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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. 

 Eliminate the looseness. 

   

  

     

3.  Inappropriate belt tension.   

 See mechanical adjustment  

P. 22

     

   

 “Motor belt tension.”

   

  

 

     

4. Upper shaft gear is loose.  

 Eliminate the looseness.

     

5.  Not enough oil.  

 Oil all moving parts. 

  7.  Deformation of  1.  Inappropriate zigzag  

 See mechanical adjustment  

P. 11

    pattern   

  synchronization. 

 “Needle swing.” 

   

  

 

     

2.  Inappropriate disengagement 

 See mechanical adjustment  

P. 21

     

  of cam follower.  

 “disengagement of cam follower.”

   

  

   

  

 

     

3.  Upper thread tension is too  

 Adjust upper thread tension  

P. 8

   

 strong. 

 

correctly.

    
     

4.  Inappropriate feed balance  

 See mechanical adjustment  

P. 19

     

  BALANCE 

 "Feed balance on stretch stitch."

   

  

 

  

Summary of Contents for 13512

Page 1: ...SERVICE MANUAL MODEL 13512 14412 15312...

Page 2: ...AND ALIGNMENT 10 NEEDLE SWING 11 NEEDLE DROP 12 CLEARANCE BETWEEN NEEDLE AND HOOK ADJUSTMENT METHOD NO 1 13 CLEARANCE BETWEEN NEEDLE AND HOOK ADJUSTMENT METHOD NO 2 14 FEED DOG HEIGHT 15 NEEDLE BAR H...

Page 3: ...6 Inappropriate needle bar See mechanical adjustment P 16 height Needle bar height 7 Inappropriate needle to hook See mechanical adjustment P 17 timing Needle timing to shuttle 8 Inappropriate needle...

Page 4: ...ad 2 Too much thread is around on Adjust the position of stopper the bobbin 3 Lint is stuck inside the hook Clean the hook race race 4 Thread quality is too low Change to a high quality sewing thread...

Page 5: ...Motor belt tension 4 Upper shaft gear is loose Eliminate the looseness 5 Not enough oil Oil all moving parts 7 Deformation of 1 Inappropriate zigzag See mechanical adjustment P 11 pattern synchroniza...

Page 6: ...4 A Face cover SERVICE ACCESS 1 FACE COVER To remove 1 Remove the face cover by removing the setscrew A To attach 2 Mount the face cover in reverse procedure of the removing...

Page 7: ...5 Base plate A SERVICE ACCESS 2 BASE PLATE To remove 1 Remove the setscrews A 2 Remove the base plate To attach 3 Mount the base plate in reverse procedure of the removing...

Page 8: ...t 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 remove the front cover TO ATTACH 2 Follow the above proce...

Page 9: ...e 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 frome the slit on the...

Page 10: ...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...

Page 11: ...ing 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 i...

Page 12: ...face cover See page 4 2 Raise the presser foot lever and loosen the setscrew C on the presser bar holder Adjust the distance between the presser foot D and the needle plate D to 6 0 mm 0 24 3 Tighten...

Page 13: ...pattern selector dial with maximum zigzag width and remove the front cover See page 6 2 Loosen two setscrews 3 Adjust the needle swing by turning the handwheel while holding the worm so as not to rot...

Page 14: ...eedle hole on the needle plate and the needle drop positions should be equal If not adjust as follows Adjustment procedure 1 Remove the face cover See page 4 2 Set the pattern selector dial at maximum...

Page 15: ...is too wide move the needle bar supporter to direction B If clearance is too narrow move the needle bar supporter to direction C NOTE After this adjustment check that the clearance between the needle...

Page 16: ...e between the needle and the shuttle race in the range of 0 05 to 0 10 mm 5 Set the pattern select dial at turn the handwheel to check if the clearance between the needle and inner edges of the shuttl...

Page 17: ...om the needle plate should be 0 75 0 90mm 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...

Page 18: ...ye and the tip of the shuttle hook should be in the range of 2 9 3 5 mm Adjustment procedure 1 Open the face cover 2 Set the pattern selector dial at 3 Open the shuttle cover 4 Remove the shuttle race...

Page 19: ...en 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 Wh...

Page 20: ...itch 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 Check the stitch...

Page 21: ...etting 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...

Page 22: ...ttonhole 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 fo...

Page 23: ...rn Adjustment procedure 1 Set the pattern selector dial 2 Remove the front cover See page 6 3 Put the cam follower to the zigzag cam straight cam and also put the cam follower releasing arm to the pat...

Page 24: ...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 finge...

Page 25: ...socket unit B Machine socket cover WIRING 1 Remove the belt cover See page 4 2 Remove the screws A B and machine socket cover 3 Follow the above procedure in reverse Motor cord Lamp cord Motor cord L...

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