JUKI LH-3500A series Instruction Manual Download Page 1

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INSTRUCTION MANUAL

LH-3500A Series

Summary of Contents for LH-3500A series

Page 1: ...INSTRUCTION MANUAL LH 3500A Series ...

Page 2: ...tion 30 5 2 Hand lifter 30 5 3 Adjusting the pressure of the presser foot 31 5 4 Micro lifter 31 5 5 Thread tension release changeover when using the knee lifter 32 5 6 One touch manual reverse feed One touch reverse feed type 32 6 MAINTENANCE 33 6 1 Procedure of changing over between bottom feed and needle feed and the adjustment for LH 3528A only 33 6 2 Changing the feed timing 35 6 3 Adjusting ...

Page 3: ...l LWA A weighted value of 90 5 dB Includes KpA 2 5 dB according to ISO 10821 C 6 2 ISO 3744 GR2 at 3 000 sti min Model name LH 3568A with incorporating corner stitching LH 3568A 7 with automatic thread trimmer incorporating corner stitching Application For light medium and heavy weight materials S type standard G type jeans Hook Standard hook Standard hook Thread trimmer Not provided Provided Sepa...

Page 4: ... 2 5 dB according to ISO 10821 C 6 2 ISO 3744 GR2 at 3 000 sti min Model name LH 3588A with incorporating corner stitching LH 3588A 7 with automatic thread trimmer incorporating corner stitching Application For medium and heavy weight materials G type jeans Hook Large hook Large hook Thread trimmer Not provided Provided Separately driven needle bar mechanism Provided Provided Max sewing speed 3 00...

Page 5: ...3588A 3588A 7 Thread take up cover Finger guard Thread tension controller Control box Pedal Knee pad Power switch Reverse feed switch LH 3528A 7 3568A 7 3528A F type 3578A 7 3588A 7 Operation panel Bobbin winder Thread stand Oil supply opening Reverse feed control lever Hand lifter lever ...

Page 6: ...1 Caution at the time of set up 2 Caution when placing the sewing machine LH 3528A 3568A 3578A 3588A LH 3528A 7 3568A 7 3578A 7 3588A 7 Hold and transport the sewing machine with two persons as shown in the illustration When carrying the sewing machine take extreme care not to hold the thread tension controllers by hand If you hold the thread tension controllers by hand they can break ...

Page 7: ... operator s side using nails as illustrated above Fix two cushion seats on side B hinged side using a rubber based adhesive Then place under cover on the fixed seats 1 Installing the under cover 5 Detach inlet port for circulation which is fixed on the feed box cover Insert the inlet port into filter until it will go no further without fail and place them in opening C Place urethan filter on D and...

Page 8: ...he table and tight en nut gently When you use power supplied by the overhead pow er line pass the power supply cord through hollow spool rest rod WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning the power off and ascertaining that the motor is at rest 300 mm from the top surface of table Do not operate the sewi...

Page 9: ...tion of the feed box cover until it will go no further to put it into the state as it has been delivered to your plant Drain oil dropped into the under cover by remov ing drain screw Filter for circulation Urethan filter Plunger 4 PREPARATION OF THE SEWING MACHINE Circulation Lubrication to hook side Filter for plunger Lubrication Oil tank Ball float case Oil inlet filter Reflux oil from hook 1 Me...

Page 10: ...f oil adheres to your eyes or other parts of your body 3 If oil is mistakenly swallowed diarrhea or vomitting may occur Put oil in a place where children cannot reach For the first time you fill the oil tank with oil add 280 cc of oil as a guide and check to be sure that the oil amount indicating rod works If the oil amount indicating rod does not work bring it to the workable state by tiling the ...

Page 11: ...l from the oil tank loosen and re move oil confirming window WARNING 1 To prevent accidents caused by abrupt start of the sewing machine do not connect the power plug until draining of oil has been completed 2 To prevent the occurrence of an inflammation or rash immediately wash the related portions if oil adheres to your eyes or other parts of your body 3 If oil is mistakenly swallowed diarrhea o...

