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 3 - ii
ii SAFETY ii ARC RAYS can burn. 4.a. Use a shield with the proper filter and cover plates to protect your eyes from sparks andthe rays of the arc when welding or observingopen arc welding. Headshield and filter lensshould conform to ANSI Z87. I standards. 4.b. Use suitable clothing made from durable...
Page 4 - iii
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 - iv; PRÉCAUTIONS DE SÛRETÉ
iv SAFETY iv Mar. ‘93 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 contr...
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 - TABLE OF CONTENTS; Page
vi vi TABLE OF CONTENTS LN-742 & LN-742H Page Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i-iv Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section A Tec...
Page 8 - INSTALLATION; PHYSICAL DIMENSIONS
A-1 INSTALLATION A-1 PHYSICAL DIMENSIONS ENVIRONMENTAL RATING (ALL MODELS) BOTH LN-742 AND LN-742H LENGTH TOTAL WEIGHT LESS ELECTRODE 24 lbs (11.0 kg) WIDTH HEIGHT 2 ROLL FEEDERWITH WIRE STAND (K377) 2 ROLL FEEDERWITHOUT WIRE STAND 4 ROLL FEEDERWITH WIRE STAND (K377) 4 ROLL FEEDERWITHOUT WIRE STAND ...
Page 9 - MOUNTING LOCATION; FIGURE A.1 – INPUT CONTROL CABLE AND
A-2 INSTALLATION LN-742 & LN-742H A-2 MOUNTING LOCATION The LN-742 wire feeders can be mounted directly ontop of the power source providing that it is secure andlevel. The LN-742 can also be mounted to anundercarriage when portability is required. The LN-742should be installed upright on a horiz...
Page 10 - STRAIN RELIEF CLAMP.
A-3 INSTALLATION LN-742 & LN-742H A-3 4. Connect the remaining end of the control cablewith the eight-socket cable plug to the matingreceptacle on the LN-742. 5. Referring to Figure A.2, install the input cableunder the wire reel mounting stand strain reliefclamp. Remove the screws holding the c...
Page 11 - LN-742 WIRE FEEDER TO LINCOLN POWER SOURCE
A-4 INSTALLATION LN-742 & LN-742H A-4 ELECTRIC SHOCK CAN KILL TURN INPUT POWER OFFBEFORE CONNECTING THELN-742 WIRE FEEDER. WARNING CLEVELAND, OHIO U.S.A - + LINCOLN POWER SOURCE LN-742 WIRE FEEDER LN-742 INPUT CABLE ASSEMBLY TO WORK ELECTRODE CABLE 14-SOCKET BOX RECEPTACLE, FRONT VIEWAND 14-PIN ...
Page 12 - WORK CABLE; WORK LEAD SPECIFICATIONS; GUN AND CABLE ASSEMBLIES; GUN CABLE CONNECTIONS; GUN CABLE CONNECTIONS.
A-5 INSTALLATION LN-742 & LN-742H A-5 WORK CABLE Connect a work lead of sufficient size and length(Table A.1) between the proper output stud on thepower source and the work. Be sure the connection tothe work makes tight metal-to-metal electrical contact. TABLE A.1 – WORK LEAD SPECIFICATIONS Copp...
Page 14 - GMAW SHIELDING GAS HOOKUP; Safety In Welding; SHIELDING GAS HOOKUP.
A-7 INSTALLATION LN-742 & LN-742H A-7 GMAW SHIELDING GAS HOOKUP Gas under pressure is explosive.Always keep gas cylinders in anupright position and chained to theundercarriage or a stationarysupport. See American NationalStandard Z-49.1, “ Safety In Welding And Cutting ” , published by the Ameri...
Page 15 - OPERATION; OPERATING INSTRUCTIONS; GENERAL DESCRIPTION
B-1 OPERATION LN-742 & LN-742H B-1 OPERATING INSTRUCTIONS Read and understand the entire Operation Sectionprior to operating the machine. SAFETY PRECAUTIONS ELECTRIC SHOCKcan kill. • Do not touch electrically live partsor electrode with skin or wetclothing. • Insulate yourself from work orground...
Page 16 - CONTROLS AND SETTINGS; WIRE FEEDER CONTROLS.
B-2 OPERATION B-2 • 0.045 to 5/64 in. (1.2 to 2.0 mm) cored wire for Innershield processes. The LN-742H is capable of the following wire feedranges: • 0.025 to 0.045 in. (0.6 to 1.2 mm) solid wire for gas-metal-arc or CV submerged arc processes. • 0.035 to 0.045 in. (1.2 mm) cored wire forOutershiel...
Page 17 - ACCELERATION SETTING; CIRCUIT PROTECTION
B-3 OPERATION B-3 FUNCTION SELECTION CONTROLS. This controlenables the operator to select the function that will bedisplayed as shown by the indicator lights. Pressingthe key causes the mode lights to sequence (from topto bottom). Settings displayed in the LED display areadjusted using the setting a...
Page 18 - GUIDE TUBE DETAIL; INSTALLING DRIVE ROLLS ON A TWO-ROLL FEEDER.
B-4 OPERATION B-4 LN-742 & LN-742H GUIDE TUBE DETAIL OUTGOING GUIDE TUBE INSERT OUTGOING GUIDE TUBE LARGE RADIUS DRIVE ROLL INCOMING GUIDE TUBE SMALL RADIUS IDLE ROLL CLAMPING COLLAR SPACER (IF REQUIRED) OUTPUT SHAFT DRIVE ROLL HALVES FIGURE B.2 – INSTALLING DRIVE ROLLS ON A TWO-ROLL FEEDER.
