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OM-1213 Page 18
6-4. Gun Drive Assembly Maintenance
Ref. 149 967-H / Ref. 800 945-A
Retract wire onto spool.
1 Setscrew
2 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.
3 Drive Roll
Use wire brush to clean drive roll.
Install drive roll with desired groove
down, and turn drive roll so one set-
screw faces flat side of shaft.
4 Bearing
Use wire brush to clean bearing.
Line up drive roll groove with bear-
ing groove and liner opening. Tight-
en setscrews.
Thread welding wire through gun
(see Section 4-3). Close and se-
cure pressure roll assembly. Adjust
drive roll pressure, if necessary
(see Section 4-8). Reinstall top cov-
er.
Tools Needed:
5/16 in
3
1
2
4