Husqvarna Viking Huskylock 901 User manual

Huskylock 901
Operating Manual

Use foot control type YC-482T for USA/Canada and YC-190 for other countries with overlock machine
Model 901.
OVERLOCK MACHINE
Record in space provided below the Serial No. of this
appliance.
The Serial No. is located rear of arm.
Serial No.
Model No. 901
Retain these numbers for future reference.

This houshold sewing machine is designed to comply with IEC/EN 60335-2-28 and UL1594
IMPORTANT SAFETY INSTRUCTIONS
When using an electrical appliance, basic safety precautions should always be followed, including the
following:
Read all instructions before using this household sewing machine.
DANGER - To reduce the risk of electric shock:
• A sewing machine should never be left unattended when plugged in. Always unplug this
sewing machine from the electric outlet immediately after using and before cleaning.
• Always unplug before relamping. Replace bulb with same type rated 15 Watt.
WARNING
- To reduce the risk of burns, fire, electric shock, or injury to persons:
• Do not allow to be used as a toy. Close attention is necessary when this sewing machine is
used by or near children and infirm persons.
• Use this sewing machine only for its intended use as described in this manual. Use only
attachments recommended by the manufacturer as contained in this manual.
• Never operate this sewing machine if it has a damaged cord or plug, if it is not working properly, if
it has been dropped or damaged, or dropped into water. Return the sewing machine to the nearest
authorized dealer or service center for examination, repair, electrical or mechanical adjustment.
• Never operate the sewing machine with any air openings blocked. Keep ventilation openings of
the sewing machine and foot controller free from the accumulation of lint, dust, and loose cloth.
• Keep fingers away from all moving parts. Special care is required around the sewing machine needle.
• Always use the proper needle plate. The wrong plate can cause the needle to break.
• Do not use bent needles.
• Do not pull or push fabric while stitching. It may deflect the needle causing it to break.
• Switch the sewing machine off (“0”) when making any adjustment in the needle area, such
as threading needle, changing needle, threading bobbin, or changing presser foot, etc.
• Always unplug sewing machine from the electrical outlet when removing covers, lubricating,
or when making any other user servicing adjustments mentioned in the instruction manual.
• Never drop or insert any object into any opening.
• Do not use outdoors.
• Do not operate where aerosol (spray) products are being used or where oxygen is being
administrated.
• To disconnect, turn all controls to the off (“0”) position, then remove plug from outlet.
• Do not unplug by pulling on cord. To unplug, grasp the plug, not the cord.
• Keep fingers away from moving parts, especially the area near the blades.
SAVE THESE INSTRUCTIONS
For the USA and Canada
This sewing machine has a polarized plug (one blade wider than the other). To reduce the risk of
electric shock, this plug is intended to fit in a polarized outlet only one way. If the plug does not fit
fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install the
proper outlet. Do not modify the plug in any way.

Contents
1.SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-1. Name of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1-2. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1-3. Connecting Foot Control and Power Cord . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1-4. Setting Telescopic Thread Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1-5. Opening and Closing Front Cover and Side Cover . . . . . . . . . . . . . . . . . . . . . 4
1-6. Changing Needles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.THREADING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2-1. Threading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2-2. Changing Thread . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2-3. Test Sewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.SEWING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3-1. 4-Thread Overlock Stitch Using 2 Needles . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Before Sewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Presser Foot Lifter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Beginning and End of Sewing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Presser Foot Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Thread Tension Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Differential Feed Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Stitch Width Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Stitch Length Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Sewing Curved Seams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3-2. Setting Waste Tray . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3-3. 3-Thread Overlock Stitch Using 1 Needle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3-4. 2-Thread Overlock Stitch Using 1 Needle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Conversion to 2-Thread Overlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Stitch Selection Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Thread Tension Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3-5. How to Roll Hem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3-Thread Rolled Hem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2-Thread Rolled Hem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3-6. Corded Overlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4-1. Replacing the Cutters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4-2. Changing the Light Bulb. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4-3. Oiling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4-4. Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4-5. Storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4-6. Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.TABLE OF SEWING FABRICS, NEEDLES AND MACHINE SETTINGS . . . . . . . 26
7.OPTIONAL ACCESSORIES............................................................................. 27~30
7-1. Gathering Foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
7-2. Piping Foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7-3. Elastic Foot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
7-4. Blind Hem Foot (0.5mm / 1.0mm) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
9.INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

