JUKI LU-2810 Series, LU-2810-7 Series, LU-2810S-7, LU-2810A-7, LU-2810S Engineer's Manual

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Direct-drive, 1-Needle, Unison-feed Lockstitch Machine with a Vertical-axis Large Hook

海外講習会用121122LU-2810(-7)EM

LU-2810

Direct-drive, 1-Needle, Unison-feed Lockstitch Machine with a Vertical-axis Large Hook with an Automatic Thread Trimmer

LU-2810-7

ENGINEER’S MANUAL

40133310

No. E407-00

PREFACE

海外講習会用121122LU-2810(-7)EM

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 instruction in detail. And this manual describes “Standard Adjust-

ment”, “Adjustment Procedures”, “Results of Improper Adjustment”, and other important information

which are not covered in the Instruction Manual.

When carrying out the maintenance work on the sewing machine, be sure to refer also to the Instruction

Manual and the Parts List.

In addition, for the motor for the sewing machine with thread trimmer, refer to the separate Instruction

Manual or 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 and “How to adjust” are described.

TO ENSURE SAFE USE OF YOUR SEWING MACHINE

海外講習会用121122LU-2810(-7)EM

Adjustment : It means replacement of parts, disassembly, and repair assembly.

For the sewing machine, automatic machine and ancillary devices (hereinafter collectively referred to as "machine"), it is inevitable to conduct sewing work near moving parts of the machine. This means that there is always a possibility of unintentionally coming in contact with the moving parts. Operators who actually operate the machine and maintenance personnel who are involved in maintenance and repair of the

machine are strongly recommended to carefully read to fully understand the following of this engineer's manual before using/maintaining the machine. The content of the

Safety precautions

this engineer's manual includes items which are not contained in the specications of your product. The risk indications are classied into the following three different categories to help understand the meaning

of the labels of this engineer's manual and the product. Be sure to fully understand the following description and strictly observe the instructions.

(!) Explanation of risk levels

DANGER :

This indication is given where there is an immediate danger of death or serous injury if the person in charge or any third party mishandles the machine or does not avoid the dangerous situation when operating or maintaining the machine.

WARNING :

This indication is given where there is a potentiality for death or serious injury if the person in charge or any third party mishandles the machine or does not avoid the dangerous situation when operating or maintaining the machine.

CAUTION :

This indication is given where there is a danger of medium to minor injury if the person in charge or any third party mishandles the machine or does not avoid the dangerous situation when operating or maintaining the machine.

(@)

Pictorial warning indication

Items requiring special attention

Explanation of pictorial warning indications and warning labels

Be aware that holding the sewing machine during operation can hurt your hands.

There is a risk of entanglement in the belt resulting in injury.

There is a risk of injury if you touch the button carrier.

The correct direction is indicated.

Connection of a earth cable is indicated.

There is a risk of injury if contacting a moving section.

There is a risk of electrical shock if contacting a high-voltage section.

There is a risk of a burn if contacting a high-temperature section.

Be aware that eye deciency can

be caused by looking directly at the laser beam.

There is a risk of contact between your head and the sewing machine.

indication

Pictorial warning

Indication label

• There is the possibility that slight to serious injury or death may be caused.



• There is the possibility that injury may be caused by touching moving part.

• To perform sewing work with safety guard.

2

Warning label

• To perform sewing work with safety cover.

• To perform sewing work with safety protection device.

• Be sure to turn the power OFF before carrying out "machine-head threading,"Be sure to turn the power OFF before carrying out "machine-head threading,"



"needle changing," "bobbin changing" or "oiling and cleaning.

danger label

Electrical-shock

SAFETY PRECAUTIONS

海外講習会用121122LU-2810(-7)EM

Accident means "to cause personal injury or death or damage to property."

DANGER

When it is necessary to open the control box containing electrical parts, be sure to turn the power off and

wait for ve minutes or more before opening the cover in order to prevent accident leading to electrical

shock.

CAUTION

Basic precaution

1. Be sure to read the engineer's manual and other explanatory documents supplied with accessories of the machine before using the machine. Carefully keep the engineer's manual and the explanatory documents at hand for quick reference.

2. The content of this section includes items which are not contained in the specications of your product.

3. Be sure to wear safety goggles to protect against accident caused by needle breakage.

4. Those who use a heart pacer have to use the machine after consultation with a medical specialist.

5. Turn OFF the power before starting the work in order to protect against accident that can result in personal injury.

If it is inevitable to carry out work with the power ON, utmost care should be taken to prevent from de-

pressing the foot pedal or pressing the start switch by mistake.

6. Make sure, after the completion of replacement work, that neither connectors nor cables are damaged, slipped off or loosened in order to protect against accident that can result in personal injury.

Safety devices and warning labels

1. Be sure to operate the machine after verifying that safety device(s) is correctly installed in place and works normally in order to prevent accident caused by lack of the device(s).

2. If any of the safety devices is removed, be sure to replace it and verify that it works normally in order to prevent accident that can result in personal injury or death.

3. Be sure to keep the warning labels adhered on the machine clearly visible in order to prevent accident that can result in personal injury or death. If any of the labels has stained or come unstuck, be sure to change it with a new one.

Application and modication

Never use the machine for any application other than its intended one and in any manner other than that prescribed in the engineer's manual in order to prevent accident that can result in personal injury or death.

JUKI assumes no responsibility for damages or personal injury or death resulting from the use of the

machine for any application other than the intended one.

Never modify and alter the machine in order to prevent accident that can result in personal injury or death.

JUKI assumes no responsibility for damages or personal injury or death resulting from the machine

which has been modied or altered.

Education and training

1. In order to prevent accident resulting from unfamiliarity with the machine, the machine has to be used only by the operator who has been trained/educated by the employer with respect to the machine operation and how to operate the machine with safety to acquire adequate knowledge and operation skill. To ensure the above, the employer has to establish an education/training plan for the operators and educate/train them beforehand.

Items for which the power to the machine has to be turned off

Turning the power off: Turning the power switch off, then removing the power plug from the outlet. This

applies to the following.

1. Be sure to immediately turn the power off if any abnormality or failure is found or in the case of power failure in order to protect against accident that can result in personal injury or death.

2. To protect against accident resulting from abrupt start of the machine, be sure to carry out the following operations after turning the power off. For the machine incorporating a clutch motor, in particular, be sure to carry out the following operations after turning the power off and verifying that the machine stops completely.

2-1. For example, threading the parts such as the needle, looper, spreader etc. which have to be

threaded, or changing the bobbin. 2-2. For example, changing or adjusting all component parts of the machine. 2-3. For example, when inspecting, repairing or cleaning the machine or leaving the machine.

3. Be sure to remove the power plug by holding the plug section instead of the cord section in order to pre-

vent electrical-shock, earth-leakage or re accident.

4. Be sure to turn the power off whenever the machine is left unattended between works.

5. Be sure to turn the power off in the case of power failure in order to prevent accident resulting of break-

age of electrical components.

PRECAUTIONS TO BE TAKEN IN VARIOUS OPERATION STAGES

Transportation

海外講習会用121122LU-2810(-7)EM

1. Be sure to lift and move the machine in a safe manner taking the machine weight in consideration. Refer

to the text of the engineer's manual for the mass of the machine.

2. Be sure to take sufcient safety measures to prevent falling or dropping before lifting or moving the

machine in order to protect against accident that can result in personal injury or death.

3. Once the machine has been unpacked, never re-pack it for transportation to protect the machine against

breakage resulting from unexpected accident or dropping.

Unpacking

1. Be sure to unpack the machine in the prescribed order in order to prevent accident that can result in

personal injury or death. In the case the machine is crated, in particular, be sure to carefully check nails. The nails have to be removed.

2. Be sure to check the machine for the position of its center of gravity and take it out from the package

carefully in order to prevent accident that can result in personal injury or death.

Installation

(!) Table and table stand

Be sure to use JUKI genuine table and table stand in order to prevent accident that can result in personal injury or death. If it is inevitable to use a table and table stand which are not JUKI genuine ones, select the table and table stand which are able to support the machine weight and reaction force during operation.

2. If casters are tted to the table stand, be sure to use the casters with a locking mechanism and lock

them to secure the machine during the operation, maintenance, inspection and repair in order to prevent accident that can result in personal injury or death.

(@) Cable and wiring

Be sure to prevent an extra force from being applied to the cable during the use in order to prevent electrical-

shock, earth-leakage or re accident. In addition, if it is necessary to cable near the operating

as the V-belt, be sure to provide a space of 30 mm or more between the operating section and the cable.

2. Be sure to avoid starburst connection in order to prevent electrical-shock, earth-leakage or re accident.

3. Be sure to securely connect the connectors in order to prevent electrical-shock, earth-leakage or re ac-

cident. In addition, be sure to remove the connector while holding its connector section.

section such

(#) Grounding

1. Be sure to have an electrical expert install an appropriate power plug in order to prevent accident caused

by earth-leakage or dielectric strength voltage fault. In addition, be sure to connect the power plug to the grounded outlet without exceptions.

2. Be sure to ground the earth cable in order to prevent accident caused by earth leakage.

($) Motor

1. Be sure to use the specied rated motor (JUKI genuine product) in order to prevent accident caused by

burnout.

2. If a commercially available clutch motor is used with the machine, be sure to select one with an entan-

glement preventive pulley cover in order to protect against being entangled by the V-belt.

Before operation

1. Be sure to make sure that the connectors and cables are free from damage, dropout and looseness be-

fore turning the power on in order to prevent accident resulting in personal injury or death.

2. Never put your hand into the moving sections of the machine in order to prevent accident that can result

in personal injury or death.

In addition, check to be sure that the direction of rotation of the pulley agrees with the arrow shown on

pulley.

3. If the table stand with casters is used, be sure to secure the table stand by locking the casters or with

adjusters, if provided, in order to protect against accident caused by abrupt start of the machine.

During operation

1. Be sure not to put your ngers, hair or clothing close to the moving sections such as the handwheel,

hand pulley and motor or place something near those sections while the machine is in operation in order to prevent accident caused by entanglement that can result in personal injury or death.

2. Be sure not to place your ngers near the surround area of the needle or inside the thread take-up lever

cover when turning the power on or while the machine is in operation in order to prevent accident that can result in personal injury or death.

3. The machine runs at a high speed. Never bring your hands near the moving sections such as looper,

spreader, needle bar, hook and cloth trimming knife during operation in order to protect your hands against injury. In addition, be sure to turn the power off and check to be sure that the machine completely stops before changing the thread.

4. Be careful not to allow your ngers or any other parts of your body to be caught between the machine

and table when removing the machine from or replacing it on the table in order to prevent accident that can result in personal injury or death.

Be sure to turn the power off and check to be sure that the machine and motor completely stop before removing the belt cover and V-belt in order to prevent accident caused by abrupt start of the machine or motor.

If a servomotor is used with the machine, the motor does not produce noise while the machine is at rest. Be sure not to forget to turn the power off in order to prevent accident caused by abrupt start of the motor.

7. Never use the machine with the cooling opening of the motor power box shielded in order to prevent re

accident by overheat.

iii

Lubrication

海外講習会用121122LU-2810(-7)EM

1. Be sure to use JUKI genuine oil and JUKI genuine grease to the parts to be lubricated.

2. If the oil adheres on your eye or body, be sure to immediately wash it off in order to prevent inamma-

tion or irritation.

3. If the oil is swallowed unintentionally, be sure to immediately consult a medical doctor in order to pre-

vent diarrhea or vomiting.

Maintenance

1. In prevention of accident caused by unfamiliarity with the machine, repair and adjustment has to be car-

ried out by a service technician who is thoroughly familiar with the machine within the scope dened in

the engineer's manual. Be sure to use JUKI genuine parts when replacing any of the machine parts. JUKI assumes no responsibility for any accident caused by improper repair or adjustment or the use of any part other than JUKI genuine one.

