baby lock BL15B Zest Sewing Machine User Manual

baby lock BL15B Zest Sewing Machine

Product Information

• Model: BL15B
• First Edition: 6
• September 2018
• Service Manual & Parts List

Product Usage Instructions

What to do when:

1. Skipping Stitches:
   • Condition: Needle is not inserted properly.
   • Cause: Insert the needle properly.
   • Reference: Page 15
   • Condition: Needle is bent or worn.
   • Cause: Change the needle.
   • Condition: Incorrectly threaded.
   • Cause: Rethread.
   • Condition: Needle or thread are inappropriate for fabric being sewn.
   • Cause: Use the recommended sewing needle and thread.
   • Condition: Sewing on stretch fabric.
   • Cause: Use a #11 blue tip needle.
   • Condition: Inappropriate needle bar height.
   • Cause: See mechanical adjustment needle bar height.
   • Condition: Inappropriate needle to hook timing.
   • Cause: See mechanical adjustment needle timing to shuttle.
   • Condition: Inappropriate needle to hook clearance.
   • Cause: See mechanical adjustment clearance between needle and hook.
   • Reference: Pages 16, 12, 13
2. Fabric not moving:
   • Condition: Incorrect feed dog height.
   • Cause: See mechanical adjustment feed dog height.
   • Reference: Page 14
   • Condition: Thread on bottom side of fabric is jammed up.
   • Cause: Make sure to bring both needle and bobbin thread under the foot when starting sewing.
   • Condition: Feed dog teeth are worn.
   • Cause: Change the feed dog.
3. Breaking upper thread:
   • Condition: Initial sewing speed is too fast.
   • Cause: Start with medium speed.
   • Condition: Thread path is incorrect.
   • Cause: Use the proper thread path.
   • Condition: Needle is bent or dull.
   • Cause: Replace with a new needle.
   • Condition: Upper thread tension is too strong.
   • Cause: Adjust upper thread tension correctly.
   • Reference: Page 7
   • Condition: Needle size is inappropriate for fabric.
   • Cause: Use appropriate needle and thread for fabric in use.
   • Condition: Needle eye is worn.
   • Cause: Change the needle.
   • Condition: Needle hole in needle plate is worn or burred.
   • Cause: Replace the needle plate.
4. Breaking bobbin thread:
   • Condition: Incorrectly threaded bobbin case.
   • Cause: Thread bobbin case correctly.
   • Condition: Too much thread is around on the bobbin.
   • Cause: Adjust the position of stopper.
   • Condition: Lint is stuck inside the bobbin holder.
   • Cause: Clean the hook race.
   • Condition: Thread quality is too low.
   • Cause: Change to a high-quality sewing thread.
   • Condition: Thread is jamming around the bobbin.
   • Cause: Clear out the jamming thread.
   • Condition: Bobbin thread tension is too strong.
   • Cause: Adjust bobbin thread tension correctly.
   • Reference: Page 8
5. Needle breaks:
   • Condition: Needle is hitting the needle plate.
   • Cause: See mechanical adjustment needle drop.
   • Reference: Page 11
   • Condition: Needle is bent or worn.
   • Cause: Change the needle.
   • Condition: Needle is hitting the hook race.
   • Cause: See mechanical adjustment clearance between needle and hook.
   • Reference: Pages 12, 13
   • Condition: The fabric moves while the needle is piercing it, or the needle zigzags while in fabric.
   • Cause: See mechanical adjustment needle swing.
   • Reference: Page 10
   • Condition: Fabric is being pulled too strongly while sewing.
   • Cause: Guide the fabric gently while sewing.
   • Reference: Page 10
6. Noisy Operation:
   Cause: Backlash between shuttle hook gear and lower shaft gear is too great.

