Hobart Welding Products OM-227 978B manual Changing Drive Roll Or Wire Inlet Guide

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7-4. Changing Drive Roll Or Wire Inlet Guide

1

1Inlet Wire Guide Securing Screw

2Inlet Wire Guide

Loosen screw. Slide tip as close to drive rolls as possible without touching. Tighten screw.

3 Retaining Pin

2

Tools Needed:

4

3

To remove drive roll, push drive roll in and rotate it (1/4 turn) to the open slot and slide it out over the retaining pin.

To secure drive roll, locate open slot and push drive roll completely over retaining pin, then rotate drive roll (1/4 turn) to closed slot.

4 Drive Roll

The drive roll consists of two different sized grooves. The stamped markings on the end surface of the drive roll refers to the

.030/.035 Groove

Stamped .024

.023/.025 Groove

Stamped .030/.035

groove on the opposite side of the drive roll. The groove closest to the motor shaft is the proper groove to thread (see Section 5-11).

Ref. 803 714-A

7-5. Replacing Gun Contact Tip

Y Turn Off power before replacing contact tip.

1 Nozzle

2 Contact Tip

Cut off welding wire at contact tip.

Remove nozzle.

Remove contact tip and install new contact tip. Reinstall nozzle.

2

1

Tools Needed:

Ref. 802 399-A

OM-227 978 Page 23

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Contents 2007−04 OM-227 978BProcesses DescriptionFrom Hobart to You Table of Contents − Parts List − MIG Welding Gmaw GuidelinesTypical MIG Process Connections 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 Principal Safety Standards EMF InformationAbout Pacemakers UNE Décharge Électrique peut entraîner la mort LES Fumées ET LES GAZ peuvent être dangereuxIndique 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 gravesDES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peut SUREn ce qui concerne les stimulateurs cardiaques Boulevard, Rexdale, Ontario, Canada M9W 1R3 téléphone− Definitions − SpecificationsSymbols And Definitions SpecificationsOutput Duty Cycle And OverheatingVolt-Ampere Curves Amperes− Installation Installing Welding GunInstalling Work Clamp Changing Polarity Process/Polarity TableInstalling Gas Supply Selecting a Location And Connecting Input Power Electrical Service Guide Installing Wire Spool And Adjusting Hub TensionTools Needed Installing Contact Tip And Nozzle Appropriate setting Connecting Optional Spool GunThreading Welding Wire Controls − OperationWeld Parameter Chart For 230 VAC Model 227 949-B Months − Maintenance &TROUBLESHOOTINGRoutine Maintenance Overload Protection Drive Motor Protection030/.035 Groove Stamped 023/.025 Groove Stamped .030/.035 Changing Drive Roll Or Wire Inlet GuideTurn Off power before replacing contact tip Replacing Gun Contact TipCleaning Or Replacing Gun Liner Disconnect gun from unitTo Reassemble Gun 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 GuidelinesAmperage Typical MIG Process Control SettingsWire Size Amperage Range Thickness to Amperage aHolding And Positioning Welding Gun Short Normal Long Conditions That Affect Weld Bead ShapePush Perpendicular DragPoor Weld Bead Characteristics Good Weld Bead CharacteristicsGun Movement During Welding Possible Causes Corrective Actions Troubleshooting − Excessive SpatterTroubleshooting − Porosity Troubleshooting − Excessive PenetrationTroubleshooting − Lack Of Penetration Troubleshooting − Incomplete FusionTroubleshooting − Burn-Through Weld bead Troubleshooting − Waviness Of BeadTroubleshooting − Distortion Common MIG Shielding GasesTroubleshooting Guide For Semiautomatic Welding Equipment OM-227 978 Main Assembly − Parts ListDia Part Dia Part Mkgs Description Quantity 231 H-14 GunOptional Drive Rolls OptionsConsumables Page Work like a Pro Service SupportAssistance Hobart Welding Products Contact your Distributor for