Hobart Welding Products OM-227 978B Maintenance &TROUBLESHOOTING, Routine Maintenance, Months

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SECTION 7 − MAINTENANCE &TROUBLESHOOTING

7-1. Routine Maintenance

			Y Disconnect power	. Maintain more often
			before maintaining.	during severe conditions.
n = Check	Z = Change	~ = Clean	l = Replace	Reference
* To be done by Factory Authorized Service Agent

l Unreadable Labels

~ Weld Terminals

l Damaged Gas Hose

nl Weld Cables

Every

3 Months

	nl Cords	nl Gun Cables
	Every
	6	OR
	Months	OR
	Months

~Drive Rolls

~Inside Unit

7-2. Overload Protection

1

7-3. Drive Motor Protection

1 Supplementary Protector CB1

CB1 protects unit from overload. If CB1 opens, unit shuts down.

Reset supplementary protector.

802 441

Drive motor protection circuit protects drive motor from overload. If drive motor becomes inoperative, release gun trigger and wait until protection circuit resets allowing drive motor to feed wire again.

OM-227 978 Page 22

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Contents Description OM-227 978BProcesses 2007−04From Hobart to You Table of Contents Typical MIG Process Connections − Parts List− MIG Welding Gmaw Guidelines Arc Welding Hazards Symbol UsageMarks a special safety message Electric Shock can killFlying Metal can injure eyes ARC Rays can burn eyes and skinWelding can cause fire or explosion 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 DES Pièces Chaudes peuvent provoquer des brûlures graves LE Soudage peut provoquer un incendie ou une explosionDES Particules Volantes peuvent blesser les yeux LE Bruit peut endommager l’ouïe’EMPLOI Excessif peut SUR Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresBoulevard, Rexdale, Ontario, Canada M9W 1R3 téléphone En ce qui concerne les stimulateurs cardiaquesSpecifications − SpecificationsSymbols And Definitions − DefinitionsAmperes Duty Cycle And OverheatingVolt-Ampere Curves OutputInstalling Work Clamp − InstallationInstalling Welding Gun Process/Polarity Table Changing PolarityInstalling 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 Connecting Optional Spool Gun Appropriate settingThreading Welding Wire − Operation ControlsWeld Parameter Chart For 230 VAC Model 227 949-B Overload Protection Drive Motor Protection − Maintenance &TROUBLESHOOTINGRoutine Maintenance MonthsReplacing Gun Contact Tip Changing Drive Roll Or Wire Inlet GuideTurn Off power before replacing contact tip 030/.035 Groove Stamped 023/.025 Groove Stamped .030/.035To Reassemble Gun Cleaning Or Replacing Gun LinerDisconnect gun from unit Replacing Switch And/Or Head Tube Troubleshooting Table Trouble RemedyOM-227 978 − Electrical Diagram Circuit Diagram227 951-B − MIG Welding Gmaw Guidelines Typical MIG Process ConnectionsThickness to Amperage a Typical MIG Process Control SettingsWire Size Amperage Range AmperageHolding And Positioning Welding Gun Perpendicular Drag Conditions That Affect Weld Bead ShapePush Short Normal LongGun Movement During Welding Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Troubleshooting − Excessive Penetration Troubleshooting − Excessive SpatterTroubleshooting − Porosity Possible Causes Corrective ActionsTroubleshooting − Burn-Through Troubleshooting − Lack Of PenetrationTroubleshooting − Incomplete Fusion Common MIG Shielding Gases Troubleshooting − Waviness Of BeadTroubleshooting − Distortion Weld beadTroubleshooting Guide For Semiautomatic Welding Equipment OM-227 978 − Parts List Main AssemblyDia Part Dia Part Mkgs Description Quantity H-14 Gun 231Consumables Optional Drive RollsOptions Page Work like a Pro Assistance ServiceSupport Contact your Distributor for Hobart Welding Products