Installing And Threading Welding Wire - Miller PipeWorx 400 VRD Owner's Manual

5-21. Installing And Threading Welding Wire

Pressure
Adjust
Rear
Rolls
.
For best wire feeding performance, be
sure that the outlet cable has the proper
size liner for the welding wire size being
used. Also, when the gun is installed, the
liner extending from the back of the gun
should be as close to the drive rolls as
possible, 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.
Install wire spools. Adjust tension nuts 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
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
contact tip is completely blocked, wire
should slip at the feeder (see pressure
adjustment above).Cut wire off. Close
cover.
Ref. 156 929-A / Ref. 150 922 / Ref. 156 930 / 804 743-A
Tools Needed:
3/16, 5/64 in.
15/16, 3/8 in.
OM-253 906 Page 39