Assessments - 3, GPA: 3.7
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Ref. 804 688-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. Be sure that Voltage range switch is set to range 1, 2, 3, 4, 5, 6, or 7 to feed wire. Rotate knob until it “clicks” into detent. Wire will not feed if range switch is set between ranges. 6 in (150 mm) Tighten Use pressure indicator scale to set a desired drive roll pressure. Pressure Indicator Scale Tighten 1 2 3 4 Be sure that wire is positioned in proper feed roll groove. Close and tighten pressure assembly, and let go of wire. Be sure that tip matches wire diameter. Reinstall contact tip and nozzle. 6 1 3 4 2 5 4 in (120 mm) 1 2 3 4 SECTION 6 . OPERATION 6-1. Controls 1 Wire Speed Control Use control to select a wire feed speed. As Voltage switch setting increases, wire speed range also increases (see weld setting label in welding power source or Section 6-2, as applicable). 2 Power Switch 3 Voltage Switch The higher the selected number, the thicker the material that can be welded (see weld setting label in welding power source or Section 6-2, as applicable). Do not switch under load. Switch must “click” into detent position. 4 Over Temperature Light Light illuminates if main transformer overheats. 5 Gun Trigger Receptacle Ref. 227 950-A 1 2 3 5 4 OM-227 978 Page 19 OM-227 978 Page 20 6-2. Weld Parameter Chart For 230 VAC Model 227 949-A OM-227 978 Page 21 OM-227 978 Page 22 SECTION 7 . MAINTENANCE &TROUBLESHOOTING 7-1. Routine Maintenance Disconnect power before maintaining. Maintain more often during severe conditions. = Check = Change = Clean = Replace * To be done by Factory Authorized Service Agent Reference Every Unreadable Labels Weld Terminals Damaged Gas Hose Weld Cables 3 Months Cords Gun Cables Every 6 Months OR Drive Rolls Inside Unit 7-2. Overload Protection 802 441 1 Supplementary Protector CB1 CB1 protects unit from overload. If CB1 opens, unit shuts down. Reset supplementary protector. 1 7-3. 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-227 978 Page 23 7-4. Changing Drive Roll Or Wire Inlet Guide 1 Inlet Wire Guide Securing Screw 2 Inlet Wire Guide Loosen screw. Slide tip as close to drive rolls as possible without touching. Tighten screw. 3 Retaining Pin To remove drive roll, push drive roll in and rotate it (1/4 turn) to the open slot and slide it out over the retaining pin. To secure drive roll, locate open slot and push drive roll completely over retaining pin, then rotate drive roll (1/4 turn) to closed slot. 4 Drive Roll The drive roll consists of two different sized grooves. The stamped markings on the end surface of the drive roll refers to the groove on the opposite side of the drive roll. The groove closest to the motor shaft is the proper groove to thread (see Section 5-11). Tools Needed: Ref. 803 714-A .030/.035 Groove .023/.025 Groove Stamped .024 Stamped .030/.035 3 1 2 4 7-5. Replacing Gun Contact Tip Ref. 802 399-A Turn Off power before replacing contact tip. 1 Nozzle 2 Contact Tip Cut off welding wire at contact tip. Remove nozzle. Remove contact tip and install new contact tip. Reinstall nozzle. Tools Needed: 1 2 OM-227 978 Page 24 7-6. Cleaning Or Replacing Gun Liner Ref. 804 692-A 8 mm / 10mm Disconnect gun from unit. Tools Needed: To Reassemble Gun: Insert new liner. Install wire outlet guide so that 1/8 in (3 mm) of liner sticks out. Hand tighten outlet guide, and then tighten two full turns more. Cut liner off so that 3/4 in (19 mm) sticks out of head tube. Install gas diffuser, adapter, contact tip, and nozzle. Head Tube 8 mm Remove liner. Remove nozzle, contact tip, adapter, and gas diffuser. Blow out gun casing. 10 mm Lay gun cable out straight before installing new liner. OM-227 978 Page 25 7-7. Replacing Switch And/Or Head Tube Ref. ST-800 795-C Tools Needed: 19 mm Remove handle locking nut. Slide handle. Secure head tube in vice. Loosen jam nut. Remove from vice and turn head tube out by hand. Hand-tighten head tube into cable connector. Place head tube in vice and tighten until nuts are tight. Remove from vice. Reposition handle and install switch housing. Secure with handle locking nut. Turn Off welding power source /wire feeder and disconnect gun. Remove switch housing. Install new switch and connect leads (polarity is not important). Reassemble in reverse order. If replacing head tube, continue to end of figure. 1 3 2 4 5 8 6 7 7-8. Troubleshooting Table Trouble Remedy No weld output; wire does not feed; fan does not rundoes not run. Secure power cord plug in receptacle (see Section 5-6). Replace building line fuse or reset circuit breaker if open. Place Power switch in On position (see Section 6-1). Reset welding power source supplementary protector (see Section 7-2). No ...