Miller Bobcat 250 Diesel Owner's Manual
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Miller Bobcat 250 Diesel Owner's Manual

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Bobcat 250 Diesel
OM-258413H
2019−02
Processes
Stick (SMAW) Welding
MIG (GMAW) Welding
Flux Cored (FCAW) Welding
Non-Critical TIG (GTAW)
Welding
Description
Engine Driven Welder/Generator
File: Engine Drive

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  • Page 1 OM-258413H 2019−02 Processes Stick (SMAW) Welding MIG (GMAW) Welding Flux Cored (FCAW) Welding Non-Critical TIG (GTAW) Welding Description Engine Driven Welder/Generator ™ Bobcat 250 Diesel File: Engine Drive For product information, Owner’s Manual translations, and more, visit www.MillerWelds.com...
  • Page 2 We know you don’t have time to do it any other way. That’s why when Niels Miller first started building arc welders in 1929, he made sure his products offered long-lasting value and superior quality.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS SECTION 1 − SAFETY PRECAUTIONS − READ BEFORE USING ....... . . 1-1.
  • Page 4 TABLE OF CONTENTS SECTION 6 − OPERATING THE WELDER/GENERATOR ........6-1.

  • Page 5: Section 1 − Safety Precautions − Read Before Using

    SECTION 1 − SAFETY PRECAUTIONS − READ BEFORE USING rom_2018−06 Protect yourself and others from injury — read, follow, and save these important safety precautions and operating instructions. 1-1. Symbol Usage DANGER! − Indicates a hazardous situation which, if Indicates special instructions. not avoided, will result in death or serious injury.
  • Page 6 D Watch for fire, and keep a fire extinguisher nearby. FLYING METAL or DIRT can injure D Be aware that welding on a ceiling, floor, bulkhead, or partition can eyes. cause fire on the hidden side. D Do not cut or weld on tire rims or wheels. Tires can explode if heat- D Welding, chipping, wire brushing, and grinding ed.

  • Page 7: Engine Hazards

    1-3. Engine Hazards EXHAUST SPARKS can cause fire. BATTERY EXPLOSION can injure. D Do not let engine exhaust sparks cause fire. D Always wear a face shield, rubber gloves, and D Use approved engine exhaust spark arrestor in protective clothing when working on a battery. required areas —...

  • Page 8: Additional Symbols For Installation, Operation, And Maintenance

    HOT METAL from air arc cutting and MOVING PARTS can injure. gouging can cause fire or explosion. D Keep away from moving parts such as fans, D Do not cut or gouge near flammables. belts and rotors. D Watch for fire; keep extinguisher nearby. D Keep all doors, panels, covers, and guards closed and securely in place.
  • Page 9 BATTERY CHARGING OUTPUT and BATTERY STATIC (ESD) can damage PC boards. EXPLOSION can injure. D Put on grounded wrist strap BEFORE handling Battery charging not present on all models. boards or parts. D Use proper static-proof bags and boxes to D Always wear a face shield, rubber gloves, and protective clothing when working on a battery.

  • Page 10: California Proposition 65 Warnings

    1-6. California Proposition 65 Warnings For Diesel Engines: WARNING: Breathing diesel engine exhaust exposes you to WARNING: This product can expose you to chemicals in- chemicals known to the state of California to cause cancer cluding lead, which are known to the state of California to and birth defects or other reproductive harm.

  • Page 11: Section 2 − Consignes De Sécurité − Lire Avant Utilisation

    SECTION 2 CONSIGNES DE SÉCURITÉ − LIRE AVANT − UTILISATION rom_2018−06_fre Pour écarter les risques de blessure pour vous−même et pour autrui — lire, appliquer et ranger en lieu sûr ces consignes relatives aux précautions de sécurité et au mode opératoire. 2-1.
  • Page 12 D Fixer le câble de retour de façon à obtenir un bon contact métal- LES ACCUMULATIONS DE GAZ métal avec la pièce à souder ou la table de travail, le plus près pos- risquent de provoquer des blessures sible de la soudure. D Isoler la pince de masse quand pas mis à...

  • Page 13: Dangers Existant En Relation Avec Le Moteur

    D Porter un équipement de protection pour le corps fait d’un matériau Si des BOUTEILLES sont endomma- résistant et ignifuge (cuir, coton robuste, laine). La protection du gées, elles pourront exploser. corps comporte des vêtements sans huile comme par ex. des gants de cuir, une chemise solide, des pantalons sans revers, des chaussures hautes et une casquette.

