Gun Maintenance; Troubleshooting - MAC TOOLS MW165 Owner's Manual

4-3. Gun Maintenance
4-4.
Troubleshooting
Replace
contact
tip.
I
___
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.
READ SAFETY BLOCKS
at start
of
Section
4 before proceeding.
sw~m10.1 10/91
1
4
5
2
7
Turn Off
and unplug unit.
1
Wire
Spool
Cut
welding wire
off
at contact tip.
Retract wire
onto spool and
secure.
2 Gun
Securing Nut
Disconnect
trigger leads. Loosen
nut and
remove gun
and trigger
leads.
3 Nozzle
4 Contact lip
5 Head Tube
6 Liner Collet
Disassemble gun
as
shown.
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.
Install collet onto liner.
Install
contact
tip
and nozzle.
Insert gun into feeder and mark
where liner touches
drive
roll.
Remove gun and
cut liner
oft.
ReInstall gun
so
that liner is
as
close
as
possible to drive rolls
without
touching.
Thread welding wire (see Section
2-7). Close door.
Ref. ST-t55 506A
/
5T-155
509-A
Tools Needed:
~ 3/8,5/16
in
Figure 4-3. Gun Maintenance
Welding Trouble
No weld
output;
wire does not feed.
j-...~ Secure power cord plug in
receptacle.
READ SAFETY BLOCKS
at start of
Section
4
before
proceeding.
Remedy
-...~
-~L__4-lB
-~L
-..J
Section
2-6
2-2
Motor fuse Fl open, replace Fl.
Replace building
line fuse
or
reset circuit breaker
it open.
Secure gun
trigger leads
or
repair leads,
or
replace trigger switch.
LN~e~~Put;_wire
feeds.
No weld output;
wire does not feed; fan
~ -.4
Thermostat TP1 open
(overheating). Allow fan to
run;
the thermo-
-~
4-1 A
motor
continues to
run.
]
stat will
close when the unit has cooled.
Low weld
output.
F-. -~
Connect work
clamp to get good metal to metal contact.
1-..
Figure 3-1
H-.~
4-3
-
Connect unit
to
proper
input voltage
or
check for low line voltage.
J -..J
2-6
OM-185 356 Page 11