Tweco VA 4000 Ultra-Feed - Manual (Page 27)

ULTRAFEED VA 4000
September 18, 2012 3-5
Art # A-07276
Output Wire Guide
Pressure Arm
Input Wire Guide
Spring Tension Knob
Center Wire Guide
Welding Wire
Tension Lever
Figure 3-4: Threading Wire Into Feedhead
3. Lift the pressure arm and pass the wire through the
output wire guide and into the welding gun assembly
(Refer to welding gun manual).
4. Close the pressure arm, and lock in position with the
tension lever. To adjust the amount of force the bearing
roll exerts on the welding wire, turn the spring tension
knob clockwise for increased force or
counterclockwise 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.
5. Turn the welding machine and wire feeder ON, and
set the wire feed speed control to midrange (Refer to
Figure 4-1). Remove contact tube from welding gun.
Refer to Gun Manual. Press the gun switch or INCH
switch until wire feeds out past the gun nozzle. Thread
the contact tube over the wire and lock into place and
tighten. Cut wire off at about 1/4 inch (6 mm) from
the nozzle.
3.09 Threading Wire Into Feedhead
Refer to Figure 3-4.
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 “unravel” 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. Loosen the spring tension knob and pull the tension
lever forward to unlock the pressure arm.
WARNING
The wire is electrically “HOT” if wire is fed by
depressing the gun switch. Wire contact with the
workpiece will cause an arc with gun switch
depressed. Feed motor will run feeding “HOT” wire.