  • Page 14: Dangers Liés À L'air Comprimé

    D Ne pas approcher les mains, cheveux, vêtements lâches et outils cisé autrement dans la section maintenance du manuel du des organes mobiles. moteur). D Si le moteur est chaud et que le liquide doit être vérifié, opérer com- D Remettre en place les portes, panneaux, recouvrements ou me suivant.

  • Page 15: Dangers Supplémentaires En Relation Avec L'installation, Le Fonctionnement Et La Maintenance

    détendre la pression et s’assurer que le circuit d’air ne peut être L’INHALATION D’AIR COMPRIMÉ risque mis sous pression par inadvertance. de provoquer des blessures ou même D Demander seulement à un personnel qualifié d’enlever la mort. les dispositifs de sécurité ou les recouvrements pour effectuer, s’il y a lieu, des travaux d’entretien et de dépannage.
  • Page 16 D Réduire le courant ou le facteur de marche avant de poursuivre le LA SORTIE DE RECHARGE et L’EXP- soudage. LOSION DE LA BATTERIE peuvent D Ne pas obstruer les passages d’air du poste. provoquer des blessures. LES CHARGES ÉLECTROSTATI- La recharge de batterie n’existe pas sur tous les QUES peuvent endommager les modèles.

  • Page 17: Proposition Californienne 65 Avertissements

    2-6. Proposition californienne 65 Avertissements Pour les moteurs diesel : AVERTISSEMENT : ce produit peut vous exposer à des pro- duits chimiques tels que le plomb, reconnus par l’État de AVERTISSEMENT : les gaz d’échappement de moteurs diesel Californie comme cancérigènes et sources de malformations vous exposent à...

  • Page 18: Section 3 − Definitions

    Complete Parts List is available at www.MillerWelds.com SECTION 3 − DEFINITIONS 3-1. Additional Safety Symbol Definitions Warning! Watch Out! There are possible hazards as shown by the symbols. Safe1 2012−05 Do not use ether or other starting fluids. Using starting fluids voids warranty. See engine Owner’s Manual. Safe89 2017−04 Moving parts can injure.
  • Page 19 Complete Parts List is available at www.MillerWelds.com Engine Oil Glow Plug Temperature Call for Fuel Air Filter Maintenance Check Valve Battery (Engine) Hour Meter Clearance Single Phase Engine Idle (Slow) Alternator Hertz Engine Run (Fast) Engine Coolant Engine Start Belt Drive Temperature (Engine RPM) Engine Stop...
  • Page 20 Complete Parts List is available at www.MillerWelds.com Notes OM-258413 Page 16...

  • Page 21: Section 4 − Specifications

    Complete Parts List is available at www.MillerWelds.com SECTION 4 − SPECIFICATIONS 4-1. Serial Number And Rating Label Location The serial number and rating information for this product is located on the back. Use rating label to determine input power requirements and/or rated output.

  • Page 22: Dimensions, Weights, And Operating Angles

    Complete Parts List is available at www.MillerWelds.com 4-4. Dimensions, Weights, And Operating Angles Do not exceed tilt angles or engine could be damaged or unit could tip. Do not move or operate unit where it could tip. Weight: 638 lb (289 kg) Lifting Eye Weight Rating: 1250 lb (567 kg) Support Assembly Dimensions...

  • Page 23: Duty Cycle And Overheating

    Complete Parts List is available at www.MillerWelds.com 4-5. Duty Cycle And Overheating 100% Duty Cycle Duty cycle is the percentage of 10 minutes that unit can weld at rated load without overheating. This unit is rated at 250 am- peres for continuous welding. NOTICE −...

  • Page 24: Fuel Consumption

    Complete Parts List is available at www.MillerWelds.com 4-7. Fuel Consumption A typical job using 1/8 in 7018 electrodes (125 amps, 20% duty cycle), expect about 24 hours of operation per fuel fill. Welding at 150 amps at 40% duty cycle uses approximately 1/2 gallon per hour, or about 22 hours of operation per fuel fill.

  • Page 25: Section 5 − Installation

    Complete Parts List is available at www.MillerWelds.com SECTION 5 − INSTALLATION 5-1. Installing Welder/Generator Do not move or operate unit where it could tip. Do not lift unit from end. Movement Do not weld on base. Welding on base can cause fuel tank fire or explosion.