WHAT TO DO WHEN

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|
| INAPPROPRIATE FOR| SEWING NEEDLE AND THREAD.|
| FABRIC BEING SEWN.| |
| 5. SEWING ON STRETCH| USE A #11 BLUE TIP NEEDLE.|
| FABRIC| |
| 6. INAPPROPRIATE NEEDLE| SEE MECHANICAL| P.15
| BAR HEIGHT| ADJUSTMENT|
| | “NEEDLE BAR HEIGHT”.|
| 7. INAPPROPRIATE NEEDLE| SEE MECHANICAL| P.16
| TO HOOK TIMING| ADJUSTMENT “NEEDLE|
| | TIMING TO SHUTTLE”.|
| 8. INAPPROPRIATE NEEDLE| SEE MECHANICAL| P.12,13
| TO HOOK CLEARANCE| ADJUSTMENT “CLEARANCE|
| | BETWEEN NEEDLE AND|
| | HOOK”.|

2. FABRIC NOT MOVING

| ****

1. INCORRECT F.D. HEIGHT

| ****

SEE MECHANICAL ADJUSTMENT “FEED DOG HEIGHT”.

| ****

P.14

| 2. THREAD ON BOTTOM SIDE OF FABRIC IS JAMMED UP.| MAKE SURE TO BRING BOTH NEEDLE AND BOBBIN THREAD UNDER THE FOOT WHEN STARTING SEWING.|
| 3. FEED DOG TEETH ARE WORN.| CHANGE THE FEED DOG.|

3. BREAKING

| ****

1. INITIAL SEWING SPEED IS

| ****

START WITH MEDIUM SPEED.

|
---|---|---|---
UPPER| TOO FAST.| |
THREAD| 2. THREAD PATH IS| USE THE PROPER THREAD|
| INCORRECT.| PATH.|
| 3. NEEDLE IS BENT OR DULL.| REPLACE WITH A NEW NEEDLE.|
| 4. UPPER THREAD TENSION IS TOO STRONG.| ADJUST UPPER THREAD TENSION CORRECTLY.| P.7
| 5. NEEDLE SIZE IS INAPPROPRIATE FOR FABRIC.| USE APPROPRIATE NEEDLE AND THREAD FOR FABRIC IN USE.|
| 6. NEEDLE EYE IS WORN.| CHANGE THE NEEDLE.|
| 7. NEEDLE HOLE IN NEEDLE PLATE IS WORN OR BURRED.| REPAIR THE HOLE OR REPLACE THE NEEDLE PLATE.|

4. BREAKING BOBBIN

| ****

1. INCORRECTLY THREADED BOBBIN CASE.

| ****

THREAD BOBBIN CASE CORRECTLY.

|
THREAD| 2. TOO MUCH THREAD IS| ADJUST THE POSITION OF|
| AROUND ON THE BOBBIN.| STOPPER.|
| 3. LINT IS STUCK INSIDE THE BOBBIN HOLDER.| CLEAN THE HOOK RACE.|
| 4. THREAD QUALITY IS TOO LOW.| CHANGE TO A HIGH QUALITY SEWING THREAD.|
| 5. THREAD IS JAMMING AROUND THE BOBBIN.| CLEAR OUT THE JAMMING THREAD.|
| 6. BOBBIN THREAD TENSION IS TOO STRONG.| ADJUST BOBBIN THREAD TENSION CORRECTLY.| P.8

5. NEEDLE

| ****

1. NEEDLE IS HITTING THE

| ****

SEE MECHANICAL

| ****

P.11

BREAKS| NEEDLE PLATE.| ADJUSTMENT “NEEDLE DROP.”|
| 2. NEEDLE IS BENT OR WORN.| CHANGE THE NEEDLE.|
| 3. NEEDLE IS HITTING THE| SEE MECHANICAL| P.12,13
| HOOK RACE.| ADJUSTMENT “CLEARANCE|
| | BETWEEN NEEDLE AND HOOK”.|
| 4. THE FABRIC MOVES WHILE| SEE MECHANICAL| P.10
| THE NEEDLE IS PIERCING| ADJUSTMENT “NEEDLE SWING”.|
| IT, OR THE NEEDLE ZIGZAGS| |
| WHILE IN FABRIC.| |
| 5. FABRIC IS BEING PULLED TOO| GUIDE THE FABRIC GENTLY|
| STRONGLY WHILE SEWING.| WHILE SEWING.|
6. NOISY OPERATION| 1. BACKLASH BETWEEN SHUTTLE HOOK GEAR AND LOWER SHAFT GEAR IS TOO GREAT.| SEE MECHANICAL ADJUSTMENT “CLEARANCE BETWEEN NEEDLE AND HOOK (NO.2)”.| P.13
---|---|---|---
| 2. LOWER SHAFT GEAR IS LOOSE.| ELIMINATE THE LOOSENESS.|
| 3. INAPPROPRIATE BELT TENSION.

