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JUKI LH-3500A Series Instruction Manual

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LH-3500A Series
INSTRUCTION MANUAL

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Summary of Contents for JUKI LH-3500A Series

  • Page 1 LH-3500A Series INSTRUCTION MANUAL...

  • Page 2: Table Of Contents

    CONTENTS 1. SPECIFICATIONS ......................1 2. NAME OF EACH COMPONENT ..................3 3. INSTALLATION ........................ 4 3-1. Caution at the time of set-up ..........................4 3-2. Installation of the sewing machine ........................5 3-3. Adjusting the height of the knee lifter ......................... 6 3-4.

  • Page 3: Specifications

    3.2 to 31.8 mm Lift of presser foot 13 mm by knee lifter, 7 mm by hand lifter lever Lubrication JUKI NEW DEFRIX OIL No. 1 or JUKI MACHINE OIL #7 Declaration Declaration - Equivalent continuous emission sound - Equivalent continuous emission sound...
  • Page 4 4.8 to 9.5 mm Lift of presser foot 13 mm by knee lifter, 7 mm by hand lifter lever Lubrication JUKI NEW DEFRIX OIL No. 1 or JUKI MACHINE OIL #7 Declaration Declaration - Equivalent continuous emission sound - Equivalent continuous emission sound...

  • Page 5: Name Of Each Component

    2. NAME OF EACH COMPONENT ❹ ❷ ❶ ❾ ❸ ❽ ❼ ❺ ❻ ❶ Separately driven needle changeover lever ❽ Power switch ❾ Reverse feed switch (LH-3568A, 3568A-7, 3588A, 3588A-7) ❷ Thread take-up cover (LH-3528A-7, 3568A-7, 3528A (F type), 3578A- ❸...

  • Page 6: Installation

    3. INSTALLATION 3-1. Caution at the time of set-up (1) Transporting procedure of the sewing machine [LH-3528A, 3568A, 3578A, 3588A] [LH-3528A-7, 3568A-7, 3578A-7, 3588A-7] Hold and transport the sewing machine with two persons as shown in the illustration. When carrying the sewing machine, take extreme care not to hold the thread tension controllers by hand.

  • Page 7: Installation Of The Sewing Machine

    3-2. Installation of the sewing machine (1) Installing the under cover ❹ ❶ 22.5mm 18.5mm ❸ ❸ ❶ ❶ ❷ ❸ 2) Fix two rubber seats ❶ on side A (operator’s 1) The under cover should rest on the four corners side) using nails ❷...

  • Page 8: Adjusting The Height Of The Knee Lifter

    3-3. Adjusting the height of the knee lifter WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❷...

  • Page 9: Preparation Of The Sewing Machine

    4. PREPARATION OF THE SEWING MACHINE 4-1. Method of lubrication For this sewing machine, one of two different lubricating methods can be selected. (1) Method of circulating lubrication (when the oil collected in the under cover is reused) Oil tank Lubrication to hook side Ball float case...

  • Page 10: Lubrication To The Oil Tank

    2,000 sti/min or less. • For the oil for hook lubrication, purchase JUKI NEW DEFRIX OIL No. 1 (Part No. : MD- FRX1600C0) or JUKI MACHINE OIL #7 (Part No. : MML007600CA).

  • Page 11: Draining Of Oil From The Oil Tank

    4-3. Draining of oil from the oil tank WARNING : 1. To prevent accidents caused by abrupt start of the sewing machine, do not connect the power plug until draining of oil has been completed. 2. To prevent the occurrence of an inflammation or rash, immediately wash the related portions if oil adheres to your eyes or other parts of your body.

  • Page 12: Oil In The Feed Box

    To use in safety, replace the oil wick of hook section with a new one approximately once a year with the procedure below. 1) Loosen setscrews ❷ (small hook : 2 places, large hook : 3 places) and remove hook gib ❶ . ❸...

