Ultrafeed Guidebook
ULTRAFEED LS-1 & LSZ-1
®
GUIDEBOOK
SET-UP • USE • MAINTENANCE • TROUBLESHOOTING • SCHEMATICS
Table of Contents
Welcome to Your
Ultrafeed® Sewing Machine!
You are now the proud owner of one of the toughest, most
versatile portable sewing machines around.
With the Ultrafeed, you can go from your home to the dock and sew up projects from
sails and boat covers to upholstery. This guidebook will give you an in-depth look
at your machine, all its power and features, as well as teach you proper use and
maintenance and give helpful troubleshooting advice.
Ultrafeed ® Safety Ultrafeed ® Set-Up 1
2
Ultrafeed ® Maintenance 21
Lubrication 21
Marine Use & Potential for Rust 21
LS-1 Lubrication Points 22
LSZ-1 Lubrication Points 25
Thread 2
Needles 3
Winding Bobbins 5
Threading the Machine 7
Troubleshooting the Ultrafeed ® 28
Removing & Installing Bobbin Case 9
Thread Tension Doesn't Release 28
Installing Bobbin in Bobbin Case 10
Inconsistent Stitch Tension 29
Picking Up Bobbin Thread 11
Clutch Will Not Disengage 30
12
Removing the Hook to Clean the Shuttle
Race Guide and Free Thread Jams 30
Using the Ultrafeed ® Starting to Sew 12
Regulating Stitch Length 13
Sewing in Reverse 13
Turning Corners 13
Switching from Straight to Zigzag Stitch
(LSZ-1 Only) 14
Straight Stitch Needle Positioning
(LSZ-1 Only) 14
Thread Tension Adjustment 15
Adjusting Pressure Foot Tension
17
Removing Material from Under
the Presser Foot 17
Home Sewing 18
Welting & Cording Application 19
Skipped Stitches 31
Thread Issues 33
Needle Issues 37
Bobbin Winding Issues 38
Belt Issues 39
Ultrafeed Timing 40
Hook/Driver Gap 48
®
Schematics 49
Specifications 63
Warranty 64
Ultrafeed® Safety
Ultrafeed® Set-Up
Please observe the following when using your Sailrite sewing machine:
Thread
1. Do not operate if you or the machine are
wet or may become wet.
2. Operate the machine on a firm, level
surface with adequate room for safe
operation.
3. Observe caution when placing your hands,
other body parts, or clothing near any
moving parts including but not limited to
the walking foot, needle, balance wheel,
and belts.
7. Do not drop the machine.
8. Wear protective eye wear when sewing.
9. Wear shoes when operating the foot
pedal.
10.Provide supervision when allowing
children or those unfamiliar with the
Ultrafeed® operations to use the machine.
Recommended needle sizes are roughly one size
larger than those recommended for household machines.
11.Do not use the machine around flammable
materials.
T HR E A D
SI Z E
G OV.
SIZE
T E X T IL E
SIZE
T EN S IL E
S T R EN GT H
N EEDL E
SIZE
FA BR IC W EIG H T
R EC O M M EN D ED
4. Do not run the machine without its covers
in place.
12.Do not use a plug adapter or extension
cord that bypasses the ground pin.
Gen. Purpose
N/A
N/A
N/A
#10 or 12
< 6 oz.
5. Do not stop the movement of the balance
wheel with your hands.
13.When plugging the foot control wiring
into the machine, be cautious to connect
the receptacles correctly to avoid electric
shock.
V-30
AA
30
4.5 lb.
#12 or 14
< 1.5 oz.
V-46
B
45
7.1 lb.
#14 or 16
< 3 oz.
V-69
E
70
10.6 lb.
#16 or 18
3–6 oz. & Sunbrella
V-92
F
90
14.2 lb.
#18 or 20
6–10 oz. & Sunbrella
Profilen
N/A
N/A
6.7 lb.
#14 or 16
3–20 oz. & Sunbrella
6. Always use the proper voltage required for
the motor.
WARNING: Some products may be fabricated from materials which may contain
chemicals known to the State of California to cause cancer, birth defects or other
reproductive harm.
1
Ultrafeed® sewing machines can handle any polyester, nylon, cotton, Profilen
or monofilament thread from general purpose to heavy-duty V-92.
This chart offers needle and thread size recommendations for sewing standard, woven fabrics. Needle and thread recommendations for sewing
speciality fabrics are available online in our Thread & Needle Recommendation Guide, downloadable from every fabric detail page.
www.sailrite.com
2
Ultrafeed ® Guidebook: Ultrafeed® Set-Up
Needles
A
1
Ultrafeed® sewing machines require 135x17 needles sizes #12 to 22 or
135x16 leather needles, all available at Sailrite. A size #20 needle is used for
most medium to heavy sewing.
Ball point needles are specifically designed
for use with knit or stretchy materials.
SD1 needles are optimized for sewing heavy,
dense assemblies.
E
D
Needle Installation
Round Point
Ball Point
SD1
DI needles are ideal for working with leather.
DI Leather
3
B
3
C
Needle Types
Round point needles are used for most
standard sewing. Serv7 needles are modified
round point needles that have a humped
scarf for optimal loop formation and prevent
skipped stitches.
2
Ultrafeed® needles are round on top, unlike
home sewing machine needles. As a result,
proper installation must be exercised carefully.
Improperly installed needles are the main
reason users call for help. Please be sure
that the needle eye is not twisted.
The needles have two distinct sides (1 & 2).
One side has a long channel or groove (B)
(locate this groove with your fingernail if you
cannot see it), and the other side has a scarf
(D) i.e., a carved out area, just above the
needle eye (C).
When installed, the side with the needle eye
and groove should be facing outward i.e. to the
left as you face the machine.
CAUTION: If the needle is inserted the wrong
way, the machine will skip stitches and break
thread.
To make sure your needle is inserted far
enough, you can look through the sighting hole
(3, E) near the bottom of the needle bar. The
top of the needle should be fully visible in the
sighting hole and pushed all the way to the top.
A Needle bar thread guide hole
B Needle groove
C Needle eye
D 3/16 inch (5mm) ~ height of scarf
E Sighting Hole
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4
Ultrafeed ® Guidebook: Ultrafeed® Set-Up
Winding Bobbins
Disengage the Clutch i.e.
Posi-Pin Clutch System:
Thread the Bobbin
On the machine:
A partially wound V-92 bobbin is already
loaded in the machine. Skip this step if you
wish to test sew with the pre-loaded bobbin.
To prepare your machine to wind bobbins,
first disengage the Posi-Pin Clutch System, to
allow for bobbin winding without running the
machine (4).
1. Thread comes off top of cone to thread
stand arm (A).
D
Simply pull the pin out of the balance wheel
and place it in the center hole as shown to
store (5).
A
B
To continue sewing, re-engage the clutch:
1. Push the Posi-Pin gently into any of the
three Posi-Pin holes in the balance wheel.
2. Rotate the balance wheel while lightly
pushing on the Posi-Pin until you feel it
connect with any of the 4 bushing holes.
3. Push the pin all the way in and release.
2. Pass through thread post (B).
3. Wrap around bobbin tensioner (C).
4. Run under and up through a hole in top
of bobbin (D). Place bobbin on post and
push to the right. Hold onto thread tail
briefly and power machine with the clutch
disengaged to wind bobbin. Stop after
several rotations and cut the thread tail off
flush with the bobbin side.
