Page 2 - SAFETY; WARNING; CALIFORNIA PROPOSITION 65 WARNINGS; The Above For Diesel Engines
FOR ENGINEpowered equipment. 1.a. Turn the engine off before troubleshooting and maintenance work unless the maintenance work requires it to be running. ____________________________________________________ 1.b. Operate engines in open, well-ventilated areas or vent the engine exhaust fumes outdoors....
Page 4 - Refer to
FOR ELECTRICALLYpowered equipment. 8.a. Turn off input power using the disconnect switch at the fuse box before working onthe equipment. 8.b. Install equipment in accordance with the U.S. National Electrical Code, all local codes and the manufacturer’srecommendations. 8.c. Ground the equipment in ac...
Page 5 - PRÉCAUTIONS DE SÛRETÉ
PRÉCAUTIONS DE SÛRETÉ Pour votre propre protection lire et observer toutes les instructions et les précautions de sûreté specifiques qui parraissent dans ce manuel aussi bien que les précautions de sûreté générales suiv- antes: Sûreté Pour Soudage A L’Arc 1. Protegez-vous contre la secousse électriq...
Page 6 - Thank You; Please Examine Carton and Equipment For Damage Immediately
v v Thank You for selecting a QUALITY product by Lincoln Electric. We want you to take pride in operating this Lincoln Electric Company product••• as much pride as we have in bringing this product to you! Read this Operators Manual completely before attempting to use this equipment. Save this manual...
Page 7 - vi; TABLE OF CONTENTS
LN-7 & LN-7 GMA vi TABLE OF CONTENTS Page Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i-iv Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section A Technic...
Page 8 - INSTALLATION; TECHNICAL SPECIFICATIONS – LN-7 and LN-7 GMA
A-1 LN-7 & LN-7 GMA A-1 INSTALLATION TECHNICAL SPECIFICATIONS – LN-7 and LN-7 GMA DUTY CYCLE: INPUT VOLTAGE WIRE FEED SPEED WIRE DIAMETERS PHYSICAL DIMENSIONS Supplied by power source: 115 VAC, 50/60 Hz, 2.5 Amps LN-7 GMA 75 to 700 in. per minute (1.90 to 17.8 m/min) LN-7 50 to 500 in. per minut...
Page 9 - MOUNTING LOCATION
A-2 INSTALLATION LN-7 & LN-7 GMA A-2 MOUNTING LOCATION The LN-7 and LN-7 GMA wire feeder can be mounteddirectly on top of the power source providing that it issecure and level. It can also be mounted to anundercarriage when portability is required. MACHINE GROUNDING The LN-7 and LN-7 GMA wire fe...
Page 27 - WORK CABLE; GUN AND CABLE ASSEMBLIES
A-20 INSTALLATION LN-7 & LN-7 GMA A-20 WORK CABLE Connect a work lead of sufficient size and length(Table A.2) between the proper output stud on thepower source and the work. Be sure the connection tothe work makes tight metal-to-metal electrical contact.Poor work lead connections can result in ...
Page 29 - SHIELDING GAS HOOKUP
A-22 INSTALLATION LN-7 & LN-7 GMA A-22 SHIELDING GAS HOOKUP (LN-7 GMA or LN-7 with Optional K494 Gas SolenoidInstalled) Gas under pressure is explosive. Always keep gascylinders in an upright position and to theundercarriage or a stationary support. SeeAmerican National Standard Z-49.1, “Safety ...
Page 30 - OPERATION; GENERAL DESCRIPTION
B-1 OPERATION B-1 GENERAL DESCRIPTION The K440 LN-7 GMA semiautomatic constant speedwire feeder is specifically equipped for gas metal arcwelding using flux-cored Outershield electrodes andsolid wire. The LN-7 GMA is also suitable for self-shielded flux-cored Innershield electrodes, submergedarc wel...
Page 31 - CONTROLS AND SETTINGS
B-2 OPERATION B-2 RECOMMENDED PROCESSES ANDEQUIPMENT The LN-7 GMA is recommended for use in MIG andInnershield welding applications, the LN-7 isrecommended for Innershield welding applications.Both are recommended for use with constant voltagepower sources such as the Idealarc DC-250, 400, or600, or...
Page 32 - CIRCUIT PROTECTION
B-3 OPERATION B-3 PURGE - COLD INCH SWITCH (OPTIONAL). Thiscontrol, located on the optional K418 GMA Timer Kit,provides control of some wire feeder functions withoutenergizing the welding power source. The momentaryup position energizes the gas solenoid but not the wirefeeder or welding power source...
Page 35 - GUIDE TUBE DETAIL
B-6 OPERATION B-6 LN-7 & LN-7 GMA FIGURE B.3 – INSTALLING DRIVE ROLLS ON A FOUR-ROLL FEEDER. CLAMPINGCOLLAR SPACER (IFREQUIRED) DRIVE ROLL HALVES KEY OUTPUTSHAFT OUTGOING GUIDE TUBE INSERT OUTGOING GUIDE TUBE IDLE ROLL SMALL RADIUS MIDDLE GUIDE TUBE DRIVEROLL LARGE RADIUS GUIDE TUBE DETAIL
Page 36 - IDLE ROLL PRESSURE SETTING
B-7 OPERATION B-7 IDLE ROLL PRESSURE SETTING The idle roll pressure is set at the factory. Two-rollfeeders are set with the pressure adjustment knobbacked out two turns from full pressure, and four-rollfeeders are set backed out three turns. This is anapproximate setting. For small wire sizes andalu...
