JUKI LU-1510 Quick start guide

R
ENGINEER’S MANUAL
29339306
No.01
1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE
(AUTOMATIC LUBRICATION)
LU-1510
1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE WITH AUTOMATIC THREAD
TRIMMER (AUTOMATIC LUBRICATION)
LU-1510-7
1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE
LU-1508
1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE (FOR EXTRA HEAVY-WEIGHT MATERIALS)
LU-1508H

PREFACE
This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance of
the machine.
The Instruction Manual for these machines intended for the maintenance personnel and operators at an apparel
factory contains operating instructions in detail. And this manual describes “Standard Adjustment”, “Adjustment
Procedures”, “Results of Improper Adjustment”, and other important information which are not covered by the Instruction
Manual.
It is advisable to use the relevant Instruction Manual and Parts List together with this Engineer’s Manual when carrying
out the maintenance of these machines.
In addition, for the motor for the sewing machine with thread trimmer, refer to the separate Instruction Manual or
Engineer’s Manual for the motor. And for the control panel, refer to the Instruction Manual for the control panel.
This manual gives the “Standard Adjustment” on the former page under which the most basic adjustment value is
described, and on the latter page “Results of Improper Adjustment” under which stitching errors and troubles arising
from mechanical failures are described together with the “Adjustment Procedures”.

CONTENTS
1. SPECIFICATIONS....................................................................................................... 1
2. STANDARD ADJUSTMENT ....................................................................................... 3
1) Position of the needle entry..........................................................................................................................................3
2) Longitudinal position of the feed dog ...........................................................................................................................3
3) Lateral position of the feed dog ....................................................................................................................................5
4) Height of the feed dog ..................................................................................................................................................5
5) Height of the hook ........................................................................................................................................................7
6) Adjusting the inner hook guide .....................................................................................................................................7
7) Needle-to-hook timing ..................................................................................................................................................9
8) Presser lifter lever ......................................................................................................................................................11
9) Knee lifter ...................................................................................................................................................................11
10) Main shaft-to-hook driving shaft timing ....................................................................................................................13
11) Feed drive eccentric cam timing ..............................................................................................................................13
12) Installing position of the alternate vertical movement amount detecting switch.......................................................15
13) Top feed cam timing.................................................................................................................................................17
14) Feed movement .......................................................................................................................................................17
Ⅰ. Amount of alternate vertical movement of walking foot and presser foot ............................................................17
◯In case of the machine without thread trimmer .............................................................................................17
◯In case of the machine with thread trimmer ..................................................................................................19
Ⅱ. Amount of alternate movement of walking foot and presser foot ........................................................................19
15) Needle sway (Optional selection of LU-1510 and LU-1510-7 only) .........................................................................21
16) Stitch length of normal/reverse feed ........................................................................................................................21
17) Balancer ...................................................................................................................................................................21
18) Position of the reverse feed control lever .................................................................................................................23
19) Safety clutch.............................................................................................................................................................23
20) Lubrication................................................................................................................................................................25
3. STANDARD ADJUSTMENT OF THE ADDITIONAL DEVICES (LU-1510-7)........... 29
(1) Thread trimmer device .................................................................................................. 29
1) Position of the counter knife and the clamp spring ....................................................................................................29
2) Position of the counter knife base ..............................................................................................................................29
3) Vertical position of the moving knife...........................................................................................................................31
4) Adjusting the knife pressure .......................................................................................................................................31
5) Thread trimmer solenoid ............................................................................................................................................33
6) Thread trimmer cam ...................................................................................................................................................33
7) Thread trimmer cam timing ........................................................................................................................................35
8) Connecting the driving arm and the thread trimmer roller arm...................................................................................35
4. INSTALLAION OF THE OPTIONAL PARTS ............................................................ 37
(1) Automatic reverse feed device..................................................................................... 37
1) Removing the side plate.............................................................................................................................................37
2) Removing the reverse feed control lever ...................................................................................................................37
3) Installing the reverse feed link hinge screw ...............................................................................................................37
4) Installing the reverse feed control lever .....................................................................................................................39
5) Installing the automatic reverse feed device ..............................................................................................................39
6) Installing the touch-back switch .................................................................................................................................41
7) Installing the pneumatic components .........................................................................................................................41
(2) Automatic presser foot lifter......................................................................................... 45
1) Assembling the automatic presser foot lifter ..............................................................................................................45
2) Installing the pneumatic device components .............................................................................................................47
5. PORTION TO WHICH LOCKTITE IS APPLIED........................................................ 49
6. SELECTIVE PARTS AND CONSUMABLE PARTS ................................................. 50
7. ENGRAVED MARKER DOTS ON THE HANDWHEEL ............................................ 51
8. PIPING DIAGRAM (LU-1510 AND LU-1510-7) ........................................................ 51
9. TABLE OF TROUBLES IN SEWING AND CORRECTIVE MEASURES ................. 52
10. TRABLE OF TROUBLES IN THREAD TRIMMING AND
CORRECTIVE MAESURES .................................................................................... 56

