Hobart Welding Products TM-944C 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 Drive Roll

2

Tools Needed:

3

4

The drive roll consists of two differ- ent sized grooves. The stamped markings on the end surface of the drive roll refers to the groove on the opposite side of the drive roll. The groove closest to the motor shaft is the proper groove to thread (see Section 3-10).

4 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.

.030/.035 Groove

Stamped .024

.024 Groove

Stamped .030/.035

Ref. 802 444-B

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

Handler 135 / 175

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TM-944 Page 31

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Contents TM-944C ProcessesDescription Table of Contents − Safety Precautions for Servicing Symbol UsageServicing Hazards EMF Information California Proposition 65 WarningsRadiation can cause interference Overuse can cause Overheating− Specifications SpecificationsVAC Model Output Duty Cycle And OverheatingDuty Cycle % Output AmperesVolt-Ampere Curves Installing Welding Gun Installing Work Clamp − InstallationFor Solid Wire Electrode Negative For Flux Core WireProcess/Polarity Table Changing PolarityInstalling Gas Supply Grounded Receptacle Rating LabelVolt, 20 ampere individual Up to 200 ft 61 m18 in 457 mm of space for airflow Do not move or operate unit where it could tip= GND/PE L2 L1 230 VACInstalling Wire Spool And Adjusting Hub Tension Electrical Service Guide For 230 VAC Model230 Reference 1996 National Electrical Code NECPressure Indicator Scale Threading Welding WireBe sure that tip matches wire diameter Reinstall contact tip and nozzlePower Switch Voltage Switch− Operation ControlsWeld Parameter Chart For 115 VAC Model Wire Speed Also Depends on Other variables Such Stick Out Starting Value only − Wire Speed Setting Can beElectrode Positive For Solid Wire WhileWeld Parameter Chart For 230 VAC Model Metal Etc Listed Starting Value Only − Wire Speed Setting can be− Theory of Operation Stablizer L1 Block Wire Drive MotorMain PolarityTroubleshooting Table − TroubleshootingClear blockage in gun GS1 if necessaryTM-944 V8/R5 V9/R6 V10 V11/R9585 030/.035 SolidOr Flux Core 640Handler 135 Test Equipment Needed510 600700 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 Routine Maintenance − MaintenanceDisconnect power before maintaining Overload Protection Drive Motor ProtectionChanging Drive Roll Or Wire Inlet Guide Turn Off power before replacing contact tipReplacing Gun Contact Tip Cleaning Or Replacing Gun Liner Disconnect gun from unitTo Reassemble Gun 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 Optional Drive Rolls Options195 Hobart Welding Products