4.  UPPER SHAFT GEAR IS LOOSE.

| SEE MECHANICAL ADJUSTMENT “MOTOR BELT TENSION”.

ELIMINATE THE LOOSENESS.

| P.21
| 5. NOT ENOUGH OIL.| OIL ALL MOVING PARTS.|
7. DEFORMATION| 1. INAPPROPRIATE ZIGZAG| SEE MECHANICAL| P.10
PATTERN| SYNCHRONIZATION.| ADJUSTMENT “NEEDLE|
| | SWING”.|
| 2. INAPPROPRIATE| SEE MECHANICAL| P.20
| DISENGAGEMENT OF CAM| ADJUSTMENT|
| FOLLOWER.| “DISENGAGEMENT OF CAM|
| | FOLLOWER”.|
| 3. UPPER THREAD TENSION| ADJUST UPPER THREAD| P.7
| IS TOO STRONG.| TENSION CORRECTLY.|

SERVICE ACCESS

FACE COVER

1. . REMOVE THE FACE COVER BY REMOVING THE SETSCREW (A).

FRONT COVER

TO REMOVE:

1.  LOOSEN THE SET SCREWS (A), (B),AND (C), AND THEN, REMOVE THE FRONT COVER BY REMOVING THE SET SCREWS (D) ,(E),(F),(G),(H),(I)AND (J).
   NOTE: UNHOOK THE TAB (L) FROM THE REAR COVER WHEN REMOVING THE FRONT COVER.
   TO ATTACH:

2. FOLLOW THE ABOVE PROCEDURE IN REVERSE.

REAR COVER

TO REMOVE:

1. REMOVE THE FACE COVER AND FRONT COVER. (SEE PAGE 5)

2. LOOSEN THE SETSCREWS (A), (B) AND (C), AND REMOVE SETSCREWS (D), (E) AND (F).

3. PULL UP THE SPOOL PINS. REMOVE THE MACHINE SOCKET. REMOVE THE REAR COVER CLEARING THE PRESSER FOOT LIFTER FROM THE SLIT ON THE COVER.
   TO ATTACH:

4. FOLLOW THE ABOVE PROCEDURE IN REVRSE.

MECHANICAL ADJUSTMENT

TOP TENSION
THE TOP TENSION SHOULD BE BETWEEN 65 AND 95G WHEN PULLING THE THREAD UP IN THE DIRECTION OF C.

• USE POLYESTER SEWING THREAD #50 (WHITE).
• IF IT IS NOT WITHIN THE ABOVE LIMIT, ADJUST AS FOLLOWS
  1. SET THE TENSION DIAL “3”.
  2. REMOVE THE COVER.
  3. LOWER THE PRESSER FOOT.
  • IF THE TOP TENSION IS TOO LOOSE, TURN THE LEAD SCREW IN THE DIRECTION (A).
  • IF THE TOP TENSION IS TOO TIGHT, TURN THE LEAD SCREW IN THE DIRECTION (B).
  4.  CHECK THE TOP TENSION AND ATTACH THE COVER.

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).

IF THE TENSION IS OUT OF THE RANGE, ADJUST IT AS FOLLOWS:

ADJUSTMENT PROCEDURE:

1. TURN THE ADJUSTING SCREW (C) IN THE DIRECTION OF (D) WHEN THE BOBBIN THREAD TENSION IS TOO TIGHT.
2. TURN THE ADJUSTING SCREW (C) IN THE DIRECTION OF (E) WHEN THE BOBBIN THREAD TENSION IS TOO LOOSE.

PRESSER BAR HEIGHT AND ALIGNMENT

TO CHECK:

1. RAISE THE PRESSER FOOT LEVER (A).
2. THE DISTANCE BETWEEN THE PRESSER FOOT (D) AND THE NEEDLE PLATE (E) SHOULD BE 6.0MM (0.24″).

