Lincoln Electric SVM 113-A service manual Rheostat Removal and Replacement

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F-39

F-39

TROUBLESHOOTING & REPAIR

RHEOSTAT REMOVAL AND REPLACEMENT (continued)

FIGURE F.15 - RHEOSTAT REMOVAL

See Figure F.15 for steps 3 - 9.

PROCEDURE

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1.Remove the spark plug wire.

2.With the 5/16” nut driver, remove the 8 sheet metal screws that hold the top cover to the control box. Remove the top cover.

3.With the 5/16” nut driver and the 5/16” wrench, remove the 6 screws that hold the control panel in place. Move the panel aside as far as the leads will allow.

4.With the small slot head screw driver, loosen the screw that holds the knob to the rheostat shaft. The shaft has a flat for locating the knob at reassembly.

5.With a 9/16” open or box end wrench, remove the nut that holds the rheostat to the control panel. Support the rheostat with your hand as you turn the nut. There is a shake-proof washer under the nut.

6.Pull the rheostat back out of the control panel and lay it out on its wires to loosen the nuts that hold them.

7.With the 5/16” open or box end wrench, remove the brass nuts from the wire termi- nals. Support the terminals as you turn the wrench to avoid ripping the terminals from their foundations. Note the wire locations for reassembly.

Note: The brass screws are double-nutted with a shake-proof star washer under the screw head.

8.To reinstall the rheostat, replace each of the brass screws. Place a shake-proof star washer under the head, insert the screw into the rheostat and tighten down one nut. Replace the appropriate wires and tighten down the second nut. Again, support the terminals as you turn the wrench to avoid ripping the terminals from their foundations.

9.Reassemble the rheostat to the front of the control panel. Line up the locating tab on the rheostat with the slot on the con- trol panel hole.

10.Reassemble the shake-proof star washer and nut and tighten securely with the 9/16” wrench.

11.Locate the flat spot on the shaft, line up the knob locking screw, push the knob onto the shaft and tighten the screw with the small slot head screw driver.

12.Check the rheostat knob for proper rota- tion, minimum to maximum.

13.Replace the control panel and tighten the 6 sheet metal screws with the 5/16” nut driver and 5/16” wrench.

14.Replace the top cover of the control box and tighten the 8 sheet metal screws with the 5/16” nut driver.

WELDANPOWER 125

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Contents Weldanpowertm California Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Master Table of Contents for ALL Sections Table of Contents Installation Section Technical Specifications Weldanpower InstallationStoring Safety PrecautionsLocation and Ventilation PRE-OPERATION Engine Service Welding Cable Connections Electrical Output ConnectionsPlugs and HAND-HELD Equipment Auxiliary Power ReceptaclesMachine Grounding Circuit Breakers Premises WiringThese Devices Without Table of Contents Operation Section Operation Safety InstructionsOperating Instructions General DescriptionDesign Features Advantages Operational Features and ControlsRecommended Applications Welding CapabilityWELDER/GENERATOR Controls Controls and SettingsFigure B.2 Gasoline Engine Controls Gasoline Engine ControlsStarting the Engine Engine OperationBefore Starting the Engine For Best Engine Starting Stopping the EngineBREAK-IN Period Welding OperationGeneral Information LOW OIL SensingTIG Welding To USE the Weldanpower 125 for WELD- INGTable B.2 Electrode Selection Guide To USE the Weldanpower 125 AS AN Auxiliary Power Supply Auxiliary PowerTable B.3 Generator Power Applications Table of Contents Accessories Briggs and Stratton Accessories OPTIONS/ACCESSORIESLincoln Electric Accessories Table of Contents Maintenance Engine Maintenance Routine and Periodic MaintenanceMaintanence Figure D.3 Clean Finger GuardFigure D.5 SET Spark Plug GAP Table D.2 Engine Maintenance Parts WELDER/GENERATOR MaintenanceFigure D.6 Major Component Locations Table of Contents Theory of Operation Section Idler Board ENGINE, EXCITATION, Rotor and StatorAuxiliary Power Overcurrent Protection Rotor Field Feedback Auxiliary Power Engine Idle ControlFigure E.4 Weld WINDING, Output Rectifier and Choke Weld WINDING, Output Rectifier and ChokeTable of Contents Trouble Shooting & Repair Section HOW to USE Troubleshooting Guide Troubleshooting & RepairElectric Shock can kill PC Board Troubleshooting ProceduresOutput Problems Troubleshooting GuideOutput Rectifier Troubleshooting & Repair Perform the Engine Throttle Engine Problems Main Stator Winding Test Engine Throttle Adjustment Troubleshooting & Repair Weldanpower Materials Needed Rotor Voltage TestTest Description Rotor Voltage Test Test ProcedureRotor Resistance Test Rotor Resistance Test Figure F.3 Brushes Retained with Cable TIE Output Rectifier Bridge Test Output Rectifier Bridge Test Main Stator Test Main Stator Test Figure F.6 Main Stator Molex Plug Test Points Rotor Flashing Circuit Test Rotor Flashing Circuit Test WP125 Idler Engine Throttle Adjustment Test Test Procedure Figure F.12 Idle Speed Adjustment Screw Locations Figure F.13 LOW Idle Adjustment NUT on Idler Solenoid TOC High Idle no Load Output Control AT Maximum Scope SettingsNormal Open Circuit Weld Voltage Waveform Normal Open Circuit Voltage Waveform 115 VAC Supply Machine Loaded to 125 Amps AT 25 VAC Typical Weld Output WaveformMachine Loaded Abnormal Open Circuit Weld Voltage Waveform Description Brush Removal and ReplacementFigure F.14 Brushes Retained with Cable TIE ProcedureProcedure Rheostat Removal and Replacement Rheostat Removal and Replacement Field Capacitor Removal and Replacement Field Capacitor Removal and Replacement Field Diode Bridge Removal and Replacement Field Diode Bridge Removal and Replacement Figure F.18 Field Diode Bridge Location Idler Printed Circuit Board Removal Replacement Carefully remove the board Output Rectifier Bridge Removal Replacement Output Rectifier Bridge Removal and Replacement Troubleshooting & Repair Output Choke Removal and Replacement Output Choke Removal and Replacement Section TOC Instructions STATOR/ROTOR Removal and ReplacementStator Removal Procedure Troubleshooting & Repair Reassembly Procedure Rotor Removal ProcedureFigure F.24 Checking ROTOR-STATOR AIR GAP Feeler Gauge Troubleshooting & Repair Retest After Repair Auxiliary Power Receptacle OUTPUT1Engine Output WELDER/GENERATOR OUTPUT1Weldanpower Table of Contents Diagrams Section Wiring Diagram Code 10158 Idler PC Board M17578 DiagramsSchematic Dimension Print Weldanpower Weldanpower M17578-1 M17578 Idler PC BoardDescription M17578 Idler PC Board Bill of MaterialsWeldanpower
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