  • Page 26: Grounding Generator To Truck Or Trailer Frame

    Complete Parts List is available at www.MillerWelds.com 5-2. Grounding Generator To Truck Or Trailer Frame GND/PE rot_grnd2 2018−01 − 800652-D frame. Always connect a ground Equipment Grounding Terminal (On Always ground generator frame to wire from the generator equipment Front Panel) vehicle frame to prevent electric grounding terminal to bare metal on shock and static electricity hazards.

  • Page 27: Connecting The Battery

    Complete Parts List is available at www.MillerWelds.com 5-4. Connecting The Battery − Tools Needed: 3/8, 1/2 in. 259 707 / Ref. S-0756-D ing the battery cables attach the positive Never disconnect the battery while Connect negative (−) cable last. the engine is running. (+) cable to the positive (+) battery termin- Battery is most easily accessed through al first, followed by negative (−) cable to...

  • Page 28: Engine Prestart Checks And Overview

    Complete Parts List is available at www.MillerWelds.com 5-5. Engine Prestart Checks And Overview Generator Power Receptacles (see Exhaust Pipe 12 Oil Filter Section 7) Engine Maintenance Label 13 Oil Dipstick Weld Output Terminals (see Section 5-7) Radiator Cap 14 Primary Fuel Filter Operator Controls (see Section 6) Water Bypass Hose 15 Inline Fuel Filter...
  • Page 29 Complete Parts List is available at www.MillerWelds.com Engine shown with doors remo- ved. Doors must be in place when Engine Left Side engine is running. Engine must be cold and on a level sur- face. See maintenance label (Section 8-5) for fluid specifications.

  • Page 30: Selecting Cable Sizes

    Complete Parts List is available at www.MillerWelds.com 5-6. Selecting Cable Sizes* NOTICE − The Total Cable Length in Weld Circuit (see table below) is the combined length of both weld cables. For example, if the power source is 100 ft (30 m) from the workpiece, the total cable length in the weld circuit is 200 ft (2 cables x 100 ft). Use the 200 ft (60 m) column to determine cable size.

  • Page 31: Connecting To Weld Output Terminals

    Complete Parts List is available at www.MillerWelds.com 5-8. Connecting To Weld Output Terminals Stop engine. Failure to properly connect weld cables may cause ex- cessive heat and start a fire, or damage your machine. Do not place anything between weld cable terminal and copper bar.

  • Page 32: Section 6 − Operating The Welder/Generator

    Complete Parts List is available at www.MillerWelds.com SECTION 6 − OPERATING THE WELDER/GENERATOR 6-1. Engine Control Switches Glow Plug Time ° ° F (21 0 seconds ° ° F (0 10 seconds ° ° −4 F (−20 20 seconds Do not use glow plugs longer than 20 seconds.

  • Page 33: Weld Output Controls

    Complete Parts List is available at www.MillerWelds.com 6-2. Weld Output Controls Ref. 258 070-A Weld Process Selector Switch Coarse Range Switch Fine Control Use control to select weld amperage (Stick/ NOTICE − Do not switch while welding. Tig) or voltage (Wire) within the range selected NOTICE −...

  • Page 34: Typical Stick Welding Connections And Control Settings

    Work Clamp Electrode Holder Connect Work cable to Work terminal and Electrode holder cable to Elec- trode terminal on welder/generator. Miller recommends Hobart filler metals. Tools Needed: 3/4 in. 259 707 / Ref 258 070-A OM-258413 Page 30...

  • Page 35: Typical Mig Welding Connections And Settings

    Connect work cable to welder/generator Tools Needed: Work terminal. Connect cable from wire feeder to cable from welder/generator 3/4 in. Electrode terminal. Miller recommends Hobart filler met- als. 259 707 / Ref 258 070-A / Ref. 802 766-C OM-258413 Page 31...

  • Page 36: Typical Mig Connections And Settings Using Weld Control And Spoolgun

    Weld Cable (Customer-Supplied) Set Fine Control to desired voltage Work terminal. Weld Control Weld Terminal (arc length). Start with a low voltage Miller recommends Hobart filler metals. setting (about 4) to prevent burnback. Weld Power Cable From Spoolgun OM-258413 Page 32...

  • Page 37: Fuel/Hour Gauge Descriptions

    Complete Parts List is available at www.MillerWelds.com 6-6. Fuel/Hour Gauge Descriptions OM-258413 Page 33...

  • Page 38: Section 7 − Operating Auxiliary Equipment

    2 x (120 V x 20 A) + (240 V x 26 A) = 11.0 position to reset. kVA/kW 120/240 V 50 A AC Receptacle RC1 Supplementary Protector CB2 Miller recommends Hobart filler met- 120 V 20 A AC Receptacles RC2 and RC3 (GFCI Receptacles Shown) Supplementary Protector CB3 als.