ADJUSTMENT PROCEDURE:

1. REMOVE THE FACE PLATE. (SEE PAGE 4.)

2. REMOVE THE SCREW (B) AND TAKE THE LAMP SOCKET OFF.

3. RAISE THE PRESSER FOOT LEVER AND LOOSEN THE SCREW (C) ON THE PRESSER BAR HOLDER.
   ADJUST THE DISTANCE BETWEEN THE PRESSER FOOT (D) AND THE NEEDLE PLATE (E) TO 6.0MM (0.24″).

4. TIGHTEN THE SCREW (C) SECURELY.

5. TIGHTEN THE SCREW (B) TO SECURE THE LAMP SOCKET.

6. ATTACH THE FACE PLATE.
   NOTE: WHEN YOU TIGHTEN THE SCREW (B), MAKE SURE THAT BOTH SIDES OF THE PRESSER FOOT ARE PARALLEL TO THE FEED DOG SLOTS (F) ON THE NEEDLE PLATE.

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).

ADJUSTMENT PROCEDURE:

1. SET THE PATTERN SELECTOR DIAL WITH MAXIMUM ZIGZAG WIDTH, AND REMOVE THE FRONT COVER. (SEE PAGE 5.)
2. LOOSEN TWO SET SCREWS.
3. ADJUST THE NEEDLE SWING BY TURNING THE HANDWHEEL, WHILE HOLDING THE WORM SO AS NOT TO ROTATE IT, UNTIL THE NEEDLE SWING STARTS AT 2 – 3MM ON THE NEEDLE PLATE AFTER THE NEEDLE HAS COME OUT OF THE RIGHT SIDE OF THE NEEDLE HOLE.
4. TIGHTEN TWO SET SCREWS.
5. MOUNT THE FRONT COVER.
   NOTE: AFTER ADJUSTING THE NEEDLE SWING, CHECK THAT THE UPPER SHAFT WORM AND GEAR ROTATE SMOOTHLY WITHOUT ANY BACKLASH BETWEEN THEM.

NEEDLE DROP

TO CHECK:
WHEN THE NEEDLE SWINGS IN MAXIMUM ZIGZAG WIDTH, THE DISTANCE BETWEEN THE BOTH ENDS OF NEEDLE HOLE ON THE NEEDLE PLATE AND THE NEEDLE DROP POSITIONS SHOULD BE EQUAL.
IF NOT, MAKE AN ADJUSTMENT AS FOLLOWS:

ADJUSTMENT PROCEDURE:

1. REMOVE THE FACE COVER. (SEE PAGE 4.)

2.  SET THE PATTERN SELECTOR DIAL AT MAXIMUM ZIGZAG WIDTH.

3. LOOSEN THE SET SCREW.

4.  TURN THE ECCENTRIC PIN TO ADJUST THE NEEDLE DROP.

5. TIGHTEN THE SET SCREW.
   NOTE: CHECK THE HOOK TIMING AFTER THIS ADJUSTMENT.

6.  ATTACH THE FACE COVER.

CLEARANCE BETWEEN NEEDLE AND HOOK (NO.1)

TO CHECK:
THE CLEARANCE BETWEEN NEEDLE AND SHUTTLE RACE SHOULD BE –0.05 –+0.10MM.

IF NOT, MAKE AN ADJUSTMENT AS FOLLOWS:

ADJUSTMENT PROCEDURE:

1. REMOVE THE FACE COVER. (SEE PAGE 4.)

2. SET THE PATTERN SELECT DIAL “ “.

3. LOOSEN SET SCREW (A), AND MOVE THE NEEDLE BAR SUPPORTER TO ARROWS
   TO GET CLEARANCE BETWEEN –0.05 TO +0.10MM.

   • WHEN CLEARANCE IS TOO WIDE, MOVE THE NEEDLE BAR SUPPORTER TO DIRECTION (B).
   • WHEN CLEARANCE IS TOO NARROW, MOVE THE NEEDLE BAR SUPPORTER TO DIRECTION (C).
     NOTE: AFTER THIS ADJUSTMENT, CHECK IF THE CLEARANCE BETWEEN NEEDLE AND NEEDLE PLATE IS MORE THAN 0.15MM AS SHOWN IN FIGURE (D).
     IF NOT, ADJUST THE CLEARANCE BETWEEN NEEDLE AND SHUTTLE RACE BY USING METHOD OF ADJUSTMENT NO.2 IN PAGE 13 AFTER READJUST THE CLEARANCE BETWEEN NEEDLE AND NEEDLE PLATE MORE THAN 0.15MM.

