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Manafacture: Lincoln File size: 653.87 kb File name: dc28a790-ad2a-4744-ad71-ffc78974db69.pdf Language of manual:

. . . . . . . . . . . . . . . . B-8 Making a Weld . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12 Wire Reel Changing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section C General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1 Flux System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2 Power Input Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3 Welding Guns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3 Spindles, Stands, and Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4 Attaching the Wire Reel Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5 Drive Roll Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section D Routine Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1 Periodic Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1 Troubleshooting and Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section E How To Use Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-2 Electrical Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Section F Parts Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-228 LN-742 & LN-742H A-1 A-1 INSTALLATION TECHNICAL SPECIFICATIONS – LN-742 INPUT VOLTAGE 40 to 42V ±10%, 50/60 Hz, 4.0 Amps WIRE FEED SPEED SYSTEM WIRE SPEED RANGE LN-742 50 in. to 770 in. per minute (1.25 to 19.5 m/min) LN-742H 80 in. to 1200 in. per minute (2.00 to 30.5 m/min) WIRE DIAMETERS SYSTEM ELECTRODE DIAMETER LN-742 SOLID 0.025 in. through 1/16 in. (0.6 through 1.6 mm) LN-742H SOLID 0.025 in. through 0.045 in. (0.6 through 1.2 mm) LN-742 CORED 0.045 in. through 3/32 in. (1.2 through 2.4 mm) LN-742H CORED 0.035 in. (0.9 mm) TEMPERATURE RATING (ALL MODELS) OPERATING -4°F to 104°F (-20°C to +40°C) STORAGE -40°F to 104°F (-40°C to +40°C) PHYSICAL DIMENSIONS BOTH LN-742 AND LN-742H LENGTH WIDTH HEIGHT TOTAL WEIGHT LESS ELECTRODE 2 ROLL FEEDER WITHOUT WIRE STAND 9.62 in. (244 mm) 9.76 in. (247 mm) 10.89 in. (277 mm) 24 lbs (11.0 kg) 2 ROLL FEEDER WITH WIRE STAND (K377) 20.68 in. (525 mm) 9.76 in. (247 mm) 17.00 in. (432 mm) 34 lbs (15.5 kg) 4 ROLL FEEDER WITHOUT WIRE STAND 10.60 in. (269 mm) 11.60 in. (295 mm) 11.11 in. (282 mm) 28.7 lbs (13.1 kg) 4 ROLL FEEDER WITH WIRE STAND (K377) 21.66 in. (550 mm) 11.60 in. (295 mm) 17.00 in. (432 mm) 38.7 lbs (17.7 kg) ENVIRONMENTAL RATING (ALL MODELS) IP21 (IEC 529) LN-742 & LN-742H A-2 A-2 INSTALLATION MOUNTING LOCATION The LN-742 wire feeders can be mounted directly on top of the power source providing that it is secure and level. The LN-742 can also be mounted to an undercarriage when portability is required. The LN-742 should be installed upright on a horizontal surface. A K178-1 mounting platform is available for mounting the LN-742 to the top of Idealarc power sources. Refer to Section C, Accessories, for details. INPUT CABLE CONNECTIONS Refer to Section C, Accessories, for descriptions of the various input cable assemblies available for the LN-742 wire feeder. WARNING Turn input power off before connecting the LN-742 wire feeder. For connecting an LN-742 to a specific Lincoln power source, follow steps 1 through 5, and refer to the connection diagram in Figure A.3. The welding cable used must be sized according to the current and the duty cycle of the application. With input power disconnected at the source, install the input cable per connection diagram A.3, and complete the following instructions: 1. Connect the end of the control cable with the 14pin cable plug to the mating receptacle on the power source. 2. Connect the electrode lead to the power source output terminal of the desired polarity. 3. Referring to Figure A.1, route the other end of the electrode cable through the large oval hole in the rear panel of the LN-742 case. Connect the electrode to the copper strap on the side of the gearbox using the stud and nut provided. FIGURE A.1 – INPUT CONTROL CABLE AND ELECTRODE CABLE CONNECTIONS. NUT STUD ELECTRODE CONTROL CABLE COPPER STRAP LN-742 & LN-742H A-3 A-3 INSTALLATION 4. Connect the remaining end of the control cable with the eight-socket cable plug to the mating receptacle on the LN-742. 5. Referring to...

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