JUKI HZL-25Z Service Manual
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JUKI HZL-25Z Service Manual

JUKI HZL-25Z Service Manual

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SEWING MACHINE
HZL-25Z
SERVICE MANUAL

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Summary of Contents for JUKI HZL-25Z

  • Page 1 ® SEWING MACHINE HZL-25Z SERVICE MANUAL...

  • Page 2: Base Cover

    SECTION PAGE [ 1 ] DISASSEMBLING OF OUTER PARTS 1. Base cover 1. Lower presser foot and lay machine. 2. Remove 3 screws (1) and take out base cover (2). * Re-assembling should be done in the reverse way. 2. Gear cover 1.

  • Page 3: Face Cover

    SECTION PAGE 3. Face cover Disassembling 1. Raise presser foot lifter (1). 2. Remove screw (2) and take out face cover (3). Re-assembling 1. Raise presser foot lifter (1). 2. Insert presser foot lifter (1) into small window (4) of face cover (3). 3.

  • Page 4: Side Cover

    SECTION PAGE 4. SIDE COVER Disassembling 1. Remove screw (1), (9). 2. Push cover (2) as indicated by arrow inserting your finger into the bobbin winder hole (3) and take out cover (2). 〔Cover (2) has fitting hook (4).〕 3. When it cannot be removed by the above way, take out base cover (5) and remove cover (2) from lower part.
  • Page 5 SECTION PAGE 5. FRONT COVER Disassembling 1. Remove side cover and face cover. 〔See page 2 and 3. 〕 2. Remove screws (1), (2), (3) and then securing plate (4). 3. Take out face cover (8) removing hook (7) from small window (6) of base cover (5).
  • Page 6 SECTION PAGE 6. SHUTTLE COVER Disassembling 1. Remove screw (1) and take out securing plate (2). 2. Remove shuttle cover (3) extracting as indicated by arrow. * Re-assembling should be done in the reverse way.
  • Page 7 SECTION PAGE 7. Hand wheel Re-assembling 1. Set washer (a) and washer (b) in position as illustrated and fix them by tightening stud screw (c) by hand. 2. Set clutch wheel (d) in position so that its projected portion may be posi- tioned as illustrated.

  • Page 8: Table Of Contents

    SECTION 2 - 0 PAGE [ 2 ] ADJUSTMENTS * Adjustment can be made with or without removal of outer parts. Without Removing outer parts removing Adjustment outer Front Face Side Gear Base parts cover cover cover cover cover 2 - 1 L-R positioner ○...
  • Page 9 SECTION 2 - 1 PAGE 2 - 1 L - R positioner Checking: 1. Move the needle to the left end by hand. 2. Check if the needle touches the left end of needle hole of needle plate. NOTE: * Needle will be broken if needle is outside of left end of needle hole. * Selector dial can not be turned smoothly if there is clearance of more than 0.3 mm between left end of needle hole and needle.
  • Page 10 SECTION 2 - 2 PAGE 2 - 2 Needle position - Straight stitching and Zigzag stitching, maximum width Checking: 1. Remove presser foot. 2. Set machine at "straight stitching A" by turning selector dial. 3. Turning hand wheel by hand, lower the needle and check if needle point comes to the center of needle plate hole.
  • Page 11 SECTION 2 - 3 PAGE 2 - 3 Needle Position at Zigzag Stitching Checking: 1. Set machine at "zigzag stitching C, (maximum width)" by turning selector dial. 2. Bring needle to right hand lowest position. Slowly lift up needle and ob- serve its leftward movement when leaving upper surface of needle plate.
  • Page 12 SECTION 2 - 4 PAGE 2 - 4 Clearance between zigzag cam and cam follower Checking: 1. Remove presser foot. 2. Set machine at "zigzag stitching C, (maximum width)" by turning selector dial. 3. Lower needle to left side and its lowest position. 4.

  • Page 13: Feed Dog Height

    SECTION 2 - 5 PAGE 2 - 5 Feed Dog Height Checking: 1. Set stitch length control at "Maximum", and selector dial at "Straight Stitching A". 2. Remove needle and presser foot. 3. Set feed dog at highest position by turning hand wheel by hand. 4.

  • Page 14: Feed Dog Longitudinal Positioning

    SECTION 2 - 6 PAGE 2 - 6 Feed dog Longitudinal positioning Checking: 1. Set stitch length at maximum, and selector dial at "Straight Stitching A". 2. Turning hand wheel, move feed dog to the rear end position, and see if rear edge of center front dog keeps clearance (A) to the needle plate hole.

  • Page 15: Feed Dog Lateral Positioning

    SECTION 2 - 7 PAGE 2 - 7 Feed Dog Lateral positioning Checking: 1. Set machine for "maximum stitch length". 2. Check if the groove of needle plate touches left end of feed dog. 3. Check if noise is not made. 4.

  • Page 16: Feed Dog Timing

    SECTION 2 - 8 PAGE 2 - 8 Feed Dog Timing Vertical Movement * * Before checking, follow Section 2 - 5 Feed Dog Height. Checking: 1. Set machine for maximum stitch length. 2. Turning hand wheel, move down feed dog. 3.

  • Page 17: Lateral Movement

    SECTION 2 -8 PAGE Lateral Movement Checking: 1. Set machine for maximum stitch length. 2. Set feed dog at the start of its movement (when cam (1) starts to activate forked connection). 3. Turning hand wheel, bring up needle bar to its highest dead point (A). 4.
  • Page 18 SECTION 2 - 9 PAGE 2 - 9 "0" - Feeding Needle Positioning Checking: 1 Set stitch length control at "0", and selector dial at "Straight Stitching A". 2. Place paper under presser foot and take 11 stitches without thread. 3.
  • Page 19 SECTION 2 - 10 PAGE 2 - 10 Buttonhole sewing - "0" feeding Checking: 1. Set stitch length control "4". 2. Set machine at "BH No.1, 3" by turning selector dial. (Use buttonhole guide.) 3. Place the paper under buttonhole guide and take 11 zigzag stitches without thread.

