Lincoln Electric Power MIG 300 User Manual (English)

Questions and Answers:

A
Autumn MillerAug 13, 2025
Why does the input breaker keep tripping on my Lincoln Electric Welding System?
- B
  Brooke WeissAug 14, 2025
  If the input fuses keep blowing or the input breaker keeps tripping on your Lincoln Electric Welding System, it could be due to the welding procedure drawing too much output current, or the duty cycle being too high. To resolve this, reduce the output current, duty cycle, or both. Alternatively, there may be internal damage to the power source, in which case you should contact an authorized Lincoln Electric Service facility.
J
Jason BuckleyAug 17, 2025
What to do if the Lincoln Electric Welding System machine output is low?
- S
  Seth MejiaAug 17, 2025
  If the machine output of your Lincoln Electric Welding System is low, resulting in 'cold' welds with rounded or bumped-up beads, there are several potential causes: * The input voltage may be incorrect. Check and ensure it matches the nameplate rating and reconnect panel configuration. * The settings for wire feed speed and voltage may be incorrect for the process being used. Make sure they are properly set. * The output polarity may be incorrect for the process being used. Verify and correct the polarity. * There may be loose or faulty connections in the welding cables and gun assembly. Inspect and fix any connection issues.
J
James WalkerAug 21, 2025
How to fix wire bird nesting while welding with Lincoln Electric Power MIG 300 Welding System?
- K
  Kathleen TuckerAug 21, 2025
  If the wire is bird nesting while welding with your Lincoln Electric Welding System, it could be due to several reasons: * The torch liner conduit may not be fully inserted, preventing it from touching the inner black plastic wire guide. Ensure it's properly inserted. * The inner black plastic wire guide may be worn out and needs replacement. * The Push-Pull torch drive rolls may be set too tight. Refer to the owner's manual for the proper setting.
C
Corey HerreraAug 25, 2025
What to do if wire burns back to the tip during welding with Lincoln Electric Welding System?
- K
  Kenneth CoxAug 26, 2025
  If, during welding, the wire continues to burn back to the tip on your Lincoln Electric Welding System, consider the following: * Check that the spindle brake is not set too tight. * If using a POWER MIG 300, ensure the drive rolls are not set too tight; the tension arm should be set at 1 to 1-1/2. * Clean or replace the contact tip.
L
Lawrence CampbellAug 28, 2025
Why doesn't the gas flow when I pull the trigger on my Lincoln Electric Welding System?
- J
  Jeffrey MooreAug 28, 2025
  If gas does not flow when the gun trigger is pulled on your Lincoln Electric Welding System, ensure the gas supply is properly connected and turned 'on'. If the gas solenoid actuates (clicks) when the trigger is pulled, there may be a restriction in the gas supply line. Additionally, the gun cable assembly may be faulty and require checking or replacement.
B
Bryan RoseSep 1, 2025
What to do if Lincoln Electric Power MIG 300 Welding System has output voltage when the gun trigger is not pulled?
- C
  Craig ZunigaSep 1, 2025
  If output voltage and wire feed are present when the gun trigger is not pulled on your Lincoln Electric Welding System, check the Weld Mode to ensure the unit is in a CV Mode and not a CC Mode. If the issue persists, remove the gun assembly from the machine; if the problem is resolved, the gun assembly is faulty and needs repair or replacement.
J
Jennifer SellersSep 5, 2025
What does it mean when the thermal symbol is lit on my Lincoln Electric Power MIG 300 Welding System?
- K
  Kathy DuranSep 5, 2025
  If the thermal symbol is lit on your Lincoln Electric Welding System, check for proper fan operation and ensure there is no material blocking the intake or exhaust louvers.
J
James JoyceSep 8, 2025
How to troubleshoot a Lincoln Electric Welding System that will not power up?
- K
  Krista MyersSep 8, 2025
  If your Lincoln Electric Welding System will not power up (no lights), ensure that the power switch is in the "ON" position. Also, check the input voltage selection; if it was made improperly, power down the system and check the input voltage, then reconnect according to the diagram on the reconnect cover.

Lincoln Electric Power MIG 300 Specifications

General

Brand	Lincoln Electric
Model	Power MIG 300
Category	Welding System
Language	English

Summary

Safety Depends on You

OPERATOR'S MANUAL

SAFETY

CALIFORNIA PROPOSITION 65 WARNINGS

Warnings regarding engine exhaust constituents known to cause cancer or birth defects.

ARC WELDING HAZARDS

General safety warning for arc welding, stressing protection from injury or death.

ENGINE POWERED EQUIPMENT SAFETY

Specific safety precautions for operating engine-powered equipment.

ELECTRIC AND MAGNETIC FIELD DANGERS

Information on EMF hazards and minimizing exposure during welding.

