JUKI LH-3500 Series User manual

ENGLISH
LH-3500 Series
INSTRUCTION MANUAL

i
CONTENTS
1. SPECIFICATIONS............................................................................................................ 1
2. NAME OF EACH COMPONENT ..................................................................................... 3
3. INSTALLATION................................................................................................................ 4
3-1. Caution at the time of set-up ................................................................................................................................ 4
3-2. Installation of the sewing machine ...................................................................................................................... 5
3-3. Adjusting the height of the knee lifter ................................................................................................................. 7
3-4. Installation of thread stand................................................................................................................................... 7
4. PREPARATION OF THE SEWING MACHINE ................................................................8
4-1. Method of lubrication ............................................................................................................................................ 8
4-2. Lubrication to the oil tank..................................................................................................................................... 9
4-3. Draining of oil from the oil tank ......................................................................................................................... 10
4-4. Adjusting the amount of oil in the hook ............................................................................................................ 10
4-5. Oil in the feed box ............................................................................................................................................... 12
4-6. Applying grease................................................................................................................................................... 13
4-7. Installing the belt cover and the bobbin thread winder ................................................................................... 16
4-8. Attaching the needles ......................................................................................................................................... 16
4-9. How to take out the bobbin case ....................................................................................................................... 17
4-10. Insertlng a bobbin in a bobbin case ................................................................................................................ 17
4-11. Threading the machine head ............................................................................................................................ 18
4-12. Thread tension................................................................................................................................................... 19
4-13. Thread take-up spring....................................................................................................................................... 20
4-14. Adjusting the stitch length ............................................................................................................................... 21
4-15. Needle-to-hook relation .................................................................................................................................... 21
4-16. Adjusting the needle stop position.................................................................................................................. 23
4-17. Pedal pressure and pedal stroke ..................................................................................................................... 24
4-18. Adjustment of the pedal.................................................................................................................................... 24
5. OPERATION OF THE SEWING MACHINE .................................................................. 25
5-1. Pedal Operation ................................................................................................................................................... 25
5-2. Hand lifter............................................................................................................................................................. 25
5-3. Adjusting the pressure of the presser foot ....................................................................................................... 26
5-4. Micro-lifter ............................................................................................................................................................ 26
5-5. Thread tension release changeover when using the knee lifter ..................................................................... 27
5-6. One-touch manual reverse feed (One-touch reverse feed type)..................................................................... 27
6. MAINTENANCE ............................................................................................................. 28
6-1. Changing procedure to bottom feed and the adjustment (for LH-3528 only)................................................ 28
6-2. Changing procedure to needle feed and the adjustment (for LH-3528 only)................................................. 29
6-3. Adjusting the hook needle guard....................................................................................................................... 30
6-4. Adjusting the inner hook guide.......................................................................................................................... 30
6-5. Adjusting the height and the inclination of the feed dog ................................................................................ 31
6-6. Replacing the gauge ........................................................................................................................................... 32
6-7. Adjusting the thread presser spring.................................................................................................................. 33
6-8. Adjusting the position of the moving knife....................................................................................................... 34
6-9. Position of the wiper ........................................................................................................................................... 35
6-10. Caution when installing the attachments........................................................................................................ 35
6-11. Replacing the bobbin thread slack preventer sprlng (For LH-3568, 3568-7, 3588, 3588-7) ........................ 36
6-12.
Stop of the needle bars and angle of corners for corners stitching (For LH-3568, 3568-7, 3588, 3588-7).... 36
7. STITCH-TO-ANGLE TABLE BY GAUGE (PITCH AND mm CONVERSION TABLE).. 37
8. GAUGE SETS................................................................................................................ 38
9. TROUBLES AND CORRECTIVE MEASURES ............................................................. 47
10. MOTOR PULLEY AND BELT ...................................................................................... 48