2. In prevention of accident caused by unfamiliarity with the machine or electrical-shock accident, be sure

to ask an electrical technician of your company or JUKI or distributor in your area for repair and maintenance (including wiring) of electrical components.

3. When carrying out repair or maintenance of the machine which uses air-driven parts such as an air cyl-

inder, be sure to remove the air supply pipe to expel air remaining in the machine beforehand, in order to prevent accident caused by abrupt start of the air-driven parts.

4. Be sure to check that screws and nuts are free from looseness after completion of repair, adjustment

and part replacement.

5. Be sure to periodically clean up the machine during its duration of use. Be sure to turn the power off and

verify that the machine and motor stop completely before cleaning the machine in order to prevent accident caused by abrupt start of the machine or motor.

6. Be sure to turn the power off and verify that the machine and motor stop completely before carrying out

maintenance, inspection or repair of the machine. (For the machine with a clutch motor, the motor will keep running for a while by inertia even after turning the power off. So, be careful.)

7. If the machine cannot be normally operated after repair or adjustment, immediately stop operation and

contact JUKI or the distributor in your area for repair in order to prevent accident that can result in personal injury or death.

8. If the fuse has blown, be sure to turn the power off and eliminate the cause of blowing of the fuse and

replace the blown fuse with a new one in order to prevent accident that can result in personal injury or death.

9. Be sure to periodically clean up the air vent of the fan and inspect the area around the wiring in order to

prevent re accident of the motor.

10. In order to prevent accidents resulting in personal injury or death, adjustments have to be carried out

within the instructions described in this Engineer's Manual and in the Instruction Manual by the personnel who have been well trained by the employer with respect to the latest knowledge and safety for the machine.

11. Make sure that water is contained in cylinders and pipes, then remove water from them in order to pre-

vent accidents due to a malfunction of the machine.

Operating environment

1. Be sure to use the machine under the environment which is not affected by strong noise source (electro-

magnetic waves) such as a high-frequency welder in order to prevent accident caused by malfunction of the machine.

2. Never operate the machine in any place where the voltage uctuates by more than "rated voltage ±10 %"

in order to prevent accident caused by malfunction of the machine.

3. Be sure to verify that the air-driven device such as an air cylinder operates at the specied air pressure

before using it in order to prevent accident caused by malfunction of the machine.

4. To use the machine with safety, be sure to use it under the environment which satises the following

conditions:

Ambient temperature during operation 5℃ to 35℃ Relative humidity during operation 35 % to 85 %

5. Dew condensation can occur if bringing the machine suddenly from a cold environment to a warm one.

So, be sure to turn the power on after having waited for a sufcient period of time until there is no sign

of water droplet in order to prevent accident caused by breakage or malfunction of the electrical components.

6. Be sure to stop operation when lightning ashes for the sake of safety and remove the power plug in

order to prevent accident caused by breakage or malfunction of the electrical components.

7. Depending on the radio wave signal condition, the machine may generate noise in the TV or radio. If this

occurs, use the TV or radio with kept well away from the machine.

8. In order to ensure the work environment, local laws and regulations in the country where the sewing

machine is installed shall be followed. In the case the noise control is necessary, an ear protector or other protective gear should be worn according to the applicable laws and regulations.

9. Disposal of products and packages and treatment of used lubricating oil should be carried out properly

according to the relevant laws of the country in which the sewing machine is used.

PRECAUTIONS TO BE TAKEN IN VARIOUS OPERATION STAGES

海外講習会用121122LU-2810(-7)EM

Mechanical components

CAUTION

Transportation

1. Be sure to lift this machine with four or more workers and use a carriage for moving it in order to prevent personal injury.

2. Be sure to take sufcient safety measures to prevent falling or dropping before lifting or moving the

machine in order to protect against accident that can result in personal injury or death.

3. Installation is described in the Instruction Manual. Be sure to fully understand the description before putting the machine into operation.

Replacement of parts

1. In prevention of accident that can result in personal injury, be sure to carry out disassembly/assembly

work within the specied range given in this Engineer's Manual and in the Instruction Manual.

2. Turn OFF the power before starting the work in order to protect against accident that can result in personal injury.

If it is inevitable to carry out work with the power ON, utmost care should be taken to prevent from de-

pressing the foot pedal or pressing the start switch by mistake.

3. Be sure to carry out replacement work after having installed the machine in a stable state in order to protect against accident that can result in personal injury. In addition, be sure to select appropriate tools.

4. In prevention of accident that can result in personal injury, make sure, after the completion of adjustment work, that neither screws nor nuts are loosened or come in contact with other parts.

5. Be sure to use JUKI genuine parts when replacing any of the machine parts. JUKI assumes no responsibility for any accident caused by any part other than JUKI genuine one. In addition, in the event you cannot replace parts within the specied range, immediately stop the replacement work and ask JUKI or distributor in your area for replacement of the parts.

Adjustment

1. Be sure to adjust according to the instructions given in this Engineer's Manual and in the Instruction Manual in order to protect against accident that can result in personal injury.

2. Be sure to carry out replacement work after having installed the machine in a stable state in order to protect against accident that can result in personal injury. In addition, be sure to select appropriate tools.

3. In prevention of accident that can result in personal injury, make sure, after the completion of adjustment work, that neither screws nor nuts are loosened or come in contact with other parts.

4. Turn OFF the power before starting the work in order to protect against accident that can result in personal injury.

If it is inevitable to carry out work with the power ON, utmost care should be taken to prevent from de-

pressing the foot pedal or pressing the start switch by mistake.

5. In prevention of accident that can result in personal injury or entanglement accident, be sure to ensure safety at the time of test run. In addition, be sure to take care not to allow hair or cloths to come in contact with the machine belt.

Disassembly/assembly

1. In prevention of accident that can result in personal injury, be sure to carry out disassembly/assembly

work within the specied range given in this Engineer's Manual and in the Instruction Manual.

3. In prevention of accident that can result in personal injury, make sure, after the completion of adjustment work, that neither screws nor nuts are loosened or come in contact with other parts.

4. In prevention of accident that can result in personal injury, be sure to tighten screws and nuts in assembly work with a specied torque, if specied, or with an appropriate torque, if not specied. After the completion of assembly work, be sure to check that screws and nuts are not loosened before starting test run.

5. In prevention of accident that can result in personal injury, be sure to check whether the direction of rotation is correct at the time of test run.

6. In prevention of accident that can result in personal injury or entanglement accident, be sure to ensure safety at the time of test run. In addition, be sure to take care not to allow hair or cloths to come in contact with the machine belt.

PRECAUTIONS TO BE TAKEN IN VARIOUS OPERATION STAGES

海外講習会用121122LU-2810(-7)EM

Electrical components

CAUTION

Transportation

1. Be sure to lift this machine with four or more workers and use a carriage for moving it in order to prevent personal injury.

2. Be sure to take sufcient safety measures to prevent falling or dropping before lifting or moving the

machine in order to protect against accident that can result in personal injury or death.

3. Installation is described in the Instruction Manual. Be sure to fully understand the description before putting the machine into operation.

Replacement of parts

1. In prevention of accident caused by unfamiliarity with the machine or electrical-shock accident, be sure to ask an electrical technician of your company or JUKI or distributor in your area for replacement of electrical components.

2. When it is necessary to open the control box containing electrical parts, be sure to turn the power off and wait for ve minutes or more before opening the cover in order to prevent accident caused by unfamiliarity with the machine or electrical-shock accident. In addition, do not carry out replacement work with wet hands in order to prevent electrical-shock accident.

3. Be sure to replace parts according to the instructions given in this Engineer's Manual and in the Instruction Manual in order to protect against accident that can result in personal injury.

4. Be sure to carry out replacement work after having installed the machine in a stable state in order to protect against accident that can result in personal injury. In addition, be sure to select appropriate tools.

5. Make sure, after the completion of replacement work, that there is no loose soldering, no contact with other parts, inadequate contact between connectors and receptacles, and loose screws/nuts in order to protect against accident that can result in personal injury.

It should be remembered that some parts have been factory-insulated with tubes or tapes, or oated

above the PWB for safety's sake. In addition, internal wiring has been factory-routed or -clamped in such a way that it does not come close to high-voltage parts. Be sure to re-place those parts as they are at the time of delivery.

7. Be sure to use JUKI genuine parts when replacing any of the machine parts. JUKI assumes no responsibility for any accident caused by any part other than JUKI genuine one. In addition, in the event you cannot replace parts within the specied range, immediately stop the replacement work and ask JUKI or distributor in your area for replacement of the parts.

8. If the fuse has blown, be sure to turn the power off and eliminate the cause of blowing of the fuse and replace the blown fuse with a new one in order to prevent accident that can result in personal injury or death.

Adjustment

2. When it is necessary to open the control box containing electrical parts, be sure to turn the power off and wait for ve minutes or more before opening the cover in order to prevent accident caused by unfamiliarity with the machine or electrical-shock accident. In addition, do not carry out adjustment work with wet hands in order to prevent electrical-shock accident.

3. In prevention of accident that can result in personal injury, adjust adjustment variable resistor or the

like installed on PWB within the specied range given in this Engineer's Manual and in the Instruction

Manual.

5. In prevention of accident that can result in personal injury, make sure, after the completion of adjustment work, that neither screws nor nuts are loosened or come in contact with other parts.

7. In prevention of accident that can result in personal injury or entanglement accident, be sure to ensure safety at the time of test run. In addition, be sure to take care not to allow hair or cloths to come in contact with the machine belt.

Disassembly/assembly

1. In prevention of accident that can result in personal injury, be sure to carry out disassembly/assembly

work within the specied range given in this Engineer's Manual and in the Instruction Manual.

2. In prevention of accident caused by unfamiliarity with the machine or electrical-shock accident, be sure

海外講習会用121122LU-2810(-7)EM

to ask an electrical technician of your company or JUKI or distributor in your area for disassembly/assembly of electrical components.

3. When it is necessary to open the control box containing electrical parts, be sure to turn the power off and wait for ve minutes or more before opening the cover in order to prevent accident caused by unfamiliarity with the machine or electrical-shock accident. In addition, do not carry out disassembly/assembly work with wet hands in order to prevent electrical-shock accident.

5. In prevention of accident that can result in personal injury, be sure to tighten screws and nuts in assembly work with a specied torque, if specied, or with an appropriate torque, if not specied. After the completion of assembly work, be sure to check that screws and nuts are not loosened before starting test run.

6. In prevention of accident that can result in personal injury, make sure, after the completion of adjustment work, that neither screws nor nuts are loosened or come in contact with other parts.

7. Make sure, after the completion of replacement work, that neither connectors nor cables are damaged, slipped off or loosened in order to protect against accident that can result in personal injury.

It should be remembered that some parts have been factory-insulated with tubes or tapes, or oated

8. In prevention of accident that can result in personal injury, be sure to check whether the direction of rotation is correct at the time of test run.

9. In prevention of accident that can result in personal injury or entanglement accident, be sure to ensure safety at the time of test run. In addition, be sure to take care not to allow hair or cloths to come in contact with the machine belt.

vii

Precautions to be taken so as to use the LU-2800 Series more safely

海外講習会用121122LU-2810(-7)EM

1. Keep your hands away from needle when you turn ON the power switch or while the

machine is in operation.

DANGER

CAUTION

2. Do not put your ngers into the thread take-up cover while the machine is operating.

3. Turn OFF the power switch when tilting the machine head, or removing the belt cover

or the V belts.

4. During operation, be careful not to allow your or any other person’s head, hands or

clothes to come close to the handwheel, V belt and motor. Also, do not place anything

close to them.

5. Do not operate your machine with the belt cover and nger guard removed.

6. To avoid personal injury, be careful not to allow your ngers in the machine when tilt-

ing the machine head.

1. To ensure safety, never operate the machine with the ground wire for the power supply

removed.

