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GMAW
Push-Pull Gun
OPERATOR'S MANUAL
Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com
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OPERATOR'S MANUAL
CobraMAX
Model numbers K2252-1 & K2252-2
World's Leader in Welding and Cutting Products
Sales and Service through Subsidiaries and Distibutors Worldwide
IM774
™
Safety Depends on You
Lincoln arc welding equipment
is designed and built with safety
in mind. However, your over-
all safety can be increased by
proper installation...and thoughtful
operation on your part. DO NOT
INSTALL, OPERATE OR REPAIR
THIS EQUIPMENT WITHOUT
READING THIS MANUAL AND
THE SAFETY PRECAUTIONS
CONTAINED THROUGHOUT.
And, most importantly, think before
you act and be careful.
Copyright © 2006 Lincoln Global Inc.
MK 091-0525
December 2006
Rev. E
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Troubleshooting
Related Manuals for Lincoln Electric COBRAMAX IM774
Summary of Contents for Lincoln Electric COBRAMAX IM774
- Page 1 GMAW Push-Pull Gun OPERATOR'S MANUAL Model numbers K2252-1 & K2252-2 OPERATOR’S MANUAL Sales and Service through Subsidiaries and Distibutors Worldwide Cleveland, Ohio 44117-1199 U.S.A. TEL: 216.481.8100 FAX: 216.486.1751 WEB SITE: www.lincolnelectric.com RETURN TO MAIN MENU CobraMAX Copyright © 2006 Lincoln Global Inc. World's Leader in Welding and Cutting Products MK 091-0525 December 2006...
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Page 3: Table Of Contents
Safety Considerations Installation ... Section A Technical Specifications ...1 Support Equipment Required ...1 Coolant Recommendations ...1 Gun Lead Connections ...1 Operation ...Section B General ...2 Controls and Settings ...2 Drive Roll and Idler Rolls...3 Accessories ...Section C Optional Kits ...4 Conduits ...4 Snake Skins ...4 Contact Tips ...5... - Page 4 Declaration of Conformity for European Community (CE) Products Note This information is provided for units with CE certification (see rating label on unit). MK Products, Inc. Manufacturer’s Name: 16882 Armstrong Ave. Irvine, CA 92606 CobraMAX Declares that the product: conforms to the following Directives and Standards: Low Voltage Directive: 73/23/EEC Electromagnetic Compatibility (EMC) Directive: 89/336/EEC Arc Welding Equipment Part I: Welding Power Sources: IEC 60974-1...
- Page 5 CobraMAX™ Owner's Manual - Page i...
- Page 6 ELECTRIC SHOCK can kill. 3.a. The electrode and work (or ground) circuits are electrically “hot” when the welder is on. Do not touch these “hot” parts with your bare skin or wet clothing. Wear dry, hole-free gloves to insulate hands.
- Page 7 WELDING and CUTTING SPARKS can cause fire or explosion. 6.a. Remove fire hazards from the welding area. If this is not possible, cover them to prevent the welding sparks from starting a fire. Remember that welding sparks materials from welding can easily go through small cracks and openings to adjacent areas.
- Page 8 CobraMAX™ Owner's Manual - Page iv...
- Page 9 CobraMAX™ Owner's Manual - Page v...
- Page 10 Electric for advice or information about their use of our products. We respond to our customers based on the best information in our posses- sion at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability, with respect to such infor- mation or advice.