Page 20 - INSTALLING DRIVE ROLLS ON A FOUR-ROLL FEEDER.
B-6 OPERATION B-6 LN-742 & LN-742H FIGURE B.3 – INSTALLING DRIVE ROLLS ON A FOUR-ROLL FEEDER. GUIDE TUBE DETAIL OUTGOING GUIDE TUBE INSERT OUTGOING GUIDE TUBE MIDDLE GUIDE TUBE SMALL RADIUS IDLE ROLL LARGE RADIUS CLAMPING COLLAR OUTPUT SHAFT SPACER (IF REQUIRED) DRIVE ROLL HALVES
Page 21 - IDLE ROLL PRESSURE SETTING; 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 22 - WIRE LOADING
B-8 OPERATION B-8 WIRE LOADING Loading a 22 to 30 Lb. (10 to 14 kg) Readi-ReelP a c k a g e U s i n g t h e M o l d e d P l a s t i c K 3 6 3 - PReadi-Reel Adapter: The Spindle should be located in the LOWER mounting holeof the K1524-1 Universal Stand if used. 1) Depress the Release Bar on the Retai...
Page 24 - WIRE REEL LOADING; CAUTION
B-10 OPERATION B-10 WIRE REEL LOADING – 50 AND 60 LB COILS (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 wi...
Page 26 - MAKING A WELD
B-12 OPERATION B-12 MAKING A WELD 1. Use only constant voltage power type sources. If using a multiple process power source, be sure itis set for constant voltage output per instructionsin the manual for the power source. 2. Set the power source polarity switch or properly connect the electrodes and...
Page 27 - ACCESSORIES; GENERAL; Product Number
C-1 ACCESSORIES C-1 GENERAL The following is a list of the accessories that can beused with the LN-742 wire feeder. A detailed description of each item is given later in thissection. LN-742 & LN-742H Product Number Name K163 Undercarriage K178-1 Mounting Platform K589-1 Remote Control Kit K590-1...
Page 28 - FLUX SYSTEM COMPONENTS; K58 MAGNETIC SEPARATOR
C-2 ACCESSORIES C-2 K163 UNDERCARRIAGE The undercarriage includes casters, wheels, a handle,and related hardware. Casters are mounted at the frontand wheels at the rear of the platform. The handle isbolted to the front of the platform so the wire feedercan be tilted back and wheeled like a two-wheel...
Page 29 - POWER INPUT CABLES; WELDING GUNS; INNERSHIELD GUNS
C-3 ACCESSORIES C-3 K320 FLUX TANK 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 the cap from the tank. Using th...
Page 30 - SUBMERGED ARC GUNS
C-4 ACCESSORIES C-4 SUBMERGED ARC GUNS The K112 gun and cable assembly is recommendedfor welding with 1/16 in. solid steel electrode at up to500 amps. Gun cable length is 15 feet. GMAW GUNS An expanding line of Magnum GMA gun and cableassemblies are available to allow welding with solidand cored ele...
Page 32 - DRIVE ROLL KITS; DRIVE ROLL KIT NUMBERS.
C-6 ACCESSORIES C-6 DRIVE ROLL KITS Table C-2 lists the appropriate drive roll kits for eachtype of wire used. LN-742 & LN-742H 2-Roll 4-Roll Steel Wire Sizes0.068-3/32 in. (1.7-2.4 mm) Cored KP653-3/32C KP655-3/32C 1/16 in. (1.6 mm) Cored or Solid KP653-1/16 KP655-1/16 0.045-0.052 in. (1.2-1.3 ...
Page 33 - MAINTENANCE; ROUTINE MAINTENANCE; DRIVE ROLLS AND GUIDE TUBES; WIRE REEL MOUNTING; PERIODIC MAINTENANCE; WIRE DRIVE MOTOR AND GEARBOX
D-1 MAINTENANCE D-1 LN-742 & LN-742H ROUTINE MAINTENANCE DRIVE ROLLS AND GUIDE TUBES After feeding every coil of wire, inspect the drive rollsection. Clean the assembly as necessary. Do not usesolvent to clean the drive roll assembly as it may washthe lubricant out of the bearings. The drive rol...
Page 34 - TROUBLESHOOTING; ELECTRIC SHOCK can kill.; HOW TO USE TROUBLESHOOTING GUIDE
E-1 TROUBLESHOOTING E-1 LN-742 & LN-742H 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 WARNING ELECTRI...
Page 35 - PROBLEMS
E-2 TROUBLESHOOTING E-2 LN-742 & LN-742H 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 yourLocal Lincoln Authorized Field Service Facility for technical troubles...
Page 41 - DIAGRAMS
F-1 DIAGRAMS F-1 LN-742 & LN-742H NOTE: This diagram is for reference only. It may not be accurate for all machines covered by this manual. The specific diag ram for a particular code is pasted inside the machine on one of the enclosure panels. If the diagram is illegible, write to the Service D...
Page 42 - NOTES
Page 46 - ÇÃ
WARNING AVISO DE PRECAUCION ATTENTION WARNUNG ATEN ÇÃ O Spanish French German Portuguese Japanese Chinese Korean Arabic READ AND UNDERSTAND THE MANUFACTURER’S INSTRUCTION FOR THIS EQUIPMENT AND THE CONSUMABLES TO BEUSED AND FOLLOW YOUR EMPLOYER’S SAFETY PRACTICES. SE RECOMIENDA LEER Y ENTENDER LAS I...
