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11.
Close drive roll
housing,
and
adjust
tension
(see
ap
propnate
Owners
Manual).
12.
Press the
gun
trigger,
and
run
the
welding
wire out
beyond
the end of the gas nozzle.
Cut the wire
off
so
it extends
out 1/4 to
3/8 in.
(6.4
mmto 9.5
mm)
from
end of nozzle.
13.
Set the Wire
Speed
control
slightly higher
than
an
ticipated
wire
speed.
14.
Hold the end of the gas nozzle
approximately
1/2 in.
(12.7 mm)
from the
workpiece.
15. Press the gun
trigger.
Gas
starts to
flow,
wire
starts
to
feed,
and the
arc
will be established. If the
welding
wire
appears
to
slip, adjust
drive roll tension accord
ing
to
wire feeder Owners
Manual.
16. After the controls
on
the
welding
power
source
and
the wire feeder
(if applicable)
have been
adjusted
for
normal
operation,
the
welding
power
source
(and
wire
feeder)
will
function
automaticallywhen
the
gun
trigger
is
pressed. Releasing
the gun
trigger
will
ex
tinguish
the
arc
and
cause
the wire feed and
gas
flow
to
stop.
4-2.
SHUTflNG DOWN
1.
Stop welding.
2.
Turn oft
welding
power
source
and wire feeder.
3.
Turn off the
shielding
gas and
water
supplies
at
their
source.
a
WARNING:
HIGH
CONCENTRATION
OF
SHIELDING GAS
can
harm health
or
kIll.
Shut
off
gas
supply
when
not in
use.
SECTION 5- MAINTENANCE
5-1.
INSPECTION AND UPKEEP
Usage
and
shop
conditions
will
determine
frequency
and
type
of maintenance
required.
a
WARNING:
ELECTRIC SHOCK
can
kill;
WELDING
WIRE
can
cause
puncture
wounds;
HOT SURFACES
can cause severe
burns.
Do
not
touch live electrical
parts.
Shut down
welding
power
source
and wire
feeder before
working
on
gun.
Disconnect gun from wire feeder before
in
specting, maintaining,
or
servicing.
Allow
a
cooling period
before
servicing.
1.
Inspect
gun
for broken areas, cracks and loose
parts:
tighten, repair
and
replace
as
required.
2.
Carefully
remove
any weld
spatter
or
dirt that has
accumulated around nozzle
opening
and inside
nozzle.
3.
Repair
or
replace
as
required
all hose and
cables;
give particular
attention
to
frayed
and cracked insu
lation and
areas
where it
enters
equipment.
4.
Remove grease and
grime
from
components
and
moisture from electrical
parts
and cables.
5.
Blow
out
casing
with
compressed
airwhen
changing
wire.
This
removes
any loose metal
chips
and dirt
that
may
have accumulated.
AA
CAUTION: FLYING DIRT
AND METAL PARTI
CLES
can
Injure personnel
and
damage
equipment.
Point gun finer
only
in
a
safe direction
away
from
personnel
and
equipment
when
cleaning
with
compressed
air.
5-2.
CONTACT TUBE REPLACEMENT
(Figure
3-1)
a
WARNING:
ELECTRIC SHOCK
can
kill;
WELDING
WIRE
can
cause
puncture
wounds;
HOT SURFACES
can cause severe
burns.
Do
not
touch five electrical
parts.
Shut down
welding
power
source
and wire
feeder before
working
on
gun.
Disconnect gun from wire feeder before in
specting, maintaining,
or
servicing.
Allow
a
cooling period
before
servicing.
1.
Remove nozzle and insulator.
2.
Cut off any
portion
of electrode wire which extends
beyond
end of contact tube.
3.
Remove
contact
tube,
and
replace
with
new
contact
tube.
4.
Reinstall
nozzle,
and
resume
operation.
5-3.
CHANGING WIRE SIZES AND REPLACING
LINER
a
WARNING:
ELECTRIC SHOCK
can
kill;
WELDING
WIRE
can
cause
puncture
wounds;
HOT SURFACES
can cause severe
burns.
Do
not
touch live electrical
parts.
Shut down
welding
power
source
and wire
feeder before
working
on
gun.
Disconnect gun from wire feeder before
in
specting, maintaining,
or
servicing.
Allow
a
cooling period
before
servicing.
Table 5-1 shows
parts
that
are
required
for each wire
size. Some
parts
are common
to
more
than
one
wire
size. Check Table 5-1
for
part
changes
when
changing
from
one
wire
size
to another.
OM-1541
Page
4
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