Page 12: ...ed screwdriver Part No B9101490000 and remove it 4 Draw out oil wick inserted into oil plug and replace it with a new one Part No of oil wick After the replacement assemble oil plug inner hook and hook gib to the hook by reversing the above procedure Perform confirming of oil splash 4 5 Oil in the feed box When using the sewing machine make sure that the oil is put in the feed box from oil confirm...

Page 13: ...applying sections of the respective models with the cotton bar or the like When using SC 920 when the time of grease up comes the warning alarm sounds When the alarm sounds perform grease up LH 3528A 3528A 7 3578A 3578A 7 WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning the power off and ascertaining that the m...

Page 14: ...ease has been soaked after removing old grease adhered to the inside of the hole and the felt Further pour grease above the felt and cover it with the rubber cap LH 3568A 3568A 7 3588A 3588A 7 Common A Thread take up lever oil wick Needle bar bracket Needle bar Square block Felt Face plate lubrication felt ...

Page 15: ...rn OFF the power to the unit 2 Pressing switch turn ON the power to the unit 3 When the screen is displayed keep switch held pressed for three seconds until the buzzer sounds twice 4 Set the setting No to 118 When you want to advance the setting No press switch to advance the setting No When you want to return the set ting No press switch to return the setting No Keep pressing switch or switch and...

Page 16: ...e current set value is displayed on LED Then Press switch switch to change to 1 6 When the change has been com pleted press switch or to specify the changed value 4 7 Setting up the SC 920 Supply voltage 3 phase 200 to 240V Frequency 50Hz 60Hz Operating envi ronment Temperature 0 to 40 C Humidity 90 or less Input 320VA 1 Specifications 2 Installing on the table LH 3528A 7 3568A 7 3578A 7 and 3588A...

Page 17: ...e fixed on the table in a wrong installing direction or with the hole located at a wrong position the control box cannot be installed Away from the operator side Away from the operator side 3 Fix control box mounting plates assembled in step 2 on the table with decoration bolts washers spring washers and nuts Screw A at one location this side as observed from the operator should be securely tighte...

Page 18: ...P THE SEWING MACHINE or Machine head list on the sepa rate sheet for the types of machine heads 3 After selecting the type of machine head by pressing switch switch the step proceeds to 96 or 94 and the display automat ically changes to the contents of the setting corresponding with the type of machine head For the operation panel other than CP 18 refer to the Instruction Manual for the operation ...

Page 19: ...r switch 2 is displayed in the in dicator and the mode is changed over to the adjustment mode 3 Turn the pulley of the machine head by hand until the main shaft reference signal is detected At this time the degree of an angle from the main shaft reference sig nal is displayed on the indicator The value is the reference value 4 In this state align the white dot of the hand wheel with the concave of...

Page 20: ...lt cover B to the place of guide holes A and B 3 Install belt cover A to the arm installing section 4 Adjust the position of belt cover B and fix it with wood screw WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning the power off and ascertaining that the motor is at rest WARNING To protect against possible perso...

Page 21: ...he bobbin case from the inside 4 Put the thread on bobbin threads slack preventer spring 1 Set a bobbin to the bobbin case so that the bob bin turns in the direction of arrow mark A 2 Pass the thread through thread slit in the hook and draw the thread and pull it so that it passes under the tension spring A WARNING To protect against possible personal injury due to abrupt start of the machine be s...

Page 22: ...30 2 When using filament thread for sewing use the felt thread guides supplied with the sewing ma chine If the needle thread loosens or breaks take some preventive measure such as winding the thread on the needle S type 3 To produce chain off thread the felt thread guide in Fig 2 or Fig 3 should be used for the S type or the needle thread presser in Fig 5 should be used for the G type 4 For the LH...

Page 23: ...at the motor is at rest G type LH 3578A 3578A 7 3588A and 3588A 7 K A B K L M N O P Left hand needle thread Right hand needle thread Intermediate thread guide H G C D E F 14 mm Fig 1 Fig 2 1 Thread guide M is able to prevent the needle thread from flapping according to its incli nation If the thread guide is inclined excessively the needle thread can tangle on thread guide N So carefully adjust th...

Page 24: ...d F type A B I H G E F C D J K L M N O P K 1 Be careful of threading of needle clamp thread guides O See Fig 1 for thin filament thread of yarn count 50 or higher and Fig 2 for thick filament thread of yarn count 50 or lower filament thread around yarn count 50 and polyester spun thread 2 Pass right side needle thread through the upper side of thread guide pin H 3 Pass the thread through the inter...

