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OM-194 430 Page 21
4-3. Unit Overload
If unit is used beyond capacity (excessive wire feed, shorted output, etc.), wire feeds but is not energized. Release gun
trigger to reset this condition.
4-4. Changing Drive Roll And Wire Inlet Guide
ST-150 227-C
Tools Needed:
1
3
2
4
5
1 Securing Screw
2 Inlet Wire Guide
Loosen screw. Slide tip as close to
drive rolls as possible without touch-
ing. Tighten screw.
3 Anti-Wear Guide
Install guide as shown.
4 Drive Roll
Install correct drive roll for wire size
and type.
5 Drive Roll Securing Nut
Turn nut one click to secure drive
roll.
5/64 in
7/16 in
4-5. Aligning Drive Rolls And Wire Guide
Y Turn Off power.
View is from top of drive rolls look-
ing down with pressure assembly
open.
1 Drive Roll Securing Nut
2 Drive Roll
3 Wire Guide
4 Welding Wire
5 Drive Gear
Insert screwdriver, and turn screw
in or out until drive roll groove lines
up with wire guide.
Close pressure roll assembly.
Close door.
Ref. ST-800 412-A
Correct Incorrect
4
3
2
1
5
Tools Needed:
4-6. Replacing Gun Contact Tip
Ref. 800 797-C
Y Turn Off power before
replacing contact tip.
1 Nozzle
2 Contact Tip
Cut off welding wire at contact tip.
Remove nozzle.
Remove contact tip and install new
contact tip. Reinstall nozzle.
1
2
Tools Needed: