27
Side Description and Explanation:
1.
Wire Spool Carrier Assembly.
Make note of the
correct assembly order if disassembled.
The or-
der in which they are assembled is important to
be able to provide enough resistance to prevent
de
-
spooling of the wire.
When inserting the
spool , make sure the small tab or dowel on the
inside of the spool holder is correctly located in
one of the recesses made into the spool. After
installing the spool of wire, tighten the tensioner
nut located so that the wire will not continue to
roll more than a 1/8th to 1/4th of a turn after the
wire has stopped feeding. Do not tighten the
tensioning screw to the point that the drive roller
slips or the feeder motor strains while feeding
the wire. The spool carrier assembly can accom-
modates rolls of wire
8”
in diameter. The carrier
can also support the use
4”
rolls of wire by slight-
ly altering the way the carrier is assembled,.
Reverse the outer
“
shoulder
”
where the tension-
er nut is located so the carrier sandwiches the
4”
spool in the middle of the assembly. See picture
this page for example of correct assembly.
2.
Polarity Buss Bar.
Note the
“+”
and
“
-
”
symbols
located on the inside of the unit next to the buss
bar terminals. The unit is shipped with the torch
polarity connected to the positive terminal. Posi-
tive polarity is designed to weld with solid wires.
To weld with most Flux
-
core or dual shielded
wires, the polarity must be changed to negative.
To change the polarity to negative, simply loosen
the top screw and remove the other screw locat-
ed on the positive polarity terminal. By pivoting
the buss bar on the screw that has been loos-
ened, the buss bar can be easily swung into posi-
tion over the negative terminal. Reinstall the
screws, lining up the holes in the buss bar with
the negative terminal threads. Install and tight-
en both buss bar screws. Always remember to
alter your work clamp to reflect the polarity
change if using flux core. If the buss bar is con-
nected to negative, then the work clamp should
be in the
“+”
positive output terminal.
Standard
polarity for MIG is
“+”
(DCEP) with the work
clamp in the negative.
3.
Wire Feed Assembly.
Note the numbers on the
side of the tensioner. These numbers are a refer-
ence point to help properly tension the wire so
that the drive roller will not slip. Do not over
-
tension the wire because it can create a condi-
tion known as birds nesting, where the wire will
tangle up around the feeder and will not slip if
the wire burns back into tip, sticks fast in the weld
puddle or other resistance is met. This will continue
wrap the wire around the drive mechanism or will
jam wire inside the gun liner until the trigger is
released. Considerable effort is usually needed to
clear out a bird
’
s nest condition. Too little tension
will result in wire slippage and cause rapid wear on
the drive components. Do a feed test before be-
ginning a weld. Occasional cleaning of the feeder
mechanism is necessary to prevent wear and dam-
age to the feeder and to the MIG gun liner. Regu-
larly monitor any metal flaking and dirt build up
that may occur in the wire feed area. Clean it away
gently with compressed air. Also to improve MIG
gun liner service life, blow out the gun liner with
compressed air after running a complete full size
roll through. Do not use harsh cleaners or solvents
to maintain the cleanliness of the feeder mecha-
nism. Felt wire lubricators may be bought and
used to keep feeding cleanly while using steel or
stainless wire.
Do not forget to change the contact
tip size when changing to a another wire diame-
ter.
Depending upon the diameter of the wire
used, the MIG gun liner may need to be changed to
work properly. However, the 15 series gun should
be able to feed most all the capable MIG wire di-
ameters without requiring a liner change. If trou-
ble is experienced with feeding, purchase a liner
specifically sized for your diameter wire.
Setup Guide and Component Identification
Section 2
Above Image: Correct assembly of wire carrier for use with
4”
spools.