Page 37 - WIRE LOADING
B-8 OPERATION B-8 WIRE LOADING WIRE REEL LOADING – READI-REELSAND SPOOLS TO MOUNT A 30 LB READI-REEL PACKAGEUSING THE MOLDED PLASTIC K363-P TYPEADAPTER: 1. Make certain that the threaded locking collar is tight and securely locks the adapter on thespindle. See Figure B.5. 2. Rotate the spindle and a...
Page 39 - CAUTION
B-10 OPERATION B-10 WIRE REEL LOADING – 50 AND 60 LBCOILS (K303 OR K376 WIRE REEL STAND) ADJUSTABLE WIRE REEL BRAKE The mount for standard 50 and 60 pound electrodecoils includes a two-position brake assembly.Generally the brake should be at the inner position(nearest to the wire reel shaft) for wir...
Page 41 - ACCELERATION SETTING
B-12 OPERATION B-12 ACCELERATION SETTING The LN-7 and LN-7 GMA can be configured foroptimum starting for different procedures by selectingbetween two speeds of controlled wire acceleration. Asshipped from the factory, the LN-7 and LN-7 GMAmodels are set for fast acceleration. Fast accelerationis typ...
Page 42 - MAKING A WELD
B-13 OPERATION B-13 MAKING A WELD 1. Inch the electrode through the gun and cable. For solid wire, cut the electrode within approximately3/8 in. of the end of the contact tip. If using coredwire, cut the electrode within 3/4 in. of theextension guide. 2. Connect the work cable to the metal to be wel...
Page 43 - FLUX TANK LOADING
B-14 OPERATION B-14 FLUX TANK LOADING K320 FLUX TANK (OPTIONAL) Either turn off the incoming air line or remove the quickdisconnect if one has been installed. Slightly loosenthe tank cap and let the air in the tank escape in theholes in the side of the cap. After pressure has beenreleased, remove th...
Page 44 - ACCESSORIES; GENERAL
C-1 ACCESSORIES C-1 GENERAL The following is a list of the accessories that can beused with the LN-7 GMA wire feeder. LN-7 & LN-7 GMA Product Number Name K162-1** Spindle Kit-Two inch Hub K163** Undercarriage K419** Burnback timer kit K418** GMA Timer Kit K417** Digital voltmeter kit K320** Flux...
Page 45 - K419 BURNBACK TIMER KIT
C-2 ACCESSORIES C-2 AUXILIARY EQUIPMENTCONNECTION The power for 115 volt AC auxiliary equipment can beobtained from the 7 and 32A terminals inside thecontrol box. The 7 and 32A circuit is energized whenthe gun trigger circuit is closed. NOTE: The LN-7 GMA already has the factory installedgas solenoi...
Page 46 - WELDING GUNS; INNERSHIELD GUNS; POWER INPUT CABLES; K417 DIGITAL VOLTMETER KIT
WELDING GUNS INNERSHIELD GUNS The K126 gun and cable assembly is recommendedfor most welding with 0.062 in. through 3/32 in.Innershield electrodes at up to 350 amps. Install theinsulated nozzle extension (or thread protector) andthe nozzle contact tip for the stickout and electrodesize being used. (...
Page 47 - K527 WATER SOLENOID KIT
SUBMERGED ARC GUNS The K112 gun and cable assembly is recommendedfor welding with 1/16 in. solid steel electrode at up to500 amps. The K113 gun and cable is recommendedfor 5/64 in. and 3/32 in. (2.0 and 2.4 mm) solid steelelectrodes (types L50, L60, L61, and L70) for use up to600 amps. GMAW GUNS An ...
Page 48 - MAINTENANCE; ROUTINE MAINTENANCE; DRIVE ROLLS AND GUIDE TUBES; PERIODIC MAINTENANCE; WIRE DRIVE MOTOR AND GEARBOX
D-1 MAINTENANCE D-1 ROUTINE MAINTENANCE DRIVE ROLLS AND GUIDE TUBES After feeding every coil of wire, inspect the drive rollsection. Clean the assembly as necessary. Do notuse solvent to clean the drive roll assembly as it maywash the lubricant out of the bearings. The drive rollsand guide tubes are...
Page 51 - LN-7 SEQUENCE OF OPERATION (Optional Timer Kit not Installed)
D-4 MAINTENANCE LN-7 & LN-7 GMA D-4 LN-7 SEQUENCE OF OPERATION (Optional Timer Kit not Installed) Turn on Power Source Closes 524-525 Closes 31-7A circuit 115V AC input power is applied to SCR control circuit and Motor Armature (539-541 circuit) is energized Energizes 1 CR Press Gun Trigger Clos...
Page 52 - TROUBLESHOOTING & REPAIR
LN-7 & LN-7 GMA E-1 TROUBLESHOOTING & REPAIR E-1 If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact yourLocal Lincoln Authorized Field Service Facility for technical troubleshooting assistance before you proceed. CAUTION Thi...
Page 53 - PROBLEMS
E-2 TROUBLESHOOTING & REPAIR E-2 LN-7 & LN-7 GMA Observe all Safety Guidelines detailed throughout this manual If for any reason you do not understand the test procedures or are unable to perform the tests/repairs safely, contact your Local AuthorizedField Service Facility. CAUTION PROBLEMS ...
Page 55 - WIRING DIAGRAM
F-1 WIRING DIAGRAM F-1 LN-7 & LN-7 GMA 1 3 2 4 6 5 567 21 508 50 9 526 525 567 21 OPTIONAL AN ALOG METER KIT P LUG OP T IONAL DIGITAL METER KIT PLUG P5 J5 D C F B A E . CR2 526 527 21 GLP REED SWITCH N.E. GND 2 4 INPUT CONTR OL CAB LE TO CON TACTOR CIRCUIT 115 V.A.C. WORK 4 2 1 6 } * 31 32A 531 ...
Page 56 - NOTES