SAFETY

ELECTRIC SHOCK HAZARDS

Detailed instructions to prevent electrical shock, including insulation and protective gear.

ARC RAY BURNS

Precautions to protect skin and eyes from burns caused by arc rays.

FUMES AND GASES HAZARDS

Safety measures to avoid inhaling dangerous welding fumes and gases.

SAFETY

WELDING SPARKS AND FIRE/EXPLOSION RISK

Guidelines to prevent fires and explosions from welding sparks and materials.

CYLINDER EXPLOSION HAZARDS

Safety precautions for handling compressed gas cylinders to prevent explosions.

ELECTRICALLY POWERED EQUIPMENT SAFETY

Electrical safety precautions for equipment powered by electricity.

SAFETY

FRENCH SAFETY PRECAUTIONS

General safety precautions for welding in French.

FRENCH ARC WELDING SAFETY

Specific arc welding safety instructions in French.

FRENCH TRANSFORMER/RECTIFIER SAFETY

Safety for welding machines in French.

Thank You

Equipment Information and Registration

Safety Statement Definitions

INSTALLATION

TECHNICAL SPECIFICATIONS

Provides detailed technical specifications of the POWER MIG 300.

INSTALLATION

GENERAL INSTALLATION SAFETY

Essential safety precautions before installation and operation.

MACHINE UNCRATING AND LOCATION

Procedures for uncrating the machine and selecting an optimal location.

INPUT POWER AND CONNECTIONS

Information on input power, grounding, and connection diagrams.

INSTALLATION

INPUT SUPPLY CONNECTION DIAGRAMS

Diagrams for single-phase input supply connections at various voltages.

RECEPTACLE DIAGRAM

Diagram illustrating receptacle connections for grounding and power.

INSTALLATION

GUN AND CABLE INSTALLATION

Instructions for attaching the welding gun and cable assembly.

LINER INSTALLATION AND TRIMMING

Guide for installing and trimming the gun's internal liner.

SHIELDING GAS SETUP

Procedure for connecting and setting up the shielding gas supply.

INSTALLATION

REGULATOR SAFETY WARNINGS

Critical warnings about oil, grease, or damage on regulators and cylinders.

CYLINDER VALVE OPERATION SAFETY

Safety advice for opening cylinder valves to avoid injury.

OPERATION

WELDING ABBREVIATIONS

Glossary of common welding abbreviations.

WELDING MODE DEFINITIONS

Explanations of non-synergic and synergic welding modes.

OPERATION

PRODUCT OVERVIEW AND FEATURES

Description of the POWER MIG 300's capabilities and available optional kits.

MACHINE CONTROLS AND SETTINGS

Explanation of the machine's meters, knobs, and display for settings.

OPERATION

VOLT/TRIM METER AND OUTPUT CONTROLS

Description of the Volt/Trim meter and the two encoder knobs for adjustments.

THERMAL INDICATOR AND MULTI-PROCESS PANEL

Explanation of the thermal light and the multi-process panel for mode selection.

OPERATION

SETTING UP FOR WELDING

Step-by-step guide for configuring the POWER MIG 300 for welding operations.

WELD PARAMETER ADJUSTMENT TABLE

Table indicating adjustable parameters for different weld modes.

OPERATION

MULTI-PROCESS PANEL FUNCTIONS

In-depth explanation of selecting weld modes and adjusting parameters.

PREFLOW, POSTFLOW, AND RUN-IN SETTINGS

Explanation of settings for shielding gas flow and arc start.

START PROCEDURE AND WIRE FEEDING

Details on start procedures (hot/cold) and wire feeding adjustments.

OPERATION

ARC CONTROL ADJUSTMENT

How to adjust arc control for various processes to modify arc characteristics.

ARC CONTROL SETTINGS TABLE

Table showing arc control settings and their results for different processes.

OPERATION

CRATER, BURNBACK, AND SPOT WELDING CONTROLS

Explanation of controls for crater filling, burnback, and spot welds.

WIRE DRIVE ROLL INFORMATION

Details on drive rolls, their selection, and matching to wire sizes.

OPERATION

CHANGING DRIVE AND IDLE ROLLS

Step-by-step guide for changing drive and idle rolls.

WIRE REEL AND SPOOL LOADING

Procedures for loading wire reels, spools, and coils onto the machine.

OPERATION

ELECTRODE WIRE FEEDING PROCEDURE

Instructions for feeding electrode wire through the gun.

IDLE ROLL PRESSURE SETTING GUIDE

Guidance on setting idle roll pressure for optimal wire feeding.

AVOIDING WIRE FEEDING PROBLEMS

Tips and procedures to prevent common wire feeding issues.