2. When inserting/removing the power plug, the power switch has to be turned OFF in

advance.

3. In time of thunder and lightening, stop your work and disconnect the power plug from

the receptacle so as to ensure safety.

4. If the machine is suddenly moved from a cold place to a warm place, dew condensa-

tion may be observed. In this case, turn ON the power to the machine after you have

conrmed that there is no danger of water drops in the machine.

5. To prevent res, periodically draw out the power plug from the plug socket and clean

the root of the pins and the space between pins.

6. The hook rotates at a high speed while the machine is in operation.

To prevent possible injury to hands, be sure to keep your hands away from the vicinity

of the hook during operation. In addition, be sure to turn OFF the power to the ma-

chine when replacing the bobbin.

7. To avoid possible accidents due to abrupt start of the machine, be sure to turn OFF

the power to the machine.

8. Be careful of handling this product so as not to pour water or oil, shock by dropping,

and the like since this product is a precision instrument.

9. When tilting or returning the sewing machine to the home position, hold the upper

side of the machine head with both hands and perform the work quietly so that ngers

or the like are not caught in the machine.

viii

CAUTION BEFORE OPERATION

海外講習会用121122LU-2810(-7)EM

WARNING :

To avoid malfunction and damage of the machine, conrm the following.

• Before you put the machine into operation for the rst time after the set-up, clean it thoroughly.

Remove all dust gathering during transportation and oil it well.

• Conrm that voltage has been correctly set.

Conrm that the power plug has been properly connected to the power supply.

• Never use the machine in the state where the voltage type is different from the designated one.

• The direction of normal rotation of the machine is counterclockwise as observed from the pulley

side.

Take care not to allow the machine to rotate in the reverse direction.

• Never operate the machine unless the machine head and the oil tank have been lled with oil.

• For a test run, remove the bobbin and the needle thread.

• For the rst month, decrease the sewing speed and run the sewing machine at a speed of 80% or

less of the maximum sewing speed. As to the maximum sewing speed, see “25. SEWING SPEED

TABLE” in the Instruction Manual.

• Operate the handwheel after the machine has totally stopped.

CONTENTS

海外講習会用121122LU-2810(-7)EM

1. Specications ................................................................................................. 1

2. Standard adjustment ......................................................................................2

(1) Needle entry position (Standard gauge type) ............................................................... 2

(2) Needle entry position (Europe gauge type) .................................................................. 2

(3) Height of the feed dog ..................................................................................................... 4

(4) Height of the hook ........................................................................................................... 4

(5) Adjusting the inner hook guide ...................................................................................... 6

1) Clearance of inner hook guide .................................................................................................................6

2) Inner hook guide timing ............................................................................................................................ 6

(6) Needle-to-hook timing ..................................................................................................... 8

1) Height of the needle bar ........................................................................................................................... 8

2) Needle-to-blade point of hook timing .......................................................................................................8

3) Adjusting the hook needle guard ..............................................................................................................8

(7) Lift of the presser foot ................................................................................................... 10

1) Hand lifter ............................................................................................................................................... 10

2) Knee lifter (Without thread trimmer only) ...............................................................................................12

3) Automatic presser foot lifter (Machine with thread trimmer only) ...........................................................14

(8) Feed momentum ............................................................................................................ 16

1) Alternate momentum .............................................................................................................................. 16

(9) Needle sway (Adjusting the bottom feed amount) ..................................................... 16

(10) Feed cam timing ............................................................................................................ 18

1) Horizontal feed cam timing .....................................................................................................................18

2) Vertical feed cam timing ......................................................................................................................... 18

3) Top feed cam timing ...............................................................................................................................20

(11) Stitch length of forward/reverse feed .......................................................................... 22

(12) Position of the reverse feed control lever ................................................................... 22

(13) Safety clutch .................................................................................................................. 24

(14) Balancer .......................................................................................................................... 24

(15) Reverse feed cylinder .................................................................................................... 26

(16) Lubrication ..................................................................................................................... 28

(17) Thread trimmer device .................................................................................................. 30

1) Position of the counter knife and the clamp spring ................................................................................30

2) Position of the counter knife base ..........................................................................................................32

3) Vertical position of the moving knife .......................................................................................................32

4) Thread trimmer cam timing ....................................................................................................................34

5) Position of the thread trimmer cam ........................................................................................................36

6) Adjusting the knife pressure ................................................................................................................... 36

(18) Detection switch of the amount of alternate vertical movement .............................. 38

3. Portion to which LOCKTITE is applied ....................................................... 40

4. Selective parts and consumable parts .......................................................41

5. Applying grease ............................................................................................42

(1) Applying grease ............................................................................................................. 42

(2) Greasing points ............................................................................................................. 42

1) Needle bar rocking base ........................................................................................................................42

2) Alternate vertical change base ............................................................................................................... 43

3) Horizontal feed change base .................................................................................................................43

4) Greasing point indication drawing (* Indicating the points where grease is applied at shipment.) .........44

6. Engraved marker dots on the handwheel (for the machine with thread

trimmer only) ................................................................................................. 56

7. Lubrication route diagram ........................................................................... 57

8. Machine head wiring (for the machine with thread trimmer only) ...........58

(1) Connectors coming from machine head (Connect to control box) .......................... 58

(2) Connectors that are connected in the head cover ..................................................... 59

9. Troubles and corrective measures .............................................................60

(1) With regard to sewing ................................................................................................... 60

(2) With regard to thread trimming .................................................................................... 65

10. Drawing of table ............................................................................................69

(1) For without thread trimming ......................................................................................... 69

(2) For SC-922 ...................................................................................................................... 70

1. Specications

海外講習会用121122LU-2810(-7)EM

No. Item Application

1 Model LU-2810S (Standard gauge type)

LU-2810A (Europe gauge type)

2 Model name Direct-drive, 1-Needle, Unison-feed

Lockstitch Machine with a Vertical-

axis Large Hook

3 Application For heavy-weight materials 4 Sewing speed Max. 3,000 sti/min

See “25. SEWING SPEED TABLE” in the Instruction Manual. 5 Needle GROZ-BECKERT 135 x 17 (Nm 125 to Nm 180) (Standard : Nm 160) 6 Applicable thread size for

sewing

7 Applicable thread size to

be cut 8 Stitch length Max. 9 mm (forward/reverse feed) 9 Stitch length dial 1-pitch dial 2-pitch dial

10 Presser foot lift Hand lifter : 10 mm

11 Stitch length adjusting

mechanism

12 Reverse stitch adjusting

method

13 Thread take-up Link thread take-up 14 Needle bar stroke 40 mm 15 Alternate foot stroke 1 mm to 9 mm

16 Hook Vertical-axis 2-fold hook (Latch type) 17 Feed mechanism Box feed 18 Top and bottom feed

actuation mechanism

19 Thread trimming method Cam-driven scissors type

#30 to #5 (US : #46 to #138, Europe : 60/3 to 20/3)

Knee lifter : 20 mm

By lever Air cylinder type

Alternate foot stroke adjusted by long hole

LU-2810S-7 (Standard gauge type)

LU-2810A-7 (Europe gauge type) Direct-drive, 1-Needle, Unison-feed

Lockstitch Machine with a Vertical-

axis Large Hook with an Automatic

Thread Trimmer

#30 to #5 (US : #46 to #138,

Europe : 60/3 to 20/3)

Hand lifter : 10 mm

Automatic presser foot lifter : 20 mm

By dial

(with touch-back switch)

Timing belt

20 Lubrication Automatic lubrication by oil tank (with oil gauge) 21 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7)

or JUKI MACHINE OIL No. 7 22 Bed size 643 mm × 178 mm 23 Space under the arm 346 mm × 126 mm 24 Hand wheel size V-belt effective diameter : ø76.0 mm

Outer diameter : ø140 mm 25 Motor/Control box M51N 750W SC-922 26 Machine head weight 65.8 kg 27 Rated power consumption 84.7 W 28 Noise

*1 For the LU-2810-7, the sewing speed is automatically set according to the amount of the alternat-

ing vertical movement of the walking foot and the presser foot.

- Equivalent continuous emission sound pressure level (LpA) at the

workstation:

A-weighted value of 83.0 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 88.5 dB; (Includes KWA = 2.5 dB); according to ISO

10821- C.6.2 - ISO 3744 GR2 at 3,000 sti/min.

– 1 –

Outer diameter : ø123 mm

2. Standard adjustment

海外講習会用121122LU-2810(-7)EM

(1) Needle entry position (Standard gauge type)

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

Top surface of

(2) Needle entry position (Europe gauge type)

Model

LU-2810

LU-2810-7

[Conditions]

• Needle bar at lowest dead point

• Feed amount : 0 mm

• Height of feed dog : 0.5 to 0.6 mm

(Highest position)

Dimension E

(mm)

7.5 ± 0.1

Gauge type

Standard

gauge type

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Operator's side

Standard adjustment

Model

LU-2810

LU-2810-7

[Conditions]

• Needle bar at lowest dead point

• Feed amount : 0 mm

• Height of feed dog : 0.5 to 0.6 mm

(Highest position)

Dimension E

(mm)

5.2 ± 0.2

Gauge type

Europe

gauge type

– 2 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

1. Set the stitch dial to “0”.

2. Turn the handwheel to bring the needle bar to the lowest dead point of its stroke.

3. Loosen clamping screw

4. In the state that the presser foot is raised, adjust the clearance between presser bar 7 and walking bar 8 to dimension E, then securely tighten clamping screw 1 of the needle bar rocking link.

5. Loosen clamping screw 4 of the feed base arm.

6. Move the feed base center of the needle hole in feed dog 2. Then securely tighten clamping screw 4 of the feed base arm. (a = a’)

In addition, adjust the lateral clearances of feed dog 2 in terms

of the window of throat plate 3 to almost equal values. (A = B)

[Checking method]

1. Set the stitch dial to the maximum.

2. Turn the handwheel and make sure that feed dog come in contact with the throat plate 3 at the position where the feed dog 2 travels fully to the front or to the rear.

of the needle bar rocking link.

to adjust so that needle 6 enters the

does not

Results of Improper adjustment

Stitch skipping or needle break-

age will result.

Poorly tensed stitches will result.

Adjustment procedures

1. Set the stitch dial to “0”.

2. Turn the handwheel to bring the needle bar to the lowest dead point of its stroke.

3. Loosen clamping screw 4 of the feed base arm.

4. Adjust the clearance between throat plate 3 and feed dog 2 to dimension E, then securely tighten clamping screw 4 of the feed base arm.

5. Loosen clamping screw 1 of the needle bar rocking link.

6. Move the needle bar rocking base to adjust so that needle 6 enters the center of the needle hole in feed dog 2. Then securely tighten clamping screw 1 of the needle bar rocking link. (a = a’)

In addition, adjust the lateral clearances of feed dog 2 in terms

of the window of throat plate 3 to almost equal values. (A = B)

[Checking method]

1. Set the stitch dial to the maximum.

2. Turn the handwheel and make sure that feed dog 2 does not come in contact with the throat plate 3 at the position where the feed dog 2 travels fully to the front or to the rear.

Results of Improper adjustment

Stitch skipping or needle break-

age will result.

Poorly tensed stitches will result.

– 3 –

(3) Height of the feed dog

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

Top surface of

Model

LU-2810

LU-2810-7

[Conditions]

• Feed amount : 0 mm

• Height of feed dog : maximum

Dimension A

(mm)

0.5 to 0.6

(4) Height of the hook

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

Model

LU-2810 1 ± 0.1

LU-2810-7 1.5 ± 0.1

Dimension A

(mm)

– 4 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

1. Set the stitch dial to “0”.

2. Turn the handwheel to bring the height of the feed dog

the maximum. (Bring the needle bar to the lowest dead point of

its stroke.)

