Miller Electric 255 Replacing Switch And/Or Head Tube, Remove handle locking nut Slide handle

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4-7. Replacing Switch And/Or Head Tube

Y Disconnect gun first.

1Remove handle locking nut.

3 Slide handle.

2 Remove switch housing. Note: If installing new switch, push switch lead connectors onto terminal of new switch (polarity is not important). Install switch back into handle, and secure with handle locking nut. If replacing head tube, continue to end of figure.

4Secure head tube in vice.

5 Loosen jam nut. Remove from vice and turn head tube out by hand.

6Install existing shock washer onto new head tube. Hand-tighten head tube into connector cable.

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:

3/4 in

Ref. ST-800 795-C

OM-157 066 Page 19

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Contents Auto ArcR M-25 Gun Page Table of Contents Page Arc Welding Hazards Symbol UsageMarks a special safety message ARC Rays can burn eyes and skin Fire or Explosion hazard Principal Safety StandardsAbout Pacemakers EMF InformationStainless Steel SpecificationsWeight Volt-Ampere CurveOverheating Welding Power Source Duty Cycle And OverheatingExceeding duty cycle can damage unit and void warranty Welding Gun Duty Cycle And OverheatingInstalling Gas Supply Installing Work ClampRef. ST-800 921-C Positioning Jumper Links Setting Gun PolaritySelecting a Location And Connecting Input Power Electrical Service GuideScale Threading Welding WireControls For Standard Units Front Panel ControlsCenter Baffle Controls Do not Switch Under LoadWeld Parameter Chart OM-157 066 Circuit Breaker CB1 Routine MaintenanceDisconnect power MonthsReplacing Gun Contact Tip Changing Drive Roll And Wire Inlet GuideTurn Off unit, and disconnect input power Fuses F1 And F2To Reassemble Gun Cleaning Or Replacing Gun LinerDisconnect gun first Remove handle locking nut Slide handle Replacing Switch And/Or Head TubeWelding Trouble Remedy TroubleshootingElectrical Diagram OM-157 066 Parts List 089 Baffle, Center w/Components Baffle, Center w/Components -1 Item Wire Drive And Gears Drive Roll And Wire Guide Kits Wire Drive And Gears -2 Item Panel, Rear w/Components Panel, Front w/Components Exploded View Of Gun Exploded View Of Gun Item Page Page Warranty Owner’s Record