Miller Electric XR A - Manual (Page 34)

OM-1581 Page 30
6-2. Changing Or Cleaning Gun Drive Roll
Turn Off wire feeder and welding
power source.
1
Top Cover
2 Pressure Roll Assembly
Cut off wire where it enters
pressure roll assembly area.
3
Setscrew
4 Current Pick-Up Tab
This tab helps prevent burnback
caused by welding arcs inside the
contact tip. This tab may be re-
moved to provide an insulated drive
roll. (If tab is removed, a smaller di-
ameter contact tip is recom-
mended. See options in Parts List.)
Lightly grease top of tab before rein-
stalling.
5
Drive Roll
Use wire brush to clean drive roll.
Install drive roll with desired groove
down, and turn drive roll so one
setscrew faces flat side of shaft.
6
Bearing
7 Liner
Line up drive roll groove with bear-
ing groove and liner opening.
Tighten setscrews.
If changing drive roll in feeder,
proceed to Section 6-3.
Thread welding wire through gun,
and adjust drive roll pressure, if
necessary (see Section 4-15).
Close and secure pressure roll
assembly. Reinstall top cover.
Ref. 151 599-F
Tools Needed:
5/64 in
2
6 7
1
5
3
4