Baby Lock BL9 Service Manual And Parts List
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Baby Lock BL9 Service Manual And Parts List

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SERVICING MANUAL
&
PARTS LIST
(MODEL BL9)
BABYLOCK

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Summary of Contents for Baby Lock BL9

  • Page 1 SERVICING MANUAL & PARTS LIST (MODEL BL9) BABYLOCK...

  • Page 2: Table Of Contents

    CONTENTS TROUBLESHOOTING ....................1–3 SERVICE ACCESS FACE COVER / BELT COVER .................. BASE PLATE ......................FRONT COVER ......................REAR COVER ......................MECHANICAL ADJUSTMENT TOP TENSION ......................BOBBIN TENSION ..................... PRESSER BAR HEIGHT AND ALIGNMENT ............NEEDLE SWING ......................NEEDLE DROP ......................CLEARANCE BETWEEN NEEDLE AND HOOK (ADJUSTMENT METHOD NO.

  • Page 3: Troubleshooting

    MODEL BL9 TROUBLESHOOTING PROBLEM CAUSE REMEDY REFERENCE 1. Skipping 1. Needle is not inserted Insert the needle properly. stitches properly. 2. Needle is bent or worn. Change the needle. 3. Incorrectly threaded Rethread. 4. Needle or thread are Use the recommended sewing inappropriate for fabric being needle and thread.
  • Page 4 MODEL BL9 PROBLEM CAUSE REMEDY REFERENCE 3. Breaking 1. Initial sewing speed is too fast. Start with medium speed. upper thread 2. Thread path is incorrect. Use the proper thread path. 3. Needle is bent or dull. Replace with a new needle.
  • Page 5 MODEL BL9 PROBLEM CAUSE REMEDY REFERENCE 6. Noisy 1. Backlash between shuttle hook See mechanical adjustment P. 14 operation gear and lower shaft gear is “Clearance between needle and too great. hook (NO. 2).” 2. Lower shaft gear is loose.

  • Page 6: Service Access

    MODEL BL9 SERVICE ACCESS FACE COVER Face cover Remove the face cover by removing the setscrew (A). BELT COVER Belt cover ( B) Loosen setscrew (B). Take the belt cover out.

  • Page 7: Base Plate

    MODEL BL9 SERVICE ACCESS BASE PLATE Base plate (To remove) Loosen the setscrews (A). Remove the base plate. (To attach) Mount the base plate by four setscrews.

  • Page 8: Front Cover

    MODEL BL9 SERVICE ACCESS FRONT COVER Front cover (To remove) Remove the face cover, and remove the belt cover (See page 4). Remove dials (A) and ( B). Loosen setscrews (C), (D), (E), (F), and (G) and then, remove the front cover by removing setscrews (H), (I), AND (J).

  • Page 9: Rear Cover

    MODEL BL9 SERVICE ACCESS REAR COVER Rear cover (To remove) Remove the face cover and belt cover (See page 4). NOTE: Pull up the spool pins. Loosen setscrews (A), (B), (C) and (D) (2 pcs.), and then, remove the rear cover by removing setscrews (E), (F), (G) and (H).

  • Page 10: Mechanical Adjustment

    MODEL BL9 MECHANICAL ADJUSTMENT TOP TENSION To check: The standard upper thread tension should be 65–95 g when pulling the thread (cotton thread #50) in the direction of (B) with setting the tension dial at “3.” (make sure the foot should be lowered.)

  • Page 11: Bobbin Tension

    MODEL BL9 MECHANICAL ADJUSTMENT BOBBIN TENSION To check: Set the bobbin in the bobbin case and pass the thread (cotton #50) through the tension spring. The bobbin thread tension should be 45–55g when pulling the thread in the direction of (B).

  • Page 12: Presser Bar Height And Alignment

    MODEL BL9 MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT AND ALIGNMENT To check: Raise the presser foot lever (A). The distance between the presser foot (D) and the needle plate (E) should be 6.0 mm (0.24"). Adjustment procedure: Remove the face cover (See page 4).

