Threading Welding Wire Through Xr Guns - Miller Millermatic 350P Technical Manual

4-15. Threading Welding Wire Through XR Guns

For XR-A Edge Gun:
Turn On
Welding Power
Source.
For XR-A Pistol Gun:
Turn On
Welding Power
Source.
For XR-A Pistol Gun:
Feed wire to check drive roll pressure.
Tighten knob enough to prevent slipping.
Tools Needed:
.
Do not exceed midrange setting.
TM-1327 Page 20
1
2 3
1
Remove barrel assembly
before threading wire
through gun.
Nonconductive
Surface
!
Welding wire is electrically live
when gun trigger is used to jog
wire.
.
Refer to Section NO TAG for instruc-
tions on feeding wire through welding
power source.
1 Pressure Roll Assembly
Lay gun cable out straight.
Open top cover, and open pressure roll
assembly.
Press gun trigger until about 4 in. (102 mm)
of wire is sticking out front of gun. Insert
wire into barrel liner and tighten barrel as-
sembly. Install correct size contact tube
and install collet nut.
Close top cover on gun. Press trigger
switch until about 6 in. (152 mm) of wire is
sticking out end of contact tip. Cut off wire.
Close and latch door.
.
XR Edge gun drive roll pressure
should be set at minimum.
1 Pressure Roll Assembly
2 Drive Roll
3 Thumbscrew
Lay gun cable out straight. Open top
cover, and lift pressure arm and open
pressure roll assembly. If not already
done, remove gun barrel assembly.
Manually thread wire along drive roll
groove. Close pressure roll assembly.
Press gun trigger until about 4 in. (102 mm)
of wire is sticking out front of gun. Insert
wire into barrel liner and tighten barrel as-
sembly. Install correct size contact tube
and install collet nut. Reinstall gun cover.
4 Pressure Adjustment Knob
See final pressure adjustment at bottom of
page.
Cut off wire. Close and latch door.
!
Turn welding power source Off.
Ref. 804 544-B / 801 556 / Ref. 151 666-C
Millermatic 350