Lincoln Electric 170I manual Component Replacement Procedures, Changing the Contact TIP

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	D-2		MAINTENANCE		D-2

COMPONENT

REPLACEMENT

PROCEDURES

CHANGING THE CONTACT TIP

1.Refer to Figure D.2. Remove the gas nozzle from the gun by unscrewing counter-clockwise.

2.Remove the existing contact tip from the gun by unscrewing counter-clockwise.

3.Insert and hand tighten desired contact tip.

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 .023"-.025" (0.6 mm) position.

If .030"/.035" (0.8/0.9 mm) 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

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.

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

.030/.035" (0.8/0.9 mm) groove (the larger 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.

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Handymig 170i

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Contents Handymig For Engine powered equipment SafetyElectric and Magnetic Fields may be dangerous Iii Electric Shock can killARC Rays can burn Fumes and Gases can be dangerousWelding Sparks can cause fire or explosion Cylinder may explode if damagedAssessment of Area Instructions for ELECTRO- Magnetic CompatibilityPlease Examine Carton and Equipment For Damage Immediately Table of Contents Section F ViiiSection D Section ETechnical Specifications Handymig InstallationIdentify and Locate Components Safety PrecautionsStacking Work Clamp InstallationSelect Suitable Location Output ConnectionsGAS Connection GUN InstallationWork Cable Installation Connecting Gun Cable to the HandymigFigure A.5 Input ConnectionsLine Cord Connection Electrical Input Connection For Rated OutputGeneral Description Design Features AdvantagesOperational Features and Controls OperationLimitations Controls and SettingsWelding Capability Sequence of Operation Wire LoadingWelding Operations Figure B.4 Wire ThreadingMaking a Weld Cleaning Tip And NozzleProcess Guidelines Shielding Gas Changing Machine Over to Feed Other Wire SizesWelding with Gmaw MIG Welding with Fcaw InnershieldLearning to Weld Learning to WeldOverload Protection Gmaw MIG Welding ARC SELF-SHIELDED Fcaw Welding ARCJoint Types and Positions Process SelectionCommon Metals Fillet Welds Welding In The Vertical PositionPenetration Correct Welding Position Machine SET UP for the SELF-SHIELDED Fcaw ProcessWelding Techniques for the SELF- Shielded Fcaw Process Vertical-down WeldingCorrect Welding Speed Correct Electrical Stickout ESOPractice Helpful HintsWelding Techniques for the Gmaw MIG Process Machine SET UP for the Gmaw MIG ProcessFor the Handymig 170i, use the following To Eliminate Stubbing* in order of importance Troubleshooting WeldsTo Eliminate a Ropy Convex Bead To Correct Poor Penetration in order of impor- tanceProper Gun Handling Application Chart GUN and Cable Maintenance MaintenanceRoutine Maintenance Changing Drive Roll Component Replacement ProceduresChanging the Contact TIP Liner trim length Changing LinerGUN Handle Parts Ground Test Procedure HOW to USE Troubleshooting Guide 1TROUBLESHOOTINGE-1Recommended Course of Action TroubleshootingTroubleshooting Guide Problems Possible Areas Symptoms MisadjustmentsContact your local Liquid Arc Authorized Field Service FacilityWelding Problems Handymig 170i Wiring Diagram Code Wiring DiagramsPrecaucion Warnung Copyright 2000 Lincoln Global Inc