3. Loosen clamping screw

4. Turn the vertical feed front arm

feed dog 3 from top surface of the throat plate 4 to the dimen-

sion A. Then securely tighten clamping screw 1 of the vertical

feed front arm.

of the vertical feed front arm.

to adjust the height of the

When the height of the feed dog 3

is higher than the specied value :

Stitch pitch becomes larger than

the scale of the feed dial.

Balloon stitches will result.

Return of sewing product will oc-

cur.

The feed dog

tact with the knife, and the knife

and the feed dog 3 may be

damaged.

When the height of the feed dog 3

is lower than the specied value :

Stitch pitch becomes smaller

than the scale of the feed dial.

Feed force will be deteriorated.

comes in con-

Adjustment procedures

1. Loosen two setscrews

2. Draw out hook

3. Replace the washer

throat plate 4 and top surface of hook stopper section of hook

is dimension A.

(Refer to "4. Selective parts and consumable parts" about the

types of washer.)

4. Align the notched section of hook shaft

setscrews 1 of the hook. Then tighten two setscrews 1 of the

hook.

in the direction of the arrow.

of the hook.

to adjust so that the clearance between

and No. 1 screw of

Results of Improper adjustment

Stitch skipping or thread break-

age will result.

Needle breakage will result.

Irregular stitches will result.

– 5 –

(5) Adjusting the inner hook guide

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

1) Clearance of inner hook guide

2) Inner hook guide timing

Model Dimension A (mm)

LU-2810

LU-2810-7

[Conditions]

• When the inner hook guide travels to its back end.

• Press the inner hook stopper against the groove in the throat plate.

0.7 to 0.9

– 6 –

押し当て

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

1) Clearance of inner hook guide

1. Turn the handwheel in its normal rotational direction to bring

inner hook guide 1 to its back end position.

2. Turn inner hook

stopper B is pressed against the groove in throat plate 3.

3. Loosen setscrew

clearance between the inner hook guide 1 and protruding por-

tion C of the bobbin case to dimension A.

4. Tighten setscrew

down inner hook guide arm 5.

in the direction of the arrow until inner hook

of the inner hook guide arm. Adjust the

of the inner hook guide arm while pressing

When the clearance is larger than

the specied value :

Loose stitches or thread break-

age will result.

When the clearance is smaller than

the specied value :

Inner hook

guide 1 may be damaged.

or inner hook

2) Inner hook guide timing

1. Loosen setscrew 6 of the opener cam.

2. Three marker dots A on the handwheel 7 aligns with marker

line B on the motor cover 8 when inner hook guide 1 is in its

back end position.

* Tighten setscrew 6 of the opener cam in the state that the

opener cam 9 is pressed against the lower shaft gear !0.

– 7 –

(6) Needle-to-hook timing

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

1) Height of the needle bar

2) Needle-to-blade point of hook timing

3) Adjusting the hook needle guard

Model

LU-2810

LU-2810-7

[Conditions]

• Feed amount : 0 mm

• Needl bar rises from the lowest dead point of its stroke.

Dimension A

(mm)

2.3 ± 0.2 1.5 ± 0.2 0.05 to 0.2

Dimension B

(mm)

Dimension C

(mm)

– 8 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

1) Height of the needle bar

1. Set the stitch dial to “0”.

2. Loosen setscrews .

3. Turn the handwheel to bring so that needle bar

from the lowest dead point of its stroke to dimension A.

4. Loosen clamping screw

At this time, loosen the screw to such an extent that needle bar

moves up and down by hand since needle bar 3 drops if

the screw is fully loosened.

5. Move needle bar

end of the needle eyelet to blade point of the hook 7 becomes dimension B. Then tighten clamping screw 4 of the needle bar holder.

2) Needle-to-blade point of hook timing

1. Set the stitch dial to “0”.

2. Loosen clamping screw

3. Turn the handwheel and when dimensions A and B are approx-

imately obtained, loosen two setscrews 8 of the hook shaft base. Then move the hook shaft base 9 to the right or left to adjust so that the clearance between needle 6 and blade point of the hook 7 is dimension C. Then securely tighten two setscrews 8 of the hook shaft base.

4. Turn the handwheel to bring so that needle bar

from the lowest dead point of its stroke to dimension A. At this time, turn the hook 7 in its normal rotational direction so that center of the needle 6 aligns with blade point of the hook 7.

5. Tighten clamping screw

6. Turn the handwheel to bring so that needle bar

from the lowest dead point of its stroke to dimension A. At this time, loosen clamping screw 4 of the needle bar holder to adjust so that the distance from the top end of the needle eyelet to blade point of the hook 7 is dimension B. Then tighten again the clamping screw 4 of the needle bar holder.

7. Set the stitch dial to the maximum and check that needle

does not come in contact with blade point of the hook 7. (For the dimension, refer to the respective models in the list.)

of the face plate to remove the face plate

is raised

of the needle bar holder.

to adjust so that the distance from the top

of the lower shaft set collar.

is raised

of the lower shaft set collar.

is raised

Results of Improper adjustment

Stitch skipping or thread break-

age will result.

Loose stitches will result.

3) Adjusting the hook needle guard

When a hook has been replaced, be sure to check the position of the hook needle guard !0.

1. As the standard position of the hook needle guard

needle guard !0 must push the side face of needle 6 to lean the needle by 0.05 to 0.2 mm away from its straight position.

2. If the state of the hook is not as shown above, t the hexagon

wrench !2 into the needle guard adjusting screw !1 and adjust as follows:

1) To bend the hook needle guard

needle guard adjusting screw !1 in direction D.

2) To bend the hook needle guard

needle guard adjusting screw !1 in direction E.

, the hook

in direction d, turn the

in direction e, turn the

– 9 –

(7) Lift of the presser foot

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

1) Hand lifter

[Conditions]

• State that the hand lifter is raised.

10 mm

– 10 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

1) Hand lifter

1. Loosen setscrews of the face plate to remove the face plate.

2. Loosen clamping screw

3. Adjust the lifting amount to 10 ± 1 mm in the state that the lifter

plate 3 is in contact with the spring receiving 2.

At this time, place a thing thickness of which is 10 mm between

the top surface of throat plate 4 and the under surface of

presser foot 5 to facilitate adjustment.

4. In the state as described in the aforementioned step 3, bring

hand lifter A 6 and B 7 into the state as illustrated in the gure

and tighten clamping screw 1 of the hand lifter A.

5. Remove the 10 mm thick thing placed between the top surface

of throat plate 4 and the under surface of presser foot 5.

6. Attach the face plate.

of the hand lifter A.

When the lifting amount is higher

than the specied value :

The presser foot is held raised

from the top surface of the throat

plate even when the hand lifter

is returned to its home position.

When the lifting amount is lower

than the specied value :

The presser foot is not suf-

ciently raised and the working

property may be deteriorated.

– 11 –

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

2) Knee lifter (Without thread trimmer only)

[Conditions]

• Lifting amount when stopper screw of knee lifter

rotation arm comes in contact with mahcine bed.

20 mm

Knee lifter rotation arm

– 12 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

2) Knee lifter (Without thread trimmer only)

1. Loosen setscrews of the face plate and the rear cover to re-

move the face plate and the rear cover.

2. Loosen clamping screw

3. Adjust the lifting amount to 19 to 20 mm in the state that the

lifter plate 3 is in contact with the spring receiving 2.

At this time, place a thing thickness of which is 20 mm between

the top surface of throat plate 4 and the under surface of

presser foot 5 to facilitate adjustment.

4. Move the knee lifter link C

state of step 3, and tighten clamping screw 1 of the knee lifter

connecting arm in the state that the knee lifter link C 6 is in

contact with screw 7 of the knee lifter connecting arm.

5. Remove the 20 mm thick thing placed between the top surface

of throat plate 4 and the under surface of presser foot 5.

6. Attach the face plate and the rear cover.

7. Remove the knee press plate and tilt the machine arm.

8. Loosen stopper nut

amount of stopper screw 9.

To use the machine with the amount of alternate vertical move-

ment is set at 6.5 mm or more, adjust that the height from the

top surface of throat plate 4 to the under surface of presser

foot 5 is 16 ± 0.5 mm.

(Step 7. to 8. is standard gauge type only.)

of the knee lifter connecting arm.

to the horizontal position in the

to adjust the lifting amount by screwing

When the lifting amount is higher

than the specied value :

The top end of the needle bar

interferes with the walking foot

and the walking foot may be

damaged when the presser foot

is raised.

When the lifting amount is lower

than the specied value :

The presser foot is not suf-

ciently raised and the working

property may be deteriorated

(Caution) 1. Check to be sure that parts of the knee lifter

mechanism does not come in contact with the

frame and other parts around it when the knee

lifter link C 6 is positioned horizontally.

If the knee lifter link C 6 comes in contact with

the aforementioned parts, loosen the thrust col-

lar setscrews and adjust the lateral position of

the link.

2. Tighten clamping screw 1 of the knee lifter con-

necting arm so that the knee lifter link C 6 is no

lateral play.

3. For the standard gauge type machine, the walk-

ing foot interferes with the needle bar when the

amount of the alternating vertical movement of

the walking foot and the presser foot is set at

6.5 mm or more. To use the machine with the

amount of the alternating vertical movement is

set at 6.5 mm or more, set the lifting amount of

the knee lifter at 16 ± 0.5 mm.

– 13 –

WARNING :

海外講習会用121122LU-2810(-7)EM

As the work is performed while the power is ON, never touch the switches other than the necessary one so as to prevent accidents caused by the malfunction of switches.

Standard adjustment

3) Automatic presser foot lifter (Machine with thread trimmer only)

20 mm

– 14 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

3) Automatic presser foot lifter (Machine with thread trimmer

only)

1. Turn the power ON. Carry out thread trimming once. Turn ON

the automatic presser foot lifter.

2. Remove rubber cap

Loosen clamping screw 6 of the automatic presser foot lifter

arm.

3. Adjust the lifting amount to 19 to 20 mm in the state that the

lifter plate 3 is in contact with the spring receiving 2.

At this time, place a thing thickness of which is 20 mm between

the top surface of throat plate 4 and the under surface of

presser foot 5 to facilitate adjustment.

4. Tighten clamping screw

arm in the state of step 3.

5. Remove the 20 mm thick thing placed between the top surface

of throat plate 4 and the under surface of presser foot 5.

6. Attach rubber cap

(Caution) For the standard gauge type machine, the walking

foot interferes with the needle bar when the amount

of the alternating vertical movement of the walking

foot and the presser foot is set at 6.5 mm or more.

To use the machine with the amount of the alternat-

ing vertical movement is set at 6.5 mm or more, set

the lifting amount of the automatic presser foot lifter

at 16 ± 0.5 mm.

from the rear face of the machine arm.

of the automatic presser foot lifter

from the rear face of the machine arm.

When the lifting amount is higher

than the specied value :

The top end of the needle bar

interferes with the walking foot

and the walking foot may be

damaged when the presser foot

is raised.

When the lifting amount is lower

than the specied value :

The presser foot is not suf-

ciently raised and the working

property may be deteriorated

– 15 –

(8) Feed momentum

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

1) Alternate momentum

[Conditions]

• Feed amount : 0 mm

• Amount of alternate vertical movement : 3 mm

Top surface of feed dog

Top surface of throat plate

(9) Needle sway (Adjusting the bottom feed amount)

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

10.9 ± 0.1 mm

– 16 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

1) Alternate momentum

1. Set the stitch dial to “0”.

2. Turn the handwheel to make sure that the amount of alternate

vertical movement of walking foot 1 and presser foot 2 is

almost equal.

3. When the amount of alternate vertical movement is not equal,

remove the rubber plug 3 on the rear face of machine arm.

Loosen clamping screw 4 of the top feed rear arm to adjust so

that the amount of alternate vertical movement can be unied.

Adjust the amount almost to A = B.

