MAC TOOLS MW13O - Drive Assembly

C.
Short
Circuit
Shutdown
If
contact
tube
is shorted
and
sticks
to
workpiece,
the
unit shuts
down,
but
fan
runs.
To
resume
operation,
release
gun
trigger,
turn
OFF
unit,
and
remove
contact
tube from
workpiece.
Check contact
tube and
replace
if
damaged.
Turn
ON
unit
to
continue
operation.
4-2.
Drive
Assembly
Mainten~
~e
READ
Sectio
SAFETY
BLOCKS
at start
~f
n
4
before
proceeding.
Turn
OFF
and
unplug
unit.
1
Wire
Spool
2
Gun
Contact
Tube
Cut
welding
wire
off
at
contact
tube.
Retract
wire
onto
spool
and
secure.
3 Pressure
Roll
Arm
4
Cotter
Pin
5
Pin
6
Screw
7
Bearing
Remove
bearing
as
shown. Install
new
bearing
and
secure
with
screw.
Reinstall
arm
onto
pin
and
secure
2
with
cotter
pin.
8
Setscrew
9
Smooth
Groove For Hard
Wire
10
Drive
Roll
Remove
drive
roll
as
shown.
Use
a
wire
brush
to
clean drive roll.
Push drive
roll
onto
shaft
with
de
sired
groove
in.
Turn drive
roll
so
one
setscrew
faces
flat side
of
shaft,
and
tighten
both
setscrews.
11
Knurled
Groove
For
Flux-
Cored
Wire
12 Wire
Inlet
Guide
Remove
guide
by
pressing
on
barbed
area
or
cutting
off
one
end
near
housing
and
pulling
it
out
of
hole.
Push
new
guide
into
hole
from
rear
until it
snaps
in
place.
Thread
welding
wire
(see
Section
2~6).
Close
door.
Tools
Needed:
~=
5~.
ST-1555041ST154
199
Figure
4-2.
Drive
Assembly
Maintenance
OM-154
404
Page
7