Tweco Hefty II CC CV Voltage Sensing Wire feeder - Manual (Page 23)

Style 1 feed rolls consist of a flat, smooth bearing
roll and a double, smooth, vee grooved drive roll.
They feed .024 - .068" hard and tubular wire.
Style 2 feed rolls consist of a flat, knurled bearing
roll and a double, smooth, vee grooved drive roll.
They feed .030 - .045" hard and tubular wire.
Style 3 feed rolls consist of a double, knurled, vee
grooved bearing roll and a double, knurled, vee
grooved drive roll. They feed .045 - 5/64" hard and
tubular wire.
Style 4 feed rolls consist of double, cog bearing
and drive rolls. They feed .045 - .068" tubular wire.
Style 5 feed rolls consist of double, U-grooved
bearing and drive rolls. They feed .035 - 3/64" soft
wire.
NOTE: All grooved feed rolls have their
wire size or range stamped on the side of
the roll. On rolls with different size grooves,
the outer (visible when installed) stamped
wire size indicates the groove in use.
Bearing feed rolls are installed by unscrewing the
upper retaining knob and removing the idler gear.
The bearing feed roll retaining knob is then removed
from the idler gear, and the bearing feed roll is
placed over the lobes on the idler gear. The bearing
feed roll retaining knob is replaced, and this assem-
bly is returned and secured with the upper retaining
knob.
Drive feed rolls are installed by removing the lower
retaining knob, placing the drive feed roll over the
lobes on the drive gear, and securing with the lower
retaining knob.
NOTE: Installation of all styles of feed rolls
for this feeder is identical.
Welding Gun Compatibility And
Installation:
Refer to Figures 3-4 and 3-5.
The HEFTY II STAINLESS wire feeder is de-
signed to be used with most welding guns. In some
cases, a special adapter may be required.
To install the welding gun, simply loosen the gun
clamp knob and insert the welding gun into the
feedhead until it stops. Tighten the gun clamp knob
and connect the welding gun control wires to the
gun switch receptacle.
NOTE: Before inserting the welding gun
into the feedhead, make sure the gun
clamp does not extend into the feedhead;
otherwise, the welding gun cannot be prop-
erly inserted.
Threading Wire Into Feedhead:
Refer to Figure 3-5.
WARNING: ELECTRIC SHOCK
CAN KILL! Make certain the
power source and wire feeder
are turned OFF. Do not turn the
power ON until told to do so in
these instructions.
CAUTION: Use care when handling the
spooled wire as the wire tends to “un-
ravel” when loosened from the spool.
Grasp the end of the wire firmly, and
don’t let it get away from you. Make sure
that the end of the wire is straight and
free of burrs.
1. Place end of the welding wire into the input wire
guide. Feed it through the guide and over the drive
roll groove closest to the feedhead casting.
2. Pass the wire through the output wire guide and
into the welding gun assembly.
3. Lock in position with the spring tension knob.
To adjust the amount of force the bearing feed roll
exerts on the welding wire, turn the spring tension
knob clockwise for increased force or counterclock-
wise for decreased force.
NOTE: If the force applied to the wire is too
great, the welding wire will “bird nest” in the
feedhead and not feed properly.
4. Turn the welding machine and wire feeder
ON, and set the wire feed speed control to midrange
(See Figure 3-2). Remove contact tube from weld-
ing gun. See Gun Manual. Press the gun switch or
INCH switch until wire feeds out past the gun noz-
zle. Place contact tube over the wire and screw into
place and tighten. Cut wire off at about 1/4 inch (6
mm) from the nozzle.
430429-456
INSTALLATION
4-2 November 17, 1999