When the amount of alternate vertical movement of the walking

foot is larger than that of the presser foot :

1) Loosen clamping screw 4 of the top feed rear arm in the state

that walking foot 1 is raised a little, press walking foot 1

against the feed dog.

2) Re-tighten clamping screw 4 of the top feed rear arm and turn

the handwheel to make sure of the amount of alternate vertical

movement.

Adjust the amount of alternate verti-

cal movement of the walking foot 1

so that it is larger than that of the

presser foot 2 in accordance with

the sewing products.

Sewing sponge material or the

Sewing material with overlapped

sections

When the amount of alternate verti-

cal movement of the walking foot 1

and presser foot 2 are consider-

ably different :

The stitch pitch is different from

the value set by the dial.

Decrease the number of revolu-

tion of the motor a little since the

feed efciency is decreased.

Adjustment procedures

1. Loosen hinge screw 1 of the horizontal feed rear arm.

2. Move hinge screw nut 3 of the horizontal feed rear arm to ad-

just so that the distance from machined surface of the horizon-

tal feed rear arm 2 to notched part of the hinge screw nut 3

of the horizontal feed rear arm is 10.9 ± 0.1 mm. Then tighten

hinge screw 1 of the horizontal feed rear arm.

3. Turn the handwheel to check the needle sway.

(Standard) When the distance is lengthened more than the

standard adjustment value, the bottom feed amount

is decreased.

(Caution) When you desire to change the bottom feed amount,

re-adjust the needle entry position since the needle

entry position changes.

Results of Improper adjustment

Needle breakage or stitch skip-

ping will result.

– 17 –

(10) Feed cam timing

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

1) Horizontal feed cam timing

No. 2 screw

Standard adjustment

Main shaft

2) Vertical feed cam timing

[Conditions]

• Feed amount : maximum

• Needle bat at lowest dead point

Top end of needle

, top surface of

throat plate 5 and top surface of feed dog 6 are aligned.

Lower shaft

[Conditions]

• Feed amount : 6 mm

• When needle is lowered

and feed dog is rised.

– 18 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

1) Horizontal feed cam timing

1. Set the stitch dial to the maximum.

2. Loosen two setscrews

3. Turn the handwheel to bring the needle bar to the lowest dead

point of its stroke.

4. Turn the horizontal feed eccentric cam

so that the feed dog 6 no longer moves even when the re-

verse feed control lever is moved.

5. Securely tighten two setscrews

tric cam.

(Standard) The setscrew No. 2 of the horizontal feed eccentric

cam 2 faces almost right above at the lowest dead

point of the needle bar.

(Caution) 1. If the cam slips in the axial direction at the time

of adjustment, torque becomes heavy. So, be

careful.

2. After adjusting the horizontal feed timing, re-

adjust the top feed timing.

of the horizontal feed eccentric cam.

and adjust the timing

of the horizontal feed eccen-

Results of Improper adjustment

Pitch error at high or low speed

is apt to occur.

Needle thread tension will vary.

Stitch tightness at normal and

reverse feed will vary.

2) Vertical feed cam timing

1. Perform the adjustment after adjusting the horizontal feed tim-

ing.

2. Set the stitch dial to “6”.

3. Loosen two setscrews 3 of the vertical feed cam.

4. Turn the vertical feed cam 7 to the position where top end of

the needle 4 aligns with top surface of the throat plate 5, and

top surface of the throat plate 5 aligns with feed dog 6.

5. Tighten two setscrews 3 of the vertical feed cam.

(Standard) When three points of top end of the needle 4, top

surface of the throat plate 5 and top surface of feed

dog 6 are aligned with one another, the setscrew

No. 1 of the vertical feed cam 7 faces almost right

below for the sewing machine.

Improper stitch length may result

when the machine is operated at

high or low speed.

When the vertical feed cam 7 is

xed after turning it toward the

operator (in the direction of ar-

row A) from the standard adjust-

ment position, the feed driving

timing will be advanced. When

the vertical feed cam 7 is xed

after turning it away from the op-

erator (in the direction of arrow

B) from the standard adjustment

position, the feed driving timing

will be retarded.

– 19 –

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

3) Top feed cam timing

Main shaft

Standard adjustment

[Conditions]

• Feed amount : 6 mm

• Amount of alternate vertical movement : 3 mm

• When needle and walking foot is lowered.

Top end of needle 2, top surface of throat plate 3, under surface of walking foot 4 and top surface of feed dog 5 are aligned.

– 20 –

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

3) Top feed cam timing

1. Set the stitch dial to “6”.

2. Set the alternate vertical dial to “3”.

3. Loosen setscrews of the top cover to remove the top cover.

4. Loosen two setscrews

5. Turn the top feed cam

top end of the needle 2, top surface of the throat plate 3,

under surface of walking foot 4 and top surface of feed dog

are aligned with one another under the condition that the

amount of alternate vertical movement is equal.

6. Tighten two setscrews

7. Attach the top cover.

(Standard) When four points of top end of the needle 2, top

surface of the throat plate 3, under surface of

walking foot 4 and top surface of feed dog 5 are

aligned with one another, the setscrew No. 2 of the

top feed cam 6 is visible from the position between

the alternate vertical change base and the machine

frame.

of the top feed cam.

to the position where four points of

of the top feed cam.

Results of Improper adjustment

Pitch error at high or low speed

is apt to occur.

– 21 –

– 22 –

(11) Stitch length of forward/reverse feed

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

Notched part

(12) Position of the reverse feed control lever

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

In case of LU-2810-7

[Conditions]

• Feed amount : 6 mm

In case of LU-2810

0.1 to 0.5 mm

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

1. Set the stitch dial to “6”.

2. Loosen two setscrews 1 of the feed adjusting eccentric pin.

3. Turn feed adjusting eccentric pin 2 to adjust the stitch length.

o Direction A

o Direction B

4. After the adjustment, securely tighten two setscrews 1 of the

feed adjusting eccentric pin.

(Standard) When the direction of notched part of the feed

adjusting eccentric pin 2 is set to just above as

shown in the illustration, the feed amounts of nor-

mal and reverse feeds are nearly the same.

Reverse feed pitch is increased.

→

Normal feed pitch is increased.

→

Adjustment procedures

Respective stitch lengths of

normal and reverse feeds do not

match.

Results of Improper adjustment

In case of LU-2810-7

1. Set the stitch dial to the maximum.

2. Loosen clamping screw

3. Adjust so that a play of top end

lever 2 is 1 ± 0.5 mm. Then tighten clamping screw 1 of the

reverse feed connecting arm.

In case of LU-2810

1. Set the stitch dial to the maximum.

2. Loosen clamping screw

arm.

3. Turn the reverse feed lever shaft

ance between the reverse feed lever plate 4 and the stopper

part B of machine arm is 0.1 to 0.5 mm. Then tighten clamping

screw 3 of the feed adjusting pin support arm.

(Caution) Check that the reverse feed control lever 2 does not

interfere with the machine bed or machine arm when

the stitch dial is set to the maximum.

of the reverse feed connecting arm.

of the reverse feed control

of the feed adjusting pin support

to adjust so that a clear-

When the position of the reverse

feed control lever 2 is low :

Reverse feed lever plate

interferes with the machine

arm and the stitch length of the

reverse feed stitching will be

decreased.

When the position of the reverse

feed control lever 2 is high :

Reverse feed lever plate

terferes with the stopper part B

of machine arm, or reverse feed

control lever 2 interferes with

machine arm, and stitch length

of the normal feed stitching will

be decreased.

in-

– 23 –

– 24 –

(13) Safety clutch

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

* Standard of release pressure

(14) Balancer

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Operator's side

Standard adjustment

Operator's side

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

The safety clutch functions when an excessive load is applied to the

lower shaft or the like during sewing. When the safety clutch functions, the hook will not rotate even if turning the handwheel, and the lower shaft sprocket wheel 4 only will run idle since the power is not transmitted to the lower shaft.

Resetting procedure

1. Checking the moving part of the sewing machine, and look for

and remove the cause which the safety clutch has functioned.

2. Pressing push button

chine bed, strongly turn the handwheel in the reverse direction of rotation.

3. Resetting procedure completes when the handwheel cannot be

turned with “click”.

Adjusting the working torque of the safety clutch

1. Tilt the machine head.

2. Loosen setscrew

sprocket wheel 4 and turn release pressure adjusting pin 3 to adjust the release torque. After the adjustment, tighten setscrew 2 to x release pressure adjusting pin 3.

* Standard of release pressure

When the direction of the slot in release pressure adjusting pin

is located near the places below, the relevant release pres-

sure is obtained.

24.5 N • m : Top of tooth of 1st sprocket

9.8 N • m : Center of bottom between 2nd and 3rd sprockets

5.9 N • m : Top of tooth of 3rd sprocket

located on the top surface of the ma-

located at the periphery of lower shaft

Results of Improper adjustment

Adjustment procedures

1. Loosen setscrews of the face plate to remove the face plate.

2. Turn the handwheel so that the counterweight 1 faces toward

you.

3. Place the balancer 2 in the position shown in the gure.

At this time, make a clearance so that the balancer 2 do not

interfere with machine frame, top feed changing base 3 and

connecting link 4.

4. Evenly and securely tighten two setscrews 5 of balancer.

Results of Improper adjustment

Vibration becomes big.

– 25 –

– 26 –

(15) Reverse feed cylinder

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

8 ± 0.5 mm

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

1. Set the stitch dial to the maximum.

2. Loosen clamping screw

3. Operate the reverse feed control lever to adjust so that the dis-

tance between the cylinder support 3 and the cylinder knuckle

is 8 ± 0.5 mm in the state that the bottom of elongated hole

of the reverse feed link 1 is in contact with the hinge screw 2.

Then tighten clamping screw 5 of reverse feed arm.

of the reverse feed arm.

Stitch lengths of the reverse feed

may not be obtained.

– 27 –

– 28 –

(16) Lubrication

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

A sheet of paper

Max

Min

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Lubrication procedure

1. Add oil from section D.

2. If the pointer of oil gauge 6 drops below Min line, lubricate

again.

(Caution) Adjust the oil quantity so that the pointer of oil gauge

stays between Max and Min.

Adjusting the amount of oil in the hook

1. Remove rubber cap 7.

2. Loosen nut 8 and turn oil amount adjustment screw 9 to ad-

just the amount of oil in the hook.

Turning the screw clockwise A will decrease the amount of oil

in the hook or counterclockwise B will increase it.

3. The appropriate amount of oil, when a sheet of paper is placed

near the periphery of the hook, is to such an extent that splash-

es of oil from the hook appear in approximately ve seconds as

shown in a sheet of paper.

Results of Improper adjustment

When the amount of oil is short :

Loose stitches will result.

Hook is heated resulting in sei-

zure.

When the amount of oil is too much :

Thread is stained with oil. In ad-

dition, the cloth may be stained.

Trouble of sewing will be

caused.

Cleaning the oil pan and lter

1. Remove clips 5 to remove lter clamp 4.

2. Remove lter 3 and oil pipe 1.

3. Clean up lter 3 and oil reservoir C of the oil pan 2.

4. Insert the oil pipe 1 and lter 3 into oil reservoir C of the oil

pan 2.

5. Set the lter clamp 4 to oil pan 2, and x it with the clip 5.

6. Pour the JUKI New Defrix Oil No. 1 into the oil tank.

(Caution) Adjust the oil quantity so that the pointer of oil gauge

stays between Max and Min.

Cleaning the oil lter

1. Remove metal xture

2. Remove lter holder

3. Clean up lter

(Caution) 1. Be sure to clean up the oil pan

approximately

once a month.

2. If lters

and !2 is clogged with soil, lubrica-

tion fails resulting in trouble.

– 29 –

– 30 –

(17) Thread trimmer device

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

1) Position of the counter knife and the clamp spring

Mounting groove of the slide plate

37 ± 0.1 mm (A)

To be in contact

3.7 ± 0.1 mm (B)

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

1) Position of the counter knife and the clamp spring

[Position of the counter knife]

1. Loosen setscrews

2. Press the edge of counter knife

of the counter knife.

against the step difference

of counter knife base 2.