−1 −
1. SPECIFICATIONS
Item
Model name
Name of machine
Application
Sewing speed
Needle
Thread to be used
Thread to be trimmed
Stitch length
Lift of presser foot
Stitch adjusting method
Reverse feed method
Thread take-up lever
Needle bar stroke
Alternate vertical movement amount
Hook
Feed mechanism
Main shaft/hook driving shaft drive
Thread trimming method
Lubrication
Lubricating oil
Bed size
Free space for sewing
Handwheel size
Motor
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
LU-1510
1-needle, unison feed, lockstitch
machine (automatic lubrication)
Max. 2,500 rpm
–
Lever type
2.5 mm to 6.5 mm
Slot adjustment type
–
2P, 400W
Specifications
For heavy-weight materials
SCHMETZ 135 x 17 Nm 125 to 180 Standard : Nm 160
#30 to #5
Max. 9 mm (both normal/reverse feed)
Hand lifter : 9 mm Knee lifter : 16 mm
Dial method
Slide-type thread take-up lever
36 mm
Full-rotary vertical-axis 2.0-fold capacity hook (latch type)
Elliptic feed
Timing belt
Automatic (partial manual oiling)
JUKI New Defrix Oil No. 2
517 mm x178 mm
255 mm x 99 mm
Effective diameter of V belt section : ø93.3 mm
Outer diameter : ø160 mm
LU-1510-7
1-needle, unison feed, lockstitch
machine with automatic thread
trimmer (automatic lubrication)
Max. 3,000 rpm
#30 to #5
Air cylinder type
(With touch-back switch)
1 mm to 6.5 mm
Alternate vertical dial adjustment type
Cam-drive scissor trimming method
SC-380

−2 −
Hand lifter : 9 mm Knee lifter : 16 mm
Dial method
Lever type
Slide-type thread take-up lever
2.5 mm to 6.5 mm Slot adjustment type
Full-rotary vertical-axis 2.0-fold capacity hook (latch type)
Timing belt
Manual oiling
JUKI New Defrix Oil No. 2
517 mm x 178 mm
255 mm x 99 mm
Effective diameter of V belt section : ø93.3 mm
Item
Model name
Name of machine
Application
Sewing speed
Needle
Thread to be used
Stitch length
Lift of presser foot
Stitch adjusting method
Reverse feed method
Thread take-up lever
Needle bar stroke
Alternate vertical movement amount
Hook
Feed mechanism
Main shaft/hook driving shaft drive
Lubrication
Lubricating oil
Bed size
Free space for sewing
Handwheel size
Motor
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Specifications
LU-1508
1-needle, unison-feed,lockstitch
machine
For heavy-weight materials
Max. 2,500 rpm
SCHMETZ 135 x 17 Nm 125 to 180
Standard : Nm 160
#30 to #5
Max. 9 mm
(both normal/reverse feed)
36 mm
Ellipse feed
Outer diameter : ø160 mm
2P, 400W
LU-1508H
1-needle, unison feed, lockstitch
machine (For extra heavy-weight
materials)
For extra heavy-weight materials
Max. 2,000 rpm
SCHMETZ 190 Nm 125 to 180
Standard : Nm 160
#8 to #1
Max. 10 mm
(both normal/reverse feed)
38 mm
Box feed
Outer diameter : ø175 mm
2P, 400W

−3 −
2. STANDARD ADJUSTMENT
1) Position of the needle entry
2) Longitudinal position of the feed dog
Standard Adjustment
②③
A
60
①
①
②
〃〃
A
③
Fig. 1
Fig. 2
Fig. 3 Fig. 4
Fig. 5
A = Clearance between the throat plate and the
feed dog when the feed dog travels to the
front end.
Model Dimension A
LU-1510-7 9 ±0.1 mm
LU-1510 8.5 ±0.1 mm
LU-1508
LU-1508H 8 ±0.1 mm
Conditions
• Needle bar is set to the lower dead point of its stroke.
• Feed amount : 0 mm
Top surface of
throat plate
Conditions
• Needle bar is set to the lower dead point of its stroke.
• Feed amount : 0 mm