5. Continue winding until the bobbin is full.
Then remove the bobbin from the winder
post by pushing the post to the left and
pulling the bobbin off. Cut the thread.
It's faster to wind while you sew!
C
>P
osi-Pin clutch
ENGAGED
5
>P
osi-Pin clutch
DISENGAGED
Run thread to the bobbin winder from an extra
cone of thread. Simply place the second cone
beside the primary cone and lead the thread up
through the same guides. Follow normal bobbin
winding instructions but do not disengage the
clutch.
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6
Ultrafeed ® Guidebook: Ultrafeed® Set-Up
F
B
C
Threading the Machine
1. Thread comes off top of cone to thread
stand arm (A).
6
G
D
2. Pass the thread through one hole in the
thread post (most direct route to bobbin
tensioner) (B). For home sewing, use the
post to hold the thread spool.
3. Pass through pig tail of bobbin tensioner
(C).
E
A
4. Loop through ear holes (D).
5. Thread through upper tension (shown
without cover knob) (E). Make sure lift
lever (F) is raised up to release tension
plates so thread can pass through.
6. Pass through take-up arm (right to left)
(G) and then under end cover.
7. Pass through the needle bar thread guide
hole (H) and then down through the
needle eye from left to right (I).
7
H
I
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8
Ultrafeed ® Guidebook: Ultrafeed® Set-Up
7
B
F
G
E
Removing & Installing
the Bobbin Case
Installing Bobbin
in Bobbin Case
The bobbin case (B) is located
on the underside of the machine
beneath the presser foot (7).
1. Insert a threaded bobbin (A) into the
bobbin case (B) with thread coming off the
left side in a clockwise rotation.
Removing — Lift the spring loaded lever (E)
and pull the bobbin case out. With the lever
held open the bobbin is captive in the bobbin
case. Release the lever and the bobbin will
fall out.
Installing — Pull and hold the spring-loaded
lever outward (to keep the bobbin from falling
out) and push the case onto the axle of the
gib hook. The finger of the bobbin case (F)
should point upward.
If the lever (E) is held up until the bobbin
case is completely installed, the lever, when
released, will lock onto the axle and there will
be no clicking sound. If the lever is released
before the bobbin case is pushed completely
in place, there is a clicking sound when the
case is pushed all the way on. The finger of
the bobbin case will drop into the notch in the
hook’s retaining ring (G).
9
2. Hold the tail of the thread while pushing
the bobbin into the bobbin case.
3. Pull the thread through the slit (C) in the
edge of the bobbin case.
4. Continue pulling the thread under the
tension plate (D).
F
8
B
E
A
D
C
5. Snap thread into position under tension
plate and pull out about a 6 inch tail of
thread.
ABobbin
B Bobbin Case
CSlit
D Tension Plate
E Spring-loaded Lever
FFinger
G Retaining Ring
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10
Ultrafeed ® Guidebook: Ultrafeed® Set-Up
Using the Ultrafeed®
Picking Up Bobbin Thread
After the machine is threaded and the bobbin case (with bobbin) is installed,
pick up the bobbin thread as follows:
9
10
11
12
Ultrafeed® Sewing Machines arrive tuned and optimized for sewing heavy
materials like sailcloth and marine canvas. If you want to sew lighter, home
fabrics you will need to make adjustments to the machine, which are outlined
in the Home Sewing section (p. 18).
Starting to Sew
13
1. Plug the machine into an outlet.
2. Use the lift lever (13) to raise and lower the
presser foot onto the material.
3. The thread from the needle and the bobbin
should be behind the foot as you start to
sew. Hold them down with your finger.
1. Hold the needle thread loosely to the side
(9) and rotate the balance wheel toward
you until the needle moves down and then
back up.
2. As the needle nears its highest point,
pull the needle thread gently. The bobbin
thread should come up through the needle
hole, with the needle thread, in the form of
a loop (10).
3. Pass a screwdriver under the presser
foot from right to left to pull the thread out
away from the machine (11).
NOTE: If the bobbin thread does not
appear when the needle is lowered and
raised, check to make sure 5 to 6 inches
of bobbin thread is hanging loosely from
the bobbin case and repeat steps 1-3
again.
4. Completed set-up should look similar to
(12). Now you’re ready to sew!
11
C
A
B
4. To mark your starting position, you may
want to rotate the balance wheel towards
you until the needle is buried in the fabric.
5. Press the foot control pedal to begin
sewing and release the trapped threads
after the first few stitches. If the thread
ends are not held down for the first few
stitches, a rats nest at the beginning of
sewing may occur.
ARaise
BLower
C Pressure Regulating Thumb Screw
DO NOT operate the machine when threaded without material under the presser foot (and foot
lowered). The machine will most likely “lock up” and be inoperable until the thread jam is cleared.
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12
Ultrafeed ® Guidebook: Using the Ultrafeed®
Forward Feed
+6 mm
C
Longest
Forward
0 mm
Sewing in Reverse
B
A
DO NOT rotate the balance wheel in the
wrong direction. Always turn it towards you
(from the top) to avoid thread jams in the
lower mechanism.
+6 mm
Turning Corners
Longest
Reverse
Reverse Feed
Regulating Stitch Length
The EZ Set Stitch Length Plate (14) sets both
forward and reverse stitch length. To set the
stitch length, loosen the two thumb screws
(A), slide the posts up or down and tighten
the screws. The thumb screw stops (B)
restrict the movement of the Feed Regulator
Lever (C), which is spring loaded to always
rest against the upper stop.
13
Position the needle fully up or fully down and
push the stitch length lever all the way down.
Hold the lever down until the reverse sewing
is completed. The lever is spring loaded and
will return to its forward position when you
release it. When the machine is operating at
1/4-speed or faster, reverse can be engaged
on the fly.
First turn the balance wheel toward you until
the needle is at its lowest point. Then lift the
presser foot, turn the material to the new
direction (the needle acts as an axis), drop
the foot and start sewing in the new direction.
Switching from
Straight to Zigzag Stitch 
15
The stitch width adjustment lever controls
the stitch type as well as the width of your
zigzag stitch (15). When the lever is on “0” the
machine is in straight stitch. Moving the lever
to “1” produces a 1mm zigzag stitch and so
on through “5”.
DO NOT change the position of the stitch
width lever when the needle is in the fabric or
the needle may bend.
Straight Stitch
Needle Positioning 
DO NOT attempt to change sewing directions
when the machine is at rest with the needle
positioned mid-stroke. This will cause a
skipped stitch or needle deflection.
In straight stitch mode (stitch width
adjustment lever at “0”), the needle can be
moved left, right, or center (16). This is very
helpful when installing zippers where it is best
to have the needle as close to the zipper teeth
as possible. Gently push down on the lever
before moving it left, right or center. It may
also be helpful to move the balance wheel a
little while moving the lever.
Rotating the fabric while the machine is at
rest with the presser foot down may bend the
needle.
DO NOT change the needle positioning when
the needle is in the fabric or the needle may
bend.
 Applies to LSZ-1 Model Only
16
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14
Ultrafeed ® Guidebook: Using the Ultrafeed®
Thread Tension
Adjustment
17
Knots pulled to top:
1. Decrease upper tension
2. Increase bobbin case tension
Knots centered — PERFECT STITCH
Knots visible on bottom:
Tension adjustment refers to the
combination of tension on both the
upper thread and the bobbin thread.
