MAINTENANCE |
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CONTACT TIP AND GAS
NOZZLE INSTALLATION
1.Choose the correct size contact tip for the elec- trode being used (wire size is stenciled on the side of the contact tip) and screw it snugly into the gas diffuser.
a.Be sure the nozzle insulator is fully screwed onto the gun tube and does not block the gas holes in the diffuser.
2.Slip or screw the appropriate gas nozzle onto the nozzle insulator.
NOTE: Either a standard 0.50 in. (12.7 mm) or option- al 0.62 in. (15.9 mm) I.D.
3.Adjust the gas nozzle as appropriate for the GMAW process to be used.
a.Typically, the contact tip end should be flush to extended 0.12 in. (3.2 mm) for the short- circuiting transfer process and recessed 0.12 in. (3.2 mm) for spray transfer.
LINER REMOVAL AND
REPLACEMENT
NOTE: When you change wire size, a replacement gas diffuser is required. Use the table below to select the proper diffuser so the liner is held securely in place.
LINER REMOVAL, INSTALLATION, AND TRIMMING INSTRUCTIONS FOR MAGNUM 250L
NOTE: The variation in cable lengths prevents the interchangeability of liners between guns. Once a liner has been cut for a particular gun, it should not be installed in another gun unless it can meet the liner cut off length requirement. Liners are shipped with the jacket of the liner extended the proper amount.
1.Remove the gas nozzle and nozzle insulator. See
Figure D.2.
2.Locate the set screw in the gas diffuser which is used to hold the old liner in place.
3.Loosen the set screw with a 5/64 in. (2.0 mm) Allen wrench.
4.Remove the gas diffuser from the gun tube.
5.Lay the gun and cable out straight on a flat surface.
6.Loosen the set screw located in the brass cable connector at the feeder end of the cable and pull the liner out of the cable.
7.Insert a new untrimmed liner into the connector end of the cable.
a.Check the liner bushing stencil to make sure it is the appropriate one for the wire size being used.
8.Fully seat the liner bushing into the connector.
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| Replacement | Size Stenciled on | Fixed Nozzle Gas | Adjustable Nozzle |
Diameter of | Liner | End of Liner | Diffuser Part No. | Gas Diffuser Part |
Electrodes Used | Part Number | Bushing | (and Stencil) | No. (and Stencil) |
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0.030 in. (0.8 mm) | ||||
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0.045 in. (1.2 mm) | ||||
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3/64 in. Aluminum | 3/64 in. (1.2 mm) | |||
(1.2 mm) |
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POWER MIG 255
