JUKI HZL-27Z, Service Manual

Page 1: ...Page 1 24 Original issue May 2009 Service Manual HZL 27Z Model MODEL HZL 27Z JUKI HOUSEHOLD SEWING MACHINE CORPORATION ...

Page 2: ... of needle threader 5 Presser foot height 6 Needle position at straight stitching 7 M position 8 Needle clearance to shuttle point 9 Timing belt tension 10 Feed dog timing 11 Needle timing to shuttle point 12 Thread tension 13 Belt tension 14 Bobbin case rotation stopper 15 Pitch balance of buttonhole sewing 16 Balance of stitch length on stretch stitching ...

Page 3: ...HZL 27Z Model 1 Disassembling face covers 1 1 Remove face cover Remove 2 screws and take out face cover 2 Remove back cover 1 Remove 3 screws on base cover Screw A fixes switch cover It is released with rubber foot 2 Remove 4 screws from back cover Ａ ...

Page 4: ... HZL 27Z Model 1 Disassembling Face cover 2 3 Remove a screw on front cover 4 Remove switch cover by small screw driver 5 Use small driver to remove the connection between front cover and back cover Shape of terminal block is different by destination ...

Page 5: ...Model 3 Disassembling face cover 3 6 Put your hand inside to disconnect side portions 7 Insert the switch cover to the inside of machine lower presser foot and pull up cover near presser foot not to stuck at the lever then pull the back cover behind to remove ...

Page 6: ...el 1 Disassembling face cover 4 3 Remove front cover and top plate 1 Pull out stitch length dial and pattern select dial 2 Loosen 2 screws on thread guide plate and bend it to remove the front cover 3 Pull up the top plate to complete disassembling outer covers ...

Page 7: ... the feed dog to its highest position by turning hand wheel Confirm if the feed dog height is 0 89 1 09 mm from needle plate Adjustment 1 Remove needle plate 2 Turn the screw A to adjust the height Feed dog is too low Turn it clockwise Feed dog is too high Turn it counter clockwise 0 89 1 09 ｍｍ Ａ ...

Page 8: ...the needle plate hole Raise the needle to the highest position by turning hand wheel ２ Check and see if the distance between the highest needle point and needle plate surface is 15 4 mm 0 3 mm as below Adjustment 1 Remove face cover 2 Loosen screw A which fixes needle bar and adjust needle height Attention After adjustment check 11 Need le timing and shuttle point Need 15 4 0 3 mm clearance from t...

Page 9: ...sue May 2009 Service Manual HZL 27Z Model 4 Hooking fork position of needle threader Check and adjustment If the fork position is wrong correct the condition using small screw driver in accessory box and adjust the position ...

Page 10: ...needle plate 3 Check and see if clearance between needle plate and presser foot is about 5 5 to 6 mm Adjustment 1 Remove face cover and raise the presser foot lever 2 Loosen screw A of needle bar clamp and adjust the presser foot height by vertically sliding presser bar 3 Tighten screw after adjustment keeping alignment of the foot with feed dog 5 5 6 ｍｍ Ａ ...

Page 11: ...f the maximum zigzag bight Notify pinhole on paper for easy checking Adjustment 1 Remove face cover 2 Insert hex driver Dia 2 mm length over 100mm from thread guide plate hole and turn alignment screw A Center needle position is shifted to right Turn it clockwise Center needle position is shifted to left Turn it counter clockwise Attention Check 7 M position after adjustment Ａ Ａ When front cover i...

Page 12: ... 1 Set machine for straight stitching at center needle position 2 Turning hand wheel by hand lower the needle and check if needle point comes to the center of needle plate hole Adjustment 1 Remove front cover Adjust by turning screw A Center needle position is shifted to right Turn it clockwise Center needle position is shifted to left Turn it counter clockwise Ａ ...

Page 13: ... right left and shuttle point to the rear of needle check if each clearance between needle and shuttle point on right and left is 0 to 0 1 mm noncontact Adjustment 1 If the needle point is different on right and left adjust the support position which swings needle Loosen bolt A and move support unit B to adjust B 0 0 1ｍｍ 0 0 1ｍｍ 0 0 1ｍｍ Shuttle point C Don t loosen nut C A Zigzag maximum width at ...