The correct combination of thread tension (17)
results in a stitch that looks identical on both
sides of the material (i.e., the knots of the
stitches are pulled into the fabric and are no
more visible on the top than on the bottom).
The primary problem when using a heavy
thread is incorrect upper thread tension.
When stitch tension is a problem, it is usually
a consequence of too much or too little
tension on the upper thread.
Tension changes to the bobbin thread should
only be made when upper tension changes
alone do not solve stitch tension. In general,
bobbin tension requires just about a two
ounce drag on the thread (similar to what you
feel when pulling dental floss off a spool).
The Ultrafeed® has a thread
tensioning knob on the front that the
upper thread runs through (18).
18
The upper tension knob can be turned up
to five revolutions to compress a spring that
squeezes two disks together.
When the presser foot is lifted the upper
tension disks are pushed apart. This releases
the top thread tension so fabric can be
removed from under the machine foot without
fighting thread tension.
DO NOT lift the presser foot when the upper
tension knob is less than a 1/2 turn from
maximum (turned snugly clockwise).
If upper tension is tightened all the way down,
raising the presser foot may bend the lever
inside the machine that separates the disks,
preventing the disks from opening correctly.
1. Increase upper tension
2. Decrease bobbin case tension
15
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16
Ultrafeed ® Guidebook: Using the Ultrafeed®
19
20
21
22
A
Adjusting Presser Foot Tension
The amount of downward pressure put on the
fabric by the presser foot is controlled by the
Pressure Regulating Thumb Screw (A). This
screw compresses a long coil spring above
the presser foot. Turn the screw clockwise to
increase the downward foot pressure. Turn
the screw counterclockwise to decrease the
foot pressure.
1. For sewing heavy, hard-to-feed materials,
it is best to have very high pressure on
the foot for optimum feeding. For these
materials, tighten the screw until only 1/2" of
the screw’s threads are showing (19). When
sewing delicate or spongy materials, reduce
the foot pressure. Turn the thumb screw
until it comes free of the machine and then
rethread it about 3 complete rotations for the
lightest spring setting (20).
17
Home Sewing
The Ultrafeed® is a great sewing machine for those who enjoy crafting;
quilting; home, auto & RV upholstery; and general sewing.
Removing Material from
Under the Presser Foot
1. Stop the machine with the needle at its
upward most position (21).
2. Raise the lift lever.
3. Pull the material straight back to remove it
from under the foot (22). It may be helpful
to rock the balance wheel forward and
back to free the thread from the tension
assembly.
4. Cut the two threads to free the material,
leaving at least a three inch length of
thread coming out of the machine.
Several of the same characteristics that make this machine great for sail and canvas work also
make the machine suitable for upholstery fabrics and most home fabrics. However, as a heavyduty machine, the Ultrafeed® is not ideal for sewing very light and delicate fabrics like silk, light
sheers or chiffon.
Use this simple checklist before sewing light to moderate weight fabrics:
1. U se an appropriate thread.
Home sewing machine thread should be
used in clothing or general home sewing.
Nylon thread is often preferred for interior
upholstery.
2. S elect an appropriately sized needle.
Match the fabric and thread weight to the
needle size (p. 2).
3. D ecrease pressure on the foot.
Too much pressure, if sewing lighter
fabrics, can scuff the material.
Adjust the foot pressure by loosening the
pressure regulating thumb screw (p. 12,
13). If it comes out, just screw it back in
a few turns. See "Adjusting Presser Foot
Tension" (p. 17).
ecrease the upper thread tension
D
and, if necessary, increase the bobbin
tension (p. 15, 17).
Too much upper thread tension will cause
the fabric to pucker. When using light
weight thread it may also be necessary to
increase the bobbin tension if the spring is
not clamping down like it does on heavier
thread.
4. Check for clockwise
rotation of the thread spool.
When placing home sewing machine
spools on the thread post, be sure the
thread spool is turning in a clockwise
manner to ensure the post it rides on is
tightened, not loosened.
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18
Ultrafeed ® Guidebook: Using the Ultrafeed®
Welting & Cording Application
25
The standard presser foot on Ultrafeed® sewing machines includes a 1/4"
welting tunnel that makes installing 5/32" foam piping quick, easy, and more
accurate.
Put the welting assembly under the groove
so the cord is accommodated by the groove
(25). The groove under the foot works to keep
the bulk of the material outside the arm of the
machine.
If looking from the back at the upper presser foot, there is a groove (tunnel) under the foot just to
the right of the needle (23 & 24).
23
When sewing welting on an assembly, work
clockwise to ensure the bulk of the assembly
stays clear of the machine, i.e. out from under
the sewing machine arm (26).
24
26
> LS-1 welting tunnel in
presser foot (back view)
19
 If using the LSZ-1, first put the machine in
straight stitch and center the needle bar.
Make Your Own Welting,
Cording and Piping
For how-to instructions, tips and advice
on making and sewing with welting,
cording and piping visit www.sailrite.com
> LSZ-1 welting tunnel in
presser foot (back view)
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20
Ultrafeed® Maintenance
Lubrication
LS-1 Lubrication Points
27
Top side lubrication points
The machine was thoroughly oiled prior to shipment.
Oil all metal to metal working parts frequently!
Use only sewing machine oil.
After oiling, briefly sew with scrap material to prevent soiling your work.
For good maintenance of your machine, you should oil it at least: twice yearly,
before it is put in storage, or anytime the machine sounds like it is running
roughly.
Marine Use & Potential for Rust
If the machine will be used or stored in a harsh environment, lubricate the working parts
of the machine with regular sewing machine oil prior to storage and before each use.
We also recommend using Boeshield’s T-9, a paraffin based protectant, to protect
metal surfaces and control knobs. Use even on the painted surfaces, metal parts,
needle plates, and presser feet.
28
Right end lubrication points >
T-9 leaves a thin protective layer of wax. Use sparingly as a lubricant as wax buildup
can create gumming friction over time.
21
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22
Ultrafeed ® Guidebook: Ultrafeed® Maintenance
29
23
Left end and back side lubrication points
30
Underside lubrication points
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24
Ultrafeed ® Guidebook: Ultrafeed® Maintenance
LSZ-1 Lubrication Points
31
32
Top side lubrication points
Left end and back side lubrication points
33
25
Right end lubrication points >
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26
Ultrafeed ® Guidebook: Ultrafeed® Maintenance
34
Underside lubrication points
Troubleshooting the Ultrafeed®
The more we understand our machines, the better they work for us. Ultrafeed® Sewing
machines are actually rather simple, and adjustments can be easy if you take a little
time to get to know your machine. Use this next section as a guide to better understand
your Ultrafeed® and to help fine tune and resolve common sewing machine problems.
35
J
I
H
G
F
E
D
C
B
A
Thread Tension Doesn’t Release
If your thread won’t pull out of the top of the machine, even after you’ve raised the presser foot,
the core (I) of your upper tension assembly (35) might have pulled away from the machine. To fix
the tension, you will need to move the core closer to the machine.
1. Remove the left end cover (p. 49, 13) of
the machine, exposing the internal parts.
2. Using an Allen wrench, loosen the set
screw located directly behind the tension
assembly (p. 49, 12).
3. With the presser foot up, push the upper
tension assembly in until you feel the first
signs of resistance.
27
4. Check to make sure the tension disks
(E & F) are open and that the thread
moves smoothly.
