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JUKI HZL-25Z, Service Manual, Page: 19 / 35

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JUKI HZL-25Z Service Manual Download Page 19

SECTION

      PAGE

2 - 10

1

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.
4.  Deviation of all stitches must be within 0.6 mm in forward direction (about 

2/3 of needle thickness).

Adjustment:

1.  Remove side cover.
2.  Insert the minus screw driver into the hole (1).
3.  Adjust the stitch length within the range of 0 - 0.6 mm by turning driver anti-

clockwise or clockwise.

Summary of Contents for HZL-25Z

Page 1: ...HZL 25Z SERVICE MANUAL SEWING MACHINE ...

Page 2: ... 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 Remove screw 1 and take out gear cover 2 Re assembling should be done in the reverse way ...

Page 3: ...ifter 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 Insert jut 6 of face cover 3 into hole 5 of arm 4 Fix screw 2 fitting face cover profile to arm profile ...

Page 4: ...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 Re assembling 1 Insert hook 6 of cover 2 into small window 7 of base cover 5 2 Set hook 4 of cover 2 into the inside of front cover 8 and fix by screw 1 9 ...

Page 5: ...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 Re assembling 1 Insert hook 7 of front cover 8 into small window 6 of base cover 5 2 Fix screws 1 2 and 3 putting front cover 8 upon arm profile Also fix securing plate 4 ...

Page 6: ...SECTION PAGE 1 5 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: ... 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 3 Fix clutch wheel d with screw and tighten it clockwise Disassembling should be done in reverse way ...

Page 8: ...ight 2 6 Feed dog longitudinal positioning 2 7 Feed dog lateral positioning 2 8 Feed dog timing Vertical Movement 2 8 Feed dog timing Lateral Movement 2 9 0 Feeding needle position 2 10 Buttonhole sewing 0 feeding 2 11 Balance of reverse stitch length 2 12 Balance of stitch length stretch stitch 2 13 Presser foot height 2 14 Needle height 2 15 Needle clearance to Shuttle 2 16 Needle timing to Shut...

Page 9: ...hole of needle plate Adjustment 1 Lay the machine 2 Loosen screw 1 and move L R positioner 2 to left or right for adjust ment 3 Tighten screw 1 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: ...int comes to the center of needle plate hole 4 Set machine at zigzag stitching C maximum width by turning selector dial 5 Turning hand wheel by hand move needle to right and left end and check if each clearance between needle and needle hole end of needle plate is equal Adjustment 1 Remove face cover 2 Loosen screw 1 3 Turning eccentric pin 2 adjust needle position 4 Tighten screw 1 after adjustme...

Page 11: ...needle plate surface 4 Following marked illustrations indicate wrong situation Adjustment 1 Remove front cover 2 Loosen one out of 2 screws 2 on worm gear 1 Another should be set temporarily 3 Holding hand wheel turn worm gear 1 and adjust the angle of worm gear against gear If side motion too early ð Turn worm gear 1 towards you If side motion too late ð Turn worm gear 1 away from you 4 Tighten 2...

Page 12: ...al 3 Lower needle to left side and its lowest position 4 Turn selector dial towards you anti clockwise and set it between zigzag stitching maximum width and blind stitching 5 Check if needle point moves about 0 35 mm from above 3 position to left Adjustment 1 Remove side cover 2 Turn screw 1 Less than 0 35 mm ð Turn it clockwise More than 0 35 mm ð Turn it anti clockwise ...

Page 13: ...esser foot 3 Set feed dog at highest position by turning hand wheel by hand 4 Check to see if feed dog height A is 1 0 mm from needle plate Adjustment Adjust feed dog height by inserting the minus screw driver into feed lifting arm 1 and moving it up or down Feed dog too low ð Turn the screw driver clockwise Feed dog too high ð Turn it anti clockwise ...

Page 14: ... front dog keeps clearance A to the needle plate hole 3 Move feed dog to the front end and see if front edge of center dog keeps clearance B to the needle plate hole Adjustment 1 Remove side cover 2 Move feed dog to its extreme front end position 3 Loosen screw 2 Moving feed dog forward or backward adjust the angle of arm 3 against feed shaft 4 4 Tighten screw 2 securely after adjustment keeping t...

Page 15: ...eed dog 3 Check if noise is not made 4 Check if feed dog keeps alignment against groove of needle plate Adjustment 1 Remove gear cover 2 Adjustment for above Checking 2 and 3 Loosen screw 2 of setting plate 1 and adjust by moving horizontal shaft assy 3 3 Adjustment for above Checking 4 Loosen 2 screws 4 Feed dog 5 must touch groove 6 of needle plate correctly ...

Page 16: ...ween needle point and needle plate sur face is within the range of 4 6 mm when top of feed dog reaches needle plate surface level Adjustment 1 Remove base cover 2 Loosen screw 2 of feed lifting cam 1 3 Adjust feed dog timing to needle by slightly rotating feed lifting cam 1 in either direction as shown To retard timing ð Turn the cam to A direction To advance timing ð Turn the cam to B direction 4...

Page 17: ... Check if total lateral movement B of feed dog during the period from Step 2 to Step 3 above is within the range of 0 1 0 3 mm Adjustment 1 Remove face cover 2 Loosen the screw 2 of feed rocking cam 1 3 Holding feed rocking cam turn hand wheel and adjust the angle of the cam to upper shaft To retard timing ð Turn hand wheel towards you To advance timing ð Turn hand wheel away from you 4 Tighten se...

