Lincoln Electric SVM128-A service manual Figure D.6 Tightening the FAN Belt

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D-8

D-8

MAINTENANCE

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TIGHTENING THE FAN BELT: Fan belts tend to loosen after the first 50 hours of operation. If the fan belts are loose, the engine can overheat and the bat- tery can lose its charge. Check belt tightness by press- ing on the belt midway between the pulleys. The belt should deflect no more than 10 mm (0.375 in.). See Figure D.6.

To adjust the fan belt, do the following:

1.See Figure D.6. Loosen the pivot fasteners of the alternator (1) and the adjustment link fasteners (2).

2.Change the position of the alternator to give the cor- rect tension. Tighten the pivot fasteners of the alter- nator and the adjustment link fasteners.

3.Check the belt tension again to ensure that it is still correct.

If a new belt is fitted, the belt tension must be checked again after the first 25 hours of operation.

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FIGURE D.6 – TIGHTENING THE FAN BELT

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SA-250

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Contents SHIELD-ARCTMSA-250 Safety SA-250Electric Shock can kill Welding Sparks can cause fire or explosion IiiPrécautions DE Sûreté Sûreté Pour Soudage a L’ArcMaster Table of Contents for ALL Sections Table of Contents Installation Section Installation Technical Specifications SA-250Safety Precautions Location and VentilationStoring PRE-OPERATION Engine Service Exhaust Spark Arrester Cooling SystemMuffler TrailerElectrical Output Connections Welding Cable ConnectionsAuxiliary Power RECEPTACLES, PLUGS, and HAND-HELD Equipment Machine GroundingCircuit Breakers SA-250 Table of Contents Operation Section Operating Instructions Safety InstructionsOperation General DescriptionRecommended Applications Operational Features and ControlsDesign Features WelderWelding Capability LimitationsControls and Settings WELDER/GENERATOR ControlsControl of Welding Current Current Range SelectorDiesel Engine Controls Figure B.3 Diesel Engine ControlsStarting the Engine Engine OperationBefore Starting the Engine Check and fill the engine fuel tankStopping the Engine Cold Weather StartingBREAK-IN Period Welding Operation After you finish weldingTable B.1 Range Settings for Wire SIZE/SPEED Auxiliary Power 12B-12Table of Contents Accessories OPTIONS/ACCESSORIES TIG Welding Accessories Semiautomatic Welding AccessoriesConnection of Lincoln Electric Wire Feeders Connection of the LN-7 toPIN Amphenol Connection of the LN-25 to Unused Lead IndividuallyFigure C.4 SA-250/LN-25 Across the ARC Connection Diagram Control K487-25 Table of Contents Maintenance Routine and Periodic Maintenance Engine MaintenanceFigure D.1 OIL Drain and Refill Eliminate Air from the Fuel System HOW to Eliminate AIR from the Fuel System Self-vent method Figure D.4 Eliminating AIR from the Fuel SystemFigure D.5 Engine Coolant Drain Plug Figure D.6 Tightening the FAN Belt First 25-50 Hours Daily or BeforeStarting Engine EveryBattery Maintenance Cleaning the BatteryWELDER/GENERATOR Maintenance Idler Maintenance Figure D.5 Major Component Locations SA-250 Table of Contents Theory of Operation Section Theory of Operation ALTERNATOR, and ProtectionCircuits Excitation Flashing Auxiliary and Field Feedback CoilsInterpole and Series Coils Fine Current Adjustment Current Range SelectorEngine Idler Circuit DC Generator Machines Mechanical CouplingSA-250 Table of Contents Troubleshooting & Repair Section Troubleshooting & Repair HOW to USE Troubleshooting GuidePC Board Troubleshooting Procedures PC Board can be damaged by static electricityTroubleshooting Guide Observe Safety GuidelinesDetailed in the beginning of this manual Shunt Field Winding Test Field Shunt Winding Test Output Problems Function Problems Function Problems Troubleshooting & Repair Problems Possible Areas Symptoms Misadjustments Course of ActionWelding Problems Alternator Rotor Test Test DescriptionMaterials Needed Test Procedure Slip Rings BrushesFigure F.2 Measuring Rotor Resistance Figure F.3 Measuring Rotor Resistance to Ground Field Shunt Winding Test Field Shunt Winding Test PIN TAB Idler Solenoid Test Idler Solenoid Test Engine Throttle Adjustment Test Engine Throttle Adjustment Test Strobe Tach MethodFrequency Counter Method Oscilloscope MethodAdjusting Screw Locking NUT Flashing the Fields DescriptionProcedure Do not remove brush holderScope Settings Normal Open Circuit Voltage Waveform 115VAC SupplyHigh Idle no Load Fine Current Control Rheostat AT Maximum Normal Open Circuit DC Weld Voltage Waveform Machine Loaded Selector Switch AT Maximum Position Typical DC Weld Output Voltage WaveformAlternator Rotor Removal Replacement Replacement Alternator Rotor RemovalLoosen Screws Alternator Cover Slip Rings Brushes Figure F.13 Rotor Removal Replacement Alternator Stator Removal and Replacement Procedure Alternator Stator RemovalField Bridge Rectifier VAC Receptacle Circuit Breaker Genernator Brush HOLDER/COIL Cables Figure F.18 Drill Spot Locations Generator Frame Removal and Replacement Generator Frame Removal See Figure F.19 for steps 4Figure F.20 Wire and Selector Switch Connections Figure F.21 Case Front Removal Rope Sling ENGINE/GENERATOR Mounting Holes Troubleshooting & Repair Generator Armature Removal and Replacement Generator Armature Removal Figure F.23 Blower Paddle RemovalEngine Output AC Auxiliary Power Receptacle OutputRetest After Repair Welder DC OutputSA-250 Electrical Diagrams Section Section G SA-250 Electrical Diagrams Wiring DiagramWire Feed Module Wiring Diagram Idler PC Board M13708 Schematic Idler PC Board M13708 Components SVM Error Reporting Form