Installing And Threading Welding Wire - Miller Electric S-74D Owner's Manual

5-6. Installing And Threading Welding Wire

Pressure
Adjust
Rear
Rolls
.
Be sure that outlet cable has proper size
liner for the welding wire size. When
installing gun, position
(extending from outlet wire guide) as
close as possible to drive rolls without
touching.
Install gun. Lay gun cable out straight. Cut off
end of wire. Push wire through guides up to
drive rolls; continue to hold wire. Press Jog
button to feed wire out gun.
OM-1500-10 Page 14
Install wire spool. Adjust tension nut so
wire is taut when wire feed stops.
Pressure
Indicator
Scale
Pressure
Adjust
Front
Rolls
No Wire Slip
NONCONDUCTIVE
SURFACE
Drive Rolls
Back Of Gun
End Of Liner
.
For soft wire or small diameter stainless
steel wire, reduce drive roll pressure on
liner the rear roll to half that of the front rolls.
Install wire guides and
anti-wear guide.
Install drive rolls.
Wire Slips
NONCONDUCTIVE
SURFACE
.
To adjust drive roll pressure, hold nozzle
about 2 in (51 mm) from nonconductive
surface and press gun trigger to feed wire
against surface. Tighten knob so wire
does not slip. Do not overtighten. If con-
tact tip is completely blocked, wire should
slip at the feeder (see pressure adjust-
ment above).Cut wire off. Close cover.
Ref. 156 929-A / Ref. 150 922 / Ref. 156 930 / S-0627-A
Tools Needed:
3/16, 5/64 in
15/16, 3/8 in