  • Page 13: Applying Grease

    • When grease is applied more than is necessary, there is a fear that grease leaks from the thread take-up lever cover section or the needle bar. So, be careful. • Be sure to use the grease contained in JUKI GREASE A TUBE (Part No. : 40006323) supplied with the machine head as accessories.
  • Page 14 [LH-3568A, 3568A-7, 3588A, 3588A-7] Thread take-up lever (oil wick) Felt Needle bar Square block Needle bar bracket Face plate lubrication felt [Common] Remove the rubber cap, take out the felt in A, pour new grease in the hole, and put the felt to which grease has been soaked after removing old grease adhered to the inside of the hole and the felt.
  • Page 15 (2) Releasing procedure of the grease-up warning for SC-920 When the time of grease-up has ❺ ❻ come, screen display of LED ❺ on the left-hand figure becomes "E220". After performing grease-up, release the warning following the procedure below. ❷ ❸...

  • Page 16: Setting Up The Sc-920

    5) When setting No. ❻ is adjusted ❺ ❻ to "118", the current set value is displayed on LED ❺ . Then Press ❹ (switch ❸ ) to switch change to "1". 6) When the change has been com- ❷ or pleted, press switch ❶...
  • Page 17 2) Fix rubber cushion ❻ on control-box mounting plate ❸ with nut ❹ and spring washer ❼ . Three sets of ❷ ❷ are required. ❻ ❸ ❼ ❹ 3) Fix control-box mounting plates ❷ assembled ❶ in step 2) on the table with decoration bolts ❶ , washers ❽...
  • Page 18 (3) Setting procedure of the machine head For the operation panel other than CP-18, refer to the Instruction Manual for the operation panel to be used for the setting procedure of the machine head. 1) Call function setting No. 95 referring ❺...
  • Page 19 (4) Adjusting the machine head (LH-3528A-7, 3568A-7, 3578A-7 and 3588A-7) When the slip between the white marker dot on the handwheel and the concave of the cover is excessive after thread trimming, adjust the angle of the machine head by the operation below. 1) Simultaneously pressing ❺...

  • Page 20: Installing The Belt Cover (For Lh-3528A, 3568A, 3578A And 3588A)

    4-8. Installing the belt cover (For LH-3528A, 3568A, 3578A and 3588A) WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. LH-3528A, 3568A LH-3578A, 3588A ❶...

  • Page 21: How To Take Out The Bobbin Case

    4-10. How to take out the bobbin case WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. 1) Lift latch ❶...

  • Page 22: Threading The Machine Head

    4-12. Threading the machine head [S type and G type] LH-3528A, 3528A-7, 3568A and 3568A-7 WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Fig.
  • Page 23 [G type] LH-3578A, 3578A-7, 3588A and 3588A-7 WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Fig.
  • Page 24 [A type and F type] WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Fig.

  • Page 25: Thread Tension

    4-13. Thread tension WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. [S type and G type] ❷...

  • Page 26: Winding The Bobbin Thread

    4-14. Winding the bobbin thread 1) Insert the bobbin deep into the bobbin winder spindle ❶ until it will go no further. 2) Pass the bobbin thread pulled out from the spool ❸ rested on the right side of the thread stand follow- ing the order as shown in the figure on the left.

  • Page 27: Thread Take-Up Spring

    4-15. Thread take-up spring WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. [S type and G type] (1) When you want to change the stroke of the thread take-up spring ❼...
  • Page 28 [A type and F type] (1) When you want to change the stroke of the thread take-up spring ❼ ❹ ❺ ❾ ❶ ❷ To turn ❽ ❸ ❻ 1) Stroke of thread take-up spring ❶ on the right is adjustable by moving thread tension No. 2 asm. ❸ to the left or right after loosening thread tension No.

  • Page 29: Adjusting The Stitch Length

    4-16. Adjusting the stitch length Turn stitch dial ❶ counterclockwise (clockwise) to set the value on the dial corresponding to a desired stitch length to the marker dot ❸ engraved on the ❸ machine arm. When it is hard to turn stitch dial ❶ , turn it while ❶...
  • Page 30 [LH-3568A, 3568A-7, 3588A and 3588A-7] • Adjust the needle and the hook as follows. ❹ [Adjusting procedure for DPx5(134) ❷ needle] 1) Set the stitch dial at 2.5 for the S type or ❸ 3 for the G type. 2) Turn the handwheel to align the blade point of hook with the center of needle when the needle bar goes up by 2.2 mm from the lowest position (lower engraved...