Page 25: ...n Turn tension adjusting screw clockwise to increase or counterclockwise to reduce the bobbin thread tension 4 13 Thread tension WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning the power off and ascertaining that the motor is at rest S type and G type A type and F type ...

Page 26: ... wound with thread loosen nut and adjust the height of bobbin winder tension disk It is the standard that the center of the bobbin is as high as the center of thread tension disk Adjust the position of thread tension disk to the direction of D when the winding amount of 4 14 Winding the bobbin thread the bobbin thread on the lower part of the bobbin is excessive and to the direction E when the win...

Page 27: ...n of the spring After the adjustment fix nut by tightening screw 1 For thread take up spring on the left side loosen screw and adjust the stroke of the spring by mov ing the screw along the slot for adjustment 2 For thread take up spring on the right side loosen screw and adjust the stroke of the spring by moving thread take up spring adjusting plate along thread take up spring base In addition fo...

Page 28: ...tension No 2 setscrew 2 Stroke of thread take up spring on the left is adjustable by moving thread tension No 2 asm to the left or right after loosening thread tension No 2 setscrew 3 Move thread tension No 2 asm and to the right to increase or to the left to decrease the stroke of the thread take up spring 1 When you want to change the stroke of the thread take up spring A type and F type To turn...

Page 29: ...e upper two of engraved marker lines are for DPx5 134 needle and the lower two of them are for DP X 17 135x17 needle Adjusting procedure for DPx5 134 needle Adjust top engraved marker line A of needle bar to the bottom end of needle bar rocking base and tighten the needle bar connecting stud clamping screw At this time the needle bar goes up by 2 2 mm from the lowest position adjust the second eng...

Page 30: ...ion can also be adjusted by removing screw from the spring shoe and turning spring shoe by a half revolu tion the extent of adjustment 0 3mm 0 01 to 0 05mm Determine the position of the hook 1 Loosen three setscrews in the screw gear small and turn the handwheel to lift the needle bar from its lowest position by 2 2 mm 2 In this state loosen four setscrews in hook driving shaft saddle and move hoo...

Page 31: ...nd adjust the length of connecting rod 4 19 Adjustment of the pedal WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning the power off and ascertaining that the motor is at rest WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning t...

Page 32: ... 1 Pedal Operation When auto lifter AK135 is used 1 step switch is increased between stop and thread trimming The presser foot goes up when the back part of the pedal is lightly depressed D and the presser foot comes down once when the back part of the pedal is further strongly depressed Then the thread trimmer is actuated and the presser foot goes up again If you reset the pedal to its neutral po...

Page 33: ...ssure Turn the regulator clockwise to increase the pres sure and turn it counterclockwise to decrease the pressure After the adjustment tighten nut 5 3 Adjusting the pressure of the presser foot Decrease Increase Loosen screw turn micro lifter pin and the height of the presser foot can be adjusted to 0 to 0 5 mm ...

Page 34: ...n unless thread tension release plate or hand lifter lever is actuated If you start sewing without releasing the thread tension a load will be applied to the needle when the material is drawn out resulting in needle bending or breakage 5 6 One touch manual reverse feed One touch reverse feed type How to use 1 Press switch and the sewing machine will immediately run in the reverse direction to perf...

Page 35: ...g aligns with the flat section of the hook driving shaft Make the state as the standard Fig b Then fix screw No 2 which is put in screw hole B in sprocket as well 6 1 Procedure of changing over between bottom feed and needle feed and the adjustment for LH 3528A only 6 MAINTENANCE WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following w...

Page 36: ...ews in the order of and At this time remove the setscrew which is put in screw hole C and put it in screw hole A which is located on the opposite side at 180 Fig b Turn the pulley by 180 without turning the hook driving shaft align the flat section of the hook driving shaft with screw hole A in sprocket and fix with setscrews It is the standard that screw No 1 in hook driving shaft rear bearing al...

