Lincoln Electric SP-255 manual 2MAINTENANCE, Liner Removal Replacement

FIGURE D.1

Liner trim length for the 250SP gun

D-2MAINTENANCE

5.Adjust the gas nozzle as appropriate for the GMAW process to be used. Typically, the contact tip end should be flush to .12" (3.2 mm) extended for the short-circuiting transfer process and .12" (3.2 mm) recessed for spray transfer.

LINER REMOVAL AND

REPLACEMENT

NOTE: Changing the liner for a different wire size requires replacement of the gas diffuser per the table below to properly secure the different liner.

			Fixed	Adjustable
			Nozzle Gas	Nozzle Gas
	Replacement	Size Stencilled	Diffuser	Diffuser
Diameter of	Liner Part	on End of	Part No.	Part No.
Electrodes Used	Number	Liner Bushing	(and Stencil)	(and Stencil)
.025-.030" Steel	M16087-2	.030" (0.8 mm)	S19418-3	S19418-2
(0.6-0.8 mm)
.035-.045" Steel	M16087-1	.045" (1.2 mm)	S19418-3	S19418-1
(0.9-1.2 mm)
3/64" Aluminum	M16107-1	(Plastic Liner)	S19418-3	S19418-1
(1.2 mm)

LINER REMOVAL, INSTALLATION,

AND TRIMMING INSTRUCTIONS

FOR MAGNUM 250SP

NOTICE: The variation in cable lengths pre- vents 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 cutoff length requirement. Liners are shipped with the jacket of the liner extended the proper

amount.

1.Remove the gas nozzle (and nozzle insulator, if used) to locate the set screw in the gas diffuser which is used to hold the old liner in place. Loosen the set screw with a 5/64" (2.0 mm) Allen wrench.

2.Remove the gas diffuser from the gun tube.

3.Lay the gun and cable

IDEALARC SP-255

out straight on a flat surface. Remove the liner nut from the Fast-Mate™ connector end of the cable and pull the liner out of the cable.

4.Insert a new untrimmed liner into the connector end of the cable. Be sure the liner busing is stencilled appropriately for the wire size being used.

5.Fully seat the liner bushing into the con- nector. finger tighten the liner nut onto the cable connector. The gas diffuser, at this time, should not be installed onto the end of the gun tube.

6.With the gas diffuser still removed from the gun tube, be sure the cable is straight, and then trim the liner to the length shown in Figure D.1. Remove any burrs from the end of the liner.

7.Screw the diffuser onto the end of the gun tube and securely tighten. Be sure the gas diffuser is correct for the liner being used. (see table left and diffuser stencil.)

8.Tighten the set screw in the side of the gas diffuser against the cable liner using a 5/64" (2.0 mm) Allen wrench.

CAUTION

This screw should only be gently tightened. Overtightening will split or collapse the liner and cause poor wire feeding.