OPERATION

PULSE WELDING (GMAW-P)

Explanation of the pulsed-arc process and its benefits.

OPERATION

PULSE-ON-PULSE™ WELDING (GMAW-PP)

Detailed explanation of the Pulse-on-Pulse process for aluminum.

BENEFITS OF PULSE-ON-PULSE

Advantages of using the Pulse-on-Pulse feature from Lincoln Electric.

PULSE-ON-PULSE WELDING PROCEDURES

Table of recommended welding procedures for Pulse-on-Pulse.

OPERATION

POWER MODE™ WELDING PROCESS

Explanation of the Power Mode process for stable arc control.

POWER MODE WELDING PROCEDURES

Recommended procedures for Power Mode welding.

ACCESSORIES

DRIVE ROLL KITS AND ALUM FEEDING KIT

Details on drive roll kits and the aluminum feeding kit.

READI-REEL ADAPTER AND CYLINDER MOUNTING KIT

Information on Readi-Reel adapter and dual cylinder mounting kit.

MAGNUM GUN CONNECTION AND SPOOL GUN OPERATION

Details on Magnum gun connection and Spool Gun operation.

DUAL GUN OPERATION SAFETY AND SETUP

Safety and setup procedures for operating with multiple guns.

ACCESSORIES

NON-SYNERGIC AND SYNERGIC WELD MODES WITH SPOOL GUN

Setting up non-synergic and synergic modes with a spool gun.

PUSH-PULL FEEDING CONNECTION ADAPTER KIT

Information on the push-pull adapter kit and compatible torches.

WELDING WITH PRINCE XL/COBRA GOLD TORCH

Procedures for welding with specific torches.

MAINTENANCE

GENERAL MAINTENANCE AND SAFETY

General maintenance tasks and safety precautions.

DRIVE ROLLS AND GUIDE PLATES MAINTENANCE

Maintenance of drive rolls and guide plates.

CONTACT TIP, GAS NOZZLE, AND GUN CABLE MAINTENANCE

Maintenance for contact tips, nozzles, and gun cables.

MAINTENANCE

LINER REMOVAL AND REPLACEMENT

Step-by-step instructions for removing, installing, and trimming the gun liner.

TROUBLESHOOTING

TROUBLESHOOTING GUIDE OVERVIEW

Introduction to the troubleshooting guide and its three-step procedure.

SERVICE AND REPAIR WARNING

Warning about unauthorized repairs and the need for qualified personnel.

TROUBLESHOOTING CAUTION

Caution for users unsure about troubleshooting steps.

TROUBLESHOOTING

COMMON MACHINE PROBLEMS AND SOLUTIONS

Table listing common machine issues, potential causes, and recommended actions.

TROUBLESHOOTING

OUTPUT PROBLEMS DIAGNOSIS

Steps for diagnosing and resolving issues related to machine output.

TROUBLESHOOTING OUTPUT CAUTION

Caution for users performing output troubleshooting.

TROUBLESHOOTING

WIRE FEEDING PROBLEMS DIAGNOSIS

Steps for diagnosing and resolving wire feeding problems.

TROUBLESHOOTING FEEDING CAUTION

Caution for users performing wire feeding troubleshooting.

TROUBLESHOOTING

GAS FLOW PROBLEMS DIAGNOSIS

Steps for diagnosing and resolving gas flow issues.

TROUBLESHOOTING GAS FLOW CAUTION

Caution for users performing gas flow troubleshooting.

TROUBLESHOOTING

FAULT CODES AND DISPLAY MESSAGES

Table of fault codes, their descriptions, and display message interpretations.

TROUBLESHOOTING DISPLAY CAUTION

Caution for users interpreting display messages.

TROUBLESHOOTING

PUSH-PULL WIRE FEEDING PROBLEMS

Troubleshooting steps for push-pull wire feeding issues.

PUSH-PULL FEEDING CAUTION

Caution for users performing push-pull wire feeding troubleshooting.

TROUBLESHOOTING

PUSH-PULL WIRE FEEDING ISSUES

Further troubleshooting for push-pull wire feeding problems.

PUSH-PULL FEEDING CAUTION

Caution for users performing push-pull wire feeding troubleshooting.

TROUBLESHOOTING

PUSH-PULL WIRE FEEDING ISSUES

Additional troubleshooting for push-pull wire feeding problems.

PUSH-PULL FEEDING CAUTION

Caution for users performing push-pull wire feeding troubleshooting.

TROUBLESHOOTING

PUSH-PULL WIRE FEEDING PROBLEMS

Troubleshooting steps for push-pull wire feeding issues.

STALL FACTOR NUMBER ADJUSTMENT

Procedure for adjusting the stall factor number for push-pull wire feeding.

