Lincoln Electric IDEALARC SP-255 - Manual (Page 34)

D-2 MAINTENANCE
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.
This screw should only be gently
tightened. Overtightening will split or
collapse the liner and cause poor wire
feeding.
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.
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
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)
CAUTION
FIGURE D.1
Liner trim length for the 250SP gun