Lincoln LN-742H manual Changing Drive Rolls for FOUR- Roll Wire Feeders

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B-5

OPERATION

B-5

 

 

 

3.Remove the hex head screw and clamping collar. Remove the drive roll from the shaft.

4.The new roll to be installed is stamped for the size wire to be fed. An “A” after the size indicates aluminum wire. Remove the rolls from the kit and wipe them clean. Wipe the output shaft and locating shoulder clean.

5.Use the clamping collar and hex head screw to install the roll on the output shaft. Certain size drive rolls consist of two roll halves, and may contain a spacer. If the drive roll you are installing contains a spacer, the spacer fits between the two halves of the drive roll. Tighten the hex head screw.

6.Back out the guide tube clamping screws. Remove the old guide tubes, if installed.

7.Insert the longer guide tube into the rear hole and the other guide tube through the front hole. The fine wire chisel point end of the guide tube must have the larger radius end next to the drive roll. See Figure B.2. Push the guide tube back as far as it will go and tighten the clamping screw. Insert the incoming guide tube as far back as it will go and tighten the clamping screw. The clamping screws are dog points. When the guide tubes are properly installed these dog points will lock into the annular grooves in each of the guide tubes.

8.Set the idle roll pressure as detailed in the Idle Roll Pressure Setting procedure detailed later in this section.

CHANGING DRIVE ROLLS FOR FOUR- ROLL WIRE FEEDERS:

To change drive rolls on a four-roll wire feeder, refer to Figure B.3 and perform the following steps:

1.Turn off welding power source.

2.Remove the gun and cable from the conductor block on the feeder by loosening the hand screw and pulling the gun straight out of the block.

3.Open both quick release levers by moving the levers outward and pulling them toward you.

4.Loosen the thumb screws holding the guide tubes in place. Remove the incoming and outgoing guide tubes, if installed.

5.Remove the hex head screws and clamping collars from the output shafts. Remove the drive rolls and middle guide tube.

6.The new rolls to be installed are stenciled with the wire size that will be fed. An “A” after the number indicates aluminum wire. Remove the rolls from the kit and wipe them clean. Wipe the output shafts and locating shoulders clean.

7.Install one roll onto the output shaft closest to the incoming side of the feeder clamping collar and hex head screw. Certain size drive rolls consist of two roll halves, and may contain a spacer. If the drive roll you are installing contains a spacer, the spacer fits between the two halves of the drive roll. Tighten the hex head screw.

8.Install the middle guide tube, but do not tighten at this time. When installing a 0.035” middle guide tube the larger radius should be aligned towards the drive roll. Slide the guide tube up against the installed drive roll.

9.Install the second drive roll on the remaining shaft the same way as the first. Center the middle guide tube between the rolls and tighten the thumbscrews holding it in place.

10.Close and latch both quick release levers.

11.Slide the longer guide tube into the rear hole of the gearbox until it almost touches the drive roll and guide tube. Tighten the thumbscrew to hold it in place.

12.Install the outgoing guide tube into the front hole of the gearbox (through the conductor block) and tighten the thumb screw. The 0.035 in. outgoing guide tube should have the larger radius oriented toward the drive roll. For proper installation of the outgoing guide tube insert, refer to Figure B.3.

13.Be certain that the guide tubes do not touch the drive rolls or idle rolls. If they do touch, readjust them and tighten in place.

LN-742 & LN-742H

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Contents LN-742 & LN-742H Wire Feeders California Proposition 65 Warnings SafetyElectric Shock can kill Cylinder may explode if damaged Sûreté Pour Soudage a L’Arc Précautions DE SûretéThank You Table of Contents Technical Specifications LN-742 InstallationInput Cable Connections Mounting LocationFigure A.2 Strain Relief Clamp PIN GUN Cable Connections Table A.1 Work Lead SpecificationsWork Cable GUN and Cable AssembliesFigure A.5 Water Connections Water Connections For Water Cooled GunsFigure A.6 Shielding GAS Hookup Gmaw Shielding GAS HookupGeneral Description Safety PrecautionsOperation Operating InstructionsFigure B.1 Wire Feeder Controls Controls and SettingsEnglish or Metric Speed Display Units Acceleration SettingDrive Roll Installation Changing Drive Rolls for TWO- Roll Wire FeedersGuide Tube Detail Changing Drive Rolls for FOUR- Roll Wire Feeders Figure B.3 Installing Drive Rolls on a FOUR-ROLL Feeder Figure B.4 Idle Roll Pressure Setting Idle Roll Pressure SettingFigure B.5a Threaded Locking Collar Wire LoadingInnershield Coils Electrode Feeding and Brake AdjustmentTo Mount a 50 or 60 LB Coil Adjustable Wire Reel BrakeFigure B.7 K1504-1 Coil Reel READI-REELS a K438 READI-REEL Adapter Must be UsedMaking a Weld Wire Reel ChangingTable C.1 LN-742 Accessories AccessoriesGeneral Solenoid KIT K589-1 Remote Control KITK163 Undercarriage K178-1 Mounting PlatformWelding Guns Power Input CablesSPINDLES, STANDS, Adapters Attaching the Wire Reel Stand Table C.2 Drive Roll KIT Numbers Drive Roll KitsRoutine Maintenance MaintenancePeriodic Maintenance HOW to USE Troubleshooting Guide TroubleshootingTroubleshooting Troubleshooting Troubleshooting Troubleshooting Troubleshooting Troubleshooting Diagrams LN-742 & LN-742H LN-742 & LN-742H LN-742 & LN-742H LN-742 & LN-742H Precaucion Warnung

LN-742, LN-742H specifications

The Lincoln LN-742H and LN-742 are renowned models in the realm of industrial welding equipment, specifically designed to cater to the needs of professional welders and fabricators. These machines stand out for their robustness, advanced technology, and ease of use, making them popular choices in various industries, including construction, automotive, and manufacturing.

One of the main features of the Lincoln LN-742H and LN-742 is their powerful Arc control capabilities. The machines are equipped with innovative technology that allows for consistent arc stability, which is crucial for achieving high-quality welds. The adjustable arc force enables users to tailor the welding parameters to their specific applications, facilitating optimal penetration and minimal spatter.

The LN-742H model is particularly notable for its enhanced portable design, making it easier for operators to transport the machine to different job sites. This portability does not compromise its power, as it offers a high output suitable for both thin and thicker materials. Moreover, the LN-742 model comes with a highly efficient cooling system that ensures the machine runs smoothly without overheating, even during prolonged use.

Both models feature an intuitive user interface that simplifies the welding process. The digital display offers real-time feedback on the welding parameters, allowing welders to make precise adjustments as needed. This feature is especially beneficial for beginners, who may be unfamiliar with optimal welding settings.

Another impressive characteristic of the Lincoln LN-742H and LN-742 machines is their versatility. They support various welding processes, including MIG, TIG, and stick welding, giving users the flexibility to choose the most suitable method for their projects. This adaptability makes these models an ideal solution for shops that handle a wide range of welding tasks.

Durability is a significant consideration in the design of the LN-742H and LN-742, as they are built with high-quality materials that withstand heavy use and challenging conditions. The rugged construction extends the lifespan of the machines, reducing the need for frequent repairs and servicing.

In summary, the Lincoln LN-742H and LN-742 welding machines exemplify advanced engineering and user-focused design. Their combination of powerful performance, portability, user-friendly features, and versatile applications makes them essential tools for professionals in the welding industry, paving the way for excellence in metal fabrication and repair.
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