Miller Electric DS-74D12 Swingarc, Owner'S Manual

Page: 19 / 44

OM-1500-13 Page 15
4-11. Installing And Threading Welding Wire
Tools Needed:
3/16, 5/64 in
3/8, 15/16 in
Install wire spool. Ad-
just tension nut so
wire is taut when wire
feed stops.
Install wire guide.
Pressure
Indicator
Scale
Pressure
Adjust
Install drive rolls.
NONCONDUCTIVE
SURFACE
NONCONDUCTIVE
SURFACE
No Wire Slip Wire Slips
Drive Rolls
End Of Liner
Gun Cable
Pressure
Adjust
.
Be sure that outlet cable has proper
size liner for the welding wire size.
When installing gun, position liner
extending from outlet wire guide as
close as possible to drive rolls with-
out 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.
.
For soft wire or small diameter stainless
steel wire, reduce drive roll pressure on
the rear roll to half that of the front rolls.
.
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.
803 186 / 152 648-A / 803 020 / 802 966 / Ref. 137 391-A / 802 954 / Ref. S-0627-A