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JUKI HZL-25Z, Service Manual, Page: 27 / 35

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JUKI HZL-25Z Service Manual Download Page 27

SECTION

      PAGE

2 - 15

4

Checking rotating direction of shuttle race assy:

Align needle with the 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.

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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