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Page 11: Installation
Section A Installation Technical Specifications Wire Capacity .030" - .045" (0.6mm - 1.2mm) solid and hard wire .030" - 1/16" (0.8mm - 1.6mm) aluminum and cored wire Wire Speed 800 IPM (20.3 mpm) Max at rated feeder input voltage (120VAC / 42VAC) Duty Cycle All ratings are using Argon gas 200 Amps/25 Volts... -
Page 12: Operation
Gas Hose The gas hose is secured over the barbed gas fitting with a tie wrap. The cabinet end of the gas hose uses our standard gas fitting (1/8” - 27 nps). Water Hose If so equipped, one end of the water hose is secured over the barbed water fitting with a tie wrap and the other end is connected to the center fitting on the power block. -
Page 13: Drive Roll And Idler Rolls
Drive Roll and Idler Rolls General The CobraMAX gun comes standard with a knurled drive roll and a grooved ™ idler roll, which will handle both steel and aluminum wire with diameters from .030-1/16 inch. Optional insulated V-groove drive rolls are also available for aluminum wire if desired (see optional kits). -
Page 14: Accessories
Section C Accessories Optional Kits Insulated Drive Roll Kits are used to prevent preheating of the wire which may soften it and clog the liner. This picking up of current at the drive rolls rather than at the contact tip is usually not a problem unless using too large of a contact tip or excessively oxidized aluminum wire. -
Page 15: Contact Tips
Contact Tips Heavy Duty Contact Tip - 3/8" Diameter* Wire Size Tip ID .030” (0.8mm) .040” (1.0mm) Spray 1.57” (39.9mm) 621-0390-25 Short 1.82” (46.2mm) 621-0396-25 .035” (0.9mm) .045” (1.1mm) Spray 1.57” (39.9mm) 621-0391-25 .035" (0.9mm) .045" (1.1mm) Short 1.82” (46.2mm) 621-0397-25 .045"... -
Page 16: Maintenance
MK P/N 615-0341 621-0423 615-0248 615-0177 931-0137 Section D Maintenance Periodic Maintenance Your Cobramatic Maintenance of the gun will normally consist of a general cleaning of the wire guide system, including barrel, drive rolls, and conduit at regular intervals Remove spatter build-up from inside of nozzles with a hardwood stick. The only parts on the Cobramatic are the conduit, contact tips, gas cups, front body liners, wire guides, drive and idler rolls. -
Page 17: Troubleshooting
Section E Troubleshooting Trouble 115 VAC Control fuse in feeder/ Control box blown. No wire feed at gun, Micro-switch defective/not feeder not operating, i.e., no being activated. slave motor or brake solenoid. Broken electrical cable. 24 VAC Control fuse in feeder/ Control box blown. -
Page 18: Troubleshooting Guide
Troubleshooting Guide Regardless of which gun or feeder used, all MK Products’ push-pull guns operate on the same principle. The slave motor in the feeder runs at a fast, constant speed, but has very low torque. It is always trying to feed more wire than the gun motor wants, and when the motor gets all it wants, it slows the slave motor, preventing a bird’s nest. -
Page 19: Appendices
Section F Appendices Diagrams / Parts List 001-1420 CobraMAX™ Exploded View ....12 003-2141 Front Body Assembly ......14 Ultra-Flex Air Cooled Lead Assembly . -
Page 20: Mechanical
CobraMAX™ Exploded View CobraMAX™ Owner's Manual - Page 10... - Page 21 CobraMAX™ Owner's Manual - Page 11...
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Page 22: 003-2141 Front Body Assembly
003-2141 Front Body Assembly NOTE: Items #3, 4, and 9 can be ordered together in Kit LE P/N KP2220-1, MK P/N 005-0686. CobraMAX™ Owner's Manual - Page 12 Front Body Assembly 003-2141 No. Qty. Part No. Description Not Available Separately Not Available Separately 325-0206 SCR Ph 10-24-3/8... -
Page 23: Ultra-Flex Air Cooled Lead Assembly
Ultra-Flex Air Cooled Lead Assembly* This power cable has a boot that is common to many assemblies but must be removed from this end when used on the CobraMAX™. *Leads shown for reference only 227 Series Ultra-Flex Cable Assemblies Length Conduit 15"/4/5m 615-0601-15... -
Page 24: Water Cooled Lead Assembly
Water Cooled Lead Assembly* This power cable has a boot that is common to many assemblies but must be removed from this end when used on the CobraMAX™. *Leads shown for reference only 228 Series Ultra-Flex Cable Assemblies Length Conduit #4 Power/Water Cable 15'/4.5m... -
Page 25: Electrical
CobraMAX™ Electrical "W" Clocked Amphenol Connector Viewed from front of connector CobraMAX™ Owner's Manual - Page 15... - Page 26 CobraMAX™ Owner's Manual - Page 16...
- Page 27 CobraMAX™ Owner's Manual - Page 17...
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Page 28: Limited Warranty
LIMITED WARRANTY This warranty supersedes all previous MK Products warranties and is exclusive, with no other guarantees or warranties expressed or implied. LIMITED WARRANTY - MK Products Inc., Irvine, California warrants that all new and unused equipment furnished by MK Products is free from defects in workmanship and material as of the time and place of delivery by MK Products.