Hobart Welding Products 250 Replacing Drive Roll And Wire Inlet Guide, Turn Off power

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5-3. Replacing Drive Roll And Wire Inlet Guide

1Inlet Wire Guide Securing Screw

2Inlet Wire Guide

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

3 Drive Roll

Install correct drive roll for wire size and type.

4 Drive Roll Securing Screw

2

3

4

Secure drive roll with screw as shown.

1

Tools Needed:

Ref. 802 285-C

5-4. Removing Knob From Front Panel

2

1

3

4

Slide

Knob Depress Spring

Clip 5

YTurn Off power.

1 Front Panel

2 Knob

3 Spring Clip

4 Control Shaft

5 Slot

Rotate knob to allow access to slot. Insert Allen wrench (or stiff piece of wire) into slot, and while depressing spring clip, slide knob off control shaft.

To reinstall, push knob fully onto control shaft.

Ref. 803 863-B / 802 280-E

OM-192 440 Page 25

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Contents Processes OM-192 440WDescription File MIG GmawFrom Hobart to You Table of Contents Warranty 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 Incendie ou une explosion LE Soudage peut provoquer unDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures gravesLA 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 Principales normes de sécuritéWelding Power Source Duty Cycle And Overheating SpecificationsExceeding duty cycle can damage unit and void warranty OverheatingDefinition Welding Gun Duty Cycle And OverheatingVolt-Ampere Curves Installing Welding Gun Installing Work Clamp Connecting To Weld Output TerminalsInstalling Wire Spool And Adjusting Hub Tension Setting Gun Polarity For Wire TypeRear Panel Installing Gas SupplyVolts Positioning Jumper LinksHz Single Electrical Service GuideInput Voltage Min Grounding Conductor Size In AWGSelecting a Location And Connecting Input Power Wood Threading Welding WireOperation Turn Off unit, and disconnect input powerTurn Off unit Connecting Spool Gun To Welding Power SourceControls − OperationWhile welding Voltage switch positionWeld Parameters Number on left of slash To read settingsExample 2/40 = Disconnect power before maintaining Routine MaintenanceSupplementary Protectors MonthsRemoving Knob From Front Panel Replacing Drive Roll And Wire Inlet GuideTurn Off power Replacing Gun Contact Tip Turn Off power before replacing contact tipWire size stamped on tip − check and match wire size Turn off welding power source/wire feederReplacing Switch And/Or Head Tube Wire Drive/Gun Troubleshooting Table Welding Troubleshooting TableWire Drive/Gun Trouble Remedy Welding Trouble RemedyTypical MIG Process Connections − MIG Welding Gmaw GuidelinesWire Size Amperage Range Typical MIG Process Control SettingsThickness to Amperage a AmperageHolding And Positioning Welding Gun Conditions That Affect Weld Bead Shape Gun 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 BeadWire does not feed Troubleshooting Guide For Semiautomatic Welding EquipmentCommon MIG Shielding Gases ApplicationWelding arc not stable Wire slipping in drive rolls OM-192 440 − Electrical Diagram − Parts List REGULATOR/FLOWMETER, 10−50 CFH ARGON/CO2 Center Baffle w/Components Center Baffle w/Components -1Item Rear Panel w/Components Front Panel w/Components M-25 Gun Description Remarks Optional Spool Gun SwitchPage Assistance ServiceSupport Hobart Welding Products Contact your Distributor for