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