Replacing Switch And/Or Head Tube | Miller Electric 140 Auto-Set

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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

OM-225 311 Page 39

Image 43

Miller Electric 140 Auto-Set, M-10 Gun, 180 manual Replacing Switch And/Or Head Tube

Contents

File MIG Gmaw OM-225 311CProcesses Description From Miller to You Table of Contents − Parts List − Maintenance &TROUBLESHOOTING Electric Shock can kill Symbol UsageMarks a special safety message Arc Welding Hazards Buildup of GAS can injure or kill ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal can injure eyes California Proposition 65 Warnings EMF Information Principal Safety StandardsAbout Pacemakers LES Fumées ET LES GAZ peuvent être dangereux UNE Décharge Électrique peut entraîner la mortIndique un message de sécurité particulier LE Bruit peut endommager l’ouïe LE Soudage peut provoquer un incendie ou une explosionDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures graves DES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peut SUR En ce qui concerne les stimulateurs cardiaques Principales normes de sécurité VAC Model w/Auto−SetE − SpecificationsSpecifications VAC Model Overheating Duty Cycle And Overheating115 VAC Model 230 VAC Model Amperage Volt-Ampere Curves Installing Welding Gun − InstallationIncorrect Process/Polarity Table Work Cable Routing Inside UnitChanging Polarity Installing Gas Supply See NEC Article 511 or CEC Special installation may beRequired where gasoline or Volatile liquids are present − Do not move or operate unit where it could tip Installing Wire Spool And Adjusting Hub Tension Electrical Service Guide For 230 VAC ModelInput Voltage 230 Input Amperes At Rated Output Remove gun nozzle and contact tip Threading Welding Wire Cut Off End Of Wire Open Pressure Assembly Knob Removing MIG Gun From Welding Power SourceEnd Of Wire To Spool Operation Installing Optional Spool Gun Switch In Welding Power Source Connecting Spool Gun To Millermatic 140/180 Controls For 115 VAC Model w/Auto-SetE − Operation 115V Controls For 115 VAC Model 230V Controls For 230 VAC Model OM-225 311 Weld Parameter Chart For 115 VAC Model w/Auto−SetE 10/90 10/65 10/80 10/60 10/50 10/95 10/75 10/100 Aluminum 100% Argon 4043ER 030 0.8 mm 035 0.9 mm 10/32 OM-225 311 10/90 10/45 10/60 10/30 10/32 10/80 035 0.9 mm 030 0.8 mm #220179 #202926 #220179 Dcep Dcen 024 0.6 mm #220179 030 0.8 mm #202926 035 0.9 mm 045 1.2 mm 100 10/60 10/45 10/40 10/20 10/50 Drive Motor Protection − Maintenance &TROUBLESHOOTINGRoutine Maintenance Overload Protection Turn 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 Table OM-225 311 Circuit Diagram − Electrical Diagram 234 419-B Typical MIG Process Connections − MIG Welding Gmaw Guidelines Select Voltage Typical MIG Process Control SettingsWire Recommendation Wire Speed Select Wire Size Holding And Positioning Welding Gun Conditions That Affect Weld Bead Shape Good Weld Bead Characteristics Poor Weld Bead CharacteristicsGun Movement During Welding Troubleshooting − Porosity Troubleshooting − Excessive SpatterPossible Causes Corrective Actions Troubleshooting − Lack Of Penetration Troubleshooting − Excessive PenetrationTroubleshooting − Incomplete Fusion Troubleshooting − Waviness Of Bead Troubleshooting − Burn-ThroughTroubleshooting − Distortion Application Common MIG Shielding GasesFlat & Horizontal1 Fillet Options − Parts ListRecommended Spare Parts Optional Drive RollsPage Support Service Miller Electric Mfg. Co Owner’s Record