Miller Electric 255 - Manual (Page 21)

OM-157 066 Page 17
4-3. Fuses F1 And F2
Ref. ST-800 928-B
Y Turn Off unit, and disconnect
input power.
1 Fuse F1 (See Parts List For
Rating)
F1 protects the 115 volts ac winding
of transformer T1. If F1 opens, all
weld output stops and pilot light PL1
goes out.
2 Fuse F2 (See Parts List For
Rating)
F2 protects the 24 volts ac winding
of transformer T1. If F2 opens, all
weld output stops.
2
1
3/8 in
Tools Needed:
4-4. Changing Drive Roll And Wire Inlet Guide
ST-150 227-D
1 Securing Screw
2 Inlet Wire Guide
Loosen screw. Slide tip as close to
drive rolls as possible without
touching. 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
Tools Needed:
1
3
2
4
5
4-5. Replacing Gun Contact Tip
Ref. 800 797-C
Y Turn Off unit 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: