Replacing Gun Contact Tip; Aligning Drive Rolls And Wire Guide; Unicable Repair - Miller Electric Millermatic 250 Owner's Manual

4-4. Replacing Gun Contact Tip

Tools Needed:
4-5. Changing Drive Roll And Wire Inlet Guide
Tools Needed:
5/64 in
7/16 in

4-6. Aligning Drive Rolls And Wire Guide

3
2
1
Tools Needed:

4-7. Unicable Repair

To repair or replace unicable, order Unicable Clamp Kit, Part Number 172 018.
3
2
1
4
Correct
4
5
2
1
5
Incorrect
Y Turn Off power.
1 Nozzle
2 Contact Tip
Cut off welding wire at contact tip.
Remove nozzle.
Remove contact tip and install new
contact tip. Reinstall nozzle.
ST-149 326-B
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.
ST-150 227-C
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
OM-1308 Page 13