OM-194 199 Page 184-6. Replacing Gun Contact TipRef. 800 797-C Turn Off unit.1 Nozzle2 Contact TipCut off welding wire at contact tip.Remove nozzle.Remove contact tip and install newcontact tip. Reinstall nozzle.12Tools Needed:4-7. TroubleshootingWelding Trouble RemedyNo weld output; wire does not feed. Secure power cord plug in receptacle (see Section 2-12).Check and replace power switch if necessary.Check circuit breakers CB1 and/or CB2, and reset if necessary (see Section 4-2).Replace building line fuse or reset circuit breaker if open (see Section 2-12).Secure gun plug in receptacle or repair leads, or replace trigger switch (see Section 2-7 and/or 4-5).Thermostat TP1 open (overheating). Allow fan to run; the thermostat will close when the unit has cooled(see Section 2-3).No weld output; wire feeds. Connect work clamp to get good metal to metal contact.Replace contact tip (see Section 4-6).Low weld output. Connect unit to proper input voltage or check for low line voltage (see Section 2-12).Low, high, or erratic wire speed. Readjust front panel settings (see Section 3-1).Change to correct size drive roll (see Section 11-3).Readjust drive roll pressure (see Section 2-13).Replace inlet guide, contact tip, and/or liner if necessary (see Sections 4-3, and 4-4).Wire Drive/Gun Trouble RemedyElectrode wire feeding stops during Straighten gun cable and/or replace damaged parts (see Section 4-4).welding.Adjust drive roll pressure (see Section 2-13).Readjust hub tension (see Section 2-9).Replace contact tip if blocked (see Section 4-6).Clean or replace wire inlet guide or liner if dirty or plugged (see Section 4-4).Replace drive roll if worn or slipping (see Section 11-3).Secure gun plug in receptacle or repair leads, or replace trigger switch (see Section 2-7 and/or 4-5).Check and clear any restrictions at drive assembly and liner (see Section 4-4).Have nearest Factory Authorized Service Agent check drive motor.
