Miller Electric S-21E, Technical Manual

Page: 11 / 48

A. Installation Of Spool-Type Wire (Figure 4-1)
4-7. WELDING WIRE THREADING
1. Remove retaining ring from hub.
2. Slide wire spool on hub so that wire feeds off the
bottom of the spool.
3. Rotate wire spool until hole in spool slides over
pin in hub and seats against back flange of the
hub.
4. Insert optional compression spring if required.
5. Reinstall retaining ring to secure wire spool on
hub.
B. Installation Of Optional Wire Reel And Reel-
Type Wire (Figure 4-5)
1. Remove retaining ring and, if applicable, wire reel
assembly from hub.
2. Lay wire reel assembly flat on a table or floor.
3. Remove spanner nut from wire reel assembly.
4. Remove wire retainer, and install wire onto wire
reel. Be sure that wire feeds off bottom of reel.
5. Reinstall wire retainer and spanner nut onto wire
reel.
6. Slide wire reel assembly onto hub, and rotate as-
sembly until hub guide pin is seated in reel.
7. Reinstall retaining ring onto hub.
• Spanner
Nut
• OPTIONAL
Figure 4-5. Optional Wire Reel And Reel-Type Wire
Installation
A
A
WARNING: ELECTRIC SHOCK can kill;
MOVING PARTS can cause injury.
• Do not touch live electrical parts.
• Keep clear of pinch points.
• Do not energize welding powersource orwirE
feeder until instructed to do so.
The welding wire and all metal parts in contaci
with it are energized while welding.
WELDING
WIRE can cause puncture
Wounds; HOT SURFACES can burn skin.
• Do not depress gun trigger untll instructed tc
do so.
• Do not point gun toward any part of the body
any conductive surface, or other personne.
when threading welding wire.
• Allow gun to cool before touching.
FLYING DIRT AND METAL PARTICLES can
injure personnel and damage equipment.
• Point gun liner only in a safe direction awaj~
from personnel and equipment when clean~
ing with compressed air.
Blow out the gun wire 9uide liner with com-
pressed air when changing wire. This will re-
move any metal chips and dirt that may have ac-
cumulated.
CAUTION: LOOSE WELDING WIRE can
cause Injury.
• Keep a firm hold on the wire during installa-
tion, removal, and threading operations.
Spooled wire has a tendency to unravel rapidly
when loosened from the spool.
1.Install the wire as instructed in Section 4-6.
2. Cut off any portion of the free end of the wire
which is not straight. Be sure that the cut end is
free from rough surfaces to permit proper feed-
ing.
3. Adjust hub tension according to Section 4-8 if
necessary.
4. Loosen the pressure adjustment knob on the wire
drive housing, and pivot the pressure arm open.
5. Feed the wire through the inlet wire guide, past
the drive rolls, and on into the gun. Feed approxi-
mately 4 inches (102 mm) of wire into the gun.
6. Close the pressure lever, and secure with pres-
sure adjustment knob making sure the welding
wire is in the drive roll groove and properly
aligned with the inlet and outlet guides (outlet
guide is part of gun).
7. Tighten the pressure adjustment knob to obtain
the proper clamping pressure on the welding
wire. Do not overtighten. Further adjustment can
•Wlre Retainer
SC-127 306
S-21E TM-1571 Page 7