Miller PORTA-MIG Owner's Manual - Page 25

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Miller PORTA-MIG Owner's Manual
IMPORTANT: If
use
of
an
8 in.
(203 mm) spool
wire is
desired,
it will be necessary
to
obtain the
optional
com
pression spring
and install it between
spool
and retain
ing ring.
1.
Remove
retaining ring
from hub.
2.
Slide wire
spool
on
hub
so
that wire
feeds off
bot
tom
of the
spool.
3.
Rotate
wire
spool
until hole in
spool
slides
over
pin
in hub and seats
against
back of
flange
of hub.
4.
Reinstall
retaining ring
to
secure
wire
spool
on
hub.
4-9.
ADJUSTMENT OF HUB TENSION
(Figure
4-6)
WARNING: ELECTRIC SHOCK
can
kill.
Do
not
touch live electrical
parts.
Shut
down wire
feeder and
welding
power
source,
and disconnect
input
power
employ
ing lockout/tagging
procedures
before mak
ing
internal connections.
Open
feeder
case
according
to
Section
4-2
before
beginning
this
procedure.
Close and
secure case
when
procedure
is
done.
Lockout/tagging
procedures
consist of
pad
locking
line disconnect switch
in
open
position,
removing
fuses from fuse
box,
or
shutting
off and
red-tagging
circuit breaker
or
other disconnect
ing
device.
The
welding
wire should unwind
freely
off wire
spool,
but
hub tension should be
sufficient
to
keep
wire
taut
and
prevent
backlash when
gun
trigger
is released. Check
hub tension
by slowly pulling
wire toward drive
assem
bly.
If
adjustment
is necessary,
tighten
or
loosen hex
nut
on
end of hub
assembly.
4-10.
WELD CABLE CONNECTIONS
(Figure
4-1
and
4-3)
fk
WARNING: ELECTRIC SHOCK
can
kill.
_____
Do
not
touch live electrical
parts.
Shut
down wire
feeder and
welding
power
source,
and disconnect
input
power
employ
ing lockout/tagging procedures
before
mak
ing
internal connections.
Open
feeder
case
according
to
Section
4-2
before
beginning
this
procedure.
Close
and
secure case
when
procedure
is
done.
Lockout/tagging
procedures
consist of
pad
locking
line disconnect switch in open
position,
removing
fuses from fuse
box,
or
shutting
off and
red-tagging
circuit breaker
or
other disconnect
ing
device.
1.
Route the
positive (+)
weld
cable,
with
appropri
ate
lug
attached from
welding
power
source
through
lead
access
opening
at
rear
of
case.
2.
Connect
positive
(+)
weld cable
to
terminal
on
lower
portion
of drive
assembly,
and
secure
it with
supplied
lock washer.
4-11.
WELDING WIRE THREADING
a
WARNING:
ELECTRIC
SHOCK
can
kill;
MOVING PARTS
can cause
serious
injury.
Do
not
touch live electrical
parts.
Keep
away from
moving
parts.
Do
not
energize welding
power
source or
wire
feeder until instructed
to
do
so.
The
welding
wire and all metal
parts
in contact
with it
are
energized
while
welding.
WELDING
WIRE
can
cause
puncture
wounds;
HOT SURFACES
can cause severe
burns.
Do
not
press
gun
trigger
until instructed to do
so.
Do
not
point
gun toward any
part
of the
body,
any conductive
surface,
or
other
personnel
when
threading welding
wire.
Allow gun
to
cool before
touching.
FLYING
DIRT AND METAL
CHIPS
can
injure
personnel
and
damage equipment.
Point gun liner
only
in
a
safe direction away
from
personneland equipment
when
cleaning
with
compressed
air.
Blow
out
the gun wire
guide
liner with
com
pressed
air when
changing
wire. This will
re
move
any
metal
chips
and dirt that
may
have
ac
cumulated.
1.
Open
feeder
case as
instructed
in
Section
4-2.
2.
Install wire
as
instructed in Section 44-8.
3.
Cut off any
portion
of the free end of wire which is
not
straight.
Be
sure
that
cut
end is
free from
rough
surfaces
to
permit
proper
feeding.
4.
Loosen the pressure
adjustment
knob
on
the wire
drive
housing,
and
pivot
the
gear
cover
open.
5.
Feed the wire
through
the inlet wire
guide,
past
the drive
rolls,
and
on
into the outlet wire
guide.
Feed
approximately
4
inches
(102 mm)
of wire
into the outlet wire
guide.
6.
Close
the gear
cover
and
secure
with pressure
adjustment making
sure
the gear teeth mesh
to
gether properly
and the
welding
wire is
in the drive
roll
grooves.
Be
sure
the
U-cog
rolls
are
properly
aligned (see
Section
4-5).
7.
Tighten
the pressure
adjustment
to obtain the
proper
clamping
pressure
on
the
welding
wire. Do
not
overtighten.
Further
adjustment
can
be make
when the wire feeder is
put
into
operation.
Close feeder
case as
instructed
in
Section
4-2.
Lay
gun cable
assembly
out
flat and
straight (no
coils in the
cable/conduit).
8.
9.
OM-1220
Page
19