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Manafacture: Hobart File size: 1.2 mb File name: 18831c2d-7135-4035-8622-06b19fc012ee.pdf Language of manual:

OM-923 Page 14 OM-923 Page 15 4-7. Threading Welding Wire 1 Wire Spool 2 Welding Wire 3 Inlet Wire Guide 4 Pressure Adjustment Knob 5 Drive Roll 6 Gun Cable Lay gun cable out straight. Tools Needed: Pull and hold wire; cut off end. 4 in (102 mm) Remove gun nozzle and contact tip. Open pressure assembly. Push wire thru guides into gun liner; continue to hold wire. Hold wire tightly to keep it from unraveling. 804 123-A WOOD Feed wire to check drive roll pressure. Tighten knob enough to prevent slipping. Cut off wire. Close door. Press gun trigger until wire comes out of gun. Turn power on. INPUT POWER 6 in (150 mm) Tighten Loosen knob completely, then rotate pressure adjustment knob in a clockwise direction until drive roll is tight against the welding wire. Adjust drive roll pressure just tightly enough to prevent wire from slipping against drive roll during operation. Tighten Be sure that wire is positioned in proper feed roll groove. Close and tighten pressure assembly, and let go of wire. Be sure that contact tip matches wire diameter. Reinstall tip adapter, if applicable, contact tip and nozzle. Tip adapter may also require removal to allow wire to feed out end of gun. + . + . 6 1 2 3 5 4 + . SECTION 5 . OPERATION 5-1. Controls 1 Material Thickness Selector Switch Use switch to select the material thickness range. Do not switch under load. Switch must “click” into detent position for weld output. 2 Power Switch Ref. 230 001-A 1 2 OM-923 Page 16 5-2. Operating The Gun Ref. 804 240-A 1 Trigger Switch When pressed, energized wire feeds. 1 OM-923 Page 17 SECTION 6 . MAINTENANCE &TROUBLESHOOTING 6-1. Routine Maintenance Disconnect power before maintaining. 3 Months Replace unreadable labels. Repair or replace cracked weld cable. Clean and tighten weld terminals. 6 Months Blow out or vacuum inside. During heavy service, clean monthly. Or 6-2. Overload Protection 804 127-A 1 SupplementaryProtector CB1 CB1 protects unit from overload. If CB1 opens, unit shuts down. Reset supplementary protector. 1 6-3. Drive Motor Protection Drive motor protection circuit protects drive motor from overload. If drive motor becomes inoperative, release gun trigger and wait until protection circuit resets allowing drive motor to feed wire again. OM-923 Page 18 OM-923 Page 19 6-4. Changing Drive Roll Or Wire Inlet Guide 1 Pressure Adjustment Knob 2 Pressure Assembly Pivot pressure adjustment knob down, and lift pressure assembly up. 3 Pivot Tube Plate 4 Securing Screws 5 Pressure Arm Pivot Tube 6 Inlet Wire Guide Remove screws and pivot tube plate. Lift out pressure arm pivot tube, and slide inlet wire guide out of tube. Slide replacement wire guide into tube, and place tube back into drive assembly. Be sure tip of wire guide is as close to drive roll as possible without touching. Reinstall plate and tighten screws. 7 Retaining Knob Rotate counterclockwise and remove knob. 8 Drive Roll The drive roll consists of two different sized grooves. Each side is stamped with the proper size. Select the groove that matches the wire size on the wire spool. Install drive roll onto motor shaft so that correct groove size stamp faces out away from drive housing. 9 Retaining Knob Opening Install retaining knob by placing opening over drive roll (opening faces rear of unit). Rotate retaining knob clockwise to secure drive roll. Position wire into outer groove of drive roll (see Section 4-7). Tools Needed: 804 123-A / 804 129-A .030/.035 .024 Groove VK Groove Stamped .024 Stamped .030/.035 3 4 6 5 5/16 in 8 9 + . 1 2 + . 7 + . 6-5. Replacing Gun Contact Tip Tools Needed: Ref. 804 241-A Turn off welding power source. 1 Nozzle Remove nozzle. 2 Contact Tip 3 Tip Adapter Cut off welding wire at contact tip. Remove contact tip from tip adapter, and install new contact tip. Reinstall nozzle. 1 2 3 OM-923 Page 20 OM-923 Page 21 6-6. Cleaning Gun Liner 804 241-A / Ref. 804 123-A / 804 128-A / Ref. 803 837-A Turn off welding power source. 1 Nozzle 2 Contact Tip 3 Adapter Head Tube Tools Needed: 8 mm Lay gun cable out straight, and blow out liner. Remove nozzle. Cut off wire at contact tip, and remove contact tip and tip adapter. Thread wire according to Section 4-7. Reassemble drive cover and gun in reverse order from taking it apart. Open pressure assembly. Retract wire from liner onto spool. Hold wire tightly to keep it from unraveling. Secure end of wire at spool. Remove screws (3) from cover, and remove cover from wire drive assembly. 8 mm 1 2 3 + . + . + . OM-923 Page 22 6-7. Replacing Gun Liner Ref. 804 241-A / 804 123-A / 803 837-A / 803 899-A Tools Needed: 8 mm / 10 mm Remove nozzle. Cut off wire at contact tip, and remove contact tip and tip adapter. Open pressure assembly. Retract wire from liner onto spool. Hold wire tightly to keep it from unraveling. Secure end of wire at spool. Twist top and bottom handle locking rings counterclockwise 1/4 turn. Slide bottom ring down cable and top ring forward over head tube. Separate gun handle halves...

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