Hobart Welding Products OM-227 978B manual Replacing Switch And/Or Head Tube

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7-7. Replacing Switch And/Or Head Tube

Y 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.

4Secure 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.

7Place 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. ST-800 795-C

OM-227 978 Page 25

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Contents Processes OM-227 978BDescription 2007−04From Hobart to You Table of Contents Typical MIG Process Connections − Parts List− MIG Welding Gmaw Guidelines Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings About Pacemakers Principal Safety StandardsEMF Information Indique un message de sécurité particulier UNE Décharge Électrique peut entraîner la mortLES Fumées ET LES GAZ peuvent être dangereux DES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer un incendie ou une explosionDES Pièces Chaudes peuvent provoquer des brûlures graves LE Bruit peut endommager l’ouïeLA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessuresEn ce qui concerne les stimulateurs cardiaques Boulevard, Rexdale, Ontario, Canada M9W 1R3 téléphoneSymbols And Definitions − SpecificationsSpecifications − DefinitionsVolt-Ampere Curves Duty Cycle And OverheatingAmperes OutputInstalling Work Clamp − InstallationInstalling Welding Gun Changing Polarity Process/Polarity TableInstalling Gas Supply Selecting a Location And Connecting Input Power Tools Needed Electrical Service GuideInstalling Wire Spool And Adjusting Hub Tension Installing Contact Tip And Nozzle Appropriate setting Connecting Optional Spool GunThreading Welding Wire Controls − OperationWeld Parameter Chart For 230 VAC Model 227 949-B Routine Maintenance − Maintenance &TROUBLESHOOTINGOverload Protection Drive Motor Protection MonthsTurn Off power before replacing contact tip Changing Drive Roll Or Wire Inlet GuideReplacing Gun Contact Tip 030/.035 Groove Stamped 023/.025 Groove Stamped .030/.035To Reassemble Gun Cleaning Or Replacing Gun LinerDisconnect gun from unit Replacing Switch And/Or Head Tube Trouble Remedy Troubleshooting TableOM-227 978 Circuit Diagram − Electrical Diagram227 951-B Typical MIG Process Connections − MIG Welding Gmaw GuidelinesWire Size Amperage Range Typical MIG Process Control SettingsThickness to Amperage a AmperageHolding And Positioning Welding Gun Push Conditions That Affect Weld Bead ShapePerpendicular Drag Short Normal LongGun Movement During Welding Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Troubleshooting − Porosity Troubleshooting − Excessive SpatterTroubleshooting − Excessive Penetration Possible Causes Corrective ActionsTroubleshooting − Burn-Through Troubleshooting − Lack Of PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Distortion Troubleshooting − Waviness Of BeadCommon MIG Shielding Gases Weld beadTroubleshooting Guide For Semiautomatic Welding Equipment OM-227 978 Main Assembly − Parts ListDia Part Dia Part Mkgs Description Quantity 231 H-14 GunConsumables Optional Drive RollsOptions Page Work like a Pro Assistance ServiceSupport Hobart Welding Products Contact your Distributor for