1. SUMMARY
1-1. Name of Parts
–1–
1. Spool pin
2. Presser foot lifter
3. Thread take up lever
4. Pressure regulator screw
5. Thread tension support
6. Telescopic thread stand
7-1. Left needle thread tension dial
7-2. Right needle thread tension dial
7-3. Upper looper thread tension dial
7-4. Lower looper thread tension dial
8. Front panel
9. Side cover
10. Stitch length adjuster
11. Presser foot
12. Stitch width adjusting dial
13. Upper cutter
14. Tweezers
15. Front cover
16. Handwheel (Right side of the machine)
17. Differential feed dial
18. Lamp cover
12345678
918 10 11 12 13 14 15 16 17

–2–
1-2. Accessories
Needle plate for rolled hem (B)
Lower cutterScrew drivers
Tweezers 2-Thread overlock convertor
Needles ❈Spool holder (4 pcs.)
Thread Net (4 pcs.) Oiler
Cleaning brush Vinyl cover
Accessory Box Waste tray
HA✕1T
Size
#11....2 pcs.
#14....3 pcs.

–3–
❈
❈❈
➁
➀
OFF ONOFF ON
1-3. Connecting Foot Control and Power Cord
Connect the foot control cand power cord d.
Before plug in your machine, be sure that the
voltage is same as that of your machine.
(indicated on the plate on the back of the
machine).
❈Specifications vary from country to country.
1-4. Setting Telescopic Thread Stand
Extend the telescopic thread stand to its full
height, then turn until it locks against the stop.
Turn on the power and the light switch.
Always turn off the switch and unplug the machine
when not in use; changing needles, presser foot,
or needle plate; or servicing/cleaning the machine.
The harder you press the foot control, the faster
the machine runs.
When the power switch is turned off, the machine
will not operate even with pressure on the foot
control.
❈Electronic foot control (for USA/Canada only)
This foot control gives full penetration power
even at slow speed for all sewing needs.
❈Electronic type of
foot control
(for USA/Canada
only)

–4–
• How to Open the Side Cover:
a. Push the cover to the left to unlock; and
b. Swing the cover back away from you.
• How to Close the Side Cover:
a. Push the cover to the right; and
b. Lock into place.
• Setting the Tweezers
Take out the tweezers from the accessory box to
set it inside the front cover.
1-5. Opening and Closing Front Cover and Side
Cover
• How to Open the Front Cover
a. Push the cover to the right as far as it will go; and
b. Pull it downward.
• How to Close the Front Cover
a. Pull the cover upward; and
b. Slide to the left until it locks.
❈The front cover has a safety switch and the
machine will not sew when the front cover is not
closed all the way.
Front Cover
Side Cover
Tweezers

–5–
➀➀➀➀
➁➁➁
➁
➂➂➂➂
➃➃
➃
➃
➄
➄
➅
➅
➄
➄
➅
➆
➇
➇
➇
➈
➈
➉
(C)
(D)
➆
➇
➈
➉
➆
➇
➈
➄
➅
(A) (B)
A
1-6. Changing Needles
Replace the needles in the following order:
Note: Unplug the machine before replacing the
needles.
(1) Bring needles to its highest position by turning
the handwheel toward you.
(2) Loosen the needle clamp screw and remove
two needles together.
(3) With the flat side away from you, insert two
new needles all the way up into the groove of
the needle bar.
Use standard home sewing machine needles size
#11(#75) or #14(#90).
Changing Presser Foot
❈Turn the machine off.
1. Raise the presser foot.
2. Raise the needles to its highest position by
turning the handwheel toward you.
3. Push the red button A and the foot will come off.
4. Place the new foot with the pin right underneath
the groove of the ankle and lower the presser
foot. The foot will snap back into place.
2. THREADING
2-1. Threading
When threading the machine from the beginning,
threading must be carried out in the following
sequence:
First: Lower looper threading (A)
Second: Upper looper threading (B)
Finally: Needle threading (C, D)
(1) Upper looper threading (A)
• Bring the upper looper to its lowest position by
turning the handwheel toward you.
• Draw thread from spool and pass it through
guide cof the thread stand and then, in order,
through guides d~ j(Fig. A).
• Thread the eye of upper looper kusing
tweezers. Cut the thread leaving about 10cm
(4”) of thread tail (Fig. D).
• Close the front cover.
Needle clamp screw
Removing
Attaching
Fig. A