5. Tighten the set screw.
6. Put the presser foot down to check that
the tension disks properly tighten. The
thread should not easily pull through.
7. Replace the cover.
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28
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
Inconsistent Stitch Tension
Clutch Will Not Disengage
If you notice that you are getting inconsistent stitch tension or if your thread looks loose and
sloppy near the tension assembly under operation, check your take up spring (p. 28, 35 H). If
the wire hook has broken off, you’ll need to replace the take-up spring. To do this, you’ll need to
disassemble the upper tension assembly. Keep track of how the parts are removed as they will
be replaced in the same manner (p. 28, 35).
If the clutch will not disengage, first remove the reverse threaded Posi-Pin nut (p. 61, 2) from the
balance wheel (6). Remove the balance wheel. Polish and lubricate the Posi-Pin bushing shaft (4).
Slide the balance wheel back on and screw the Posi-Pin nut (2) down.
Removing the Hook to Clean the Shuttle Race
Guide Shaft and Free Thread Jams
1. Pull the cover knob (A) straight off (wiggle
a bit if needed).
6. Spin the arm of the spring clockwise past
the slot in the core.
2. Unscrew and remove the threaded
knob (B).
7. While holding the spring arm in place,
slide the keyway washer (G) back onto the
core with the pip facing in, so the take-up
spring arm rests on the metal pip of the
washer.
Perform these steps with care:
8. Replace the first tension disk (F) with the
convex side facing out. Add the second
tension disk (E) with the concave side
facing out.
3. Turn each lever (36 A) one half turn away
from the retaining ring (B).
4. Pull the axle of the hook to remove
retaining ring (B) and hook (C).
9. Replace the spring holder (D) with the
concave side facing out and the spring
(C). Screw the threaded knob (B) back on
the post and add the cover knob (A).
5. Gently remove the accumulated lint and
thread from the retaining ring (B), hook
(C), and driver (D). Use a small brush to
clean the parts or blow out the debris.
3. Remove the big spring (C), the spring
holder (D), the two tension disks (E & F),
and the keyway washer with pip (G).
4. Remove the old take-up spring (H) by
pulling it straight out.
5. Slide the new take-up spring over the
core post (I) so that the pip on the back
faces in towards the machine and the
straight arm of the spring faces down
(approximately at a 6 o’clock position).
Push the spring in all the way.
1. Move the needle to its highest point by
turning the balance wheel toward you.
2. Remove the bobbin case/bobbin.
6. Replace hook (C) opposite driver (D). The
hook just rests in place. Be sure the axle
is facing out.
7. Replace retaining ring (B) so that both
pins are under the black levers (A) when
turned. The polished side of the retaining
ring should be facing out.
8. Replace the bobbin and bobbin case
before beginning to sew.
36
C
D
B
A
29
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30
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
Skipped Stitches
If your machine is skipping stitches, zigzag stitches will look like a straight stitch on
either the right or left side with proper zigzag stitches being formed only occasionally.
Straight stitches will have stitch lengths that look exceptionally long at times.
A skipped stitch means the gib hook is not catching the thread consistently.
37
Burred Area
B
Burred Area
A
There are a number of causes for skipped stitches.
Start with Step 1 and stop as soon as the problem is resolved.
1. Incorrectly Installed, Bent, or Dirty Needle
A bent needle will cause skipped stitches because the loop is not where the gib hook
(p. 55, 16) “expects” it to be. Adhesive residue on the needle will cause the thread to stick
to the needle instead of moving through the eye to form a loop.
Make sure your needle is installed correctly (p. 4), is not bent or damaged, and is free of any
residue from sewing adhesive material. Fouled needles may be cleaned with rubbing alcohol.
Bent or damaged needles must be replaced.
2. Not Enough Foot Pressure
Heavy, closely-woven materials like sailcloth and canvas can make the withdrawal of the
needle from the fabric difficult.
If the presser foot is being lifted as the needle comes out of the cloth the loop that the needle
forms will be too small.
Increase the downward pressure on the presser foot by tightening the pressure regulating
thumb screw (p. 12, 13).
31
> Gib Hook
> Retaining Ring Cap Spring
3. Burred Gib Hook or Retaining Ring Cap Spring (37)
A needle strike to the gib hook (A) or the edge of the retaining ring cap spring’s “triangular”
opening (B) may result in a burr which can cause the thread to snag as it pulls through.
Remove any burrs by polishing them with emery paper or a fine file. If badly damaged,
replace with a new retaining ring cap spring (#1603).
4. Machine Has Gone Out of Timing
If skipped stitches continue, the machine has probably gone out of timing. The timing is
checked by determining the relationship of the needle to the gib hook point.
To reset the timing on your Ultrafeed®, follow the steps outlined on p. 40 "Ultrafeed® Timing".
www.sailrite.com
32
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
Thread Issues
Thread is shredding, balling or breaking:
There are a number of causes for breaking thread. Start with Step 1 and stop as soon
as the problem is resolved.
1. Incorrectly Installed or Damaged Needle
Make sure your needle is installed correctly (p. 4, 1 & 2). Carefully inspect the needle for
burrs, warping or damage to the point that may be causing needle deflection and shredding
the thread. Bent or damaged needles must be replaced.
2. Burred Gib Hook or Retaining Ring Cap Spring
A needle strike to the gib hook or the edge of the retaining ring cap spring’s “triangular”
opening may result in a burr which can cause the thread to snag as it pulls through
(p. 32, 37 A & B). Remove any burrs by polishing them with emery paper or a fine file.
If badly damaged, replace with a new retaining ring cap spring (#1603).
3. Incompatible Needle Size & Thread Weight
If the thread is too thick for the needle it will not pass through the needle eye and form a
loop and will instead ball at the needle. Check the compatibility of the needle size and thread
weight (p. 2).
4. Machine Has Gone Out of Timing
If the machine is out of timing it may cause the gib hook point to cut or shred the thread.
To reset the timing on your Ultrafeed®, follow the steps outlined on p. 40 "Ultrafeed® Timing".
33
There are thread loops on the underside of the fabric:
A tangle on the bottom side of the fabric means there is not enough upper tension.
More than likely, the thread is not being pulled snugly between the tension disks
(p. 28, 35 E & F) on the upper tension assembly or is not between them at all.
1. Lift the presser foot (to push the two tension disks apart) (p. 12, 13)
2. Firmly pull the thread against the center shaft between the disks.
3. Drop the presser foot. The disks should close on the thread creating plenty of tension.
Gently pull on the thread to feel the tension.
4. If this did not solve the problem, pull the cover knob off the upper tension assembly and turn
the knob found underneath to the point where its outer surface is flush with the end of the
tension post. Then repeat steps 1–3.
Thread loops could also be caused by a burr on the retaining ring cap spring
(p. 32, 37 B). Remove any burrs by polishing them with emery paper or a fine file. If badly
damaged, replace with a new retaining ring cap spring (#1603).
Thread pulls out of the needle eye when starting to sew:
Confirm that the needle eye is threaded from left to right (p. 7, 6 H & I). Then pull out a longer
thread tail and trap it with your finger. Release the thread tail after the first few stitches.
A rat’s nest forms in the first few inches of sewing and then clears up:
Eliminate this formation by trapping the thread tails from the needle and the bobbin as you start
to sew.
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34
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
When stopping to turn a corner, the machine skips a stitch even with the
needle buried:
Bury only the needle tip in the cloth. This allows the machine to create the appropriately sized
loop for the gib hook to pickup. See p. 13 for helpful advice on turning corners.