4. ATTACH THE FACE COVER.

FEED DOG HEIGHT

TO CHECK:

1. LOWER THE PRESSER FOOT.
2. 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.

ADJUSTMENT PROCEDURE:

1. OPEN THE SHUTTLE COVER.
2. LOWER THE PRESSER FOOT AND TURN THE HANDWHEEL TOWARD YOU UNTIL THE FEED DOG COMES TO ITS HIGHEST POINT.
3. LOOSEN THE SCREW (A) .
4. TURN THE FEED LIFTING PIN TO ADJUST THE HEIGHT OF FEED DOG (0.75–0.90 MM).
5. TIGHTEN THE SCREW (A).
6. TURN THE HANDWHEEL TOWARD YOU TO RECHECK THE HEIGHT OF FEED DOG.

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.

ADJUSTMENT PROCEDURE:

1. REMOVE THE FACE COVER.
2. SET THE PATTERN SELECTOR DIAL AT ” “.
3. OPEN THE SHUTTLE COVER.
4. REMOVE THE SHUTTLE RACE RING.
5. TURN THE HANDWHEEL TOWARD YOU UNTIL THE TIP OF THE SHUTTLE HOOK MEETS THE LEFT SIDE OF THE NEEDLE.
6. LOOSEN THE LOWER SHAFT CRANK ARM SCREW (A).
7. ADJUST THE HEIGHT OF THE NEEDLE BAR BY MOVING THE NEEDLE BAR UPWARD OR DOWNWARD WITHOUT TURNING IT.
8. TIGHTEN THE SCREW (A).
9. ATTACH THE SHUTTLE RACE RING.

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.

ADJUSTMENT PROCEDURE:

1. SET THE PATTERN SELECTOR DIAL AT “ ”.

2. REMOVE THE FRONT COVER (SEE PAGE 5).

3. OPEN THE SHUTTLE COVER.

4. REMOVE THE SHUTTLE RACE RING.

5. TURN THE HANDWHEEL TOWARD YOU UNTIL THE TIP OF THE SHUTTLE HOOK MEETS THE LEFT SIDE OF THE NEEDLE.

6. LOOSEN THE LOWER SHAFT CRANK ARM SCREWS (A).

7. WHILE HOLDING THE SHUTTLE HOOK SO IT DOESN’T TURN, TURN THE HANDWHEEL TOWARD YOU UNTIL THE NEEDLE COMES TO ITS LOWEST POSITION.
   THEN, FURTHER TURN THE HANDWHEEL TO RAISE THE NEEDLE ABOUT 1.7 MM FROM ITS LOWEST POSITION.

8. TIGHTEN THE SCREWS (A).

9. TURN THE HANDWHEEL TOWARD YOU TO CHECK IF THE HEIGHT IS IN THE RANGE OF 1.45-1.95 MM.
   IF IT IS NOT IN THIS RANGE, REPEAT THE ABOVE PROCEDURE.

10. ATTACH THE SHUTTLE RACE RING.

11. ATTACH THE FRONT COVER.

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” IS CONSIDERED ACCEPTABLE.

ADJUSTMENT PROCEDURE:

1. CONFIRM THE STITCHES BY SEWING BUTTONHOLES, AND REMOVE THE CAP.
2. TURN THE ADJUSTING SCREW IN THE DIRECTION OF (C) IN CASE OF (A) (RIGHT STITCHES ARE ROUGH), OR IN THE DIRECTION OF (D) IN CASE OF (B) (LEFT STITCHES ARE ROUGH).
3. MOUNT THE CAP.

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 STITCH PATTERN SEWING), MAKE AN ADJUSTMENT AS FOLLOWS:

ADJUSTMENT PROCEDURE:

1. REMOVE THE CAP.
2. SET THE PATTERN SELECTOR DIAL AT “ ” , AND THE STITCH LENGTH DIAL AT “S.S.”.
3. TURN THE STRETCH STITCH ADJUSTING SCREW IN THE DIRECTION OF (C) WHEN A > B, OR IN THE DIRECTION OF (D) WHEN A < B.
4. ATTACH THE CAP.

