JUKI DDL-5550-6 - Thread Tension Adjustments; Adjusting Needle Thread Tension; Adjusting Bobbin Thread Tension; Thread Take-Up Spring Adjustments

1.
Adjusting the
needle thread
tension
1)
As
you
turn thread
tension
No. I nut
O
clockwise
(in
'
direction
@
).
the thread remaining
on the needle
after
thread trimming
will
be shorter.
2) As
you
turn
nut
O
counterclockwise
(in
direction
@
1.
the thread
length will
be
longer.
3)
As
vou
turn thread
tension
No. I nut
O
clockwise
(in
'
direction
O
).
the needle thread
tension
rvill be
increased.
4)
As
you
turn
nut
O
counterclockwise
(in
direction
O
),
the needle
thread tension will be
decreased.
2. Adjusting
the
bobbin thread tension
1)
As
you
tr:f tension adjust
screw
@
clockwise
(in
direction
€ t.
the bobbin thread
tension will
be
increase d.
2)
As
you
turn screw
@
counterclockwise
(in
direction
O ),
the
bobbin thread
tension will be decreased.
.''.l...?i;,,'
1. Changing
the stroke
of thread take-up
spring
O
l)
Loosen setscrew
(O
2)
As
you
turn tension
post
O
clockwise
(in
direction
6
),
t!. stroke
of the
thread take-up
spring
will be
lncrease o.
3) As
you
turn
the knob counterclockwise
(in
direction
@
),
the
stroke will
be decreased.
2. Changing the
pressure
of thread
take-up
spring
O
1)
Loosen setscrew
O
,
and remove
tension
post
@
'
2) Loosen
setscrew
@
3) As
you
turn tension
post
@
clockwise
(in
direction
@
),
the
pressure
will be
increased.
4)
As
you
turn
the
post
counterclockwise
(in
direction
@
),
the
pressure
will be decreased.
l)
2)
r)
4)
To stop
the machine with its
presser
foot up, turn
hand
lifter
Q
in direction
@
The
presser
foot will
go
up about 5.5 mm and stop.
The
presser
foot
will
go
back
to its original
position
when
hand lifter is turned down in direction
@
.
Using the
knee lifter,
you
can
get
the standard
presser
foot lift
of about 10
mm
and
the maximum lift of about
13
mm.
14. PRESSER
TFOOT
PRE$,$URE
.'
''
:
i .
Loosen nut
@
.
As
you
turn
presser
spring regulator
O
clockwise
(in
direction
@
),
the
presser
foot
pressure
will be
increased.
As
you
turn the
presser
spring regulator counter-
clockwise
(in
direction
@
),
the
pressure
will
be
decreased.
After
adjustment, tighten
nut
€)
1)
2)
3)
4) For general
fabrics, the
standard height
spring regulator
is
29
to 32 mm
(5kg,1
DDL.sss0H-6).
of
the
presser
(7kg
for
the