−4 −
Adjustment Procedures Results of Improper Adjustment
1. Set the stitch dial to “0” mm.
2. Turn the handwheel to bring the needle bar to the lower dead
point of its stroke.
3. Loosen setscrew ①in the needle bar frame rear arm.
4. Adjust the clearance between presser bar ②and walking
bar ③to the dimension A and securely tighten the setscrew.
At this time, measure the distance from the top surface of the
throat plate to the line as shown in Fig. 1 with the presser foot
raised.
(Caution) • Tighten the setscrew so that there is no thrust
play in the needle bar frame shaft.
1. Set the stitch dial to “0” mm.
2. Turn the handwheel to bring the needle bar to the lower dead
point of its stroke.
3. Loosen setscrew ③in the feed rocker.
4. Move the feed bar to adjust so that needle ①enters the center
of the needle hole of feed dog ②, and securely tighten the
setscrew.
How to check
1. Set the stitch dial at the maximum.
2. Turn the handwheel and check that the clearance between
the slot in the throat plate and the feed dog is as shown in
Fig. 4 at the position where the feed dog travels to its front
end.
In addition, check that the feed dog does not come in contact
with the throat plate at the position where the feed dog travels
to its rear end.
(Standard)
• When the feed amount is at its maximum, A = approx. 1.5
mm.
• Stitch skipping or needle breakage
will result.
• Loose stitches will result.
• The throat plate comes in contact
with the feed dog and contact noise
will occur. As a result, the throat
plate and the feed dog may be
damaged.
• Irregular stitches will result.

−5 −
3) Lateral position of the feed dog
4) Height of the feed dog
Standard Adjustment
①
②
〃〃
①
②
③④
A
Fig. 6
Fig. 7
Fig. 8
Conditions
• Needle bar is set to the lower dead point of its stroke.
• Feed amount : 0 mm
Conditions
• Feed amount : 0 mm
• Height of the feed dog is at its maximum.
Model Dimension A
LU-1510 0.4 to 0.5 mm
LU-1510-7
LU-1508 0.8 to 0.9 mm
LU-1508H

−6 −
Adjustment Procedures Results of Improper Adjustment
1. Set the stitch dial to “0” mm.
2. Turn the handwheel to bring the needle bar to the lower dead
point of its stroke.
3. Loosen the setscrew in the feed rocker as shown in Fig. 5.
4. Move the feed bar to adjust so that needle ①enters the center
of the needle hole of feed dog ②, and securely tighten the
setscrew.
1. Set the stitch dial to “0” mm.
2. Turn the handwheel to bring the height of the feed dog at its
maximum. (Set the needle bar to the lower dead point of its
stroke.)
3. Loosen setscrew ①in the feed bar fork and move feed bar
fork ②up or down to adjust feed dog ③to the dimension A
from top surface ④(central section) of the throat plate, and
securely tighten the setscrew.
• Stitch skipping or thread breakage
will result.
• Loose stitches will result.
• Needle breakage will result.
◯When the height of the feed dog is
excessively high :
• Stitch length becomes larger than
the graduation of the stitch dial.
• Balloon stitches will result.
• Phenomenon of the return of the
sewing product will occur.
◯When the height of the feed dog is
excessively low :
• Stitch length becomes smaller than
the graduation of the stitch dial.
• Feed force will be deteriorated.

−7 −
5) Height of the hook
6) Adjusting the inner hook guide
Standard Adjustment
①
②
③
④
①②
1 ±0.1
Fig. 9
0.1 to 0.3
Fig. 10
To come in contact with each other Conditions
• When the inner hook guide travels to
its back end.
• Press the inner hook stopper to the
groove in the throat plate.

−8 −
Adjustment Procedures Results of Improper Adjustment
1. Replace the thrust washer of the hook shaft upper bushing
and adjust so that the clearance provided between inner hook
stopping section ①in the throat plate and top surface ②of
the inner hook stopper is 1 ±0.1 mm.
(For the kind of the thrust washer, refer to “6. Selective parts
and consumable parts” on page 44.)
1. Turn the handwheel to bring inner hook guide ①to its back
end position.
2. Turn inner hook ②in the reverse direction of rotation of the
hook (in the direction of the arrow) and fit the inner hook stopper
to the inner hook stopping section in throat plate ③.
3. Loosen setscrew ④in the inner hook guide crank and adjust
so that a clearance of 0.1 to 0.3 mm is provided between the
inner hook guide and the protruding section of the inner hook.
4. After the adjustment, securely tighten the setscrew.
• Stitch skipping or thread breakage
will result.
• Needle breakage will result.
• Irregular stitches will result.
◯When the clearance is larger than
the specified value :
• Loose stitches or thread breakage
will result.
◯When the clearance is smaller than
the specified value :
• Inner hook or inner hook guide may
be damaged.