–6–
➈
➉
⑨
10cm
11
10cm
➉
11
(2) Lower looper threading (B)
Open the front cover and the side cover.
Take the thread drawn from the spool and pass it
through guide cof the thread stand and then, in
order, through guide dand thread tension dial e
(Fig. A).
Pass the thread through guides fghi and j.
Bring the lower looper to the far left position by
turning the handwheel toward you, and pass the
thread through lower looper thread guide k.
Pass thread through lower looper slit lfrom back
to forward (Fig. B).
Move the lower looper slightly to the right by
turning the handwheel toward you.
Then thread the eye of lower looper
11
using
tweezers.
Cut the thread leaving about 10cm (4”) of thread
tail (Fig. C).
(3) Right needle threading (C)
• For easy threading, disengage the moveable
cutter by turning it downward. Push the upper
cutter holder screw Awith the forefinger of your
left hand and turn the right end of the holder C
with your right fingers in the direction of arrow B
(Fig. E).
• Take the thread drawn from spool, and pass it
through thread guides c~ i. Then thread the
eye of right needle jfrom front to back using
tweezers.
Cut the thread leaving about 10cm (4”) of thread
tail (Fig. E).
(4) Left needle threading (D)
• Take the thread drawn from spool, and pass it
through thread guides c-e, f-i, and thread
the eye of left needle jfrom front to back (Fig.
A, E).
• Return the moveable cutter to the cutting position.
Warning:
Make sure the cutter is returned to the cutting
position before start sewing. Otherwise, it may
cause some serious damage to your machine.
Fig. B
➇
➆
➆
❈
10cm
A
CB
Fig. C
Fig. E
Fig. D
As the upper cutter is sharp, handle
the moving part with care.

–7–
2-2. Changing Threads
The following is an easy way to change threads;
(1) Cut the thread in use near the spool (behind
the telescopic thread stand). Place the new
thread on the spindle and tie it to the end of the
original thread.
(2) Raise the presser foot.
(3) Set tensions to 0 so that the thread knot can
pass through the guides smoothly. Draw out
the looper thread until the thread knot comes
to about 10 cm (4”) past the presser foot.
(4) When changing the needle thread, cut off the
thread knot before it reaches the eye of the
needle. This prevents bending or damaging the
needle.
To make threading easier, use tweezers.
Tying threads Cutting thread
Needle eye

–8–
When using synthetic threads that easily unwind
from the spool, slip the net over the thread from
the bottom of the spool leaving the thread hanging
loosely at the top as shown.
When using standard thread spool, insert the
spool holder (supplied with the machine) as shown
(leave about 2mm between the spool and the
holder).
2-3. Test Sewing
• Ensure that the upper cutter moves against the
lower cutter correctly by turning the handwheel
slowly toward you. If it is not set correctly, check
if there is any fabric or waste thread stuck
between the cutters.
• Turn the handwheel toward you while holding all
4 threads and applying slight tension.
Check all 4 threads wind around the stitch
finger of the needle plate. If all 4 threads do
not wind around the stitch finger of the needle
plate, check and make sure that each thread is
threaded correctly.
Net

–9–
3. SEWING
3-1. 4-Thread Overlock Stitch Using 2 Needles
Before Sewing
When threading is complete, sew a few inches
of chain stitches.
Presser Foot Lifter
Position the fabric by lowering the presser foot
lifter to raise the presser foot.
Place the fabric underneath the presser foot and
push the fabric toward the front of the cutter.
Lower the presser foot.
Note: For thin and middleweight fabrics, there is
no need to raise the presser foot.
Beginning and End of Sewing
(1) Beginng of sewing
Place your left hand on the fabric to push it
slightly until the edge of the fabric passes the
presser foot.