Page 14: ...n a nut D on support axis and turn the axis E to move it to front or back Clearance is too large Turn it counter clockwise Clearance is too small Turn it clockwise Tighten the nut D after adjustment Ｄ Ｅ If the clearance of needle and shuttle is smaller on left side adjust support unit B toward right If the clearance of needle and shuttle is smaller on right side adjust support unit B toward left N...

Page 15: ...e gap on upper and lower shaft If the tension is too tight torque is increased and it is unable to keep correct number of revolutions Adjustment 1 Remove front cover 2 Loosen screw A and adjust position of idler pulley B 3 After adjustment tighten screw A securely and confirm the timing of needle and shuttle hook Attention After adjustment check 10 Feed dog timing and 11 Needle timing to shuttle p...

Page 16: ...hen needle reaches its highest position Adjustment 1 Remove front cover 2 Loosen two screws for timing pulley on lower shaft and release the connection of upper and lower shafts and adjust by turning pulley Feed dog moves too fast Turn pulley toward front Feed dog moves slow Turn pulley toward back 3 Tighten one of the screws temporarily and check the feed dog movement 4 After adjustment tighten t...

Page 17: ...se 3 Move needle to left lowest position Raise needle from the lowest point When shuttle point aligns with right side of needle check whether the clearance of needle and shuttle point within the clearance specified below Adjustment 1 Remove front cover 2 Loosen two screws on lower shaft and adjust the position Firstly tighten one of the screws and check if the position is as specified above 3 Tigh...

Page 18: ...ay on gear 3 Adjust the play between shuttle gear and lower shaft gear by turning eccentric ball metal Loosen screw B on plate to allow ball metal to rotate Turn ball metal A by using concavity C There is too little play turn it clockwise There is too much play turn it counter clockwise Mark D on ball metal A should be positioned at upper half within 180 degrees 4 Tighten the screw B securely afte...

Page 19: ...tension is 40 to 50 g Bobbin case tension is 14 to 18 g Check the balance of upper and lower threads by sewing zigzag stitch Adjustment 1 Remove front cover 2 Remember the current dial position 3 Remove screw and take off the dial 4 Shift engagement point of gear Tension is too weak Set to larger value Tension is too strong Set to smaller value Shift engagement point of gear to change standard val...

Page 20: ...ice Manual HZL 27Z Model 13 Belt tension Adjustment 1 Remove outer covers 2 Loosen and adjust two nuts A Belt need to bend about 7mm when it is pushed by pressure of 200g between upper shaft and motor 3 Tighten two nuts A after adjustment A ...

Page 21: ...eck if the corner of square spring come to inside of shuttle frame A as illustrated below 3 Loosen screw B and move rotation stopper to arrow direction and tighten screw B temporarily 4 Insert the bobbin case to touch the lug to square spring as illustrated above 5 Tighten the screw B securely Projectio Square spring Rotation topper Square spring B ...

Page 22: ...27Z Model 14 Bobbin case rotation stopper 2 6 Loosen screw C and move the bobbin case front and back to keep the clearance of 1 1 5 mm with square spring when adjusting the reverse rotation stopper position 7 Tighten the screw C securely after adjustment C ...

Page 23: ...ch length dial Reverse pitch is fixed If you need to change reverse pitch follow the steps below 1 Adjust reverse pitch by turning screw A To adjust without taking off the front cover insert the screw driver from hole B on side and turn the screw A Reverse pitch is larger Turn it clockwise Reverse pitch is smaller Turn it counter clockwise 2 Adjust the reverse pitch as shown below Ａ Ｂ 10 to 15 sti...

Page 24: ...ront cover insert screw driver into hole B on top panel and turn the screw A Forward stitch is small reverse stitch is large Turn it clockwise Forward stitch is large reverse stitch is small Turn it counter clockwise 2 Adjust the stitch balance of forward and reverse stitches as below Ｂ Forward is small reverse is large Forward is large reverse is small Both pitches are well balanced Ａ ...