Specifications

4.
If
used,
turn
off
water
supply
and
blowout
water
lines
with
compressed
air.
Ifawater
circulating
coolant
system
is
used
where
the
temperature
may
possibly
fall
below the
freezing
point,
add
sufficient
antifreeze
to
the
coolant
system
tank
and
operate
the coolant
system long enough
to
properly
mix
the
antifreeze
with
the
water.
SECTION 4- MAINTENANCE
4-1.
INSPECTION
AND
UPKEEP
Usage
and
shop
conditions
will determine
fre
quency
and
type
of
maintenance.
Inspect
equipment
as
follows:
1.
Make
sure
welding
machine
power
switch
is
OFF.
2.
Inspect
torch
for
broken
areas,
cracks
andloose
parts:
tighten,
repai~
and
replace
as
required.
3.
Carefully
remove
any
weld
spatter
of
foreign
matter
which
may
accumulate
around
the
nozzle
orifice.
Use
a
hardwood
stick,
never
a
metal
tool.
4.
Repair
or
replace,
as
required,
all
hose
and
cable;
give
particular
attention
to
frayed
and
cracked
insulation
and
areas
where
it
enters
equipment.
5.
Remove
grease
and
grime
from
components;
moisture
from electrical
parts
and
cable.
6.
Blow
out
the
casing
with
compressed
air
when
changing
wire.
This
will remove
any
metal
chips
and
dirt
that
may
have
accumulated.
42.
CHANGING
WIRE
SIZE
(Figure
4-1)
Each
time
the
wire
size is
changed,
the
gun
or
torch
and control/feeder
must be
ad~pted
for
use
with the
new
size
wire.
This consists
of
changing
the
wire
contact
components
in
the
gun
or
torch
and
the
drive roll
gears
and
guides
in
the
control/
feeder.
For
proper
gun
or
torch
wire
guide
com
ponents,
refer
to
appropriate
gun
or
torch
manual.
To
adapt
the
gun
arid
torch
and
control/feeder
for
the
new
wire
size,
proceed
as
follows:
1.
Position
all
power
switches
to
OFF.
2.
Cut
four 15 inch
pieces
of
wire
(10)
and
tie
around the
wire
coil between each
reel
finger
(7).
This
is to
prevent
the wire
from
unraveling
when
the
coil
or
wire
is removed
from
either
the wire reel
assembly
(1)
or
hub
assembly
(8).
3.
Grasp
the
wire
close
to
spool
to
prevent
from
unwinding.
Cut
the
welding
wire
(10)
between
where
the
wire
is
grasped
andwhere
it enters
the
drive
roll
assembly
(11).
4.
-Tie
the
wire
(10)
to
the
edge
of
wire
coil
or
spool
(1)
and
remove
coil
or
spool
from
control/
feeder.
5.
Loosen
the
pressure
adjustment wing
nuts
(3)
by
turning
in
counterclockwise
direction.
6.
Remove
welding
wire
(10)
from
torch(5)
(orgun)
and
drive
roll
assembly
(11).
7.
Select
the
correct
wire size
drive
roll
gears
(2)
and
wire
guides
(4)
from
Table
2-3.
8.
Remove
the
drive
roll
gears
(2)
from the drive
roll
gear
shaft
(9).
9.
Remove
the
wire
guides
(4)
from drive
roll
assembly
(11)
and
replace
with
proper
wire
guides
(4)
from Table
2-3.
~0.
Install
proper
drive
roll
gears
(2).
11.
Remove
gas
nozzle
(6)
from end
of
torch
(5)
(or
gun).
12.
Refer
to
Torch
or
Gun
Manual
for
proper
com
ponents.
Install
or
replace
torch
or
gun
com
ponents
as
required.
13.
Replace
gas
nozzle
(6).
14.
Refer
to
paragraph
29. G.
for Installation
and
Threading
procedures
of
new
wire
size.
LEGEND
1.
Wire Reel
Assembly
2.
Drive Rolls
3.
Pressure
Adjustment
Wing
Nuts
4.
Wire
Guides
5.
Torch
6.
Gas Nozzle
7.
Reel
Fingers
8.
Hub
Assembly
9.
Drive Roll
Gear Shaft
10.
Electrode
Wire
11.
Drive
Roll
Assembly
AC-056 132-bA
Figure
4-1.
Changing
Wire
Size
Page
8