– 1 –
1. SPECIFICATIONS
Model name LH-3528 LH-3528-7
(with automatic thread trimmer)
Application For light - and medium - weight materials
S type : standard,F type : foundation, A type : light-weight materials, G type : jeans
Hook Small hook Small hook
Thread trimmer Not provided Provided
Separately
driven needle bar
mechanism
Not provided Not provided
Max. sewing speed 3,000 sti/min
Needle DP x 5 #9 to #16 (For F,A and S types), DP x 5 #16 to #22 (G type)
Gauge size 3/32" to 1-1/2" 1/8" to 1-1/4"
2.4 to 38.1 mm 3.2 to 31.8 mm
Lift of presser foot 13 mm by knee lifter, 7 mm by hand lifter lever
Lubrication JUKI NEW DEFRIX OIL No. 1 or JUKI MACHINE OIL #7
Noise
Workplace-related noise at sewing speed
n = 2,750 min–1 : LpA ≦84 dB(A)
Noise measurement according to DIN 45635-48-A-1.
Model name LH-3568
(with incorporating corner stitching)
LH-3568-7
(with automatic thread trimmer incorporating
corner stitching)
Application For light- and medium-weight materials
S type : standard, G type : jeans
Hook Small hook Small hook
Thread trimmer Not provided Provided
Separately
driven needle bar
mechanism
Provided Provided
Max. sewing speed 3,000 sti/min
Needle DP x 5 #9 to #16 (S type), DP x 5 #16 to #22 (G type)
Gauge size 1/8" to 3/4"
3.2 to 19.1 mm
Lift of presser foot 13 mm by knee lifter, 7 mm by hand lifter lever
Lubrication JUKI NEW DEFRIX OIL No. 1 or JUKI MACHINE OIL #7
Noise
Workplace-related noise at sewing speed
n = 3,000 min–1 : LpA ≦83.5 dB(A)
Noise measurement according to DIN 45635-48-A-1.

– 2 –
Model name LH-3578 LH-3578-7
(with automatic thread trimmer)
Application For medium - weight materials
G type : jeans
Hook Large hook Large hook
Thread trimmer Not provided Provided
Separately
driven needle bar
mechanism
Not provided Not provided
Max. sewing speed 3,000 sti/min
Needle DP x 5 #16 to #22 (G type)
Gauge size 3/16" to 1-1/12" 3/16" to 3/8"
4.8 to 38.1 mm 4.8 to 9.5 mm
Lift of presser foot 13 mm by knee lifter, 7 mm by hand lifter lever
Lubrication JUKI NEW DEFRIX OIL No. 1 or JUKI MACHINE OIL #7
Noise
Declaration
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 86.5 dB ; (Includes KpA = 2.5 dB) ; according to ISO 10821- C.6.2
-ISO 11204 GR2 at 3,000 sti/min.
- Sound power level (LWA) :
A-weighted value of 91.5 dB ; (Includes KpA = 2.5 dB) ; according to ISO 10821- C.6.2
-ISO 11204 GR2 at 3,000 sti/min.
Model name LH-3588
(with incorporating corner stitching)
LH-3588-7
(with automatic thread trimmer incorporating
corner stitching)
Application For medium - weight materials
G type : jeans
Hook Large hook Large hook
Thread trimmer Not provided Provided
Separately
driven needle bar
mechanism
Provided Provided
Max. sewing speed 3,000 sti/min
Needle DP x 5 #16 to #22 (G type)
Gauge size 3/16" to 3/8"
4.8 to 9.5 mm
Lift of presser foot 13 mm by knee lifter, 7 mm by hand lifter lever
Lubrication JUKI NEW DEFRIX OIL No. 1 or JUKI MACHINE OIL #7
Noise
Declaration
- Equivalent continuous emission sound pressure level (LpA) at the workstation :
A-weighted value of 85 dB ; (Includes KpA = 2.5 dBA) ; according to ISO 10821- C.6.2
-ISO 11204 GR2 at 3,000 sti/min.
- Sound power level (LWA) :
A-weighted value of 89.5 dB ; (Includes KpA = 2.5 dBA) ; according to ISO 10821- C.6.2
-ISO 11204 GR2 at 3,000 sti/min.

– 3 –
2. NAME OF EACH COMPONENT
1Separately driven needle changeover lever
(LH-3568, 3568-7, 3588, 3588-7)
2Thread take-up cover
3Finger guard
4Thread tension controller
5Control box
6Pedal
7Knee padKnee pad
!0
2
3
6
5
8
7
4
9
!2
!4
!3
!5
!1
1
8Power switch
9Reverse feed switchReverse feed switch
!0 Operation panel
!1 Bobbin winder
!2 Thread stand
!3 Oil supply opening
!4 Reverse feed control lever
!5 Hand lifter lever

– 4 –
3. INSTALLATION
Hold and transport the sewing machine with two
persons as shown in the illustration.
Do not put protruding articles such as the
screwdriver and the like at the location where the
sewing machine is placed.
1) Transporting procedure of the sewing machine
2) Caution when placing the sewing machine
3-1. Caution at the time of set-up