When removing fabric from under the machine it pulls hard and three
strands of thread come up through the throat plate:
Typically this happens when fabric is being removed during the middle of a stitch. The hook
under the machine still has a loop of thread around it.
Before removing fabric from under the machine, manually turn the machine forward until the takeup arm has just passed the top of its travel. This allows the hook to release the thread loop and
proper upper tension to be applied to finish the stitch (see p. 17).
Using Profilen Thread (PFTE)
Sewing with a lifetime (PFTE) thread can be difficult and frustrating at times. Try making a few
easy adjustments to your Ultrafeed® to improve the stitch quality when using Profilen. These are
general guidelines, feel free to experiment with these adjustments to fine tune your Ultrafeed®.
Stitches are skipped in straight or zigzag operation:
1. Mount the thread spool horizontally. Every time the thread pulls off the top of the cone,
a twist is put in the thread. Eventually, these twists add up and an erratic loop forms at the
hook. When the hook misses catching the thread loop, the machine skips a stitch. Make a
roller out of a dowel rod or an old coat hanger that will support the spool horizontally and
mount the spool on it. Pulling the thread off this way will reduce twists and kinks.
2. Further reduce the chance of twists and kinks in your thread by running it through all three
holes in the three hole thread guide (p. 50, 21) when threading the machine.
3. Use a #14 or #16 needle. PTFE thread is very slippery and often requires the use of a
smaller needle. If you are using a needle that is too large, the needle shaft cannot hold the
slippery thread firmly enough against the fabric to form a proper loop. This prevents the hook
from catching the thread loop and forming a stitch.
4. Lower the needle by 1/16". Lowering the needle has a tendency to increase the size of the
thread loop. Adjust the needle only if a smaller needle does not help.
35
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36
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
Needle Issues
Bobbin Winding Issues
The needle is breaking:
The bobbin is not filling evenly, either too much thread on the top or
bottom:
Needles often break if left in the fabric while toggling the stitch width or alternating between left,
center, and right positions (LSZ-1 only). Raise the needle out of the fabric before making these
changes.
Needles will also snap if there are jams or tangles in the bobbin. Before installing your bobbin
make sure it is wound correctly and unwinds smoothly.
The needle hits the needle throat plate when reversing sewing directions:
This is most likely caused by a bent needle. To avoid bending needles when changing sewing
direction, stop the machine with the needle positioned either at the top or bottom of its stroke.
When the needle is completely up, the foot can move the material but cannot bend the needle.
When the needle is completely down, the outer portion of the walking presser foot is up and
cannot move the fabric which also would bend the needle.
Refer to p. 5 on "Winding Bobbins". Locate the bobbin tensioner (p. 5, 3 C) and loosen the screw
just under the tensioner on the front of the machine. Move the tensioner down if the bobbin is
filling with too much thread on the top. Move the tensioner up if there is too much thread on the
bottom. Tighten the screw after correct positioning.
The bobbin winder stops before the bobbin is full or after the bobbin has
too much thread:
There is a bobbin stop (p. 49, 3) right next to the bobbin winder. It disengages the bobbin winder
when a certain thread level is reached. Simply loosen the screw found on top of the black lobe
and turn the stop to change the thread level. Turning it will either push the bobbin away earlier or
later. Tighten the screw once the correct position is found.
The balance wheel rotates, but the needle does not penetrate the fabric:
The Posi-Pin clutch may slip if the pin is not pushed all the way into the bushing hole that locks
the bushing to the balance wheel or if the bushing itself is loose.
1. Make sure the spring-pin is properly inserted.
2. If slipping still occurs, remove the Posi-Pin nut (p. 61, 2), pull out the spring-pin (1, 3 & 5),
and slide the balance wheel off the bushing.
3. Use a 2.5 mm Allen wrench to tighten the two set screws (34) that fasten the bushing to the
machine’s upper shaft, then reinstall the balance wheel and check for proper operation.
37
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38
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
Belt Issues
Ultrafeed® Timing
The belts slip or come off the pulleys:
The timing of your machine is determined by the relationship of the needle to the gib
hook. The gib hook picks up the upper thread at the needle and carries it down around
the bottom of the bobbin case where the upper thread loop is pulled tight by the take
up arm above the needle bar.
The sewing machine belts may require tension adjustment. The longer belt should be tensioned
to deflect 1/4" when pressed down using a little pressure by your finger (38). Tension on the belt
can be adjusted by loosening the bolt (A) located directly below the balance wheel. This bolt
attaches the idler pulley (B) to the machine. Move the idler pulley up or down to properly tension
the belt and, then, tighten the bolt.
The short belt should appear to be much looser, but its deflection should also be about 1/4" (39).
This belt should not require adjustment unless an adjustment to the longer belt has been made. If
adjustment is ever required, slide the idler pulley forward and backward in its slotted bracket. The
pulley shaft (p. 61, 10) of the idler pulley is pressed flat at its outer end so that it can be rotated
(loosened) with a small wrench. After loosening the shaft, the pulley may be moved to re-tension
the belt. Tighten the shaft to complete the adjustment.
38
A
39
39
B
Starting on p. 41, follow these steps to adjust the timing on your Ultrafeed®:
About the Class 15
Shuttle Hook System
40
The Ultrafeed® has a class 15 shuttle hook
system. In this system the gib hook oscillates
back and forth around the bobbin case in half
turns (40) carrying the upper thread around
the bottom of the bobbin case. Once this is
completed, the hook reverses direction and
returns to its original location. This movement
is geared by a simple yoke and cam
arrangement on the top shaft of the machine.
It is a relatively simple design but is both
reliable and satisfactory for canvas work.
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40
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
Check the Needle Bar Height
1. Remove the left end cover of the sewing
machine as shown (41).
2. Manually lower the needle bar to its lowest
position by turning the balance wheel
toward you.
3. We mark the proper height of the needle
bar for your machine by putting a small
scratch on the needle bar (A). Check to
see if the mark is level with the top surface
of the upper needle bar guide.
You can also determine the proper height
by measuring the distance between the
top of the needle eye and the gib hook
when the gib hook is directly behind the
needle and the needle is on its way up.
The distance should measure between 0
and 1/32" (B).
If aligned properly, the needle bar is set
correctly. If not, continue on to adjust
the needle bar height.
41
4. Manually operate the machine to move
the needle bar to the bottom of its stroke
(all the way down). Unlock the needle
bar from the drive collar by loosening
the set screw located either in the front
or the side of the pillow block (C). If the
screw is in the side of the pillow block,
it can be accessed through a hole in the
machine casting (D). Use a 1/8" flat blade
screwdriver to loosen. Do not use the
screwdriver that comes with the machine,
it is not a proper fit.
5. With the needle bar at the bottom of its
stroke, reposition the needle bar so the
mark lines up with the top surface of the
upper needle bar guide. Gently twist the
needle bar up or down to position the
mark making sure the screw that secures
the needle is facing the inside of the
sewing machine arm. Tighten the drive
collar set screw.
If your Ultrafeed® is still not performing
properly after adjusting the needle bar
height, proceed to check the rotational
timing.
41
D
A
≈ 5/8"
C
B
0–1/32"
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42
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
42
A
43
B
Check the Rotational
Positioning of the Shuttle
Race Guide Shaft
44
Before making any adjustments to the leftright positioning of the shuttle assembly,
check the rotational positioning of the shuttle
race guide shaft.
