White 312 - TROUBLESHOOTING PERFORMANCE PROBLEMS

cHECK]NG
PERFRMANc
PRonLMs
WHAT
To
Do
PROBLEM
PROBABLE
CAUSE
CORRECTION
—
Feed
dog
down.
—
taise
feed
dog,
Fabric
not
—
Machine
not
moving
—
oving
stop
motion
moving
t;tch
length
dial
in
0
position
—
‘oving
dial
to
1
4
—
ight
pressure
on
presser
foot
—
ncrease
pressure on
presser
foot
—
ncorrect
letting
of
needle.
—
teset
needle,
Breaking
Needle
—
leedle
bent
—
laplace
new needle
—
ulling
fabric.
—
)o
riot
pull
fabric.
—
ricorreci
using
needle
thread
and
fabric
—
Correct
using
needle
thread,
and
fabric
—
Incorrect
position
of
zigzag
width
dial
—
Moving
to
correct
position
—
Improper
threading
—
Rethread
machine
Breaking
Upper
—
Tight
upper
thread
tension
—
Loosen
upper
thread
tension
Thread
—
Needle
bent.
—
Replace
new
needle.
—
Nicks
or
burrs
on
shuttle
—
Replace
shuttle
or
polish
off
burrs
completely
—
Tight
bobbin
thread
tension
—
Loosen
bobbin
thread
tension
Breaking
Bobbin
—
Incorrect
setting
of
needle
—
Reset
needle
Thread
—
Improper
threading.
—
Rethread
machine.
—
Dust
and
thread
in
shuttle.
—
Clean
shuttle.
Machine
Jamming
—
No
oil
—
Need
oil
Knocking
Noise
—
Dust
and
thread
in
shuttle
—
Clean
shuttle
—
Tension
too
tight
—
Reset
Pucker
ing
—
Sewing
foot
pressure
too
strong.
Regulating
sewing
fqot
pressure.
-
Incorrect
using
fabric,
needle
and
thread
*
Correct
using
fabric
needle and
thread