Page 18: ...ing A 2 Place paper under presser foot and take 11 stitches without thread 3 Deviation of all stitches must be within 0 6 mm in forward direction about 2 3 of needle thickness Adjustment 1 Inserting the plus screw driver through the hole and adjust the screw inside of the machine Fig a ð Turn anti clockwise Fig d ð Turn clockwise ...

Page 19: ... 3 Place the paper under buttonhole guide and take 11 zigzag stitches without thread 4 Deviation of all stitches must be within 0 6 mm in forward direction about 2 3 of needle thickness Adjustment 1 Remove side cover 2 Insert the minus screw driver into the hole 1 3 Adjust the stitch length within the range of 0 0 6 mm by turning driver anti clockwise or clockwise ...

Page 20: ...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 Reverse stitch length is short ð Tighten the screw 3 lifting 2 up Reverse stitch length is long ð Tighten the screw 3 lowering 2 ...

Page 21: ...itch length control is normal position for stretch stitching If you select L stitch becomes A If you select S stitch becomes B 2 12 1 2 12 Balance of stitch length Stretch stitching NOTE Before checking follow Section 2 9 0 feeding needle position Adjustment 1 Remove side cover 2 Turn lever 1 in either direction to correct the condition Turn the lever 1 up ð Reverse stitch length becomes longer Tu...

Page 22: ...oot lever 3 Check and see if clearance A between needle plate and presser foot is about 5 5 mm Adjustment 1 Remove face cover 2 Loosen screw 2 of presser bar clamp 1 and adjust the height by verti cally sliding presser bar 3 3 Tighten screw 2 securely after adjustment keeping alignment of the foot against feed dog ...

Page 23: ...aight 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 Adjustment 1 Remove face plate 2 Loosen screw 2 of needle bar clamp 1 3 Vertically sliding needle bar correct the needle height 4 Tighten screw 2 securely checking needle hole side after adjustment ...

Page 24: ...ttle point A is 0 to 0 1 mm 6 Needle must not touch needle hole Adjustment 1 Remove face cover 2 Remove screw 1 and loosen screw 2 3 Move the shaft 3 of supporting assy To increase clearance ð Move shaft 3 away from you To decrease clearance ð Move shaft 3 towards you 4 After adjustment tighten screw 2 keeping shaft 3 from moving 5 Tighten screw 1 Check if needle does not touch needle hole after a...

Page 25: ...ment is to be made depending on situation A Needle touches front of needle hole Fig a 1 Loosen screws 4 5 2 Adjust needle clearance to shuttle by moving shuttle race assy 6 away from you A and tighten screws 4 5 3 Loosen two screws 7 Adjust backlash between lower shaft gear 8 and shuttle shaft gear 9 and tighten two screws 7 Adjustment if needle touches needle hole ...

Page 26: ...o left C Lower shaft gear 8 must always engage with shuttle shaft gear 3 Loosen screws 4 5 4 Adjust needle clearance to shuttle by moving shuttle race assy to wards you B direction PAGE 2 and tighten screws 4 5 5 Move lower shaft gear assy 14 along shaft and adjust backlash be tween lower shaft gear 8 and shuttle shaft gear 9 6 Tighten screws 11 12 Check following Checking rotating direction of sh...

Page 27: ...e 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 Turning hand wheel rotate shuttle driver 1 and locate the point of mini mum backlash 3 Check if the backlash is approximately zero at this point ...

Page 28: ...oint comes to align with left side of needle Check if clearance A between hook point and upper edge of needle eye is about 1 0 mm Adjustment 1 Loosen bolt 2 of lower shaft arm 1 2 Rotate shuttle with finger until hook point comes to align with the left side of needle 3 Holding shuttle at this position slowly bring up needle until the correct ver tical clearance is attained between shuttle hook poi...

Page 29: ...adjustment can not be made if belt tension is too loose Then loosen screw 2 and adjust belt tension turning eccentric roller 3 Control panel Selector dial Gear 2 17 1 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 ...

Page 30: ... moving motor and tighten screws 1 Reference Belt is bent about 7 mm when pushing middle portion of belt between upper shaft and motor with pressure of 200 g 2 18 1 Pressure 2 18 Belt tension Belt tension should be adjusted in case of belt jumping on heavy material sewing or slow rotation ...

Page 31: ...to stopper pin 8 tighten stopper screw 5 Make sure to align the screw 5 with the screw 7 on needle bar clamp 6 Checking 1 Check and see if 14 needle is used and it is not bent 2 Set machine for Straight Stitch at center needle position 3 Raise the needle to its highest position by rotating the hand wheel towards you 4 Lowering needle hole threader lever check and see if hook 1 inserts into needle ...

Page 32: ...k pin 3 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 ...

Page 33: ...aximum Left Right 2 20 1 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 Lower part is wound too much c ð Bent to left side Upper part is wound too much a ð Bent to right side ...

Page 34: ... 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: ...ht 2007 JUKI CORPORATlON All right reserved throughout the world 40058010 2007 01 8 2 1 KOKURYO CHO CHOFU SHI TOKYO 182 8655 JAPAN PHONE 03 3480 5034 FAX 03 3480 5037 http www juki co jp E mail hsm juki co jp ...

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