1. Remove the needle plate (p. 49, 18)
and feed dog (p. 57, 17 or 19)
Check the Rotational Timing of the Shuttle Gib Hook
The shuttle gib hook (p. 55, 16) is driven by the shuttle driver (15). To change the rotation of the
hook, the driver must be repositioned on the lower shaft (14).
1. Turn the balance wheel so the gib
hook point is at its furthest position
counterclockwise (42).
2. Measure the distance between the gib
hook point and the needle. The driver
is correctly positioned when the point is
between 1/8" and 3/16" counterclockwise
of the needle (A).
If spaced properly, the driver is set
correctly. If not, continue on to adjust
the driver.
43
3. The driver is secured to the lower shaft
with two set screws (43). Loosen the
screws (B) and gently twist the shuttle
driver. Keep the driver from sliding left or
right on the shaft. If the fit is tight, carefully
use a screwdriver as leverage.
After adjusting the rotational timing
of the gib hook, you may need to
adjust the rotational positioning of the
shuttle race guide shaft or the left-right
positioning of the shuttle gib hook.
C
2. Remove the bobbin case and hook,
re-install the retaining ring.
3. Rotate the balance wheel until the needle
enters the shuttle (44).
If positioned properly, the needle is
centered in the “triangular” opening of
the retaining ring cap spring from front
to back (C).
5. Twist the shuttle race guide shaft carefully
without moving it left or right. If it will not
move, loosen the compressible timing
clamp screw a little more.
If not, you'll need to adjust the
rotational positioning of the shuttle
race guide shaft.
6. Verify that the needle is now positioned
correctly within the retaining ring cap
spring.
4. Loosen the compressible timing clamp
screw (p. 46, 46 D) just a little.
7. Tighten the compressible timing clamp
screw.
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44
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
45
A
Check the Left-Right Positioning
of the Shuttle Gib Hook
Adjusting the Left-Right Positioning of the Shuttle Gib Hook 
If the shuttle assembly and lower shaft have
slipped left or right of the factory setting, the gib
hook will not be in position to catch the loop.
2. Make a mark on the cast iron bearing
surface next to the large oil hole
(46 B) in the shuttle race guide shaft (C).
If the shaft should accidentally rotate,
realign the mark with the oil hole.
1. Re-install the gib hook (p. 30)
2. Make sure you have a #20 needle
installed.
3. Set the machine in straight stitch, center
the needle (LSZ-1 only), and grab a
flashlight.
1. Set the machine to straight stitch.
3. Loosen slightly the compressible timing
clamp screw (D) on the compressible
timing clamp that drives the entire
assembly back and forth with the zigzag
movement of the needle. Incrementally
loosen the screw until light taps will
move the shuttle assembly (E) in either
direction.
4. Carefully move the assembly to position
the hook as close to the needle as
possible without deflecting (p. 45, 45).
5. With the mark on the bearing surface and
oil hole aligned, tighten the compressible
timing clamp screw (D).
>F
or the sake of clarity (45) shows the machine
without the retaining ring installed. While this
makes it easier to see the timing, the hook
must be held in place with light finger pressure
to keep it from falling out of the shuttle
assembly when rotating the balance wheel.
5. Looking from the top down in to the
machine (45), slowly rotate the balance
wheel. As the gib hook swings past the
needle, the hook should be as close as
possible to the right side of the needle
without deflecting it (A).
46
D
4. Remove the presser foot, needle plate and
feed dog.
B
E
C
D
If the gap between the needle and the
hook is too large, the hook must be
moved to the left to close the gap.
If the needle is being deflected by the
hook, then the hook must be moved to
the right.
45
 Applies to LSZ-1 Model Only
www.sailrite.com
46
Ultrafeed ® Guidebook: Troubleshooting the Ultrafeed®
B
Adjusting the Left-Right Positioning of the Shuttle Gib Hook 
1. Make a mark on the shuttle race guide
shaft (p. 48, 47 A) where the halves of the
compressible clamp meet (B). If the shaft
should accidentally rotate, realign the
mark with the clamp gap.
To move the hook to the left —
2. Incrementally loosen the compressible
timing clamp screw (C) on the
compressible timing clamp until light taps
will move the shuttle assembly. Carefully
move the shuttle assembly (D) to the left.
3. Move the assembly to position the hook
as close to the needle as possible without
deflecting (p. 45, 45).
4. With the clamp gap (B) and reference
mark (A) aligned, hold the clamp to the
far left firmly against the cast iron foot and
tighten its screw (C).
5. Holding the gib hook in place, loosen the
right collar (E) and move it as far right as
possible without touching the frame.
6. Tighten the two collar screws. There
should be practically no side-to-side play
in the center shaft.
C
D
47
A
C
To move the hook to the right —
7. Loosen the two screws in the right collar
(E) and move it to the left on its shaft and
move the shuttle assembly (D) to the right.
E
8. Move the assembly to position the hook
as close to the needle as possible without
deflecting (p. 45, 45).
9. Holding the correct position of the shaft
move the right collar (E) as far right as
possible without touching the frame and
tighten its screws.
10.Holding the gib hook in place, loosen the
compressible timing clamp screw and
move the timing clamp all the way to the
left.
11.With the clamp gap (B) and reference
mark (A) aligned, tighten the clamp screw
(C). There should be practically no sideto-side play in the shaft.
Hook/Driver Gap
48
Oscillating hook sewing machines have loose
tolerances between the Shuttle Gib Hook
and the Shuttle Driver. This play between the
parts is intentional and allows the Ultrafeed
to sew heavier denier threads than many
larger rotary hook machines. The typical gap
between parts is 0.04" (48).