WIRING DIAGRAMS

WIRING DIAGRAM FOR CODE 10562

Wiring diagram specific to Power MIG 300, Code 10562.

WIRING DIAGRAM NOTES

Important notes regarding the accuracy and use of wiring diagrams.

WIRING DIAGRAMS

WIRING DIAGRAM FOR CODE 10952

Wiring diagram specific to Power MIG 300, Code 10952.

WIRING DIAGRAM NOTES

Important notes regarding the accuracy and use of wiring diagrams.

WIRING DIAGRAMS

WIRING DIAGRAM FOR CODES 10958 & 11000

Wiring diagram specific to Power MIG 300, Codes 10958 and 11000.

WIRING DIAGRAM NOTES

Important notes regarding the accuracy and use of wiring diagrams.

DIMENSION PRINT

WIRING DIAGRAM FOR CODES 11097 & 11098

Wiring diagram specific to Power MIG 300, Codes 11097 and 11098.

WIRING DIAGRAM NOTES

Important notes regarding the accuracy and use of wiring diagrams.

DIMENSION PRINT

MACHINE DIMENSIONS

Visual representation of the machine's physical dimensions.

NOTES

WARNING

General Safety Precautions (Multilingual)

Essential safety warnings presented in multiple languages for broad understanding.

Manufacturer's Instructions and Safety Practices

WARNING

Fumes, Servicing, and Guard Safety (Multilingual)

Safety warnings regarding fumes, servicing, and guards in multiple languages.

Manufacturer's Instructions and Safety Practices (Portuguese)

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Lincoln Electric Power MIG 300 User Manual

Table of Contents

Questions and Answers:

Lincoln Electric Power MIG 300 Specifications

Summary

Safety Depends on You

OPERATOR'S MANUAL

SAFETY

CALIFORNIA PROPOSITION 65 WARNINGS

ARC WELDING HAZARDS

ENGINE POWERED EQUIPMENT SAFETY

ELECTRIC AND MAGNETIC FIELD DANGERS

SAFETY

ELECTRIC SHOCK HAZARDS

ARC RAY BURNS

FUMES AND GASES HAZARDS

SAFETY

WELDING SPARKS AND FIRE/EXPLOSION RISK

CYLINDER EXPLOSION HAZARDS

ELECTRICALLY POWERED EQUIPMENT SAFETY

SAFETY

FRENCH SAFETY PRECAUTIONS

FRENCH ARC WELDING SAFETY

FRENCH TRANSFORMER/RECTIFIER SAFETY

Thank You

Equipment Information and Registration

Safety Statement Definitions

INSTALLATION

TECHNICAL SPECIFICATIONS

INSTALLATION

GENERAL INSTALLATION SAFETY

MACHINE UNCRATING AND LOCATION

INPUT POWER AND CONNECTIONS

INSTALLATION

INPUT SUPPLY CONNECTION DIAGRAMS

RECEPTACLE DIAGRAM

INSTALLATION

GUN AND CABLE INSTALLATION

LINER INSTALLATION AND TRIMMING

SHIELDING GAS SETUP

INSTALLATION

REGULATOR SAFETY WARNINGS

CYLINDER VALVE OPERATION SAFETY

OPERATION

WELDING ABBREVIATIONS

WELDING MODE DEFINITIONS

OPERATION

PRODUCT OVERVIEW AND FEATURES

MACHINE CONTROLS AND SETTINGS

OPERATION

VOLT/TRIM METER AND OUTPUT CONTROLS

THERMAL INDICATOR AND MULTI-PROCESS PANEL

OPERATION

SETTING UP FOR WELDING

WELD PARAMETER ADJUSTMENT TABLE

OPERATION

MULTI-PROCESS PANEL FUNCTIONS

PREFLOW, POSTFLOW, AND RUN-IN SETTINGS

START PROCEDURE AND WIRE FEEDING

OPERATION

ARC CONTROL ADJUSTMENT

ARC CONTROL SETTINGS TABLE

OPERATION

CRATER, BURNBACK, AND SPOT WELDING CONTROLS

WIRE DRIVE ROLL INFORMATION

OPERATION

CHANGING DRIVE AND IDLE ROLLS

WIRE REEL AND SPOOL LOADING

OPERATION

ELECTRODE WIRE FEEDING PROCEDURE

IDLE ROLL PRESSURE SETTING GUIDE

AVOIDING WIRE FEEDING PROBLEMS

OPERATION

PULSE WELDING (GMAW-P)

OPERATION

PULSE-ON-PULSE™ WELDING (GMAW-PP)

BENEFITS OF PULSE-ON-PULSE

PULSE-ON-PULSE WELDING PROCEDURES

OPERATION

POWER MODE™ WELDING PROCESS