Harbor Freight Tools 03664 operating instructions SKU For technical questions, please call

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8.Use the right tool for the job. Do not attempt to force a small tool or attachment to do the work of a larger industrial tool. There are certain applications for which this tool was designed. Do not modify this tool and do not use this tool for a purpose for which it was not intended.

9.Use eye and ear protection. Always wear ANSI approved, arc shaded, impact safety full face shield (not included) when arc welding. Wear an ANSI approved dust mask or respirator when working around metal, chemical dusts, fumes and mists.

10.Maintain tools with care. Keep tools sharp and clean for better and safer performance. Follow instructions for lubricating and changing accessories. Inspect tool cords periodically and, if damaged, have them repaired by an authorized technician. The handles must be kept clean, dry, and free from oil and grease at all times.

11.Disconnect power. Unplug tool when not in use.

12.Remove adjusting keys and wrenches. Check that keys and adjusting wrenches are removed from the tool or machine work surface before plugging it in.

13.Avoid unintentional starting. Be sure the switch is in the Off position when not in use and before plugging in. Do not carry any tool with your finger on the trigger, whether it is plugged in or not.

14.Stay alert. Watch what you are doing, use common sense. Do not operate any tool when you are tired.

15.Check for damaged parts. Before using any tool, any part that appears damaged should be carefully checked to determine that it will operate properly and perform its intended function. Check for alignment and binding of moving parts; any broken parts or mounting fixtures; and any other condition that may affect proper operation. Any part that is damaged should be properly repaired or replaced by a qualified technician. Do not use the tool if any switch does not turn On and Off properly.

16.Guard against electric shock. Prevent body contact with grounded surfaces such as pipes, radiators, ranges, and refrigerator enclosures.

17.Replacement parts and accessories. When servicing, use only identical replacement parts. Use of any other parts will void the warranty. Only use accessories intended for use with this tool. Approved accessories are available from Harbor Freight Tools.

18.Do not operate tool if under the influence of alcohol or drugs. Read warning labels on prescriptions to determine if your judgment or reflexes are impaired while taking drugs. If there is any doubt, do not operate the tool.

19.Maintenance. For your safety, service and maintenance should be performed regularly by a qualified technician.

20.Use proper size and type extension cord. If an extension cord is required, it must be of the proper size and type to supply the correct current to the tool without heating up. Otherwise, the extension cord could melt and catch fire, or cause electrical damage to the tool. This tool requires use of an 220 VAC extension cord of 20 amps minimum capability (up to 30 feet), with wire size rated at 10 AWG. Longer extension cords require larger size wire. If you are using the tool outdoors, use an extension cord rated for outdoor use (signified by “WA” on the jacket).

SKU 03664

For technical questions, please call 1-800-444-3353.

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Contents 03664 For technical questions and replacement parts, please callSave This Manual SpecificationsSafety Warnings and Precautions Read all instructions before using this toolSKU For technical questions, please call Inhalation Hazard Arc Welding Safety Warnings and PrecautionsUnpacking AssemblySKU For technical questions, please call Operation Controls and IndicatorsWelding Part Description MaintenanceParts List Replacing the Wire ReelSKU For technical questions, please call Please Read the Following Carefully Schematic Diagram