Hobart Welding Products OM-925, 217 694E manual Replacing Switch And/Or Head Tube

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.A complete Parts List is available at www.HobartWelders.com

7-7. Replacing Switch And/Or Head Tube

! Turn Off welding power source /wire feeder and disconnect gun.

1 Remove handle locking nut.

3	Slide handle.
2 Remove switch	housing. Install new switch and

connect leads (polarity is not important). Reassemble in reverse order. If replacing head tube, continue to end of figure.

4 Secure head tube in vice.

5Loosen jam nut. Remove from vice and turn head tube out by hand.

6 Hand-tighten head tube into cable connector.

7 Place head tube in vice and tighten until nuts are tight.

8Remove from vice. Reposition handle and install switch housing. Secure with handle locking nut.

Tools Needed:

19 mm

Ref. 800 795-C

OM-925 Page 29

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Contents Processes Arc Welding Power Source Wire FeederDescription OM-925217 694E 2008−10Protect Your Investment From Hobart to YouTable of Contents − ACCESSORIES/CONSUMABLES Arc Welding Hazards Symbol UsageElectric Shock can kill HOT Parts can cause severe burnsARC Rays can burn eyes and skin Fumes and Gases can be hazardousWelding can cause fire or explosion Flying Metal or Dirt can injure eyesFire or Explosion hazard Welding Wire can cause injuryFalling Unit can cause injury Moving Parts can cause injuryCalifornia Proposition 65 Warnings Principal Safety StandardsEMF Information About Implanted Medical DevicesSymboles utilisés UNE Décharge Électrique peut entraîner la mortIndique des instructions spécifiques DES Pièces Chaudes peuvent provoquer des brûlures graves LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un in cendie ou une explosion LES Bouteilles peuvent exploser si elles sont endommagées LE Bruit peut endommager l’ouïeRisque D’INCENDIE OU D’EXPLO- Sion LA Chute DE L’APPAREIL peut blesserProposition californienne 65 Avertissements LES Fils DE Soudage peuvent provoquer des blessuresLE Soudage À L’ARC risque de provoquer des interférences Principales normes de sécurité Information EMFEn ce qui concerne les implants médicaux OM-925 Symbols And Definitions − SpecificationsSpecifications − DefinitionsDuty Cycle And Overheating WarrantyOutput Duty Cycle % Can damage unit or gun and voidVoltage Volt-Ampere Curves15.0 10.0 100 110 120 130 140 150 160Installing Welding Gun − InstallationInstalling Work Clamp Be sure that gun end is tight against drive assemblyChanging Polarity Process/Polarity TableFeedhead Pressure Assembly Open Installing Gas SupplyFeedhead Pressure Assembly Closed Do not use Argon/Mixed gas regulator/flowmeterDo not move or operate unit Where it could tip Selecting a Location And Connecting Input PowerInstalling Wire Spool And Adjusting Hub Tension Align locking hole in spool with locking pin on spool hubRetaining ring used with 8 in 203 mm spool only Installing Contact Tip And Nozzle Turn off welding power sourceUse with solid or flux cored wire Threading Welding Wire Hold wire tightly to keep it from unravelingLay gun cable out straight Pressure Indicator Scale With a setting of 2 or 3 on the scaleTighten Desired drive roll pressure. StartSource or -2. Do not switch under load − OperationControls Material Thickness Reference Chart Weld Parameter Chart 217 618-A Routine Maintenance − Maintenance & TroubleshootingOverload Protection Drive Motor ProtectionTurn Off power before replacing contact tip Changing Drive Roll Or Wire Inlet GuideReplacing Gun Contact Tip Stamped Stamped .030/.035Cleaning Or Replacing Gun Liner Disconnect gun from unitTo Reassemble Gun Replacing Switch And/Or Head Tube Trouble Remedy Troubleshooting TableCircuit Diagram − Electrical Diagram− MIG Welding Gmaw Guidelines Wire Feeder Power Source Shielding GasTypical MIG Process Connections Regulator FlowmeterWire Size Amperage Range Typical MIG Process Control Settings001 in = 1 ampere 125 in = 125 aGroove Welds Holding And Positioning Welding GunPush Perpendicular Drag Conditions That Affect Weld Bead ShapeShort Normal Long Slow Normal FastPoor Weld Bead Characteristics Good Weld Bead CharacteristicsGun Movement During Welding Troubleshooting − Porosity Troubleshooting − Excessive SpatterTroubleshooting − Excessive Penetration Possible Causes Corrective ActionsTroubleshooting − Lack Of Penetration Troubleshooting − Incomplete FusionTroubleshooting − Burn-Through Troubleshooting − Distortion Troubleshooting − Waviness Of BeadBase metal to move DirectionTroubleshooting Guide For Semiautomatic Welding Equipment Common MIG Shielding GasesApplication Readjust welding parameters Welding arc not stable Wire slipping in drive rollsWelding power source Drive rolls if necessaryAccessories − ACCESSORIES/CONSUMABLESReplacement Drive Rolls ConsumablesService SupportAssistance Hobart Welding Products Contact your Distributor for