  • Page 20: Balance Of Reverse Stitch Length

    SECTION 2 - 11 PAGE 2 - 11 Balance of reverse stitch length Checking: Reverse stitch length is within the range of 3.0 - 3.7 mm. Adjustment: 1. Remove side cover. 2. Loosen screw (3). 3. Holding reverse lever (1), adjust the reverse lever arm (2) upward or downward and tighten screw (3).
  • Page 21 SECTION 2 - 12 PAGE 2 - 12 Balance of stitch length - Stretch stitching NOTE: Before checking, follow Section 2 - 9 "0" - feeding needle position. Checking: 1. Set machine for "zigzag stitching C". 2. Set for "stretch stitching ( )"...

  • Page 22: Presser Foot Height

    SECTION 2 - 13 PAGE 2 - 13 Presser Foot Height Checking: 1. Lower feed dog below the needle plate. 2. Lift up presser foot lever. 3. Check and see if clearance (A) between needle plate and presser foot is about 5.5 mm.

  • Page 23: Needle Height

    SECTION 2 - 14 PAGE 2 - 14 Needle Height Checking: 1. Remove presser foot. 2. Set selector dial at "Straight Stitch A". 3. Turning hand wheel, bring the needle bar to its highest position. 4. Check and see if the distance between needle point and needle plate sur- face is about 14.6 mm.

  • Page 24: Needle Clearance To Shuttle

    SECTION 2 - 15 PAGE 2 - 15 Needle Clearance to Shuttle Checking: 1. Remove bobbin case and shuttle race cover. 2. Set #14 needle. 3. Set machine at "Straight Stitch A" by turning selector dial. 4. Turning hand wheel, bring the shuttle point to the center line of needle. 5.
  • Page 25 SECTION 2 - 15 PAGE Adjustment if needle touches needle hole: 1. Bring needle at center of needle hole following the method of "2 - 15 Needle Clearance to Shuttle (Adjustment)". 2. Remove gear cover. 3. Following adjustment is to be made depending on situation. A - Needle touches front of needle hole (Fig.
  • Page 26 SECTION 2 - 15 PAGE B - Needle touches back of needle hole (Fig. b - PAGE 2). 1 Loosen screws (11), (12) of setting plate (10) for lower shaft bush. However, lower shaft bush (13) must not float. (Big clearance should not be made between setting plate and bush.) 2 Moving lower shaft gear assy (14) to left (C).
  • Page 27 SECTION 2 - 15 PAGE Checking rotating direction of shuttle race assy: Align needle with the right edge (B) of cut portion (A). Checking backlash of shuttle shaft gear and lower shaft gear: 1. Remove bobbin case, shuttle cover, and shuttle hook. 2.
  • Page 28 SECTION 2 - 16 PAGE 2 - 16 Needle Clearance to Shuttle * * Before checking, follow Section 2 - 2 Needle Position at Straight and Maximum Zigzag Width and 2 - 14 Needle Height. Checking: 1. Remove bobbin case and shuttle race cover. 2.

  • Page 29: Control Panel Pointer Positioning

    SECTION 2 - 17 PAGE 2 - 17 Control panel pointer positioning Checking: 1. Set machine for "BH left 2" (pointer at highest position). 2. Check if pointer is set in correct position of window of control panel. Adjustment: 1. Remove side cover. 2.

  • Page 30: Belt Tension

    SECTION 2 - 18 PAGE 2 - 18 Belt tension * Belt tension should be adjusted in case of belt jumping on heavy material sewing or slow rotation. Reference: Belt is bent about 7 mm when pushing middle portion of belt between upper shaft and motor with pressure of 200 g.
  • Page 31 SECTION 2 - 19 PAGE 2 - 19 Hooking Fork Position of Needle Threader Checking: ( 3 ) 1. Check and see if #14 needle is used and it is not bent. 2. Set machine for Straight Stitch at center needle position.
  • Page 32 SECTION 2 - 19 PAGE Exchange of needle hole threader lever: 1. Remove presser foot. 2. Raise needle to its highest position. 3. Push needle hole threader lever down by pliers or forked driver as illustrated. 4. Remove needle hole threader lever (3). Knock pin ( 3 )

  • Page 33: Bobbin Winder

    SECTION 2 - 20 PAGE 2 - 20 Bobbin Winder A. Winding balance Checking: 1. Wind thread on the bobbin. 2. Check if the thread is wound evenly. Adjustment: 1. Insert box driver (hexagonal box driver, etc.) into the bobbin winder shaft and bent it.

  • Page 34: Rubber Foot Height

    SECTION 2 - 21 PAGE 2 - 21 Rubber foot height Checking: 1. Put the machine on the flat table. 2. Check the balance of the machine. Adjustment: 1. Loosen nut (1). 2. Insert the driver into the hole (2) and adjust by turning it. 3. Tighten nut (1) securely after adjustment. * Use screw driver P#.74793 included in the accessories.
  • Page 35 ® 8-2-1, KOKURYO-CHO, CHOFU-SHI, TOKYO 182-8655, JAPAN PHONE: 03(3480)5034 FAX: 03(3480)5037 © http: //www.juki.co.jp Copyright 2007 JUKI CORPORATlON All right reserved throughout the world. E-mail: hsm@juki.co.jp 40058010 2007/01...

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