3. Adjust so that the distance from mounting groove of the slide

plate to top end of the counter knife 3 is 37 ± 0.1 mm (A).

4. Tighten setscrews

of the counter knife.

[Position of the clamp spring]

1. Loosen setscrews

2. Press the edge of clamp spring

of the clamp spring.

against the step difference

of counter knife base 2.

3. Slide the clamp spring

while making it press against the step

difference of the counter knife base 2, and adjust the distance

to 3.7 ± 0.1 mm (B).

4. Tighten setscrews

of the clamp spring.

(Caution) When the position of counter knife 3 and clamp

spring 5 is moved, re-adjust the position of counter

knife base 2 and the knife pressure.

When dimension A is larger :

Length of bobbin thread clamp

is shortened and stitch skipping

occurs.

Setting/taking out bobbin cannot

be performed.

When dimension A is smaller :

Thread trimming failure will be

caused.

When dimension B is larger :

Bobbin thread clamp failure oc-

curs.

Stitch skipping at the start of

sewing will be caused.

When dimension B is smaller :

It is difcult to take out cloth

since needle thread have been

clamped, and the trouble that

bobbin thread clamp is simulta-

neously removed will be caused.

Clamp spring interferes with the

rear edge of moving knife. As

a result, deformation of clamp

spring or the like occurs.

– 31 –

– 32 –

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

2) Position of the counter knife base

To be in contact

1.2 to 1.5 mm (C)

3) Vertical position of the moving knife

0.3 to 0.4 mm

Adjust at the center part.

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

2) Position of the counter knife base

1. Loosen setscrews

2. Move the counter knife base

of the counter knife base.

to the position as shown in the

gure.

For the longitudinal position, press the edge of counter knife

base 2 against the step difference of the hook shaft base 4.

For the lateral direction, adjust so that the distance from the

throat plate to the counter knife is 1.2 to 1.5 mm (C), then

tighten setscrews 1 of the counter knife base.

(Caution) When the counter knife base 2 is moved, re-adjust

the knife pressure.

When dimension C is larger :

Knife pressure is increased. As a

result, motor stop will be caused.

Setting/taking out bobbin cannot

be performed.

Counter knife base interferes

with the rear end of moving

knife. As a result, moving knife

and counter knife 3 will be bro-

ken.

When dimension C is smaller :

Knife pressure is decreased. As

a result, thread trimming failure

occurs.

Moving knife interferes with the

hook stopping section. As a

result, thread trimming failure oc-

curs or moving knife is broken.

3) Vertical position of the moving knife

1. Loosen clamping screw

2. Loosen setscrews

of the moving knife driving arm.

of the moving knife shaft thrust collar.

3. Adjust so that the clearance between the center part of bottom

end of moving knife 8 and inner hook 9 is 0.3 to 0.4 mm, then

tighten setscrews 7 of the moving knife shaft thrust collar.

4. Tighten clamping screw

of the moving knife driving arm so

that there is no thrust play at the moving knife shaft !0.

(Caution) Adjust the height of moving knife 8 at the center part

of moving knife 8.

When the clearance is larger :

Clamp failure of needle thread

and bobbin thread occurs.

When the clearance is smaller :

Moving knife

interferes with

the inner hook 9.

There is no clearance where

thread enters between moving

knife 8 and inner hook 9. As

a result, thread trimming failure

will be caused.

– 33 –

– 34 –

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

4) Thread trimmer cam timing

Standard adjustment

Most advanced position of moving knife

[Conditions]

• Two marker dots on the handwheel aligns with

marker line on the motor cover.

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

4) Thread trimmer cam timing

1. Loosen setscrews

2. Move the moving knife

3. Turn the handwheel

dots A on the handwheel 2 aligns with marker line B on the

motor cover 3.

4. Make the thread trimmer cam

lower shaft set collar 5, then tighten setscrews 6 of the thread

trimmer cam.

(Caution) Check that the edge of thread trimmer cam 4 comes

in close contact with the edge of lower shaft set col-

lar 5.

of the thread trimmer cam.

to most advanced position.

in the state of step 2. to two marker

come in close contact with the

When thread trimming timing is

retarded :

Thread trimming action does not

complete even at the needle-

up stop position. As a result,

defective thread trimming will be

caused.

When thread trimming timing is

advanced :

Defective thread trimming will be

caused.

Length of thread remaining on

the needle after thread trimming

cannot be secured. As a result,

needle thread may slip off after

thread trimming or at the start of

sewing.

Stitch skipping at the start of

sewing will be caused.

– 35 –

– 36 –

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

5) Position of the thread trimmer cam

0.1 ± 0.05 mm

6) Adjusting the knife pressure

Knife pressure

6 to 7 mm

Initial position

2 ± 0.5 mm

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

5) Position of the thread trimmer cam

1. Loosen setscrews

of the thread trimmer cam and clamping

screw 7 of the lower shaft set collar.

2. Set the thread trimmer solenoid to initial position.

3. Adjust so that the clearance between the thread trimmer cam

roller !0 and dwell section of the thread trimmer cam !1 is 0.1

± 0.05 mm in the state that the moving knife driving arm link 8

is in contact with the moving knife driving arm roller 9. Then

tighten setscrews 6 of the thread trimmer cam.

4. Make the lower shaft set collar

come in close contact with

the thread trimmer cam !1, then securely tighten clamping

screw 7 of the lower shaft set collar.

6) Adjusting the knife pressure

Knife pressure

1. Loosen setscrews

2. Adjust the installing position of the moving knife

of the moving knife.

so that the

position where moving knife 2 and counter knife 3 start com-

ing in contact with each other starts at the position of 6 to 7 mm

from the top end of the moving knife 2.

At this time, if moving knife 2 comes in contact with the clamp

spring, the knife pressure is increased by the clamp pressure.

So, adjust the knife pressure in the state that the clamp pres-

sure is not applied to the knife.

3. Tighten setscrews

of the moving knife.

(Caution) Operate the sewing machine with the knife pressure

minimized to such an extent that both needle and

bobbin threads can be trimmed.

Initial position

1. Loosen clamping screw

of the moving knife driving arm.

2. Adjust so that the distance between the top end of the counter

knife 3 and the top end of the moving knife 2 is 2 ± 0.5 mm

when moving knife 2 travels to its back end.

3. Tighten clamping screw

of the moving knife driving arm so

that there is no thrust play at the moving knife shaft 5.

When there is no clearance be-

tween the thread trimmer cam !1

and the thread trimmer cam roller

Thread trimmer cam

inter-

feres with the thread trimmer

cam roller !0 resulting in break-

age or machine lock.

When the clearance between the

thread trimmer cam !1 and the

thread trimmer cam roller !0 is

large :

Defective thread trimming will

result.

When the knife pressure is high :

Blade sections of the counter

knife 3 and the moving knife 2

may be damaged.

Torque at the time of thread trim-

ming is increased resulting in

motor-stop.

Defective thread trimming opera-

tion will result.

When the knife pressure is low :

Defective thread trimming will

result.

– 37 –

– 38 –

(18) Detection switch of the amount of alternate vertical movement

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Standard adjustment

Sewing speed of LU-2810-7

Amount of alternate vertical

movement

Stitch length : 7 mm or less

Less than 3 mm 3,000 sti/min 2,000 sti/min

3.25 mm to less than 4 mm 2,400 sti/min 2,000 sti/min

4.25 mm to less than 5 mm 2,000 sti/min 2,000 sti/min

5.25 mm to less than 9 mm 1,800 sti/min 1,800 sti/min

Stitch length : More than 7 mm

and 9 mm or less

0.4 ± 0.1 mm

Green

Red

White

Scale of alternate

vertical dial

3.25 to 4 OFF ON

4.25 to 5 ON ON

5.25 to 9 ON OFF

Black

Switch (upper)

(Red and green lines)

Switch (lower)

(White and black lines)

1 to 3 OFF OFF

Adjustment procedures

海外講習会用121122LU-2810(-7)EM

Results of Improper adjustment

1. Turn the alternate vertical dial 1 to adjust the scale between

"7.5" to "8".

2. Loosen setscrews of the top cover to remove the top cover.

3. Loosen installing screws 2 of the detection switch of the

amount of alternate vertical movement, and adjust so that the

distance between the detection switch of the amount of alter-

nate vertical movement 3 to the alternate vertical dial 1 is 0.4

± 0.1 mm.

4. Then tighten installing screws 2 of the detection switch of the

amount of alternate vertical movement.

(Caution) When the position of the detection switch of the

amount of alternate vertical movement 3 is changed,

check whether the relation between the alternate ver-

tical dial 1 and the sewing speed is normal.

Sewing speed may not change

even when turning the alternate

vertical dial 1.

– 39 –

3. Portion to which LOCKTITE is applied

海外講習会用121122LU-2810(-7)EM

LOCKTITE has been applied to the following parts at the time of assembly at the factory.

Avoid disassembling these parts to the most. When an assembly which includes the aforementioned parts

has been forced to be disassembled, be sure to wash the LOCKTITE applied part using a paint thinner or the

like, and reassemble it using LOCKTITE after removing any moisture from the mating faces.

If it is hard to remove a part which has been xed using LOCKTITE, heat it using a torch lamp or the like to

help remove the part.

No. Portion to which LOCKTITE is applied Part No. LOCKTITE No.

1 Set screw of coupling SM8050812TP LOCKTITE #243

No. 1

Coupling

Setscrews of coupling

LOCKTITE applied

– 40 –

4. Selective parts and consumable parts

海外講習会用121122LU-2810(-7)EM

Selective parts

Part name Part No. Remarks

Hook shaft selective washer B255728000A t=1.15 to 1.2 mm

Hook shaft selective washer B255728000B t=1.05 to 1.1 mm

Hook shaft selective washer B255728000C t=0.9 to 0.95 mm

Hook shaft selective washer B255728000D t=0.8 to 0.85 mm

Hook shaft selective washer B255728000E t=0.975 to 1.025 mm

Consumable parts

Part name Part No. Remarks Model

Needle M13517B1600 GROZ-BECKERT 135 x 17 Nm 160 LU-2810, LU-2810-7

Hook (asm.) 40131956 LU-2810-7

Hook (asm.) 40126399 LU-2810

Bobbin 21334800 Aluminum bobbin (with knurl)

Moving knife 21389200 LU-2810-7

Counter knife 21389309 LU-2810-7

Clamp spring 21389408 LU-2810-7

– 41 –

– 42 –

5. Applying grease

海外講習会用121122LU-2810(-7)EM

(1) Applying grease

For the safe usage of a sewing machine, periodically apply a grease (once every 2 or 3 years for standard)

to the application spots specied for each model, by means of a cotton applicator or the like. For using the

SC-922, an alarming sound is generated when the time for grease-up comes. When this alarming is heard, a

grease-up action has to be taken.

(Caution) 1. Never feed oil to the grease-up spots.

2. It must be noted that too much grease application may result in grease leakage from

the thread take-up lever cover section or the needle bar.

(2) Greasing points

1) Needle bar rocking base

1. Remove face plate.

2. Remove rubber plugs 1.

3. Fill grease holes with JUKI Grease A.

4. Attach rubber plugs 1.

5. Wipe off grease that was exposed.

6. Attach face plate.

Needle bar

Slide block

Felt

2) Alternate vertical change base

海外講習会用121122LU-2810(-7)EM

1. Remove top cover.

2. Remove two return springs

3. Loosen setscrews

of felt clamp to remove felt clamp 2.

4. Apply JUKI grease A to felt

5. Apply JUKI grease A to sliding surfaces of alternate vertical change base and feed conversion link.

6. Set felt clamp

to alternate vertical change base, and x it with setscrews 1 of felt clamp.