  • Page 31: Pedal Pressure And Pedal Stroke

    4-18. Pedal pressure and pedal stroke WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. (1) Adjusting the pressure required to Upper depress the front part of the pedal...

  • Page 32: Operation Of The Sewing Machine

    5. OPERATION OF THE SEWING MACHINE 5-1. Pedal Operation [The pedal is operated in the following four steps: ] 1) The machine runs at low sewing speed when you lightly depress the front part of the pedal. B 2) The machine runs at high sewing speed when you further depress the front part of the pedal.

  • Page 33: Adjusting The Pressure Of The Presser Foot

    5-3. Adjusting the pressure of the presser foot Loosen nut ❷ by turning counterclockwise, and turn presser spring regulator ❶ to adjust the pressure. Decrease Increase Turn the regulator clockwise to increase the pres- sure and turn it counterclockwise to decrease the pressure.

  • Page 34: Thread Tension Release Changeover When Using The Knee Lifter

    5-5. Thread tension release changeover when using the knee lifter For the LH-3568A, 3568A-7, 3588A and 3588A- 7, the thread tension release of the thread tension controller has been factory-interlocked with the knee lifter or AK device at the time of delivery. ❶...

  • Page 35: Maintenance

    6. MAINTENANCE 6-1. Procedure of changing over between bottom feed and needle feed and the adjustment (for LH-3528A only) WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. (1) Changing procedure to bottom feed and the adjustment ❶...
  • Page 36 (2) Changing procedure to needle feed and the adjustment The procedure is the reverse of "(1) Changing procedure to bottom feed and the adjustment". Loosen hinge screw ❶ , move needle bar rocking rod ❷ from needle rocking rod fixing base ❸ to needle bar rocking rod arm ❹...

  • Page 37: Changing The Feed Timing

    6-2. Changing the feed timing The feed timing has been factory-adjusted as illus- trated in the sketch on the left. The following describes how to change the feed tim- ing to produce better-tensed seams from the state given in the sketch on the right. 1) Turning pulley ❶...

  • Page 38: Adjusting The Thread Trimming Cam

    6-3. Adjusting the thread trimming cam (1) Position of the thread trimming cam and ❶ ❼ ❷ the thread trimming timing 1) Align engraved marker dot ❶ on the arm with engraved marker dot ❷ (red) on the handwheel. 2) When thread trimmer driving arm stopper ❸ comes in contact with knife driving arm ❹...

  • Page 39: Adjusting The Hook Needle Guard

    6-4. Adjusting the hook needle guard WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. (Bend inward.) (Bend outward.) ❶...

  • Page 40: Adjusting The Height And The Inclination Of The Feed Dog

    6-6. Adjusting the height and the inclination of the feed dog WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. (1) Adjusting the height 1) Loosen feed driving link setscrew ❶...

  • Page 41: Replacing The Gauge

    6-7. Replacing the gauge WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. Drive arm pin ❷...

  • Page 42: Adjusting The Position Of The Moving Knife

    6-9. Adjusting the position of the moving knife WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. 1) Loosen clamp screw ❹...

  • Page 43: Adjusting The Counter Knife Position And The Knife Pressure

    6-10. Adjusting the counter knife position and the knife pressure WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. 1) Align counter knife base ❶...

  • Page 44: Position Of The Wiper

    6-11. Position of the wiper WARNING : To protect against possible personal injury due to abrupt start of the machine, be sure to start the following work after turning the power off and ascertaining that the motor is at rest. ❷...

  • Page 45: Replacing The Bobbin Thread Slack Preventer Spring (For Lh-3568A, 3568A-7, 3588A And 3588A-7)

    6-13. Replacing the bobbin thread slack preventer spring (For LH-3568A, 3568A-7, 3588A and 3588A-7) 1) Loosen screw ❶ and remove bobbin thread slack preventer spring ❷ from the groove on the bobbin case. ❷ 2) Fit bobbin thread slack preventer spring ❷ which replaces the removed spring in the bobbin case through the groove.

