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OM-1589 Page 36
11-3. Changing Gun Contact Tip and Liner
150 437
Tools Needed:
Remove top cover and open pressure roll
assembly.
1 Contact Tip Wrench
Insert wrench into nozzle over contact tip.
2 Compression Nut
Loosen nut. Pull out contact tip.
3 Contact Tip
4 Nozzle
Pull wire out nozzle and liner should slide
out. If necessary, tilt nozzle down to remove
liner.
Close pressure roll assembly. Reinstall top
cover.
Install new liner and contact tip over wire. Cut
off wire at end of contact tip.
Tighten nut just until contact tip is secure.
Overtightening nut will damage adapter.
12
34
11-4. Gun Drive Assembly Maintenance
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.
If changing drive roll in feeder, see
Section 11-2.
Thread welding wire through gun.
Close and secure pressure roll as-
sembly. Adjust drive roll pressure, if
necessary (see Sections 3-13 and
3-14). Reinstall top cover.
Tools Needed:
5/16 in
4
3
1
2