Replacing Switch And/Or Head Tube | Hobart Welding Products TM-944C

7-7. 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

Handler 135 / 175

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Hobart Welding Products TM-944C manual Replacing Switch And/Or Head Tube

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 interference VAC Model − SpecificationsSpecifications Output Amperes Duty Cycle And OverheatingOutput Duty Cycle % Volt-Ampere Curves Installing Welding Gun Installing Work Clamp − Installation Changing Polarity Electrode Negative For Flux Core WireFor Solid Wire Process/Polarity Table Installing Gas Supply Up to 200 ft 61 m Rating LabelGrounded Receptacle Volt, 20 ampere individual L2 L1 230 VAC Do not move or operate unit where it could tip18 in 457 mm of space for airflow = GND/PE Reference 1996 National Electrical Code NEC Electrical Service Guide For 230 VAC ModelInstalling Wire Spool And Adjusting Hub Tension 230 Reinstall contact tip and nozzle Threading Welding WirePressure Indicator Scale Be sure that tip matches wire diameter Controls Voltage SwitchPower Switch − Operation Weld 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 Wire Weld 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 Main Troubleshooting Table − Troubleshooting Clear blockage in gun GS1 if necessary TM-944 V8/R5 V9/R6 V10 V11/R9 640 030/.035 Solid585 Or Flux Core Handler 135 Test Equipment Needed 700 510600 Control Board PC1 Testing Information 115 VAC Model Circuit common Control Board PC1 Test Point Values 115 VAC Model Control 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 maintaining Replacing 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 Diagrams 194 324-C 194 325-A 196 637-A 196 655-A 195 890-A 195 891-A Handler 135 H-10 Gun 11 10 − Parts List Dia Part Mkgs Description Quantity Optional 195 Optional Drive RollsOptions Hobart Welding Products