7. Attach two return springs

8. Attach top cover.

of alternate vertical change base.

4

3) Horizontal feed change base

1. Remove rear cover.

2. Loosen setscrews 1 of felt clamp to remove felt clamp 2.

3. Apply JUKI grease A to felt 3.

4. Apply JUKI grease A to sliding surfaces of horizontal feed change base and feed conversion link.

5. Set felt clamp 2 to horizontal feed change base, and x it with setscrews 1 of felt clamp.

6. Attach rear cover.

– 43 –

– 44 –

4) Greasing point indication drawing

海外講習会用121122LU-2810(-7)EM

(* Indicating the points where grease is applied at shipment.)

: JUKI Grease A

: Unirex N3

: Barch L1002

1. MAIN SHAFT & THREAD TAKE-UP LEVER COMPONENTS

2. NEEDLE BAR COMPONENTS

海外講習会用121122LU-2810(-7)EM

– 45 –

– 46 –

3. HOOK & OPENNER COMPONENTS

海外講習会用121122LU-2810(-7)EM

4. UPPER FEED COMPONENTS

海外講習会用121122LU-2810(-7)EM

– 47 –

– 48 –

5. HAND LIFTER & AUTO LIFTER COMPONENTS

海外講習会用121122LU-2810(-7)EM

6. KNEE LIFTER COMPONENTS (FOR LU-2810)

7. LOWER FEED COMPONENTS

海外講習会用121122LU-2810(-7)EM

– 49 –

– 50 –

8. FEED ADJUST COMPONENTS

海外講習会用121122LU-2810(-7)EM

9. DL COMPONENTS (FOR LU-2810-7)

海外講習会用121122LU-2810(-7)EM

10. AUTO BT COMPONENTS (FOR LU-2810-7)

– 51 –

– 52 –

11. THREAD TRIMMING COMPONENTS (FOR LU-2810-7)

海外講習会用121122LU-2810(-7)EM

12. THREAD TENSION COMPONENTS

海外講習会用121122LU-2810(-7)EM

– 53 –

– 54 –

13. TENSION RELEASE COMPONENTS (FOR LU-2810-7)

海外講習会用121122LU-2810(-7)EM

14. BOBBIN WINDER COMPONENTS

海外講習会用121122LU-2810(-7)EM

– 55 –

6. Engraved marker dots on the handwheel (for the machine with thread

海外講習会用121122LU-2810(-7)EM

trimmer only)

UP stop position

(One marker dot)

Adjustment of thread

trimmer cam

(Two marker dots)

Adjustment of opener timing

(Three marker dots)

– 56 –

7. Lubrication route diagram

海外講習会用121122LU-2810(-7)EM

– 57 –

Oil tank

Oil regulating valve

Pump

To oil pan

To hook

Oil lter

To hook shaft gear

: Lubrication

: Circulation

8. Machine head wiring (for the machine with thread trimmer only)

海外講習会用121122LU-2810(-7)EM

(1) Connectors coming from machine head (Connect to control box)

CN36 : 14P connector

Pin No. Part name Remarks

1 Thread release solenoid (lower side) 2 Thread release solenoid (upper side) 3 — — 4 Knee switch 5 Reverse feed switch 6 Thread trimmer solenoid (left side) 7 Thread trimmer solenoid (right side) 8 Thread release solenoid (lower side) +27V

9 Thread release solenoid (upper side) +27V 10 FG FG 11 Knee switch GND 12 Reverse feed switch GND 13 Thread trimmer solenoid (left side) +27V 14 Thread trimmer solenoid (right side) +27V

CN44 : 24P connector

Pin No. Part name Remarks

1 6-operation switch +5V

2 6-operation switch +5V

3 — +12V

4 6-operation switch Alternate vertical movement switch

5 6-operation switch Automatic reverse feed stitching cancellation switch

6 6-operation switch Needle up/down switch

7 6-operation switch 2-pitch changeover switch

8 6-operation switch Tension release (upper side) opening switch

9 6-operation switch —

10 6-operation switch Fall detection sensor

11 6-operation switch —

12 6-operation switch GND 13 6-operation switch GND 14 — — 15 6-operation switch Alternate vertical movement state monitor output 16 6-operation switch Automatic reverse feed stitching cancellation state monitor output 17 6-operation switch Needle up/down correction operation output 18 6-operation switch 2-pitch state output 19 6-operation switch Tension increasing state monitor output 20 — — 21 — — 22 — — 23 — — 24 — —

CN37 : 2P connector

Pin No. Part name Remarks

1 — — 2 — +27V

– 58 –

海外講習会用121122LU-2810(-7)EM

CN58 : 22P connector

Pin No. Part name Remarks

1 — +5V

2 — GND

3 — +5V

4 — GND

5 — +5V

6 — GND

7 — +12V

8 Alternate vertical movement

limit switch

9 — +24V 10 — GND 11 — +24V 12 — GND 13 — 14 — 15 Alternate vertical movement

limit switch (lower side)

16 Alternate vertical movement

limit switch (upper side) 17 — 18 — 19 — 20 — 21 — 22 —

GND

CN59 : 26P connector

Pin No. Part name Remarks

1 Solenoid valve +24V 2 Solenoid valve +24V 3 Solenoid valve +24V 4 — +24V 5 Solenoid valve +24V 6 — +24V 7 — +24V 8 — +24V

9 — +24V 10 — +24V 11 Solenoid valve Presser lifting cylinder 12 Solenoid valve Reverse feed cylinder 13 Solenoid valve Alternate vertical movement cylin-

der 14 — — 15 Solenoid valve 2-pitch cylinder 16 — — 17 — — 18 — — 19 — — 20 — — 21 — — 22 — — 23 — — 24 — — 25 — — 26 — —

(2) Connectors that are connected in the head cover

CN100 : 14P connector

Pin No. Part name Remarks

1 Thread release solenoid (lower side) 2 Thread trimmer solenoid (right side) 3 Thread release solenoid (upper side) 4 Thread trimmer solenoid (left side) 5 Reverse feed switch GND 6 — — 7 — — 8 Thread release solenoid (lower side) +27V

9 Thread trimmer solenoid (right side) +27V 10 Thread release solenoid (upper side) +27V 11 Thread trimmer solenoid (left side) +27V 12 — — 13 Reverse feed switch 14 — —

CN102 : 12P connector

Pin No. Part name Remarks

1 Solenoid valve Presser lifting cylinder 2 Solenoid valve Reverse feed cylinder 3 Solenoid valve Alternate vertical move-

4 — — 5 Solenoid valve 2-pitch cylinder 6 — — 7 Solenoid valve +24V 8 Solenoid valve +24V

9 Solenoid valve +24V 10 — — 11 Solenoid valve +24V 12 — —

ment cylinder

– 59 –

9. Troubles and corrective measures

海外講習会用121122LU-2810(-7)EM

(1) With regard to sewing

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

– 60 –

1. Thread breakage 1-1) Thread path, needle point, hook blade point or innerhook resting groove on the throat plate has sharp edges or burrs.

2. Thread is worn out. 2-1) Needle thread tension is too high.

2-2) Needle comes in contact

with the blade point of hook.

2-3) Clearance of inner hook

guide is too large.

2-4) Amount of oil in the hook is

insufcient.

2-5) Trimmed with the tooth of

the feed dog.

1-A) Check the sharp edge or burr

on the respective parts.

2-A) Check the clearance. Refer to “2.-(6) Needle-to-hook timing”.

3-A) Check the clearance. Decrease the clearance.

4-A) Check the amount of oil in

the hook.

5-A) Check the feed dog. Provide a groove behind the feed dog needle

5-B) Check the alternate vertical

movement.

5-C) Check the sewing speed. Reduce the sewing speed.

Remove the sharp edges or burrs on the blade

point of hook using a ne emery paper.

Buff up the groove section on the throat plate. Replace the needle with a new one.

Adjust the needle thread tension.

Refer to “2.-(5) Adjusting the inner hook guide”.

Adjust the amount of oil in the hook. Refer to “2.-(16) Lubrication”.

hole.

Reduce the amount of alternate vertical movement.

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

– 61 –

3. Needle thread trails 2 to 3 cm from

the wrong side of the fabric.

3-1) Needle thread tension is too

low.

3-2) Thread take-up spring works

excessively or the stroke of

the spring is too small.

3-3) Feed timing is not proper. Refer to “2.-(8) Feed cam timing”.

3-4) Timing between the needle

and the hook is excessively

advanced or retarded.

3-5) Thread melts due to needle

heat.

3-6) Amount of oil in the hook is

excessive.

* Use separately available parts below :

• 21144308 Needle thread lubricator

• B1114012000 Thread guide rod

• B91351230B0 Silicon oiler

4-A) Check the specied dimen-

sion.

6-A) Check the amount of oil in

the hook.

Adjust the needle thread tension. (This trouble occurs a lot when using synthetic threads.

Decrease the tension of of the thread take-up spring and increase the stroke of the spring.

Refer to “2.-(6) Needle-to-hook timing”.

Decrease the sewing speed. Use silicon oil. (Refer to * below.)

Adjust the amount of oil in the hook. Refer to “2.-(16) Lubrication”.

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

– 62 –

4. Stitch skipping 4-1) Clearance between the needle and the blade point of hook is too large.

4-2) Needle-to-hook timing is

excessively advanced or

retarded.

4-3) Presser foot is rising. (Pres-

sure of the presser foot is too low.)

4-4) Height of the needle bar is

improper.

4-5) Blade point of the hook is

blunt.

4-6) Improper type of needle is

used.

4-7) Hook needle guard is not

unctioned.

4-8) Thread take-up spring

excessively works or the

stroke of the spring is too small.

1-A) Check the clearance. Refer to “2.-(6) Needle-to-hook timing”.

2-A) Check the specied dimen-

sion.

3-A) Check the pressure of the

presser foot.

4-A) Check the lowest point of the

needle bar.

5-A) Check the blade point of the

hook.

7-A) Check the functional amount

of the needle guard.

Refer to “2.-(6) Needle-to-hook timing”.

Tighten the presser spring regulator.

Refer to “2.-(6) Needle-to-hook timing”.

Correct the blade point of the hook or replace the hook with a new one.

Replace the needle with one which is thicker than the current needle by one count.

Refer to “2.-(6) Needle-to-hook timing”.

Decrease the tension of the thread take-up spring and increase the stroke of the spring.

4-9) Feed timing is not proper. Refer to “2.-(8) Feed cam timing”.

4-10) Needle thread tension is too

high.

Adjust the needle thread tension.

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

– 63 –

5. Loose stitches (Balloon stitches or

isolated idling loop)

5-1) Clearance between the

inner hook guide and the protruding section of inner hook is too large.

5-2) Thread paths have been

poorly nished.

5-3) Bobbin fails to move

smoothly.

5-4) Thread is not well tightened

in the reverse feed.

5-5) Height of the feed dog is too

high.

5-6) Feed timing is excessively

advanced.

5-7) Hard-to-slip thread is used. Use silicon oil. (Refer to * below.)

* Use separately available parts below :

• 21144308 Needle thread lubricator

• B1114012000 Thread guide rod

• B91351230B0 Silicon oiler

1-A) Check the clearance. Refer to “2.-(5) Adjusting the inner hook guide”.

2-A) Check the nish of the re-

spective thread paths.

3-A) Check the change of bobbin

thread tension.

4-A) Walking foot is not of top-

divided type.

5-A) Compare the height with the

standard value.

Finish using a ne emery paper or buff.

Replace the bobbin or the hook with new ones.

Use the optional walking foot and presser foot.

Refer to “2.-(3) Height of the feed dog”.

Lower the height by 0.2 mm than the standard value.

Retard the feed timing.

6. Loose stitches (Needle thread

rises.)

6-1) Needle thread has not been

fully pulled up.

Increase the needle thread ension.