  • Page 13: Needle Swing

    MODEL BL9 MECHANICAL ADJUSTMENT NEEDLE SWING To check: Adjust the needle swing according to the following procedure, If the needle bar starts moving sideways while the needle is in the fabric at sewing the zigzag pattern (with maximum zigzag width).

  • Page 14: Needle Drop

    MODEL BL9 MECHANICAL ADJUSTMENT NEEDLE DROP To check: When the needle swings in maximum zigzag width, the distance between both ends of the needle hole on the needle plate and the needle drop positions should be equal. If not, adjust as follows: Adjustment procedure: Remove the face cover (See page 4).

  • Page 15: Clearance Between Needle And Hook (Adjustment Method No. 1)

    MODEL BL9 MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND HOOK (ADJUSTMENT METHOD NO. 1) To check: The clearance between the needle and shuttle race should be –0.05 to +0.10 mm. If not, adjust as follows: Adjustment procedure: Remove the face cover (See page 4).

  • Page 16: Clearance Between Needle And Hook (Adjustment Method No.2)

    MODEL BL9 MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND HOOK (ADJUSTMENT METHOD NO.2) To check: Use this adjustment method NO. 2 when method NO.1 cannot be used. The clearance between the needle and shuttle race should be –0.05 to +0.10 mm.

  • Page 17: Feed Dog Height

    MODEL BL9 MECHANICAL ADJUSTMENT FEED DOG HEIGHT To check: Lower the presser foot. Turn the handwheel toward you until the needle bar comes to the feed dog above the needle plate should be 0.75–0.90 mm. If it is not in the range, adjust as follows.

  • Page 18: Needle Bar Height

    MODEL BL9 MECHANICAL ADJUSTMENT NEEDLE BAR HEIGHT To check: When the tip of shuttle hook meets the left side of the needle in ascending travel of the needle from its left and lowest position, The distance between the top of the needle eye and the tip of the shuttle hook should be in the range of 2.9-3.5 mm.

  • Page 19: Needle Timing To Shuttle

    MODEL BL9 MECHANICAL ADJUSTMENT NEEDLE TIMING TO SHUTTLE To check: The height of the needle point from its lowest point of travel should be in the range of 1.45- 1.95 mm when the tip of the shuttle hook just meets the left side of the needle at the left needle position.

  • Page 20: Buttonhole Feed Balance

    MODEL BL9 MECHANICAL ADJUSTMENT BUTTONHOLE FEED BALANCE To check: When sewing buttonhole, the stitches on each side of buttonhole should be the same stitch density. The range of 9-12 stitches in the right side row "backward feeding" against 10 stitches in the left side row "forward feeding"...

  • Page 21: Feed Balance On Stretch Stitch

    MODEL BL9 MECHANICAL ADJUSTMENT FEED BALANCE ON STRETCH STITCH To check: If the stretch stitch patterns are distorted with setting the stitch length dial at " S.S. ". (In case of being a difference between forward feeding and backward feeding during stretch...

  • Page 22: Bartack Feed Of Buttonhole

    MODEL BL9 MECHANICAL ADJUSTMENT BARTACK FEED OF BUTTONHOLE To check: If the material is feed forward or backward when sewing bartack on buttonhole, make an adjustment as follows: Adjustment procedure: Set the pattern selector dial at " ", and the stitch length dial at "4".

  • Page 23: Disengagement Of Cam Follower

    MODEL BL9 MECHANICAL ADJUSTMENT DISENGAGEMENT OF CAM FOLLOWER To check: Too narrow clearance between the cam follower and the top convex of zigzag cam may often cause difficulty in turning of the pattern selector dial, this can also cause unintended patterns to become selected or make zigzag stitch in straight stitch setting.

  • Page 24: Motor Belt Tension

    MODEL BL9 MECHANICAL ADJUSTMENT MOTOR BELT TENSION To check: 1.Too tight or too loose motor belt tension may create belt noise and also too tight motor belt tension can cause the machine to run slow and will overload the motor.

  • Page 25: Wiring

    MODEL BL9 WIRING From motor From lamp socket...

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