Service Manual - Juki – Masini de cusut casnice
Contents
1. 2 Turn the shuttle by 90 degrees twice and check if there is no big play 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 plav turn it clockwise There is too much plav turn it counter clockwise Mark D on ball metal A should be positioned at upper half within 180 degrees 4 Tighten the screw B securelv after adjustment Attention After the adjustment please check 11 Needle timing to shuttle point 1 l Model Checking 1 Set the dial at 5 2 Put the polyester 60 thread between tension discs and pull it to check tension 3 Recommended dial 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 value of tension Service Manual Adjustment 1 Remove outer covers 2 Loosen and adjust two nuts A Belt need to bend about 7mm when it is pushed bv pressure of 200g between upper shaft and motor 3 lighten two nuts A after2. Service Manual Model HZL 27Z HL py gt MODEL HZL 272 JUKI HOUSEHOLD SEWING MACHINE CORPORATION service Manual Model 1 Disassembling face covers 2 Feed dog height 3 Needle height 4 Hooking fork position 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 service Manual Page 3 24 Model 1 Disassembling face covers 1 HZL 27Z 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 service Manual Page 4 24 Model 1 Disassembling Face cover 2 HZL 27Z 3 Remove a screw on front cover 4 Remove switch cover by small screw driver Shape of terminal block is different by destination 5 Use small driver to remove the connection between front cover and back cover service Manual Page 95 24 Model 3 Disassembling face cover 3 HZL 27Z 6 Put your hand inside to disconnect side portions 7 Insert the switch cover to th
3. adjustment Original issue service Manual Model 14 Bobbin case rotation stopper 1 1 Remove needle plate and take off bobbin case 2 Check if the corner of square spring come to inside of shuttle frame A as illustrated below Square spring Rotation topper 3 Loosen screw B and move rotation stopper to arrow direction and tighten screw B temporarilv Square spring ProjectiO q pring 4 Insert the bobbin case to touch the lug to square spring as illustrated above 5 Tighten the screw B securely Page 21 24 service Manual Page 22 24 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 Service Manual 15 Pitch balance of buttonhole sewing HZL 2 2 There is stitch length adjusting zone on stitch length dial Adjustment is done on this dial Forward pitch can be changed by Stitch 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
4. shuttle point service Manual Model Check and adjustment If the fork position is wrong correct the condition using small screw driver in accessory box and adjust the position l Model Checking 1 Raise the presser foot lever 2 Lower the feed dog below the needle plate 3 Check and see if clearance between needle plate and presser foot is about 5 5 to 6 mm 5 5 gt 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 l Model Checking Check if the needle point of straight stitching at center needle position comes to the center of 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 Service Manual Model 7 M position HZL 27Z Attention Confirm 6 Needle position at straight stitching before this checking Checking 1 Set machine for straight stitching at center needle position 2 Turning hand wheel by hand l
5. 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 two screws securely Timing pulley Attention After adjustment please check 11 Needle timing to shuttle point 1 Original issue Mav 2009 Page 17 24 Service Manual Model 11 Needle timing to shuttle point 1 HZL 27Z Attention Check 3 Needle height and 10 Needle and feed dog timing beforehand Checking 1 Set zigzag stitch length at maximum 2 Check if needle is not bent and remove needle plate and bobbin case 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 0 5 1 2 mm Shuttle point 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 Lower shaft gear PI ee s Back side view 3 Tighten screws securely after adjustment Service Manual Model 11 Needle timing to shuttle point 2 HZL 27Z Additional check check the engagement between shuttle gear and lower shaft gear gt 1 After adjustment check engagement of the gear
6. e 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 service Manual Page 6 24 Model 1 Disassembling face cover 4 HZL 27Z 3 Remove front cover and top plate 1 Pull out stitch length dial and pattern select dial l Model Checking 1 Move 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 0 89 1 09 mm 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 j ole F service Manual Page 8 24 Model 3 Needle height HZL 27Z Attention Confirm this step before 11 Needle timing to shuttle point Checking 1 Select straight stitching with needle point at the center Needle point comes to the center of 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 Needle is at center highest position Need 15 440 3 mm clearance from the needle plate Adjustment 1 Remove face cover 2 Loosen screw A which fixes needle bar and adjust needle height a Attention After adjustment check 11 Need le timing and
7. osen 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 Original issue Mav 2009 Page 15 24 Model 9 Timing belt tension HZL 27Z liming belt is connecting with upper and lower shafts Service Manual If the tension is too loose belt may jump or slip laterally and cause 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 EY iee Attention After adjustment check 10 Feed dog timing and 11 Needle timing to shuttle point 1 Original issue Mav 2009 Page 16 24 Model 10 Feed dog timing HZL 27Z Checking 1 Set stitch length at maximum Service Manual 2 Turn hand wheel toward you check whether feed dog starts to move in horizontal direction when or before needle reaches its highest position 3 The travel distance of feed dog is O to 0 5 mm when needle reaches its highest position pa eee E 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
8. ower 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 Original issue Mav 2009 Page 13 24 Model HZL 27Z Service Manual 8 Needle clearance to shuttle point 1 Checking 1 Remove needle plate bobbin case and face cover 2 Set zigzag stitch width at maximum 3 Turning hand wheel until needle is moved to right left and shuttle point to the rear of needle check if each clearance between needle and shuttle point on right and left is O to 0 1 mm noncontact 0 0 1mm Zigzag maximum Zigzag maximum width at left side width at right side 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 Don t loosen nut C Service Manual Model 8 Needle clearance to shuttle point 2 HZL 27Z NEEDLE l l ii B j B B ji If the clearance of needle and If the clearance of needle and shuttle is smaller on left side shuttle is smaller on right side adjust support unit B toward adjust support unit B toward right left Tighten the bolt A after adjustment 1 If the clearance of needle and shuttle point is not 0 to 0 1 mm lo
9. reverse pitch as shown below 5mm Reverse stitch 10 to 15 stitches in 5mm l Model 1 Turn the screw A and adjust the stitch length If you don t remove the front 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 Forward is small Forward is large Both pitches are reverse is large reverse is small well balanced
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