  • Page 39: Gfci Receptacle Information, Resetting, And Testing

    Complete Parts List is available at www.MillerWelds.com 7-2. GFCI Receptacle Information, Resetting, And Testing Alternate location for red and green indicator LEDs. Orientation of receptacle may be different in other applications. RotGFCI1 2018-12 If a ground fault is detected, the GFCI Reset Resetting GFCI Receptacles Use GFCI protection when operat- button pops out, and the circuit opens to...

  • Page 40: Simultaneous Weld And Power

    Complete Parts List is available at www.MillerWelds.com 7-3. Simultaneous Weld And Power Weld Current in Amperes Total Power in Watts 120 V Full kVA Receptacle 240 V Full kVA Receptacle Amperes Amperes 2200 3500 5200 8000 11,000 (Peak) 7-4. Wiring Instructions For Optional 240 Volt, Single-Phase Plug (NEMA 14-50P) The plug can be wired for a 240 V, 2-wire load or a 120/240V, 3-wire load.

  • Page 41: Section 8 − Maintenance And Troubleshooting

    Complete Parts List is available at www.MillerWelds.com SECTION 8 − MAINTENANCE AND TROUBLESHOOTING 8-1. Maintenance Label OM-258413 Page 37...

  • Page 42: Routine Maintenance

    Complete Parts List is available at www.MillerWelds.com 8-2. Routine Maintenance Stop engine before maintaining. See Engine Manual and Maintenance Label Recycle engine for important start-up, service, and storage fluids. information. Service engine more often if * To be done by Factory Authorized Service Agent used in severe conditions.

  • Page 43: Replacing Air Cleaner

    Complete Parts List is available at www.MillerWelds.com 8-3. Replacing Air Cleaner Stop engine. NOTICE − Do not run engine without air cleaner or with dirty element. Engine damage caused by using a damaged ele- ment is not covered by the warranty. Air Intake Tube Hose Clamp Air Cleaner...

  • Page 44: Engine Maintenance Activities

    Complete Parts List is available at www.MillerWelds.com 8-5. Engine Maintenance Activities 259 707 Primary Fuel Filter Add engine coolant as follows: Stop engine and let cool. Oil And Fuel Replace filter according to engine manual. Water Bypass Hose Oil Drain Valve Wipe up any spilled fuel.

  • Page 45: Adjusting Engine Speed

    Complete Parts List is available at www.MillerWelds.com 8-6. Adjusting Engine Speed If engine does not start and stop properly, verify fuel solenoid is installed properly before adjusting engine speed (see Sections A and B following). If engine does not stay at idle speed, verify the throttle solenoid is installed and adjusted properly before adjusting engine speed (see Section C following).
  • Page 46 Complete Parts List is available at www.MillerWelds.com B. Checking Fuel Solenoid Run Position Stop engine. If the engine is low on power or does not start and stop when using the Engine Control switch, check the position of the fuel solenoid in the Off and Run positions, and check solenoid movement.
  • Page 47 Complete Parts List is available at www.MillerWelds.com C. Checking Throttle Solenoid Stop engine. If the engine does not stay at idle speed, verify the the throttle solenoid and linkage is installed properly. Adjusting Throttle Solenoid Throttle Solenoid Jam Nut Solenoid Link Shoulder Bolt Throttle Lever Solenoid Rod...
  • Page 48 Complete Parts List is available at www.MillerWelds.com D. Making Engine Speed Adjustments Perform engine speed adjustments only through side door. Before adjusting engine speed, verify throttle solenoid is installed properly (see Section C on previous page). Check engine speeds with a tachometer or frequency meter (see Maintenance La- bel).

  • Page 49: Troubleshooting Tables

    Complete Parts List is available at www.MillerWelds.com 8-7. Troubleshooting Tables A. Welding Trouble Remedy Low or no weld output; generator pow- Check control settings. er output okay at AC receptacles. Check weld connections. Check fuse F1, and replace if open (see Section 8-4). Have Factory Authorized Service Agent check brushes, slip rings, integrated rectifiers SR2 and SR3, and main rectifier SR1.
  • Page 50 Complete Parts List is available at www.MillerWelds.com C. Engine Maintenance Display Action noFUEL Place Engine Control switch in the Off position, refuel, and start engine. HI H2O Coolant temperature is too high. Allow engine to cool and check coolant level (see Section 8-5). LO OIL Oil pressure is too low.