– 5 –
3) Remove air vent cap 5attached to the
machine bed. (Be sure to attach cap 5when
transporting the machine head in the state
that the machine head is removed from the
machine table.)
3-2. Installation of the sewing machine
1) The under cover should rest on the four
corners of the machine table groove.
22.5 mm 18.5 mm
If the sewing machine is operated without
removing air vent cap 5, oil leakage from
gear box portion Cmay occur.
2) Fix two rubber seats 1on side A(operator’
s side) using nails 2as illustrated above. Fix
two cushion seats 3on side B(hinged side)
using a rubber-based adhesive. Then place
under cover 4 on the xed seats.
(1) Installing the under cover
1
2
4
3
AB
C
5
1
3
1
3

– 6 –
4) Insert hinge 6into the machine main body.
Fit the machine head to table rubber hinges
7and place it on head cushions 8on the
four corners.
5) Attach head support rod 9to the table.
6) Remove inlet port !0 for circulation which
is xed to the oil tank installing plate, and
securely insert it into lter !1 until it goes
no further after removing cap !4 which is
attached to the end of the inlet port. Then set
the inlet port to D.
Place urethan lter !2 on E, and place lter
!3 of thin plate type (small mesh plate) on it.
6
6
7
9
8
7
D
E
!0
!1
!3
!2
!4
Circulation trouble may occur unless inlet
port !0 for circulation is securely inserted
into ler !1 until it goes no further.

– 7 –
3-3. Adjusting the height of the knee lifter
1) The standard height of the presser foot lifted
using the knee lifter is 12 mm.
2) You can adjust the presser foot lift up to 13
mm using knee lifter adjust screw 1.
Do not operate the sewing machine in the
state that the presser foot 3is lifted by
12 mm or more since the needle bar 2
comes in contact with the presser foot 3.
3-4. Installation of thread stand
Assemble the thread stand, set it up on the machine table using the installation hole in the table and
tighten nut 1gently.
When you use power supplied by the overhead power line, pass the power supply cord through hollow
spool rest rod 2.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
2
3
1
1
2

– 8 –
4-1. Method of lubrication
(1) Method of circulating lubrication (when the oil collected in the under cover is reused)
(2) Method of non-circulation type lubrication (when only the clean oil is always used)
 Periodically(approximatelyonceinthreemonths)cleantheaforementionedltersections(four
places)inordertousethemachineforalongtime.Whenthelterisclogged,lubricationtrouble
will occur and break-down will be caused.
 Inaddition,whentheoilbecomesdirty,replacetheoilgatheredintheoiltankandtheundercover.
Put cap 3to inlet port for circulation 1in the
same state as that at the time of delivery, and
securely x it to the position where it does not
come in contact with the moving section.
* Remove drain screw 2and dump the oil
which has dropped to the under cover.
When inlet port for circulation 1comes
incontactwiththeoilsurface,oilis
absorbedwithoutpassingthelter.Asa
result,break-downwillbecaused.
 Inaddition,whencap3isnotinserted,
oil leakage from inlet port for circulation
1or unstableness of oil amount in the
hook may occur.
Oil tank
Filter for circulation
Urethanlter
Filter for plunger
Plunger
Filter for plunger 2
4. PREPARATION OF THE SEWING MACHINE
2
Lubrication
Circulation
Lubrication to hook side
Circulation
1
2
3

