Hobart Welding Products OM-944 196 639G, 175 manual Replacing Switch And/Or Head Tube

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6-7. 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). Reas- semble 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

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OM-944 Page 27

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Contents Processes OM-944Description From Hobart to You Table of Contents Options and Accessories Warranty Electric Shock can kill Symbol UsageMarks a special safety message Arc Welding HazardsBuildup of GAS can injure or kill ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal can injure eyesCalifornia Proposition 65 Warnings EMF Information Principal Safety StandardsAbout Pacemakers − Consignes DE Sécurité − À Lire Avant Utilisation Identifie un message de sécurité particulierLE Bruit peut affecter l’ouïe LE Soudage peut causer un incen- die ou une explosionLES Particules Projetées peu- vent blesser les yeux LES Pièces Chaudes peuvent cau- ser des brûlures gravesLES Pièces Mobiles peuvent cau- ser des blessures Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peut FaireInformation sur les champs électromagnétiques Principales normes de sécuritéConsignes relatives aux stimulateurs cardiaques Specifications − SpecificationsVAC Model Output Amperes Duty Cycle And OverheatingOutput Duty Cycle %Load Amps Volt-Ampere CurvesInstalling Welding Gun Installing Work Clamp − InstallationChanging Polarity Process/Polarity TableInstalling Gas Supply Rating Label = GND/PE Do not move or operate unit where it could tipInstalling Wire Spool And Adjusting Hub Tension Electrical Service Guide For 230 VAC ModelHold wire tightly to keep it from unraveling Threading Welding WireControls − OperationWelding Guide Weld Parameter Chart For 115 VAC ModelFor 115 Volt Wire Welding Package Weld Parameter Chart For 230 VAC Model For 230 Volt Wire Welding Package Overload Protection Drive Motor Protection − Maintenance &TROUBLESHOOTINGRoutine Maintenance Disconnect power before maintainingTurn Off power before replacing contact tip Changing Drive Roll Or Wire Inlet GuideReplacing Gun Contact Tip Disconnect gun from unit Cleaning Or Replacing Gun LinerTo Reassemble Gun Replacing Switch And/Or Head Tube Trouble Remedy Troubleshooting TableCircuit Diagram For 115 VAC Model − Electrical DiagramCircuit Diagram For 230 VAC Model Typical MIG Process Connections − MIG Welding Gmaw GuidelinesSelect Voltage Typical MIG Process Control SettingsWire Size Amperage Range Thickness to Amperage aHolding And Positioning Welding Gun Conditions That Affect Weld Bead Shape Good Weld Bead Characteristics Poor Weld Bead CharacteristicsGun Movement During Welding Possible Causes Corrective Actions Troubleshooting − Excessive SpatterTroubleshooting − Porosity Troubleshooting − Excessive PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Lack Of PenetrationTroubleshooting − Burn-Through Troubleshooting − Distortion Troubleshooting − Waviness Of BeadCommon MIG Shielding Gases Troubleshooting Guide For Semiautomatic Welding EquipmentApplication Welding arc not stable Wire slipping in drive rolls Return To Table Of Contents Main Assembly − Parts ListDia Part H-10 Gun Options Optional Drive Rolls195 Page Support ServiceHobart Welding Products Contact your Distributor for