Gap
47
 Applies to LS-1 Model Only
www.sailrite.com
48
GROUP 1: Construction External Group 
4
3
9
8
26
KEYPA R T N A M E
2
1
1
7
25
6
34
24
33
32
23
12
17
36
Top Plate Screw 4
Bobbin Winder Stopper Screw 5
6
17
7
17
8
27
9
5
38
W047Z
Top Plate 2
3
37
PA R T # B071
Bobbin Winder Stopper Small Plate Cover Screw Bobbin Winder Assembly Nut Bobbin Winder Assembly Spool Pin 10
16
14
35
13
21
11
14
39
18
22
components may
be purchased
separately
E070
15 EZ Set Stitch Length Plate C097
105511
18 Needle Plate (5mm) W032Z
20 Shuttle Race Slide A048-B
23 Bobbin Winder 24 Screw 27 Bobbin Winder Ring 120181
29 Tension Release Pin W184-2
26 Top Plate Set Screw 28 Thread Take-Up Spring
(included in 22) 30 Shuttle Race Slide Spring E072
31 Shuttle Race Slide Spring Screw 34 Set Screw 103263
22 Upper Tension Assembly
(includes 28) 103253
N/A
16 Stitch Length Plate Screw 17 Bobbin Winder Set Screw 25 Thread Guard Screw 149
W048Z
14 Screw PA R T #
32 Straight Stitch Position Guide 103640
5332
A049
A050
W001Z
33 Take Up Arm Guard 102626
35 Left End Plate Washer 103252
37 Bobbin Winder Assembly
Screw 103255
36 L, R, C Lever Stop 38 Hinge Pin Set Screw A012
103254
120061
B010
A052
21 Three Hole Thread Guide 29
19
20
28
E070-1
12 Set Screw 19 Needle Plate Screw 12
100577
N/A
13 Left End Plate 12
E066-2
W047-1Z
10 Arm Body 11 Bed 15
E066
KEY PA R T N A M E
W029
8511
W030Z
100576 or A036
30
49
31
 Applies to LSZ-1 Model Only
www.sailrite.com
50
9
GROUP 1: Construction External Group 
8
4
3
KEYPA R T N A M E
2
23
1
1
2
33
6
7
29
5
12
4
5
32
31
22
3
33
6
7
34
28
8
9
Bobbin Winder Stopper Bobbin Winder Stopper Screw Small Plate Cover Screw Bobbin Winder Assembly Nut Bobbin Winder Assembly Spool Pin 11 Bed 12 Set Screw 10
16
12
14 30
Top Plate Screw 10 Arm Body 15
35
Top Plate 13 Left End Plate 14 Screw 15 EZ Set Stitch Length Plate 13
20
11
12
14 30
18
19
17 Needle Plate (5mm) 18 Needle Plate Screw 24
25
17
16 Stitch Length Plate Screw 19 Shuttle Race Slide 21
20 Three Hole Thread Guide components may
be purchased
separately
21 Upper Tension Assembly
(includes 24) 22 Thread Guard Screw 23 Top Plate Set Screw PA R T # W047
B071
E066
E066-2
W047-1
100577
E070-1
E070
149
N/A
N/A
103640
W048
C097
105511
KEY PA R T N A M E
PA R T #
24 Thread Take-Up Spring
(included in 21) 25 Tension Release Pin 26 Shuttle Race Slide Spring 27 Shuttle Race Slide Spring
Screw 5332
W184-2
A049
A050
28 Take Up Arm Guard 102626
30 Left End Plate Washer 103252
29 Set Screw 31 Bobbin Winder Assembly
Screw 32 Bobbin Winder 33 Bobbin Winder Set Screw 34 Bobbin Winder Ring 35 Hinge Pin Set Screw
A012
103255
W030
B010
120181
120061
103263
W032
A052
120346
W029
8511
103253
E072
26
51
27
 Applies to LS-1 Model Only
www.sailrite.com
52
GROUP 2: Sewing Transmission Group
17
KEYPA R T N A M E
1
10
4
18
9
24
6
19
32
6
9
8
50
39
3
5

50
48
51
21
4
34
50
31
16
36
35
54
41
8
9
11
12
38
13
15
46
56
5
14
4
25
Arm Shaft Bushing 4
10
42
47
27
15
3
7
7
14
21
43
44
6
Arm Shaft 6
53
52
20
33
1
2
2
40
16
17
18
26
37
19
20
11
30
45
11
22
55
23
28
27
49
53
29
12
13
11
PA R T # 21
22
23
24
25
26
27
28
E053
Feed Cam B007
Set Screw A012
B051
Thread Take-Up Lever Cam Thread Take-Up Assembly Set Screw Thread Take-Up Lever Cam Screw Crank Rod Lever Cam Follower Crank Rod Lever Cam Follower
Adjust Nut Crank Rod Lever Cam Follower Bolt Thread Take-Up Assembly B048
A029
103256
W028-4
W028-2
W028-1
E020
Needle Bar Connecting Rod Set
Screw - Reverse Thread E020-2
Needle Bar Connecting Stud  A042S
Needle Bar Connecting Rod Needle Bar Connecting Stud  Needle Screw Presser Regulating Thumb Screw B018
A042
A092
A031
Presser Regulating Thumb Screw
Socket W010
Needle Bar Support B016
Presser Bar Spring A032
D097
Needle Bar Set Screw Zigzag Connecting Rod W015
Needle Bar W066
Needle Bar Connecting Joint Pin Needle Thread Guide Needle #20 (135X17) Presser Foot Screw Inside Presser Foot   Applies to LSZ-1 Model Only
B099
W067
7010
A036
W012
KEY PA R T N A M E
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
PA R T #
Inside Presser Foot  W012Z
Presser Bar A035-1
Presser Bar Lower Bushing B028
Presser Bar Bracket W039
Presser Bar Feed Actuator Pivot
Screw 103257
Tension Release Lever Drag Link W043
Tension Release Lever Drag Link Set
Pin D020
Tension Release Lever W045
Tension Release Lever Set Screw B046
Zigzag Drive Gear Cam  W016Z
Presser Bar Actuator Cam W065
Helical Gear  W000Z
Needle Displacement Regulator
Assembly  W003Z
Block Slide  W004Z
Zigzag Connecting Link and Screws  W005Z
Collar For Zigzag Connecting Link  W006Z
Zigzag Vertical Shaft  W007Z
Snap Ring For Zigzag Vertical Shaft  W008Z
L, R, C Lever Cap  W003ZC
L, R, C Lever  W003ZL
Needle Guard
(220-240 Volt Ultrafeed® Only) 102627
Set Screw W052-1
Pillow Block Screw  103258
Screw B103US
L, R, C Lever Pin 103270
Screw 103264
Needle Crank Arm 103269
Connecting Rod Set Base  W016
 Applies to LS-1 Model Only
www.sailrite.com
54
19
GROUP 3: Shuttle Transmission Group
KEYPA R T N A M E
PA R T # 1
2
3
1
14
28
21
28
4
5
7
6
2
15
25
16
26
8
7
11
8
7
17
9
18
6
7
12
5
4
27
Crank Connecting Rod
Set Nut Oscillating Shaft Crank Set Pin Set Screw Oscillating Shaft Crank With
Slide Block 10 Compressible Timing Clamp 11 Compressible Timing Clamp Pin 14 Lower Shaft 23
16 Shuttle Gib Hook 24
23
22
A027A
23 Retaining Ring Clip Spring 103273
25 Retaining Ring for Ultrafeed® 102241
A024
A018
27 Screw  28 Retaining Ring Screw 103259
103264
102496
B155
A084
B153
B170
B172
W172
9601
19 Screw B139-2
 Applies to LSZ-1 Model Only
26 Timing Clamp Pin Screw 103274
B177
123100
20 Zigzag Shuttle Drive
Assembly  24 Retaining Ring Clip Screw 123011
103640
17 Bobbin 18 Bobbin Case Assembly 22 Retaining Ring Clip Set 1603
B179
Lower Shaft Collar 13 Shuttle Race Guide Shaft 21 Retaining Ring Cap Spring A023
Oscillating Shaft PA R T #
B139
A027B
Oscillating Shaft Set
