JUKI HZL-30Z, Service Manual

Page 1: ...SERVICE MANUAL HZL 30Z Portable Zigzag Sewing Machine ...

Page 2: ...pecially keep the following 4 1 Adjusting the needle bar height 7 4 2 Adjusting the zigzag width needle entry position 7 4 3 Adjustment of the straight stitch lock 8 4 4 Needle throw 9 4 5 Feed dog height 10 4 6 Timing belt 10 4 7 Feed timing 11 4 8 Needle to hook timing 11 4 9 Clearance between the needle and the blade point of the hook 12 4 10 Position of the bobbin case stopper plate 12 4 11 Ad...

Page 3: ...matic threading devive Normal 6 mm Max 9 mm Changeover of 17 steps by pattern dial Straight stitch 2 kinds of left stitch base line and center stitch base line Zigzag stitch Fixed zigzag width type 3 kinds of 1 67 mm 3 33 mm and 5 mm Straight stitch for elastic Blindstitch Blindstitch for elastic 3 step zigzag stitch Scallop stitch Buttonholing 2 step type Overcasting Patchwork Stretch reinforcing...

Page 4: ...esser foot Hook cover release button Hook cover Bobbin Needle Thread spool cap Bobbin thread guide Thread tension dial Spool pin Bobbin winder shaft Bobbin winding regulator Stitch length dial Face cover Auxiliary bed Reverse stitch lever Pattern display panel Hand wheel Stitch pattern dial Light switch Speed controller receptacle Presser foot lever Cover for buttonhole adjusting ...

Page 5: ... 1 in the face cover and remove the face cover Remove setscrews 2 and 3 in the throat plate and remove the throat plate Remove setscrews 4 5 and 6 in the rubber cushion of the base plate setscrew 7 of the base plate and height adjusting screw 8 Base plate is removed Remove setscrew 9 in the free arm bottom cover 1 2 3 6 5 4 7 8 9 ...

Page 6: ...as asm Lift the presser lifting lever when removing screw 15 Remove setscrew upper 16 in the thread spool cover and setscrew side 17 in the thread spool cover Lower the thread take up support and insert a screwdriver from the face cover side to remove setscrew side 17 in the thread spool cover Open the rear panel in the rear and remove the thread spool cover upward Thread take up support 10 11 12 ...

Page 7: ...e front panel main unit after removing the thread spool cover Draw out pattern dial 21 knob There are hooking sections on the rear sides of both front and rear panel as illustrated in the figures below They are engaging with the frame holes and engaging with the respective covers marksection marksection 18 20 19 Rear panel Front panel Rear panel Front panel Rear panel Front panel Rear panel Front ...

Page 8: ...he rear panel and the joint section of the whole panel is removed Note Remove the rear panel so as to bring the rear panel near the hand wheel side at the place of the power switch installing plate since there is a convex shape on the rear panel Front panel Remove the convex sections of the front panel and the rear panel from the frame so as to move the convex sections up from the frame in the sam...

Page 9: ...ar and adjust the height of the needle bar in the same way as the adjusting procedure above so that a distance of 14 83 mm is provided between the top surface of the throat plate and the tip of the needle when the needle bar is in the highest point of its stroke Setscrew 1 can be loosened at the position where the needle bar is in the lowest point of its stroke Adjustment How to adjust 1 How to ad...

Page 10: ...at plate 3 Turn the adjusting screw in the figure and adjust so that the lateral play of the needle bar becomes 0 to 1 mm 0 2 to 0 3 mm is recommended No lateral play Change of the needle entry point uneasy movement of the stitch pattern dial uneven rotation Excessive lateral play The movement of the needle bar is excessive when threading Adjustment 8 8 8 8 8 Worm gear Timing belt Feed knob Needle...

Page 11: ... cover 1 Turn the stitch pattern dial and select the zigzag width maximum zigzag width 2 Loosen the setscrew No 2 of the worm gear 2 mm hexagon screwdriver 3 Raise the needle from the lowest point so that the tip of the needle comes to the upper face of the throat plate At this time if the needle throws loosen the setscrew No 1 holding the handwheel by hand so that the handwheel does not turn 4 In...

Page 12: ...y comes down when it is pressed from the upper side How to adjust Screwdriver When shaft b is loosened shaft a comes in contact with the cam and a clearance is provided between the cam and the top end c of the shaft 4 6 Timing belt Remove the outer components Front cover rear cover and face cover 1 Loosen the setscrew in the idler installing base and loosen the tension of the timing belt 2 Turn th...

Page 13: ...bar by hand and stop it at point C where the center of the needle aligns with the top end of the blade of the hook 5 At this time make sure that dimension D from the top end of the blade of the hook to the upper end of the needle eyelet is 1 06 to 1 26 mm When the dimension is not proper perform the adjustment below 1 Loosen the setscrew in the hook drive gear which is hidden as observed from the ...

Page 14: ...the needle bar lateral adjusting plate asm and move the needle bar lateral adjusting plate asm to the left or right to adjust the clearances How to adjust Drive body stop shaft 2 Blade point of hook 4 10 Position of the bobbin case stopper plate Remove the throat plate 1 On condition that the bobbin case is set to the outer hook loosen setscrew 3 and determine the longitudinal position of the bobb...

Page 15: ... in contact with bobbin case Tension gauge Tension gauge 4 12 Opening amount of the tension disk Remove the face cover and the front panel 1 Turn the adjusting screw in the thread tension disk floating plate and adjust so that the clearance between tension disk A and tension disk B is 1 mm when the thread tension dial is set to the maximum and the presser lifting lever is raised How to adjust Adju...

Page 16: ...el How to adjust 4 14 Tension knob The tension knob has the structure which can make the correction when the needle thread tension is desired to be corrected after assembling the front panel and the thread spool cover 1 In case of increasing the needle thread tension 1 Turn the tension knob in the direction of a until it comes in contact with the stopper 2 Move shift the tension knob to the right ...

Page 17: ...ook holder in the vertical direction When the hook is low Move the threader hook holder in the upper direction When the hook is high Move the threader hook holder in the lower direction 3 Bring the threader lever to the lowest point of its stroke and check that the clearance provided between the upper end of the threader hook and the upper end of the needle eyelet is 0 to 0 1 mm When this dimensio...

Page 18: ...usting screw 4 18 Height and position of the presser foot Remove the face plate 1 Set the presser foot for zigzag stitch and when the presser foot lever is raised loosen the setscrew of the presser bar guide and move the presser bar up or down so that the presser foot is 6 mm above the upper face of the throat plate 2 5 mm hexagon screwdriver 2 At this time determine the rotating direction of the ...

Page 19: ... so that the feed pitch of the stitches on the right and left sides should be equal If the adjusting screw is turned the feed pitch of the stitches on the right side will vary In this case set the pitch to the feed pitch of the left side Turn the adjusting screw clockwise Increase the feed pitch of the stitches on the right side Turn the adjusting screw counterclockwise Reduce the feed pitch of th...

Page 20: ...APPLIANCE H Q 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHONE 81 3 3480 5034 FAX 81 3 3480 5037 04 01 Printed in Japan Copyright 2004 JUKI CORPORATION All rights reserved throughout the world 29366200 ...