Hobart Welding Products TM-944C manual GS1 if necessary, Clear blockage in gun

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Trouble	Remedy

No weld output; wire feeds.	Connect work clamp to get good metal-to-metal contact.

	Replace gun contact tip (see Section 7-5).

	Check thumbscrew securing gun end to feedhead adapter and tighten if necessary.

Low weld output.	Connect unit to proper input voltage or check for low line voltage.

	Place Voltage switch S2 in desired position (see Section 4-1).

Low or erratic wire speed.	Readjust weld parameter settings.

	Change to correct size drive roll.

	Readjust drive roll pressure.

	Clean or replace wire inlet guide or liner if dirty or plugged (see Section 7-4and/or 7-6).

	Readjust wire reel hub tension.

	Check voltage and connections of wire drive motor. Replace motor if necessary.

Improper or no shielding gas flow.	Clean or replace gas hose.

	Check shielding gas valve GS1 for proper coil voltage and connections. Check continuity of coil. Replace
	GS1 if necessary.

	Clear blockage in gun.

Handler 135 / 175

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TM-944 Page 21

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Contents Description TM-944CProcesses Table of Contents Servicing Hazards − Safety Precautions for ServicingSymbol Usage Overuse can cause Overheating California Proposition 65 WarningsEMF Information Radiation can cause interferenceVAC Model − SpecificationsSpecifications Output Amperes Duty Cycle And OverheatingOutput Duty Cycle %Volt-Ampere Curves Installing Welding Gun Installing Work Clamp − InstallationChanging Polarity Electrode Negative For Flux Core WireFor Solid Wire Process/Polarity TableInstalling Gas Supply Up to 200 ft 61 m Rating LabelGrounded Receptacle Volt, 20 ampere individualL2 L1 230 VAC Do not move or operate unit where it could tip18 in 457 mm of space for airflow = GND/PEReference 1996 National Electrical Code NEC Electrical Service Guide For 230 VAC ModelInstalling Wire Spool And Adjusting Hub Tension 230Reinstall contact tip and nozzle Threading Welding WirePressure Indicator Scale Be sure that tip matches wire diameterControls Voltage SwitchPower Switch − OperationWeld Parameter Chart For 115 VAC Model While Starting Value only − Wire Speed Setting Can beWire Speed Also Depends on Other variables Such Stick Out Electrode Positive For Solid WireWeld Parameter Chart For 230 VAC Model Metal Etc Listed Starting Value Only − Wire Speed Setting can be− Theory of Operation Polarity Block Wire Drive MotorStablizer L1 MainTroubleshooting Table − TroubleshootingClear blockage in gun GS1 if necessaryTM-944 V8/R5 V9/R6 V10 V11/R9640 030/.035 Solid585 Or Flux CoreHandler 135 Test Equipment Needed700 510600 Control Board PC1 Testing Information 115 VAC Model Circuit common Control Board PC1 Test Point Values 115 VAC ModelControl Board PC1 Testing Information 230 VAC Model Control Board PC1 Test Point Values 230 VAC Model Overload Protection Drive Motor Protection − MaintenanceRoutine Maintenance Disconnect power before maintainingReplacing Gun Contact Tip Changing Drive Roll Or Wire Inlet GuideTurn Off power before replacing contact tip To Reassemble Gun Cleaning Or Replacing Gun LinerDisconnect gun from unit Replacing Switch And/Or Head Tube Model Serial Or Style Number Circuit Diagram Wiring Diagram − Electrical Diagrams194 324-C 194 325-A 196 637-A 196 655-A 195 890-A 195 891-A Handler 135 H-10 Gun 11 10 − Parts ListDia Part Mkgs Description Quantity Optional 195 Optional Drive RollsOptions Hobart Welding Products