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Instructions Lincoln, Modèle LN-742 LN-742H

Fabricant : Lincoln
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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 B-6 B-6 OPERATION FIGURE B.3 – INSTALLING DRIVE ROLLS ON A FOUR-ROLL FEEDER. CLAMPING GUIDE TUBE DETAIL OUTGOING GUIDE TUBE INSERT OUTGOING GUIDE TUBE MIDDLE GUIDE TUBESMALL RADIUS IDLE ROLL LARGE RADIUS COLLAR OUTPUT SHAFT SPACER (IF REQUIRED) DRIVE ROLL HALVES LN-742 & LN-742H B-7 B-7 OPERATION IDLE ROLL PRESSURE SETTING The idle roll pressure is set at the factory. Two-roll feeders are set with the pressure adjustment knob backed out two turns from full pressure, and four-roll feeders are set backed out three turns. This is an approximate setting. For small wire sizes and aluminum wire the optimum idle roll pressure varies with type of wire, surface condition, lubrication, and hardness. The optimum idle roll setting can be determined as follows: Two-roll wire feeders: 1. Press the end of the gun against a solid object that is electrically isolated from the welder output and press the trigger for several seconds. 2. If the wire “birdnests”, jams, or breaks at the drive roll, the idle roll pressure is set too high. Back the pressure adjustment knob, Figure B.4, out 1/2 turn. Run new wire through the gun and repeat step 1. 3. If the only result is drive roll slippage, loosen the gun cable clamping screw on the conductor block and pull the gun cable forward about six inches. There should be a slight waviness in the exposed wire. If there is no waviness, the pressure is too low. Increase the pressure setting 1/4 turn. Lock the gun cable in place and repeat steps 1 and 2. Four-roll wire feeders: 1. Release the incoming idle roll and perform the pressure setting procedure for two roll feeders to set outgoing idle roll pressure. 2. After outgoing pressure is set, determine how many turns away from full pressure the setting is. 3. Set both idle roll tensions to this setting. Engage both idle rolls before welding. For most applications, best wire feeding will occur when both idle roll pressures are set the same. FIGURE B.4 – IDLE ROLL PRESSURE SETTING. PRESSURE ADJUSTMENTKNOB LN-742 & LN-742H B-8 OPERATION B-8 WIRE LOADING Loading a 22 to 30 Lb. (10 to 14 kg) Readi-Reel Package Using the Molded Plastic K363-P Readi-Reel Adapter: The Spindle should be located in the LOWER mounting hole of the K1524-1 Universal Stand if used. 1) Depress the Release Bar on the Retaining Collar and remove it from the spindle. NOTE: Earlier spindles used a threaded collar. See Figure B.5a or B.5b. 2) Place the Adapter on the spindle. 3) Re-install the Retaining Collar. Make sure that the Release Bar “pops up” and that the collar retainers fully engage the retaining groove on the spindle. 4) Rotate the spindle and adapter so the retaining spring is at the 12 o'clock position. 5) Position the Readi-Reel so that it will rotate in a direction when feeding so as to be de-reeled from the bottom of the coil. 6) Set one of the Readi-Reel inside cage wires on the slot in the retaining spring tab. 7) Lower the Readi-Reel to depress the retaining spring and align the other inside cage wires with the grooves in the molded adapter. 8) Slide the cage all the way onto the adapter until the retaining spring "pops up" fully. Check to be sure the Retaining Spring has fully returned to the locking position and has SECURELY locked the Readi-Reel Cage in place. Retaining Spring must rest on the cage, not the welding electrode. ___________________________________________ 9) To remove Readi-Reel from Adapter, depress retaining spring tab with thumb while pulling the Readi-Reel cage from the molded adapter with both hands. Do not remove adapter from spindle. LN-742 & LN-742H WARNING 2 IN. O.D. SPINDLE ADAPTER RETAINING SPRING BRAKE HOLDING PIN GROOVES READI-REEL INSIDE CAGE WIRES THREADED LOCKING COLLAR FIGURE B.5a (Threaded Locking Collar) FIGURE B.5b (Retaining Collar) B-9 B-9 OPERATION TO MOUNT 10 TO 44 lb (4.5 to 20 kg) SPOOLS (12 in./300 mm DIAMETER) OR 13-14 lb (6 kg) INNERSHIELD COILS: The spindle should be located in the lower mounting hole of the K1524-1 Universal Stand if used. [For 8 in. (200 mm) spools, a K468 spindle adapter must first be slipped onto the sp...