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No
weld
output; wire
does not
feed;
fan
~
-.
motor
continues
to
run
and
pilot light
is
oft.
Section
2-5
4-2
-
-
2~4
4
4-4.
Gun Maintenance
READ SAFETY BLOCKS
at start
of
Section
4
before
proceeding.
FLYING METAL CHIPS AND DIRT
can cause
injury
and
damage equipment.
Point gun away from
people
and
in
a
safe direction when
blowing
out with
compressed
air.
cwan,toI
09
Turn
OFF
and
unplug
unit.
Tools Needed:
1
Wire
Spool
~
Cutwelding
wire off atcontacttube.
3/8
in.
Retract wire
onto
spool
and
se
cure.
2
Gun
Securing
Knob
Loosen knob and
remove
gun
and
trigger plug.
3
Nozzle
3
4
Contact Tube
5
Head Tube
6
Liner
Collet
Disassemble gun
as
shown.
5
7
Liner
Pull liner from this end. Blow gun
casing
out with
compressed
air.
Insert
new
liner
into gun
casing
until
even
with end of head tube.
6
Install collet onto liner.
Install
contact
tube and nozzle.
Insert
gun
into feeder and mark
where liner touches drive roll. Re
move
gun and
cut
liner oft. Rein
stall gun
so
that liner is
as
close
as
possible
to
drive
rolls
without
touching.
Thread
welding
wire
(see
Section
2-6).
Close door.
Ref.
ST-149
529-C /
Ref.
ST-155
509
Figure
4-3.
Gun Maintenance
4-5.
Troubleshooting
j
READ SAFETY
BLOCKS
at start of
-.
SectIon
4
before
proceeding.
Welding
loubie
No
weld
output;
wire does
not
feed.
1---~
Remedy
Secure
power cord
plug
in
receptacle.
Motor fuse
Fl open,
replace
fuse.
Replace building
line
fuse
or
reset circuit
breaker
if
open.
Secure gun
trigger plug
In
receptacle
or
repair
leads,
or
replace
trigger
switch.
TherrnostatTPl
open
(overheating).
Allow fan
to
run;
the thermo
stat closes when the unit has cooled.
No weld
output;
wire feeds.
Low weld
output
-
Connect work
clamp
to
get good
metal
to metal contact
Replace
contact tube.
---1__4-1
Figure
3-2
~
4-4
-s(
Connect
unit
to
proper
input voltage
or
check for low line
voltage.
~
-.~
2-5
OM-154 500
Page
8
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