– 9 –
4-2. Lubrication to the oil tank
Fill the oil tank with oil for hook lubrication before
operating the sewing machine.
1) Remove oil hole cap 1 and ll the oil tank
with JUKI NEW DEFRIX OIL No.1 (Part No.
: MDFRX1600C0) or JUKI MACHINE OIL #7
(Part No. : MML007600CA) using the oiler
supplied with the machine.
2) Fill the oil tank with the oil until the top end of
oil amount indicating rod 3comes between
the upper engraved marker line and the lower
engraved marker line of oil amount indicating
window 2.
If the oil is lled excessively, it will leak from
the air vent hole in the oil tank or proper
lubrication will be not performed. So, be
careful.
3) When you operate the sewing machine, rell
oil if the top end of oil amount indicating rod
3comes down to the lower engraved marker
line of oil amount indicating window 2.
WARNING :
1. Do not connect the power plug until the lubrication has been completed so as to prevent accidents due
to abrupt start of the sewing machine,
2. To prevent the occurrence of an inflammation or rash, immediately wash the related portions if oil
adheres to your eyes or other parts of your body.
3. If oil is mistakenly swallowed, diarrhea or vomitting may occur. Put oil in a place where children cannot
reach.
3
2
1
Upper
engraved
marker line
Lower
engraved
marker line
• When lling the oil tank with the oil initially, make sure that the oil amount indicating rod works. When it
does not work at this time, make it work by tilting the sewing machine once.
• When you use a new sewing machine or a sewing machine after an extended period of disuse, use the
sewing machine after performing break-in at 2,000 sti/min or less.
• For the oil for hook lubrication, purchase JUKI NEW DEFRIX OIL No. 1 (Part No. : MDFRX1600C0) or
JUKI MACHINE OIL #7 (Part No. : MML007600CA).
• Be sure to lubricate clean oil.
In case of the circulation type lubrication method, when using the sewing machine for the rst time, the oil
amount in the oil tank decreases until the oil has collected in the ler for circulation. When the top end of oil
amount indicating rod is lower than the lower engraved marker line, add the oil to the oil tank again so that
the top end enters between the upper and lower engraved marker lines.

– 10 –
Adjust the amount oil using adjusting screw 1. Turn screw 1clockwise to increase the amount of oil
in the hook or counterclockwise to decrease it. Measure the amount of oil in ve seconds. When the
amount of oil is excessively decreased, break-down will be caused. So, be careful.
Oil splashes
Oil amount
decreases
Oil amount
increases
1
4-4. Adjusting the amount of oil in the hook
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
4-3. Draining of oil from the oil tank
When draining oil from the oil tank, loosen drain
screw 1with the L-shaped screwdriver (Part No.
: B9101490000) supplied as accessories and
remove it.
1
WARNING :
1. To prevent accidents caused by abrupt start of the sewing machine, do not connect the power
plug until draining of oil has been completed.
2. To prevent the occurrence of an inammation or rash, immediately wash the related portions if
oil adheres to your eyes or other parts of your body.
3. If oil is mistakenly swallowed, diarrhea or vomitting may occur. Put oil in a place where children
cannot reach.

– 11 –
To use in safety, replace the oil wick of hook section with a new one approximately once a year with
the procedure below.
1) Loosen setscrews 2(small hook : 2 places,
large hook : 3 places) and remove hook gib 1.
When strongly pressing oil wick 5, it may
be broken. Lightly insert it to such an
extent that it is not drawn out.
When loosening/assembling, do not allow
the slit section of oil plug 4to be burred.
2) Remove inner hook 3.
3) Loosen oil plug 4with the L-shaped
screwdriver (Part No. : B9101490000) and
remove it.
4) Draw out oil wick 5inserted into oil plug 4,
and replace it with a new one.
Small hook 11015906
Large hook 11404704
[Part No. of oil wick 5]
After the replacement, assemble oil plug 4,
inner hook 3and hook gib 1to the hook by
reversing the above procedure.
Perform conrming of oil splash.
5
1
2
4
3

– 12 –
4-5. Oil in the feed box
When using the sewing machine, make sure that
the oil is put in the feed box from oil conrming
window 1.
Do not add oil to the feed box since the
adequate amount of oil which is different
from the hook oil has been put in the feed
box.
1

– 13 –
• Never lubricate oil to the grease applying places.
• When grease is applied more than is necessary, there is a fear that grease leaks from the thread
take-up lever cover section or the needle bar. So, be careful.
• Be sure to use the grease contained in JUKI GREASE A TUBE (Part No. : 40006323) supplied with
the machine head as accessories.
4-6. Applying grease
To use the sewing machine in safety, periodically perform grease-up (standard is once in 2 to 3 years)
to the grease applying sections of the respective models with the cotton bar or the like. When using
SC-500, when the time of grease-up comes, the warning alarm sounds. When the alarm sounds,
perform grease-up.
[LH-3528, 3528-7, 3578, 3578-7]
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Thread take-up
lever (oil wick)
Needle bar Face plate
lubrication felt
A
[Grease keeping place]
The grease tube is installed on the inside of
window plate A.
Remove wiper cover 1, and apply grease to slot section 2of wiper solenoid base and wiper link collar 3.
1
2
3
[LH-3528-7, 3568-7, 3578-7, 3588-7]
Square block

