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MAINTENANCE | |||||||
SAFETY PRECAUTIONS | CONTACT TIP AND GAS NOZZLE | ||||||
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| INSTALLATION |
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| WARNING |
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| 1. Choose the correct size contact tip for the electrode | ||
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| being used (wire size is stenciled on the side of the | |
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| ELECTRIC SHOCK can kill. | |||
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| contact tip) and screw it snugly into the gas diffuser. | |||
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| • Have an electrician install and | 2. Screw the appropriate fixed gas nozzle fully onto | ||
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| service this equipment. | |||
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| the diffuser. Either the standard .50" (12.7 mm) | |||
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| • Turn the input power off at the | |||
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| flush nozzle or other optional flush or recessed | |||
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| fuse box before working on | (spray arc) nozzle sizes may be used. (See Table | ||
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| equipment | D.2 in this section.) |
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| • Do not touch electrically hot | 3. If using optional adjustable | ||
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| parts. | |||
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| Table D.2 in this section. |
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(READ THE SAFETY PRECAUTIONS IN | • Be sure the nozzle insulator is fully screwed onto | ||||||
THE FRONT OF THIS MANUAL BEFORE | the gun tube and does not block the gas holes in | ||||||
WORKING ON THIS MACHINE.) | the diffuser. |
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GENERAL MAINTENANCE | • Slip the appropriate gas nozzle onto the nozzle | ||||||
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| insulator. Either a standard .50" (12.7 mm) or | |
In extremely dusty locations, dirt may clog the air pas- | optional .62" (15.9 mm) I.D. | ||||||
sages causing the welder to run hot. Blow dirt out of | may be used and should be selected based on | ||||||
the welder with | the welding application. |
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eliminate excessive dirt and dust |
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parts. |
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| * Adjust the gas nozzle as appropriate for the | ||||
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| GMAW process to be used. Typically, the con- | |
The fan motors have sealed ball bearings which | tact tip end should be flush to .12" (3.2 mm) | ||||||
require no service. | extended for the | ||||||
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| and .12" (3.2 mm) recessed for spray transfer. | |
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DRIVE ROLLS AND GUIDE PLATES
After every coil of wire, inspect the wire drive mecha- nism. Clean it as necessary by blowing with low pres- sure compressed air. Do not use solvents for cleaning the idle roll because it may wash the lubricant out of the bearing. All drive rolls are stamped with the wire sizes they will feed. If a wire size other than that stamped on the roll is used, the drive roll must be changed.
For instructions on replacing or changing drive roll, see “Wire Drive Rolls” in Operation section.
GUN TUBES AND NOZZLES
1.Replace worn contact tips as required.
2.Remove spatter from inside of gas nozzle and from tip after each 10 minutes of arc time or as required.
GUN CABLE CLEANING
To help prevent feeding problems, clean cable liner after using approximately 300 pounds (136 kg) of elec- trode. Remove the cable from the wire feeder and lay it out straight on the floor. Remove the contact tip from the gun. Using an air hose and only partial pressure, gently blow out the cable liner from the gas diffuser end.
