Miller Electric 255 warranty Fuses F1 And F2, Changing Drive Roll And Wire Inlet Guide

4-3. Fuses F1 And F2

2

1

Tools Needed:

3/8 in

YTurn Off unit, and disconnect input power.

1Fuse 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.

2Fuse F2 (See Parts List For Rating)

F2 protects the 24 volts ac winding of transformer T1. If F2 opens, all weld output stops.

Ref. ST-800 928-B

4-4. Changing Drive Roll And Wire Inlet Guide

5

1 Securing Screw

3

2 Inlet Wire Guide

Loosen screw. Slide tip as close to

2drive 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.

	1	5 Drive Roll Securing Nut
Tools Needed:		Turn nut one click to secure drive
		roll.
5/64 in	4
7/16 in
		ST-150 227-D

4-5. Replacing Gun Contact Tip

Y Turn Off unit before replacing contact tip.

1 Nozzle

2 Contact Tip

Cut off welding wire at contact tip.

Remove nozzle.

2

Remove contact tip and install new

contact tip. Reinstall nozzle.

1

Tools Needed:

Ref. 800 797-C

OM-157 066 Page 17