19
Identifying and Changing the Drive Rolls.
The unit comes equipped with
.023”
and
.030”
drive rolls. NOTICE:
For
most purposes you will likely want to use
.030”
wire in this unit since it
covers the greatest range of metal thicknesses and amperages within the
capability of this unit.
However, if you change wire size or type, you will
need to change the drive roll to the correct size and type.
This unit uses two drive rolls to feed the wire. The top drive roll is actually
an idler roll used to hold tension and keep the wire in the groove and is
not changeable. Only the bottom drive roll needs to be changed. The
bottom drive roll has two small grooves that are sized for
.023(.025”)
and
.030”
wire. Additional sizes and types of drive rolls are available as
options. The standard installed drive roll is meant to feed hard (solid)
steel wire. The groove on this drive roll has a
“
V
”
shape designed for the
solid wire. A Flux
-
Cored drive roll has a serrated edge to the groove,
which grips the softer, cored wire. Viewing a flux
-
core drive roll from the
top, you will see a
“
zipper
”
like pattern. This should never be used to feed
hard steel or stainless wire or aluminum wire. This will result in damage
to the wire, metal flaking and possible plugging of the MIG gun liner. To
determine the exact size of wire and type you have, look at the side of the
drive roll. The size of the drive roll groove is stamped on the side of the
drive roll closest to the corresponding groove. The type of the drive roll
will also be stamped with a V if it is for solid hard wire. If it is stamped with
a
“
U
”,
this is a special drive roll for feeding aluminum wire. Aluminum
wire is best fed with a spool gun.
The drive roll is held in place by a black thumbscrew. Remove the screw
to expose and change the drive roll. The drive roll is mounted on a bush-
ing. The bushing should be held in place with one finger of one hand
while the other hand removes the drive roll. This will prevent both bushing
and drive roll from being removed from the wire feeder drive shaft. When
removing make sure that the square locating key is not dismounted. If the
key falls out, replace it before replacing the drive roll.
Guiding the Wire Through the Feeder and Gun.
Once the wire spool has been installed, flip the tensioner lever down and
raise the top drive roll to the upper position. See the illustration below.
Gently guide the wire from the spool over through the wire feeder and into
the front section of the gun at least 6 inches. Make sure the wire lays neat-
ly in the groove. Hold it with your finger if necessary as you lower the top
drive roll down and raise the tensioning lever with your other hand. When
complete the wire should look like the illustration on the previous page.
Hint: The wire on the spool is usually bent and threaded through a small
hole in the side of the spool to lock it in place and prevent de
-
spooling of
the wire. Keep one hand on the wire spool to prevent despoiling and cut
the wire loose with a pair of wire cutters. Trim the wire to make sure the
end of the wire is straight and able to be threaded through the wire feeder
mechanism and gun.
After the tensioner is raised back to the vertical position, confirm the wire
is still in the groove and is not riding up on the shoulders of the drive roll.
Turn the welder on and adjust wire feed speed (IPM) to maximum. Re-
move the gas nozzle by twisting it clockwise and pull. Unscrew the contact
tip as shown in the illustration below. Hold the gun cable and gun straight
as possible. Pull the trigger on the gun. The wire should slowly begin to
feed through the gun cable and eventually through the gun. As the wire
exits the gun, allow 3 to 4 extra inches of wire to be fed out past the diffu-
sor. Re
-
install the contact tip over the wire and screw it in clockwise until
it is tight, but not to the point of stripping. Install the gas nozzle.
Setup Guide
Getting Started
Drive Roll Size and Location Info
5
.6mm
=.023”/.025”
.8mm=
.030”
.9mm=
.035”
1.0mm=
.040”
Size/Type Stamping.
(The size is stamped on
same side as corre-
sponding groove.)
Installing the MIG Wire
Assembling the MIG Gun
Gas Nozzle
M6 Contact Tip
Diffusor and Retaining Spring
Gun Neck
Always remove and install the gas nozzle by twisting clockwise.
Flux
-
Cored Cap
(not included, sourced from aftermarket)
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