel includes clear indicators and knobs that allow for easy adjustments of voltage and wire feed speed. This design is especially helpful for novice welders, providing them with the confidence to make adjustments as needed and ensuring optimal weld quality.

Safety is also a priority with the SVM125-A. The machine is equipped with thermal overload protection, which automatically shuts it down in case of overheating, preventing damage to the unit and ensuring operator safety. Additionally, the machine features a robust construction that emphasizes durability, making it suitable for demanding work environments.

Portability is enhanced through its lightweight design, and the built-in carrying handle makes it easy to transport from one job site to another. The SVM125-A is also compatible with a variety of welding accessories, further increasing its adaptability and functionality.

In conclusion, the Lincoln Electric SVM125-A stands out as a well-rounded welding machine that integrates advanced technology with user-friendly features. Its versatility in welding processes, robust design, and emphasis on safety and usability make it a valuable tool for welders at all skill levels. Whether for professional use or personal projects, the SVM125-A is a reliable choice that delivers exceptional performance and quality.
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