  • Page 46: Stitch-To-Angle Table By Gauge (Pitch And Mm Conversion Table)

    7. STITCH-TO-ANGLE TABLE BY GAUGE (PITCH AND mm CONVERSION TABLE) 1/8"(3.17mm) 5/32"(3.96mm) Number of Number of stitches stitches Turning Turning angle angle 3/16"(4.76mm) 7/32"(5.56mm) Number of Number of stitches stitches Turning Turning angle angle 1/4"(6.35mm) 9/32"(7.14mm) Number of Number of stitches stitches Turning...

  • Page 47: Gauge Sets

    8. GAUGE SETS (1) LH-3528A Swivel guide Needle gauze size Presser foot asm. Presser foot asm. Tip-divided Tip-divided Lower feed Code inch P a r t N o . P a r t N o . P a r t N o .
  • Page 48 Needle gauze size Feed dog 1 . 7 1 . 7 1 . 7 1 . 7 1 . 7 1 . 1 5 Code 1 . 2 1 . 9 1 . 7 2 . 2 1 . 4 1 .
  • Page 49 (2) LH-3528A-7 Needle gauze size Throat Plate Needle clamp asm. Feed dog 1 . 7 1 . 7 1 . 7 1 . 7 Code 2 . 2 m m 1 . 7 1 . 9 Wire type Hole type Option Option 2 .
  • Page 50 (3) LH-3568A Sliding plate asm. Sliding plate asm. Needle gauze size Needle clamp asm. (DP5) (Left) (Front) Needle clamp asm. Needle clamp asm. Needle clamp asm. Needle clamp asm. (Left) (Right) (Left) (Right) Code Option Option Option Hole type Hole type inch P a r t N o .
  • Page 51 (4) LH-3568A-7 Swivel guide Needle gauze size Feed dog Presser foot asm. Throat Plate Presser foot asm. Option Option Tip-divided Tip-divided 1 . 7 1 . 7 1 . 7 1 . 7 Code 1 . 9 2 . 2 m m 2 .
  • Page 52 (5) LH-3578A (G type) Needle clamp Presser foot Swivel guide Throat Plate Needle gauze size Feed dog Throat Plate asm. asm. Presser foot asm. (with taping) 1 . 7 Tip-divided 1 . 7 Code 2 . 2 m m 2 . 2 Hole type Option inch...
  • Page 53 (6) LH-3578A-7 (G type) Needle clamp Needle gauze size Throat Plate Feed dog asm. 1 . 7 1 . 7 Code 2 . 2 m m Hole type Option 2 . 4 inch P a r t N o . P a r t N o .
  • Page 54 (7) LH-3588A (G type) Needle gauze size Needle clamp asm. (DP17) Needle clamp asm. (DP5) Needle clamp Needle clamp Needle clamp Needle clamp asm. (Left) asm. (Right) asm. (Left) asm. (Right) Code Option Option Hole type Hole type inch P a r t N o .
  • Page 55 (8) LH-3588A-7 (G type) Swivel guide Needle gauze size Feed dog Throat Plate Presser foot asm. Presser foot asm. Option Tip-divided 1 . 7 1 . 7 Code 2 . 2 m m 2 . 4 inch P a r t N o .

  • Page 56: Troubles And Corrective Measures

    9. TROUBLES AND CORRECTIVE MEASURES TROUBLES CAUSES CORRECTIVE MEASURES ① There is a sharp edge or burr on ◦ Remove sharp edge or burr using a fine Thread breakage (Thread is untwisted the thread path, needle point, hook sandpaper. Polish the surface of the or scraped.) blade point or bobbin case resting bobbin case resting groove on the throat...
  • Page 57 TROUBLES CAUSES CORRECTIVE MEASURES ① Bobbin thread does not pass ◦ Thread the bobbin case correctly. Loose stitch through the forked end of the tension spring on the bobbin case. ② Thread path has rough surface. ◦ Remove rough surface using a fine sandpaper or polish the surface using a buffing wheel.

  • Page 58: Motor Pulley And Belt

    10. MOTOR PULLEY AND BELT ■ Motor pulley and belt for the machine without thread trimmer are as described below. 1) Use a clutch motor with an output 400 W (2P). 2) Use M type V belt. 3) The relation between the motor pulley, belt length and number of revolutions of sewing machine is as shown in the list below.

This manual is also suitable for:

Lh-3528aLh-3528a-7Lh-3568aLh-3568a-7Lh-3578aLh-3578a-7

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