Screw & Nut 15 Shuttle Driver 20
55
9
Crank Connecting Rod
Set Screw 12 Compressible Timing
Clamp Screw 
24
4
3
10
13
7
LS-1 has a second collar
Crank Connecting Rod KEY PA R T N A M E
1232
W002Z
 Applies to LS-1 Model Only
www.sailrite.com
56
GROUP 4: Feed Transmission Group
KEYPA R T N A M E
PA R T # 8
Feed Regulator Lever Nut 5
7
6
10
25
7
8
26
3
3
21
11
1
18
27
12
2
19 LS-1
3
4
6
5
Feed Regulator Thumb Nut 2
9
4
1
13
9
Feed Regulator Lever 24
20
15
11
W107
Feed Regulator W106
Feed Regulator Spring Feed Regulator Screw Feed Regulator Pivot Screw Feed Connection Slide Block Feed Connection Slide
Block Stud 10 Forked Rod 22
16
11
B103U
27 Forked Rod Support
Spring Screw A067
B103US
B010
W108
A069B
A071B
14 Feed Rock Shaft 15 Feed Bar Center Screw & Nut A071A
A076
A075
W011Z
A078
19 Feed Dog  W011
20 Driving Crank Guide Nut 21 Driving Crank Guide Screw 24
26 Forked Rod Support Spring 25 Feed Regulator Wavy Washer W046
13 Feed Rock Shaft Crank 22 Feed Lifting Rock Shaft B139-2
A023
17 Feed Dog  23
24 Screw B103
11 Oscillating Shaft Set Screw
and Nut 18 Feed Dog Screw 15
PA R T #
A069A
16 Feed Bar 14
W105
A053B-2
12 Driving Crank 17 LSZ-1
W109
KEY PA R T N A M E
23 Feed Lifting Rock Shaft Crank W046-1
A061
A072
A073
11
57
 Applies to LSZ-1 Model Only
 Applies to LS-1 Model Only
www.sailrite.com
58
44
GROUP 5: Driving & Reversing Mechanism Group
39
40
1
37
2
35
3
40
42
39
36
34
30 38
33
8
9
W042
Presser Foot Lift Lever Hinge
Screw W042-3
Upper Lift Bar Screw W042-2
Lift Bar W026
W042-1
Spacer W026-1
Lift Bar Guide Screw W018
Presser Bar Track Presser Bar Track Hinge Screw W018-1
W020
Rear Presser Bar Bracket 10 Set Screw A029
11 Presser Bar Track Guide Screw W018-2
W018-3
13 Presser Bar Load Spring (Rear) W019-1
14 Rear Presser Bar 15 Outside Presser Foot Bracket 12
16 Screw 19 Presser Bar Actuator 23
16
35
PA R T #
24 Screw C097
25 Presser Bar Feed Rod W024-1
28 Lift Crank Rod Bearing Plate W023
27 Bearing Bracket Bushing 29 Rocker End Set Ring 30 Presser Bar Actuator Rocker 31 Presser Bar Actuator
Feed Rocker 35 Screw W033
W053
103640
A036 or 100576
B010
38 Lock Spacer W013
40 Lock Nut W024
W052
W035
33 Crank Rod 34 Set Screw W021
W034
32 Crank Rod Rocker W019
W017
W036
26 Presser Bar Actuator Spacer 103272
37 Guide Screw W046-2
39 Washer W046-4
W046-3
41 Presser Bar Actuator Pivot
Screw A061-B
103257
20 Presser Bar Actuator
Feed Screw W020-1
42 Presser Foot Lift Lever Stop Nut 103267
22 End Plate Set Screw W041-1
44 Crank Rod Bearing Set Base
Screw 21 End Plate 15
KEY PA R T N A M E
36 Presser Bar Actuator Rocker
Screw W013Z
18 Outside Presser Foot  14
41
4
Presser Foot Lift Lever 17 Outside Presser Foot  25
20
3
7
9
19
1
12 Presser Bar Track Feed Stud 13
24
43
6
31
8
28
5
10
7
59
10
34
32 29
10
22
26
27
PA R T # 2
34
11
21
6
10
38
5
4
KEYPA R T N A M E
28
44
W041
23 Presser Foot Bracket Limiter W014
43 Crank Rod Bearing Set Base W025
W025-1
18 LS-1
17 LSZ-1
 Applies to LSZ-1 Model Only
 Applies to LS-1 Model Only
www.sailrite.com
60
GROUP 6: Electric Power & Dynamic Transmission
KEYPA R T N A M E
PA R T # KEY PA R T N A M E
PA R T #
1
Posi-Pin Knob For Shaft 100540
23 Motor Bracket Washer 103266
3
Posi-Pin Spring 100539
25 Motor
31
22
28
21
2
19
29
4
20
23 24
22
5
19
6
23 24
25
7
30
27
18
8
26
3
9
7
1
Posi-Pin Quick Release
Shaft 3/16" 100538
100181
Power Plus Flywheel Cogged Sewing Machine
Timing Belt 18.6" 56535
Cogged Sewing Machine
Timing Belt 8" 56539
D116
E5 Ring W061-1
11 Idler Pulley W061-A
12 Idler Pulley Washer 2
11
8
W061-6
13 Idler Pulley Set Nut W061-2
14 Pulley Bracket 9
15 Motor Bracket Washer 14 12
34
17 Motor Bracket Bolt 10
33
17
34
13
15
18 Belt Cover 19 Belt Cover Screw 20 Motor Base  16
32
21 Motor Base  22 Motor Base Screw  Applies to LSZ-1 Model Only
24 Motor Bracket Nut 26 Motor Pulley 102731 (220-240V)
W062-1
27 Set Screw W052-1
28 Bracket 29 Top Bracket Mount Screw 30 Bottom Bracket Mount Screw 31 Motor Plug Screw & Washer 32 Foot Control 110V with
Grounded Wiring 33 Foot Control 220-240V with
Grounded Wiring 34 Set Screw 103268
102630 (110V)
102712
103260
103261
103262
102594
102730
713100
W059
16 Motor Bracket Lock Washer 4
61
100537
Posi-Pin Wheel Bushing 10 Idler Pulley Shaft 5
6
Posi-Pin Nut - Reverse Thread 100536
LT-2M-4
LT-2M-3
LT-2M-2
W050BL
100576 or A036
W049Z
W049
W049-1
 Applies to LS-1 Model Only
www.sailrite.com
62
Specifications
P OW ER
63
/10th Hp, 110V US/220-240V EU, AC Motor, 1.5 Amp
1
US/0.7 Amp EU, 50/60 Hz
M A X . S E W IN G S PE E D
500 (Stitches/Minute)
SH U T T L E
Oscillating (Cam/Rocker Arm Driven)
M A X . S T R AIG H T
S T I TC H L E N GT H
6 mm
N E E DL E BA R S T R O K E
30 mm  / 34mm 
N E E DL E SYS T E M
135 x 17, 135 x 16
BE D S I Z E
14.5" x 7"
U N D E R AR M S PACE
7" x 4.5"
PR E S S E R FO OT L IF T
3/8"
BO BBI N S I Z E
Class 15 / Style A (20.5 mm Dia. x 10.8 mm H)
N E E DL E S I Z E R A N G E
#10–#22
T H R E AD R AN G E
Home Sizes to V-92
H E A D W E IG H T
35 lbs.
 Applies to LSZ-1 Model Only  Applies to LS-1 Model Only
2-Year
Li m ite d War ra nt y
All parts and labor are fully
guaranteed for 2 years by Sailrite.
We are proud to provide you with
everything you need to successfully
maintain and repair your Ultrafeed®.
Should you choose to return your
machine for repairs, you will be
responsible for delivery both ways.
PLEASE NOTE:
Damage due to improper use or neglect, impact
damage, and normal wear from use of the sewing
machine as well as sacrificial components and notions
(needles, retaining ring cap spring, and gib hook) are
not covered under this warranty.
www.sailrite.com
64
Sailrite.com
Equipping you to sew at home & on the water
Copyright ©2016
103280*1
Guidebook for Sailrite Ultrafeed LS-1 & LSZ-1
Qty: 1
Ultrafeed ® PATENTED TECHNOLOGY Patents #6499415 • #7438009
Version V3-1
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