Page 37: ... hook driving shaft to raise the feed dog from its lower position until it is flush with the top surface of the throat plate 4 Carefully keeping the needle and the feed dog in the aforementioned state put timing belt on the pulley 5 Adjust the timing of the right and left hooks and adjust the timing of the thread trimming cam referring to 4 17 Needle to hook relation p 27 and 6 3 Adjusting the thr...

Page 38: ...til it securely fits in there 2 Turn handwheel in the opposite direction of the rotating direction of the sewing machine until its smooth move is hindered At this time check to be sure that engraved marker dot on the arm is aligned with engraved marker dot red on the handwheel 2 Clearance between the thread trimming cam and thread tension release arm 1 Depress thread tension release arm 2 At this ...

Page 39: ... of hook is 0 01 to 0 05 mm Refer to 4 17 Needle to hook relation p 27 1 Turn the handwheel in the normal direction to bring inner hook guide to the extreme rear position 2 Turn bobbin case in the direction of the arrow and make inner hook stopper come in contact with the groove of throat plate 3 Loosen inner hook guide setscrew set the clearance between the inner hook guide and pro trusion A of t...

Page 40: ...cap on the side of machine bed loosen feed bar shaft setscrew and turn knurled section to adjust the inclination Standard inclination is the position where en graved marker dot A of feed bar arm aligns with engraved marker dot B of feed bar shaft En graved marker dot C is not used WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following ...

Page 41: ... link asm Sewing machine with thread trimmer 4 Loosen two setscrews of hook shaft saddle and move the hook shaft saddle At this time the hook driving shaft gears move as well 5 Set the clearance between the needle and the blade point of hook to 0 01 to 0 05 mm 6 Tighten two setscrews of the hook shaft saddle 7 Tighten from screws No 1 at the position where the clearance between hook driving shaft ...

Page 42: ...he lower dead point 2 Set clearance D between moving knife and protrusion of the inner hook to 0 3 0 1 mm Loosen moving knife setscrews and and adjust the clearance WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning the power off and ascertaining that the motor is at rest Left knife Right knife B D Reference valu...

Page 43: ...ard adjustment value of the counter knife position is obtained by adjusting eccentric pin to the position that is reached by turning eccentric pin in such a direction as to push moving knife downward by approximately 10 after counter knife comes in contact with moving knife If the counter knife pressure is too high The thread will be trimmed easily but the counter knife will wear off quickly Opera...

Page 44: ...dle and wiper is approximately 2 mm Be careful that screw A does not protrude in the rear of the bed slide when fixing the attachment to the bed slide with the screw Needle WARNING To protect against possible personal injury due to abrupt start of the machine be sure to start the following work after turning the power off and ascertaining that the motor is at rest 2mm A When it protrudes as shown ...

Page 45: ...work after stopping the sewing machine once When the operation of changeover is performed at 1 000 sti min or more break down will be caused When the sewing machine is used as the substitute for 1 needle sewing machine in the state of separately driven needle bar break down of the sewing machine will be caused When per forming sewing with 1 needle sewing machine remove one of two needles and use t...

Page 46: ...8 1 4 100 3 0 2 0 1 5 Number of stitches Turning angle 1 2 3 4 5 6 7 8 9 40 4 4 3 7 3 3 2 9 50 4 1 3 4 2 9 2 6 2 3 60 4 1 3 3 2 7 2 4 2 1 1 8 70 4 5 3 4 2 7 2 3 1 9 1 7 80 3 8 2 8 2 3 1 9 1 6 90 4 8 3 2 2 4 1 9 1 6 100 4 0 2 7 2 0 1 6 Number of stitches Turning angle 1 2 3 4 5 6 7 8 9 40 3 3 2 6 2 2 1 9 1 6 1 5 50 3 4 2 6 2 0 1 7 1 5 60 2 7 2 1 1 6 1 4 70 3 4 2 3 1 7 1 4 80 2 8 1 9 1 4 90 4 8 2 4 ...