– 14 –
Remove the rubber cap, take out the felt in A,
pour new grease in the hole, and put the felt to
which grease has been soaked after removing old
grease adhered to the inside of the hole and the
felt.
Further, pour grease above the felt and cover it
with the rubber cap.
[LH-3568, 3568-7, 3588, 3588-7]
[Common]
A
Thread take-up
lever (oil wick)
Felt
Needle bar bracket
Face plate
lubrication felt
Needle bar
Square block

– 15 –
[Releasing procedure of the grease-up warning] For SC-500
2
1
3
When a certain number of times of sewing has been performed, error code No. 220 1is displayed in
the control box at the time of turning ON the power, and warning buzzer sound ve times intermittently.
This warning informs of the grease replenishment time of the specied place. Be sure to perform grease
replenishment to the specied place. For the grease applying place, refer to "4-6. Applying grease", p.13
and 14.For the releasing procedure of the warning after grease replenishment, simultaneously pressing
2and 3, turn ON the power.
[Releasing procedure of the grease-up “error”] For SC-500
When the machine has been used for a certain period of time without performing grease-up after the
display of error code No. 220, error code No. 221 is displayed and the machine stops running.
At this time, be sure to execute grease replenishment to the specied place and perform releasing the
error in accordance with the aforementioned description.

– 16 –
4-8. Attaching the needles
[LH-3568, 3568-7, 3588, 3588-7]
[LH-3528, 3528-7, 3578, 3578-7]
Switch "off" the motor.
Use DPx5 needles.
1) Turn the handwheel until the needle bar has
come up to the highest point of its stroke.
2) Loosen needle clamp screws 2and pick up
two needles 1in the way that their grooves
3are facing outwards.
3) Insert the needles into the needle clamp as
far as they will go.
4) Tighten needle clamp screws 2 rmly.
4-7. Installing the belt cover and the bobbin thread winder
1) Drill guide holes A, B, Cand Dof wood screws in the table.
2) Adjust the position of bobbin thread winder 3, and x it to the place of guide holes Aand Bwith
wood screws.
3) Temporarily x belt cover B 1to the place of guide holes Cand D.
4) Install belt cover A 2to the arm installing section.
5) Adjust the position of belt cover B 1 and x it with wood screw.
A
C
B
D
67
44
95
75.5
12
(mm)
1
2
3
47
3
3
1
2
2
1
1
2
2
1
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.

– 17 –
4-9. How to take out the bobbin case
1) Lift latch 1and take out the bobbin case and
the bobbin together.
2) Hold the bobbin case by latch raised, put
it into the shaft in the hook correctly and
release the latch.
4-10. Insertlng a bobbin in a bobbin case
1) Set a bobbin to the bobbin case so that the
bobbin turns in the direction of arrow mark A.
2) Pass the thread through thread slit 1in the
bobbin case and draw the thread and pull
the thread so that it passes under the tension
spring.
3) Pass thread through another thread slit 2
then, pass it through thread slit 3on the
bobbin case from the inside.
4) Put the thread on bobbin threads slack
preventer spring 4.
1
2
4
3
1
1) Set a bobbin to the bobbin case so that the
bobbin turns in the direction of arrow mark A.
2) Pass the thread through thread slit 1in the
hook and draw the thread and pull it so that it
passes under the tension spring.
A
A
1
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
[LH-3568, 3568-7, 3588, 3588-7]
[LH-3528, 3528-7, 3578, 3578-7]
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.

– 18 –
4-11. Threading the machine head
Thread the machine head following the order as illustrated in the gure.
Pass the left-hand needle thread, toward the machine head, in the order of 1to !5. Pass the right-hand
needle thread in the order of Ato P.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
1. Be careful of threading of needle clamp thread guides (!4, O).
･ Figure A for thin lament thread of #60 or less
･ Figure B for thick lament thread and polyester spun thread of #50 or more
2. Pass right-side needle thread through the upper side of thread guide pin H.
3. Pass the thread through the intermediate thread guide of LH-3528-7 and 3568-7, 3578-7, 3588-7 as
follows.
･Fig. C for polyester spun thread
･ Fig. D for lament thread
1
2
A
B
9
6
8- I
7 H G
E
F
5
C
D
34
J
Intermediate
thread guide
!0 - K
!1 - L
!2 - M
!3 - N
!4
!5
O
P
K
!0
Right-hand
needle thread
Left-hand
needle thread
Fig A Fig B
Fig C Fig D