−9 −
①
②
A
③④
④
⑤
⑥
⑦
1.5 ±0.3 mm 2.5 ±0.3 mm (LU-1508H)
2.3 ±0.2 mm
⑥
⑦
⑧
0.05 to 0.15 mm
0.1 to 0.2 mm
Fig. 12
Fig. 13 Fig. 14
Fig. 15 Fig. 16
7) Needle-to-hook timing
Conditions
• Feed amount : 0 mm
• Needle bar goes up from the
lower dead point of its stroke.
Fig. 11
Model Dimension A
LU-1510 56.8 mm
LU-1508
LU-1510-7 58.8 mm
LU-1508H 52.3 mm
Standard Adjustment

−10 −
Ⅰ. Standard of the lower dead point of the needle bar
1. Set the stitch dial to “0” mm.
2. Turn the handwheel to bring needle bar ①to the lower dead
point of its stroke.
3. Loosen the setscrew in the face plate to remove the face
plate.
4. Loosen setscrew ②in the needle bar connection.
At this time, loosen the setscrew to such an extent that the
needle bar moves up or down by hand since the needle bar
drops if the setscrew is fully loosened.
5. Adjust the distance from the lower end of the needle bar frame
to the lower end of the needle bar to the dimension A, and
tighten the setscrew.
(For the LU-1510-7, there is an engraved marker line on the
needle bar.)
Ⅱ. Needle-to-blade point of hook timing
1. Set the stitch dial to “0” mm.
2. Turn the handwheel and loosen setscrew ②in the needle
bar connection to adjust so that a clearance of 1.5 mm is
provided between the top end of the needle eyelet of needle
⑥and blade point ⑦of the hook when needle bar ①is raised
by 2.3 mm from the lower dead point of its stroke. Then, tighten
the setscrew again.
(For the LU-1510-7, there is an engraved marker line on the
needle bar.)
3. Turn the handwheel to make the needle bar ascend by 2.3
mm from the lower dead point of its stroke. Loosen two
setscrews ③in the screw gear (small) so that blade point ⑦
of the hook is almost aligned with the center of needle ⑥.
For the LU-1508H, however, 2.5 ±0.3 mm instead of 2.3 mm
is applied.
4. Loosen setscrew ④in the hook shaft saddle and move the
hook shaft saddle to the right or left until a clearance of 0.05
to 0.15 mm is provided between the blade point of the hook
and the needle at the position where blade point ⑦of the
hook is almost aligned with the center of needle ⑥. After the
adjustment, tighten the setscrew.
5. Loosen two setscrews ⑤in the screw gear (large) and move
the screw gear (large) to the right or left until blade point ⑦of
the hook is aligned with the center of needle ⑥. After the
adjustment, tighten the setscrews.
6. Set the stitch dial at the maximum and check that the needle
and the blade point of the hook do not come in contact with
each other.
Ⅲ. Adjusting the hook needle guard
1. Bend hook needle guard ⑧to adjust so that the hook needle
guard pushes the side face of the needle to lean the needle
by 0.1 to 0.2 mm away from its straight position.
(Caution) • After tightening the screw gears of the hook
shaft, check that there is no thrust play in the
hook shaft.
• Check that there is a backlash in the screw
gears of the hook shaft.
Adjustment Procedures Results of Improper Adjustment

−11 −
Standard Adjustment
8) Presser lifter lever
9) Knee lifter
Top surface of
throat plate
Fig. 19
Condition
• State that the presser lifter
lever is lifted.
9 ±0.3 mm
Fig. 18
Presser lifter
lever
①
②③
Fig. 17
Top surface of
throat plate
Fig. 21
Fig. 20
* When the automatic presser foot lifter is attached,
refer to the item “(2) Automatic presser foot lifter”
of the Engineer’s Manual for LU-1500 series on
page 41.
Condition
• Lifting amount when the stopper screw
of knee-lifter lever A comes in contact
with the machine bed.
Knee-lifter
lever A Knee-lifter
lever B
①
②
16 ±0.5 mm

