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Miller Electric XR A, XR W manual Replacing Hub Assembly

Models: XR A XR W

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6-9. Replacing Hub Assembly

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Turn Off wire feeder and welding power source. Remove gun top cover and open pressure roll assembly as shown in Section 6-4.

Retract wire onto spool and remove spool. Take hub apart as shown.

1Metal Brake Washer

2Flat Washer

3Brake Washer

4Hub

5Keyed Washer

6Spring

7Cap Screw

8Retaining Ring

Replace broken or worn parts and slide parts onto shaft as shown.

Adjust hub tension (see Section 6-10). Thread welding wire (see Section4-14). Close and latch door.

Close gun pressure roll assembly and reinstall gun cover.

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Tools Needed:	7 8
	7/16 in

151 778-B / Ref. 143 223-A

OM-1581 Page 35

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Miller Electric XR A, XR W manual Replacing Hub Assembly, Close gun pressure roll assembly and reinstall gun cover

Contents

File MIG Gmaw OM-1581137 532YProcesses Description From Miller to You Table of Contents Spot Controls Optional Troubleshooting Electric Shock can kill Symbol UsageMarks a special safety message Arc Welding Hazards Buildup of GAS can injure or kill ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal can injure eyes California Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers UNE Décharge Électrique peut entraîner la mort LES Fumées ET LES GAZ peuvent être dangereuxIndique un message de sécurité particulier DES Pièces Chaudes peuvent provoquer des brûlures graves LE Soudage peut provoquer unIncendie ou une explosion DES Particules Volantes peuvent blesser les yeux DES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peut SUR En ce qui concerne les stimulateurs cardiaques Principales normes de sécurité Duty Cycle And Overheating − SpecificationsWire Feeder Specifications Gun Specifications − Installation Constant Voltage CV Weld- ing Power Source Plug Removing Top Cover Of Pistol Grip Gun Top Cover Triangular BossPush door back into original posi- tion to close Air-Cooled Gun Connections Water-Cooled Gun Connections Regulator Air-Cooled Feeder Connections Supply Fitting On Regulator Water-Cooled Feeder ConnectionsTop View Rear Panel Return Fitting On Voltage Sensing Lead Connections Reinstall right side panel 11 VAC/Contactor Control Plug Information Source, and install plug onto Pins a & B of PLG5Or -4, install 5-pin or Receptacle on welding power Installing Wire Spool Threading Welding Wire Through Feeder Coolant Guidelines Threading Welding Wire Through Gun Adjusting Wire Feed Starting Speed Work And Voltage Sensing Cable Clamps Safety Equipment− Operation Front Panel Controls Of Feeder Air-Cooled Model Shown Jog Switch Voltage/Wire Speed Switch And Meter OptionalRun-In Speed Control Power Switch Spot Controls OptionalRemote Voltage Control Optional Internal Controls Flowmeter Optional Sequence Of Gas Metal Arc Welding Gmaw − Continuous Or Spot Gun ControlsShielding Gas Coolant Supply For Water-Cooled Models Only Months − Maintenance & TroubleshootingRoutine Maintenance Turn Off all power before maintaining Changing Or Cleaning Gun Drive Roll Changing Feeder Drive Roll And Wire Inlet Guide Close pressure roll assembly. Close and latch door Removing Diffuser In Air And Water-Cooled Pistol-Grip Guns Changing Gun Contact Tip Drive Roll Collet Nut Turn Off welding power source and wire feederReplacing The Liner Split End Close gun pressure roll assembly and reinstall gun cover Replacing Hub Assembly Adjusting Hub Tension Water Flow Switch Optional For Water-Cooled ModelsOverload Protection Wire Feeder Trouble Troubleshooting Reinstall current pick-up tab if applicable see Section Filter, and clean fittings see SectionGun Trouble Circuit Diagram For Wire Feeder − Electrical Diagrams Circuit Diagram For Gun OM-1581 − Parts List 12 13 9 10 17 18 1745 46 Dia Part Description Quantity Mkgs CB1 Includes Items Motor & Wire Drive -1 Item Panel, Front w/Components Water-Cooled Model Illustrated Panel, Front w/Components -1 Item 38Fig Items 24Includes PLG20 136 Head Tube Assembly Of Pistol-Grip Gun Number − Parts List Including Consumables Heavy Duty FasTiptContact Tips Extra Heavy Duty FasTiptContact TipsTapered FasTipt Contact Tips Head Tube Assemblies Gas DiffusersInsulators Barrel Assemblies Service Your distributor also givesSupport Your distributor and/or equipment manufacturer’s To locate a Distributor or Service Agency visitMiller Electric Mfg. Co For assistance in filing or settling claims, contact