  • Page 51: Section 9 − Parts List

    Complete Parts List is available at www.MillerWelds.com SECTION 9 − PARTS LIST 9-1. Recommended Spare Parts Dia. Part Mkgs. Description Quantity Recommended Spare Parts ....259935 Filter Kit, Kubota (Includes air cleaner element, fuel, oil filters) .

  • Page 52: Section 10 − Electrical Diagrams

    SECTION 10 − ELECTRICAL DIAGRAMS 258 418-B Figure 10-1. Circuit Diagram For Welder/Generator OM-258413 Page 48...
  • Page 53 Notes OM-258413 Page 49...

  • Page 54: Section 11 − Generator Power Guidelines

    SECTION 11 − GENERATOR POWER GUIDELINES The views in this section are intended to be representative of all engine-driven welder/generators. Your unit may differ from those shown. 11-1. Selecting Equipment Generator Power Receptacles − Neutral Bonded To Frame 3-Prong Plug From Case Grounded Equipment 2-Prong Plug From Double Insulated Equipment...
  • Page 55 11-3. Grounding When Supplying Building Systems Equipment Grounding Terminal Grounding Cable Use #8 AWG or larger insulated copper wire. GND/PE Ground Device Use ground device as stated in electrical codes. Ground generator to system earth ground if supplying power to a premises (home, shop, farm) wiring system.
  • Page 56 11-5. Approximate Power Requirements For Industrial Motors Industrial Motors Rating Starting Watts Running Watts Split Phase 1/8 HP 1/6 HP 1225 1/4 HP 1600 1/3 HP 2100 1/2 HP 3175 Capacitor Start-Induction Run 1/3 HP 2020 1/2 HP 3075 3/4 HP 4500 1400 1 HP...
  • Page 57 11-7. Approximate Power Requirements For Contractor Equipment Contractor Equipment Rating Starting Watts Running Watts Hand Drill 1/4 in. 3/8 in. 1/2 in. Circular Saw 6-1/2 in. 7-1/4 in. 8-1/4 in. 1400 1400 Table Saw 9 in. 4500 1500 10 in. 6300 1800 Band Saw...
  • Page 58 11-8. Power Required To Start Motor Single-Phase Induction Motor Starting Requirements Motor Start Code KVA/HP 10.0 11.2 12.5 14.0 Motor Start Code Running Amperage Motor HP Motor Voltage To find starting amperage: Step 1: Find code and use table to find kVA/HP.
  • Page 59 11-10. Typical Connections To Supply Standby Power Have only qualified persons perform these connections according to all applicable codes and safety practices. Properly install, ground, and operate this equipment ac- cording Owner’s Manual and national, state, and local codes. Do not connect to any elec- trical distribution system normally supplied by utility Fused...
  • Page 60 11-11. Selecting Extension Cord (Use Shortest Cord Possible) Cord Lengths for 120 Volt Loads Use GFCI protection when operating auxiliary equipment. If unit does not have GFCI receptacles, use GFCI-protected exten- sion cord. Do not use GFCI receptacles to power life support equipment. Maximum Allowable Cord Length In ft (m) for Conductor Size In AWG (mm Current Load (Watts)

  • Page 61: Section 12 − Stick Welding (Smaw) Guidelines

    SECTION 12 − STICK WELDING (SMAW) GUIDELINES 12-1. Stick Welding Procedure Weld current starts when electrode touches work- piece. Weld current can damage electronic parts in vehicles. Disconnect both battery Equipment Needed: Tools Needed: cables before welding on a vehicle. Place work clamp as close to the weld as possible.
  • Page 62 12-2. Electrode And Amperage Selection Chart 6010 DEEP 3/32 MIN. PREP, ROUGH HIGH SPATTER 6011 DEEP 6010 5/32 & 6013 EP,EN GENERAL 3/16 6011 7/32 SMOOTH, EASY, 7014 EP,EN FAST 1/16 LOW HYDROGEN, 7018 5/64 STRONG 3/32 SMOOTH, EASY, FLAT 7024 EP,EN 6013...
  • Page 63 12-4. Positioning Electrode Holder End View Of Work Angle Side View Of Electrode Angle After learning to start and hold an arc, practice running beads of weld metal on flat plates using a full electrode. ° ° Hold the electrode nearly per- pendicular to the work, although tilting it ahead (in the direction of °...
  • Page 64 12-7. Conditions That Affect Weld Bead Shape Weld bead shape is affected by electrode angle, arc length, travel speed, and thickness of base metal. Correct Angle ° - ° Angle Too Large Angle Too Small Electrode Angle Drag Spatter Arc Length Normal Too Long Too Short...
  • Page 65 12-10. Welding Groove (Butt) Joints Tack Welds Prevent butt joint distortion by tack welding the materials in position before final weld. Workpiece distortion occurs when heat is applied locally to a joint. One side of a metal plate will curl up toward the weld.
  • Page 66 12-12. Weld Test Vise Weld Joint Hammer Strike the weld joint in the direction shown. A good weld bends over but does not break. If the weld breaks, examine it to determine the cause. If the weld is porous (many holes), the arc length was probably too long.
  • Page 67 Lack Of Penetration − shallow fusion between weld metal and base metal. Lack of Penetration Good Penetration Possible Causes Corrective Actions Improper joint preparation. Material too thick. Joint preparation and design must provide access to bottom of groove. Improper weld technique. Keep arc on leading edge of weld puddle.