−12 −
Adjustment Procedures Results of Improper Adjustment
1. Loosen setscrew ①in the side cover located on the anti-
operator’s side, and remove side cover ②.
2. Loosen screw ③in the presser bar holder to make the state
that the presser lifter lever is lifted.
3. Adjust the lifting amount of the presser foot to 9 ±0.3 mm. At
this time, the adjustment can be performed with ease if you
insert a thing of 9 mm in thickness in between the top surface
of throat plate and the lower face of presser foot.
4. Tighten the screw in the presser bar holder. Move the presser
foot to the right or left and tighten the screw in the state that
the presser foot does not interfere with the walking foot.
5. Remove the thing inserted in between the top surface of throat
plate and the lower face of presser foot, and attach the side
cover.
1. Remove the knee pad plate and tilt the machine arm.
2. Loosen stopper nut ①and adjust the lifting amount by the
screwing amount of stopper screw ②. Adjust the height from
the top surface of throat plate to the lower face of presser
foot to 16 ±0.5 mm.
3. Taking care not to move the stopper screw, tighten the stopper
nut.
• Screw in the stopper screw →Lifting amount is decreased.
• Loosen the stopper screw →Lifting amount is increased.
○When the lifting amount of the
presser foot is large :
• Presser foot is held rising even
when the presser lifter lever is
returned to the home position.
○When the lifting amount of the
presser foot is small :
• Presser foot is not sufficiently lifted
and workability may be
deteriorated.
○When the lifting amount of the
presser foot is large :
• Top end of the needle bar
interferes with the walking foot
when the presser foot is lifted, and
the walking foot may be broken.
○When the lifting amount of the
presser foot is small :
• Presser foot is not sufficiently lifted
and workability may be
deteriorated.

−13 −
10) Main shaft-to-hook driving shaft timing
11) Feed drive eccentric cam timing
①
②
③
①
②
③
④
Fig. 22
Fig. 23
To be parallel.
Setscrew No. 1
Conditions
• Feed amount : 0 mm
• Needle bar is set to the lower dead point
of its stroke.
Main shaft
Conditions
• Feed amount : Maximum
• Needle bar is set to the lower dead point of its
stroke.
Standard Adjustment
○In case of LU-1508, LU-1510, LU-1510-7
○In case of LU-1508H
Setscrew No. 1 Main shaft
Feed triangular cam rod
Fig. 24
①
②

−14 −
Adjustment Procedures Results of Improper Adjustment
1. Set the stitch dial to “0” mm.
2. Turn the handwheel to bring the needle bar to the lower dead
point of its stroke.
3. Turn the handwheel so that screw No. 2 ①in the lower
sprocket wheel is parallel to top surface ②of the machine
bed.
4. Engage timing belt ③with lower sprocket wheel ④.
(Caution) • Fig. 17 shows the state when it is observed
from the handwheel side.
○In case of LU-1508H
1. Set the stitch dial at its maximum.
2. Loosen two setscrews ①in the feed drive eccentric cam.
3. Turn the handwheel to bring the needle bar to the lower dead
point of its stroke.
4. Turn feed drive eccentric cam ②to adjust so that the feed
dog does not move even when moving the reverse feed
control lever.
5. Securely tighten the setscrews.
(Standard)
• Setscrew No. 1 in the feed drive eccentric cam faces almost
just above at the lower dead point of the needle bar
○In case of LU-1508H
1. Set the stitch dial at its maximum.
2. Loosen two setscrews ①in the feed triangular cam.
3. Turn feed triangular cam ②to adjust so that the feed dog
does not move even when moving the reverse feed control
lever.
4. Securely tighten the setscrews.
(Standard)
• Setscrew No. 1 in the feed triangular cam faces almost just
above at the lower dead
(Caution) • When performing adjustment, if the cam slips in
the axial direction, torque becomes heavy. So, be
careful.
• Adjust the feed drive crank connecting rod so that
it is positioned almost in the center of the end face
of thrust collar ③of the feed drive eccentric cam
and the end face of the feed drive eccentric cam.
• After adjusting the feed drive timing, re-adjust the
top feed timing.
• Loose stitches will result.
• Feed timing and needle-to-hook
timing will change.
• Pitch error at high/low speed will be
deteriorated.
• Thread tension will change.
• Stitch tightening in normal/reverse
feed will change.