BARTACK FEED OF BUTTONHOLE

TO CHECK:
IF THE MATERIAL IS FED FORWARD OR BACKWARD WHEN SEWING BARTACK ON BUTTONHOLE,MAKE AN ADJUSTMENT AS FOLLOWS:

ADJUSTMENT PROCEDURE:

1. SET THE PATTERN SELECTOR DIAL AT “ “, AND THE STITCH LENGTH DIAL AT “4”.
2. REMOVE THE FRONT COVER (SEE PAGE 6).
3. PLACE A PIECE OF PAPER UNDER THE FOOT AND TURN THE HANDWHEEL.
   • IF THE PAPER IS FED FORWARD, TURN THE ADJUSTING SCREW IN THE DIRECTION OF (C).
   • IF THE PAPER IS FED BACKWARD, TURN THE ADJUSTING SCREW IN THE DIRECTION OF (D).
4. ATTACH THE FRONT COVER.

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, OR CAN NOT CORRECT PATTERN.

ADJUSTMENT PROCEDURE:

1. SET THE PATTERN SELECTOR DIAL “ “.

2. REMOVE THE FRONT COVER. (SEE PAGE 5.)

3. PUT THE CAM FOLLOWER TO THE ZIGZAG CAM (STRAIGHT CAM), AND ALSO PUT THE CAM FOLLOWER RELEASING ARM TO THE PATTERN SELECT CAM.

4. LOOSEN THE SETSCREW.

5. MOVE ADJUSTING PLATE IN THE DIRECTION OF ARROW UNTIL TO TOUCH TO THE RELEASING ARM AND TIGHTEN SETSCREW.
   NOTE: AFTER THIS ADJUSTMENT, CHECK THAT THE CLEARANCE BETWEEN THE ZIGZAG CAM AND THE CAM FOLLOWER IS 0.3MM WHEN PUTTING THE CAM FOLLOWER RELEASING ARM ONTO POSITION (A) OF PATTERN SELECT CAM.

6. ATTACH THE FRONT COVER.

MOTOR BELT TENSION

TO CHECK:

1. IF THE MOTOR BELT TENSION IS TOO TIGHT OR TOO LOOSE, IT CAN CAUSE A BELT
   NOISE: IF THE TENSION IS TOO TIGHT, IT CAN CAUSE THE MACHINE TO RUN SLOWLY AND THE MOTOR TO OVERLOAD; IF THE TENSION IS TOO LOOSE; IT CAN CAUSE THE BELT TEETH ON THE MOTOR PULLEY TO JUMP.

2. THE CORRECT MOTOR BELT TENSION IS WHEN THE DEFLECTION OF MOTOR BELT IS ABOUT 7MM (0.28″) – 9MM (0.36″). (WHEN PUSHING THE MOTOR BELT BY FINGER WITH A 300 GRAM LOAD.)

ADJUSTMENT PROCEDURE:

1. REMOVE THE REAR COVER. (SEE PAGE 6)
2. LOOSEN THE SCREWS (A) AND (B).
3. MOVE THE MOTOR UP OR DOWN TO ADJUST THE DEFLECTION ABOUT 7MM (0.28″) – 9MM (0.36″).
4. TIGHTEN THE SCREWS (A) AND (B).

WIRING

1. WIRING FOR MACHINE SOCKET UNIT

OILING

FACTORY LUBRICATED PARTS WILL PROVIDE YEARS OF HOUSEHOLD SEWING WITHOUTROUTINE OILING. HOWEVER, WHENEVER THE MACHINE IS BEING SERVICED, CHECK TO SEE IF ANY PARTS NEED TO BE LUBRICATED.

OIL
USE GOOD QUALITY SEWING MACHINE OIL AT THE POINTS (A, B, C, D, E) INDICATED BY BLACK ARROWS.

GREASE
WHITE GREASE IS RECOMMENDED FOR USE ON GEARS AND CAM SURFACES.
IT IS AN IMPROVED GREASE, AND IT CAN BE USED ON THE METAL AND PLASTIC PARTS WHICH POINTS ARE INDICATED BY THE WHITE ARROWS (F,G, & H).

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