Hobart Welding Products OM-227 978B guide

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

Image 29

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

Contents

Processes OM-227 978BDescription 2007−04 From 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 kill Welding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or kill California 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’ouïe LA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessures En ce qui concerne les stimulateurs cardiaques Boulevard, Rexdale, Ontario, Canada M9W 1R3 téléphone Symbols And Definitions − SpecificationsSpecifications − Definitions Volt-Ampere Curves Duty Cycle And OverheatingAmperes Output Installing Work Clamp − InstallationInstalling Welding Gun Changing Polarity Process/Polarity Table Installing 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 Gun Threading Welding Wire Controls − Operation Weld Parameter Chart For 230 VAC Model 227 949-B Routine Maintenance − Maintenance &TROUBLESHOOTINGOverload Protection Drive Motor Protection Months Turn 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/.035 To Reassemble Gun Cleaning Or Replacing Gun LinerDisconnect gun from unit Replacing Switch And/Or Head Tube Trouble Remedy Troubleshooting Table OM-227 978 Circuit Diagram − Electrical Diagram 227 951-B Typical MIG Process Connections − MIG Welding Gmaw Guidelines Wire Size Amperage Range Typical MIG Process Control SettingsThickness to Amperage a Amperage Holding And Positioning Welding Gun Push Conditions That Affect Weld Bead ShapePerpendicular Drag Short Normal Long Gun Movement During Welding Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Troubleshooting − Porosity Troubleshooting − Excessive SpatterTroubleshooting − Excessive Penetration Possible Causes Corrective Actions Troubleshooting − Burn-Through Troubleshooting − Lack Of PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Distortion Troubleshooting − Waviness Of BeadCommon MIG Shielding Gases Weld bead Troubleshooting Guide For Semiautomatic Welding Equipment OM-227 978 Main Assembly − Parts List Dia Part Dia Part Mkgs Description Quantity 231 H-14 Gun Consumables Optional Drive RollsOptions Page Work like a Pro Assistance ServiceSupport Hobart Welding Products Contact your Distributor for