  • Page 68: Section 13 − Gmaw Welding (Mig) Guidelines When Using A Voltage-Sensing Feeder

    SECTION 13 − GMAW WELDING (MIG) GUIDELINES WHEN USING A VOLTAGE-SENSING FEEDER 13-1. Typical GMAW (MIG) Process Connections Using A Voltage-Sensing Wire Feeder Weld current can damage electronic parts in ve- hicles. Disconnect both battery cables before weld- ing on a vehicle. Place work clamp as close to the weld as possible.
  • Page 69 13-3. Conditions That Affect Weld Bead Shape Weld bead shape depends on gun angle, direction of travel, electrode extension (stickout), travel speed, thickness of base metal, wire feed speed (weld current), and voltage. ° Push ° Perpendicular Drag Gun Angles And Weld Bead Profiles Short Normal Long...
  • Page 70 13-4. Gun Movement During Welding Normally, a single stringer bead is satisfactory for most narrow groove weld joints; however, for wide groove weld joints or bridging across gaps, a weave bead or multiple stringer beads works better. Stringer Bead − Steady Movement Along Seam Weave Bead −...
  • Page 71 13-7. Troubleshooting − Excessive Spatter Excessive Spatter − scattering of molten metal particles that cool to solid form near weld bead. S-0636 Possible Causes Corrective Actions Wire feed speed too high. Select lower wire feed speed. Voltage too high. Select lower voltage range. Electrode extension (stickout) too long.
  • Page 72 13-10. Troubleshooting − Lack Of Penetration Lack Of Penetration − shallow fusion between weld metal and base metal. Lack of Penetration Good Penetration S-0638 Possible Causes Corrective Actions Improper joint preparation. Material too thick. Joint preparation and design must provide access to bottom of groove while maintaining proper welding wire extension and arc characteristics.
  • Page 73 13-13. Troubleshooting − Waviness Of Bead Waviness Of Bead − weld metal that is not parallel and does not cover joint formed by base metal. S-0641 Possible Causes Corrective Actions Welding wire extends too far out of nozzle. Be sure welding wire extends not more than 1/2 in. (13 mm) beyond nozzle. Unsteady hand.
  • Page 74 13-15. Common MIG Shielding Gases This is a general chart for common gases and where they are used. Many different combinations (mixtures) of shielding gases have been developed over the years. The most commonly used shielding gases are listed in the following table. Application Short Short...
  • Page 75 13-16. Troubleshooting Guide For Semiautomatic Welding Equipment Problem Probable Cause Remedy Too little pressure on wire feed rolls. Increase pressure setting on wire feed rolls. Wire feed motor operates, but wire does not feed. Incorrect wire feed rolls. Check size stamped on wire feed rolls, replace to match wire size and type if necessary.
  • Page 76 Notes...
  • Page 77 Notes...
  • Page 78 Notes...
  • Page 79 Effective January 1, 2019 (Equipment with a serial number preface of MK or newer) This limited warranty supersedes all previous Miller warranties and is exclusive with no other guarantees or warranties expressed or implied. LIMITED WARRANTY − Subject to the terms and conditions Subarc Wire Drive Assemblies below, Miller Electric Mfg.
  • Page 80 Contact the Delivering Carrier to: File a claim for loss or damage during shipment. For assistance in filing or settling claims, contact your distributor and/or equipment manufacturer’s Transportation Department. © ORIGINAL INSTRUCTIONS − PRINTED IN USA 2019 Miller Electric Mfg. LLC 2019−01...

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