–10–
Draw the finished fabric gently backward and to
the left as the machine is operating and make
chain stitches. This is called chain stitch sewing.
Then cut the threads 2 ~ 5cm (1-2”) from the
presser foot.
❈Do not pull it out roughly as the needle may
bend and break.
For a neater finish, pull thread ends back through
the seam using hook or yarn needle.
(2) End of sewing
Make chain stitches at the end of the sewing to
prevent the threads from coming undone and to
prepare for the next sewing (this is called chaining
off).
Presser Foot Pressure Adjustment
The presser foot pressure is pre-adjusted for
fabrics of medium (standard) thickness.
Adjustment is necessary only when you work on
very thin or very thick fabrics.
Accordingly, sew thinner fabrics with less pressure
and thicker fabrics with more pressure. Increase
or decrease the pressure of the presser foot by
turning the adjustment screw in the direction as
shown.
Tighten Loosen

–11–
➃
➁
➀
➂
1234
2
3
4
4
5
6
4
5
6
4
5
6
Thread Tension Adjustment
Adjust thread tensin to suit the type of fabric
and size of thread used. As the number on the
thread tension discs increases, the thread tension
becomes tighter.
(1) Correct tension
• Lower looper thread and upper looper thread
should be well balanced with same tension (both
looper threads should cross at the edge of the
fabrics).
• Needle threads should not be too loose or too
tight, but equally balanced tension.
(2) When the upper looper thread is unbalanced
and lies underneath the fabric:
Tighten the thread tension of the upper looper
(Dial e) or loosen the thread tension of the lower
looper (Dial f).
Lower looper
thread
Right needle
thread
Upper looper
thread
Left needle
thread
Lower looper
thread
Left needle
thread
Right needle
thread
Upper looper
thread
Wrong side
Right side
Wrong side
Right side

–12–
1234
2
3
4
4
5
6
4
5
6
4
5
6
1234
2
3
4
4
5
6
4
5
6
4
5
6
1234
2
3
4
4
5
6
4
5
6
4
5
6
(3) When the lower looper thread is unbalanced
and appears on the top-side of the fabric:
Tighten the thread tension of the lower looper
(Dial f) or loosen the thread tension of the upper
looper (Dial e).
(4) When the left needle thread is too loose:
Tighten the thread tension of the left needle (Dial
c) or loosen both looper threads (Dial eand f).
(5) When the right needle thread is too loose:
Tighten the thread tension of the right needle
(Dial d).
Lower looper
thread
Left needle
thread
Right needle
thread
Upper looper
thread
Lower looper
thread
Left needle
thread
Right needle
thread
Upper looper
thread
Lower looper
thread
Left needle
thread
Right needle
thread
Upper looper
thread
Wrong side
Right side
Wrong side
Right side
Wrong side
Right side

–13–
Differential Feed Adjustment
The feed teeth work independently of each other
to give perfect results when sewing speciality
fabrics.
Use differential feed to prevent stretching of knit
fabrics and puckering of lightweight fabrics.
❈“N” indicates the neutral position.
Refer to the following chart and test stitch performance on a scrap of fabric you are going to use.
Indicator
Differential
feed dial
Result from
adjustment
Differential
feed ratio
Differential feed
dial is set at “N”
Fabric
Non-stretch
lightweight
fabrics
Stretch knit
fabrics
Lightweight
fabrics Georgette 0.7-N
Medium
woven
fabrics
Knit
Jersey
N
N-2

–14–
Stitch Width Adjustment
• Adjust the stitch width from 4.2mm to 6.2mm
according to the kind of fabric. Typically, wider
stitch widths are used for heavier fabrics.
• The standard width is 4.5mm.
• Open the side cover to adjust the width.
(1) To increase the stitch width, turn the stitch
width adjustment dial to a larger number.
(2) To decrease the stitch width, turn the stitch
width adjustment dial to a smaller number.
(3) This figure shows that the stitch width between
the left needle and the edge of the fabric is
4.5mm.

–15–
Stitch Length Adjustment
The machine is pre-set to 2.5mm stitch length for
regular seaming and overlock.You may adjust the
stitch length from 1mm (narrow rolled hemming)
to 5mm by adjusting the stitch length adjustment
lever.
❈For normal overlock, set the stitch length from
2.5mm to 4.4mm. A stitch length less than
2.5mm is used only for rolled hemming.
❈Adjust the stitch length according to the fabrics
and threads (see table on p. 21).
Sewing Curved Seams
For inside curves, guide the fabric gently with the
trimming line of the fabric under the right front of
the presser foot.
By applying pressure to the fabric with your left
hand, at the same time, apply a little pressure
in the opposite direction with your right hand as
shown.
For outside curves, apply pressure in the opposite
direction of the above.