Lincoln Electric IM795 manual Component Replacement Procedures, Changing Drive Roll

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D-3

MAINTENANCE

D-3

COMPONENT

REPLACEMENT

PROCEDURES

CHANGING THE CONTACT TIP (These instructions pertain to the Lincoln Electric® gun. The instructions for the Magnum™ 100L gun, are similar except that the gas nozzle is threaded.)

1.Refer to Figure D.2a or D.2b. Remove the gas noz- zle from the gun by pulling and rotating it clockwise off the diffuser. (Threadless slip fit).

2.Remove the existing contact tip from the gun by gripping it with pliers and twisting counter-clock- wise. Tip will now slip out of diffuser.

3.Insert new tip into diffuser. Grip it with pliers, push tip into diffuser until it bottoms, then twist clockwise to tighten.

4.Replace gas nozzle.

CHANGING DRIVE ROLL

The drive roll has two grooves; one for .023" – .025" (0.6 mm) solid steel electrode and a larger groove for

.030" (0.8 mm) solid and .035" (0.9 mm) flux-cored steel electrode. As shipped, the drive roll is installed in the .030"-.035" (0.8/0.9mm) position.

If .023"/.025" (0.6mm) wire is to be used, the drive roll must be reversed as follows:

1.Connect the machine to its rated input power per instructions in Installation section.

2.Release the spring-loaded pressure arm and lift the idle roll arm away from the drive roll.

3.Turn the power switch to ON (marked “I”).

4.Set the wire speed to minimum and jog the drive unit with the trigger switch until the drive roll set screw is facing up.

CAUTION

7.Remove the drive roll, flip over and reinstall with the

.023/.025" (0.6mm) groove (the smaller groove) closest to the gearbox.

8.Push a length of straightened welding wire through the wire feeder guide tubes and adjust the position of the drive roll so that the groove is centered on the wire. Make certain the set screw is located on the flat portion of the shaft and tighten.

FIGURE D.1

3

2

1

When inching the welding wire, the drive rolls, gun connector block, and gun contact tip are energized relative to work and ground and remain energized for several seconds after the gun trig- ger is released.

5.Turn the power switch to OFF (marked “O”).

6.Loosen the drive roll set screw with the 5/64" (2.0 mm) hex wrench supplied.

SP 170-I

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Contents IM795 California Proposition 65 Warnings SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéSafety Safety Vii Please Examine Carton and Equipment For Damage ImmediatelyOn-Line Product Registration Table of Contents Installation Safety Precautions Identify and Locate ComponentsElectric Shock can kill Stacking Select Suitable LocationLimitations Output ConnectionsGAS Connection GUN InstallationWork Cable Installation Connecting Gun Cable to the SPInput Connections Power Input Cable230 50/60 Line Cord ConnectionGeneral Description Design Features AdvantagesOperational Features and Controls OperationControls and Settings Switch while weldingWelding Capability Sequence of Operation Wire LoadingFriction Brake Adjustment Welding OperationsFigure B.4 Cleaning Tip And Nozzle Process GuidelinesMaking a Weld Changing Machine Over to Feed Other Wire Sizes Welding with Gmaw MIGOverload Protection Application Chart Output PolarityDrive Roll Orientation K491 .045 1.2 mm Innershield Welding Kit AccessoriesOptional Accessories K464 .035 0.9 mm Innershield Welding KitReplacement Parts Complete Gun and Cable Assembly CodeMIG Gmaw Conversion Maintenance Maintenance Safety PrecautionsRoutine Maintenance Contact Tip Cable Liner Drive Roll GUN and Cable MaintenanceConfiguration of Components in Wire Feeding System Gun Cable CleaningChanging Drive Roll Component Replacement ProceduresFigure D.2a Liner trim length for gun Lincoln Electric Changing LinerGUN Handle Parts Magnum 100L GUN Handle Parts Lincoln ElectricHOW to USE Troubleshooting Guide TroubleshootingRecommended Course of Action Problems Possible Areas Symptoms MisadjustmentsGAS Flow Problems Welding Problems Wiring Diagrams Page Page Precaucion Warnung
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