−15 −
Standard Adjustment
12) Installing position of the alternate vertical movement amount detecting switch
Alternate vertical
movement dial
• Speed in terms of the amount of alternate vertical movement can
be automatically changed over in 4 stages.
Stitch length : More than 6 mm
to less than 9 mm
2,000 rpm
2,000 rpm
2,000 rpm
1,800 rpm
Amount of alternate vertical
movement
Less than 2.5 mm
2.5 to less than 4 mm
4 to less than 4.75 mm
4.75 to less than 6.5
Stitch length : Less
than 6 mm
3,000 rpm
2,400 rpm
2,000 rpm
1,800 rpm
Switch (lower) (Wires :
White/black)
OFF
ON
ON
OFF
Scale of alternate vertical
movement dial
1 to 2.5
2.625 to 4
4.125 to 4.75
4.875 to 6.5
Switch (upper)
(Wires : Red/green)
OFF
OFF
ON
ON
Fig. 25
Alternate vertical movement
amount detecting switch Top cover
Bush
Pin
Spring
Hole in section A
Red Green
White Black
Fig. 26
①
②
Convex
8 ±0.1 mm
●Sewing speed of LU-1510-7

−16 −
Adjustment Procedures Results of Improper Adjustment
1. Turn the alternate vertical movement dial to adjust the scale
“1” to the convex of the top cover.
2. Loosen setscrew ①in the alternate vertical movement dial
and remove the alternate vertical movement dial.
At this time, be careful since there are a pin and a spring in
the hole in section A.
3. Loosen setscrews ②for installing the alternate vertical
movement amount detecting switch and adjust the distance
from the inner diameter of the bush to the end face of the
switch main body to 8 ±0.1 mm, and tighten the setscrews.
4. Adjust the scale “1” on the alternate vertical movement dial
to the convex of the top cover, place the pin and the spring in
the hole in section A, attach the alternate vertical movement
dial, and tighten the setscrew.
(Caution) When the position of the alternate vertical amount
detecting switch is changed, make sure that the
relation between the alternate vertical movement
dial and the sewing speed is proper.
• Sewing speed may not change
even when the alternate vertical
movement dial is turned.

−17 −
13) Top feed cam timing
◯In case of LU-1508, LU1508H, LU1510
14) Feed movement
Ⅰ. Amount of alternate vertical movement of walking foot and presser foot
◯In case of the machine
without thread trimmer
①
⑤
⑥
②
③
④
①②③
④
Fig. 27 Fig. 28
Setscrew No. 1
Standard
• Lower engraved marker line on top feed rear arm
③is aligned with the center of hinge screw ④.
Standard of the amount of alternate vertical
movement of walking foot and presser foot
• Upper engraved marker line : Approx. 5 mm
• Intermediate engraved marker line : Approx. 4 mm
• Lower engraved marker line : Approx. 3 mm
●Sewing speed table
• In case of LU-1510 and LU-1508
• In case of LU-1510-7
Amount of alternate vertical
movement of walking foot and
presser foot
Less than 3 mm
3 mm to less than 4 mm
4 mm to less than 6.5 mm
Stitch length : 6 mm or less
2,500 rpm
2,000 rpm
1,600 rpm
Stitch length : More than 6
mm to 9 mm or less
2,000 rpm
2,000 rpm
1,600 rpm
Amount of alternate vertical
movement of walking foot and
presser foot
Less than 2.5 mm
2.5 to less than 4 mm
4 mm to less than 4.75 mm
4.75 mm to less than 6.5 mm
Stitch length : 6 mm or less
3,000 rpm
2,400 rpm
2,000 rpm
1,800 rpm
Stitch length : More than 6
mm to 9 mm or less
2,000 rpm
2,000 rpm
2,000 rpm
1,800 rpm
• In case of LU-1508H
Amount of alternate vertical
movement of walking foot and
presser foot
Less than 4 mm
4 mm to less than 6.5 mm
Stitch length : 6 mm or less
2,000 rpm
1,600 rpm
Stitch length : More than 6
mm to 10 mm or less
1,600 rpm
1,600 rpm
Lower engraved
marker line Hinge screw
Conditions
• Feed amount : 0 mm
• Amount of alternate vertical
movement : Standard
• When the needle comes down.
Main shaft
To align
Standard Adjustment
Top feed cam rod
◯In case of LU-1510-7
Main shaft
Fig. 29
Screw No. 1
Top feed cam rod
Fig. 30
①
⑤
Fig. 31