Use the optional walking foot. (Top-divided type)

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

– 64 –

7. Irregular stitches 7-1) Stroke of the thread take-up spring is improper.

7-2) Thread paths have been

poorly nished.

7-3) Bobbin fails to move

smoothly.

7-4) Bobbin thread tension is too

low.

7-5) Bobbin has been wound too

tight or too weak.

7-6) Direction of setting bobbin is

reverse.

8. Loose stitches at the time of corner

stitching

Adjustment of the thread take-up spring

Decrease the tension of the thread take-up spring and decrease the stroke of the spring to improve irregular stitches.

8-1) Needle thread on the stop-

ping side is drawn out more than is necessary.

1-A) Check the stroke of the

thread take-up spring.

2-A) Check the nish of the re-

spective thread paths.

3-A) Check the change of bobbin

thread tension.

5-A) Check the state of bobbin

winding.

6-A) Check the setting. Properly set the bobbin.

1-A) Check the stroke of the

thread take-up spring.

1-B) Check the hook timing. Retard the hook timing.

Adjust the thread take-up spring to move to ap-

proximately 1 mm from the initial position when hook draws thread maximumly.

Finish with a ne emery paper or buff.

Replace the bobbin or the hook with new ones.

Increase the tension of the bobbin thread.

Decrease or increase the tension applied to the bobbin winder.

In crease the stroke of the thread take-up spring.

Use the optional walking foot. (Top divided type)

(2) With regard to thread trimming

海外講習会用121122LU-2810(-7)EM

WARNING :

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

1. One or several stitches skip at the start of sewing.

– 65 –

1-1) Thread remaining at the needle top

after thread trimming is short.

1-2) Bobbin thread is not clamped. 2-A) Position of the clamp spring. Refer to “2.-(17)-1) Position of the counter knife and

1-A) Check the routing of needle thread. Thread the needle thread correctly.

Adjust so that abnormal needle thread tension is not applied.

1-B) Thread tension given by the tension con-

troller No.1 is too high.

1-C) Check the rising amount of the thread

tension disk No.2 at the time of thread trimming.

1-D) Thread trimmer timing is excessively

advanced.

1-E) There are scratches on the moving knife

and the hook.

1-F) Presser foot drops from cloth at the time

of thread trimming.

2-B) Pressure of the clamp spring is too low. Refer to “2.-(17)-1) Position of the counter knife and

2-C) There are scratches on the clamp spring. Replace the clamp spring with a new one.

2-D) Needle thread removes bobbin thread. Increase or decrease the tension of the tension con-

Decrease the tension given by the tension controller No.1.

Adjust so that the disk is raised by means of the thread release solenoid.

Refer to “2.-(17)-6) Thread trimmer cam timing”.

Polish with buff or replace the part with a new one.

Perform thread trimming on cloth.

the clamp spring”.

troller No.1.

1-3) Needle is too thick. Replace the needle with a thinner one.

1-4) Needle hole in the feed dog is too large. Replace the feed dog with small needle hole.

1-5) Pressure of the presser foot is too low. Increase the pressure of the presser foot.

1-6) Stitches are too small. Do not pass thread through the thread presser sec-

tion of the thread guide on the needle bar.

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

2. Thread slips off the needle eyelet.

3. Defective thread trimming

– 66 –

2-1) Needle thread slips off the needle eye-

let immediately after thread trimming.

2-2) Needle thread slips off the needle eye-

let at the start of sewing.

3-1) Thread cannot be trimmed. 1-A) The blades of moving knife and counter

3-2) Thread remains uncut after thread trim-

ming.

1-A) Check whether the needle thread re-

maining at the needle top after thread trimming is short.

2-A) Check whether the needle thread re-

maining at the needle top at the start of sewing is short.

2-B) Hard-to-slip thread is used. Decrease the number of times of threading needle

knife have been improperly adjusted.

1-B) The blades of moving knife and counter

knife have worn out or broken.

1-C) Pressure of the counter knife is insuf-

cient.

1-D) Presser foot drops from cloth at the time

of thread trimming.

2-A) The blades of moving knife and counter

knife have been improperly adjusted.

2-B) The blades of moving knife and counter

knife have worn out or broken.

Refer to the cause of previous section “Needle thread remaining at the needle top after thread trimming is short”.

thread.

Refer to “2.-(17)-4) Adjusting the knife pressure” and “2.-(17)-1), 2) and 3) Position of the moving knife and Position of the counter knife”.

Replace the moving knife and counter knife with new ones.

Refer to “2.-(17)-4) Adjusting the knife pressure”.

Perform thread trimming on cloth.

Refer to “2.-(17)-4) Adjusting the knife pressure” and “2.-(17)-1), 2) and 3) Position of the moving knife and Position of the counter knife”.

Replace the moving knife and counter knife with new ones.

To the next page

2-C) Thread trimmer timing is excessively

retarded.

2-D) Pressure of the counter knife is insuf-

cient.

2-E) Presser foot drops from cloth at the time

of thread trimming.

Refer to “2.-(17)-6) Thread trimmer cam timing”.

Refer to “2.-(17)-4) Adjusting the knife pressure”.

Perform thread trimming on cloth.

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

From the previous page

3-3) Moving knife stops during operation. 3-A) Thread is too thick. Use thread within the specied value.

– 67 –

3-B) Thread trimmer timing is excessively

retarded.

3-C) Needle thread tension is too high. Decrease the tension of the thread tension No. 1.

3-D) Tension of the bobbin thread is too high. Adjust the tension of bobbin thread.

3-E) Knife pressure of the counter knife is too

high.

3-F) Initial position of the moving knife is ex-

cessively advanced.

3-G) Thread is not cut sharply. Refer to causes “Thread cannot be trimmed” and

3-4) Needle thread is not caught. 4-A) Stitch skipping at the last stitch. Refer to “2.-(6) Needle-to-hook timing”.

4-B) Check the thread trimmer cam timing. Refer to “2.-(17)-6) Thread trimmer cam timing”.

4-C) Top end of the moving knife is broken or

has burrs.

3-5) Bobbin thread is not caught. 5-A) Stroke of the moving knife is small. Refer to “2.-(17)-3) Vertical position of the moving

5-B) Check the routing of bobbin thread. Correctly thread bobbin thread.

5-C) Top end of the moving knife has broken

or been scratched.

Refer to “2.-(17)-6) Thread trimmer cam timing”.

Refer to “2.-(17)-4) Adjusting the knife pressure”.

Refer to “2.-(17)-6) Thread trimmer cam timing”.

“Thread remains uncut after trimming”.

Replace the moving knife with a new one.

knife”.

Replace the moving knife with a new one.

To the next page

5-D) Check the height of moving knife. Adjust the height of moving knife.

5-E) Thread trimming is performed at the po-

sition where there is no sewing product.

Perform thread trimming while pulling sewing product in the feed direction.

WARNING :

海外講習会用121122LU-2810(-7)EM

Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.

Trouble Cause Checking Corrective measures

From the previous page

– 68 –

3-6) Both needle and bobbin thread cannot

be trimmed.

6-A) The blades of moving knife and counter

knife have been improperly adjusted.

6-B) Counter knife pressure is excessively

low.

6-C) Moving knife fails to work. Refer to “2.-(17)-5) Position of the thread trimmer

6-D) Presser foot drops from cloth at the time

of thread trimming.

Refer to “2.-(17)-4) Adjusting the knife pressure”.

cam”, and “2.-(17)-6) Thread trimmer cam timing”.

Replace the thread trimmer solenoid with a new one.

Perform thread trimming on cloth.

10. Drawing of table

海外講習会用121122LU-2810(-7)EM

(1) For without thread trimming

Z-Z

T-T

4 × ø3.4 on the bottom surface, depth 20 (Drill a hole at the time of set-up.)

Installing position of drawer stopper (on the bottom surface)

ø16 depth 25

ø17 drilled hole

3 × ø13 drilled hole

2 × ø3.5 depth 10

8 × ø2.7 on the bottom surface, depth 6 (Drill a hole at the time of set-up.)

– 69 –

X-X

W-W (3 locations)

Y-Y (2 locations)V-V (2 locations)U-U (2 locations)

Part No. : 40112290

(2) For SC-922

海外講習会用121122LU-2810(-7)EM

Z-Z

T-T

4 × ø3.4 on the bottom surface, depth 20 (Drill a hole at the time of set-up.)

Installing position of drawer stopper (on the bottom surface)

ø16 depth 25

ø17 drilled hole

3 × ø13 drilled hole

2 × ø3.5 depth 10

8 × ø2.7 on the bottom surface, depth 6 (Drill a hole at the time of set-up.)

ø10 drilled hole

ø20 drilled hole

X-X

W-W (3 locations)

Y-Y (2 locations)V-V (2 locations)U-U (2 locations)

Part No. : 40123233

– 70 –

海外講習会用121122LU-2810(-7)EM

SEWING MACHINERY BUSINESS UNIT

海外講習会用121122LU-2810(-7)EM

2-11-1, TSURUMAKI, TAMA-SHI, TOKYO, 206-8551, JAPAN PHONE : (81)42-357-2371 FAX : (81)42-357-2380 http://www.juki.com

ISO 14001

This manual uses environment-friendly soyink.

CM001

An environmental management system to promote and conduct the following:

(1) Eco−friendly development of products and technologies

(2) Green procurement and green purchasing

(3) Energy conservation (reduction in carbon−dioxide emissions)

(4) Resource saving (reduction of papers purchased, etc.) (5) Reduction and recycling of waste in the activities of research, development, design, sales, distribution, and maintenance services of industrial sewing machines and industrial robots, etc., including sales and maintenance services of data entry systems.

JSAE389

HEAD OFFICE

089

Please do not hesitate to contact our distributors or agents in your area for further information when necessary.

* The description covered in this engineer's manual is subject to change for improvement of the

commodity without notice.

12 · 11 Printed in Japan (E)

JUKI LU-2810 Series, LU-2810-7 Series, LU-2810S-7, LU-2810A-7, LU-2810S Engineer's Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

2. Standard adjustment

(1) Needle entry position (Standard gauge type)

(2) Needle entry position (Europe gauge type)

(3) Height of the feed dog

(4) Height of the hook

(5) Adjusting the inner hook guide

1) Clearance of inner hook guide

2) Inner hook guide timing

(6) Needle-to-hook timing

1) Height of the needle bar

2) Needle-to-blade point of hook timing

3) Adjusting the hook needle guard

(7) Lift of the presser foot

1) Hand lifter

2) Knee lifter (Without thread trimmer only)

3) Automatic presser foot lifter (Machine with thread trimmer only)

(8) Feed momentum

1) Alternate momentum

(9) Needle sway (Adjusting the bottom feed amount)

(10) Feed cam timing

1) Horizontal feed cam timing

2) Vertical feed cam timing

3) Top feed cam timing

(11) Stitch length of forward/reverse feed

(12) Position of the reverse feed control lever

(13) Safety clutch

(14) Balancer

(15) Reverse feed cylinder

(16) Lubrication

(17) Thread trimmer device

1) Position of the counter knife and the clamp spring

2) Position of the counter knife base

3) Vertical position of the moving knife

4) Thread trimmer cam timing

5) Position of the thread trimmer cam

6) Adjusting the knife pressure

(18) Detection switch of the amount of alternate vertical movement

3. Portion to which LOCKTITE is applied

4. Selective parts and consumable parts

5. Applying grease

(1) Applying grease

(2) Greasing points

1) Needle bar rocking base

2) Alternate vertical change base

3) Horizontal feed change base

7. Lubrication route diagram

8. Machine head wiring (for the machine with thread trimmer only)

(1) Connectors coming from machine head (Connect to control box)

(2) Connectors that are connected in the head cover

9. Troubles and corrective measures

(1) With regard to sewing

(2) With regard to thread trimming

10. Drawing of table

(1) For without thread trimming

(2) For SC-922