Page 47: ... 9 5 7 2 2 6 4 0 8 5 8 2 2 6 4 0 7 5 9 2 2 6 4 0 5 5 1 2 2 6 4 0 3 5 3 4 0 0 3 5 8 9 7 2 4 m m 2 0 m m 2 2 6 4 0 4 5 2 2 2 6 4 1 0 5 4 2 2 6 4 1 3 5 1 2 2 6 4 2 0 5 2 2 2 6 4 2 1 5 1 2 2 8 1 6 5 5 7 2 2 8 1 6 7 5 5 2 2 8 1 6 9 5 3 2 2 8 1 7 0 5 0 4 0 0 3 3 9 4 7 4 0 0 3 3 9 5 3 4 0 0 3 3 9 4 1 P a r t N o P a r t N o 1 0 3 9 2 0 5 8 1 0 3 9 2 2 5 6 1 0 3 9 2 7 5 1 1 0 3 9 3 0 5 6 2 2 8 4 4 4 5 0 2...

Page 48: ... 1 7 9 9 5 1 1 1 1 2 7 1 5 9 1 9 1 2 2 2 2 5 4 2 8 6 3 1 8 3 4 9 3 8 1 A F m m 5 8 3 4 7 8 1 1 1 2 S o N t r a P o N t r a P o N t r a P P a r t N o 1 8 B 3 2 P a r t N o G P a r t N o P a r t N o 2 2 6 3 0 2 0 6 2 2 6 3 0 4 0 4 2 2 6 3 0 5 0 3 2 2 6 3 0 6 0 2 2 2 6 3 0 8 0 0 2 2 6 3 0 9 0 9 2 2 6 3 1 0 0 6 2 2 6 3 1 1 0 5 2 2 6 3 1 3 0 3 2 2 6 3 1 4 0 2 2 2 6 3 1 5 0 1 2 2 6 3 1 7 0 9 2 2 6 3 1 8...

Page 49: ...0 0 2 5 8 3 2 4 0 0 2 5 8 3 4 4 0 0 2 5 8 3 5 4 0 0 2 5 8 3 6 4 0 0 2 5 8 3 7 4 0 0 2 5 8 3 9 4 0 0 2 5 8 4 0 4 0 0 2 5 8 4 1 4 0 0 2 5 8 4 2 4 0 0 2 5 8 4 3 4 0 0 2 5 8 4 4 2 2 6 4 1 0 5 4 4 0 0 3 3 9 4 1 2 2 8 1 7 0 5 0 2 2 8 1 6 9 5 3 1 7 1 9 P a r t N o 4 0 0 6 1 2 7 0 4 0 0 6 1 2 7 1 4 0 0 6 1 2 7 2 4 0 0 6 1 2 7 3 4 0 0 6 1 2 7 4 4 0 0 6 1 2 7 5 4 0 0 6 1 2 7 6 4 0 0 6 1 2 7 7 4 0 0 6 1 2 7 ...

Page 50: ...0 2 6 1 0 3 P a r t N o P a r t N o B 1 4 0 2 5 2 8 B A 0 A B 1 4 0 2 5 2 8 C A 0 A B 1 4 0 2 5 2 8 D A L A B 1 4 0 2 5 2 8 E A L B 1 4 0 2 5 2 8 F A L A B 1 4 0 2 5 2 8 G A L B 1 4 0 2 5 2 8 H A L A B 1 4 0 2 5 2 8 K A L A B 1 4 0 2 5 2 8 L A L B 1 4 0 2 5 2 8 M A L B 1 4 0 2 5 2 8 N A L B 1 4 0 2 5 2 8 Q A L B 1 4 0 2 5 2 8 Q A R B 1 4 0 2 5 2 8 N A R B 1 4 0 2 5 2 8 M A R B 1 4 0 2 5 2 8 L A R ...

Page 51: ...A B 1 4 0 2 5 2 8 L A L B 1 4 0 2 5 2 8 M A L B 1 4 0 2 5 2 8 N A L B 1 4 0 2 5 2 8 N A R B 1 4 0 2 5 2 8 M A R B 1 4 0 2 5 2 8 L A R B 1 4 0 2 5 2 8 K A R A B 1 4 0 2 5 2 8 H A R A B 1 4 0 2 5 2 8 G A R B 1 4 0 2 5 2 8 F A R A B 1 4 0 2 5 2 8 E A R B 1 4 0 2 5 2 8 D A R A B 1 4 0 2 5 2 8 C A 0 A B 1 4 0 2 5 2 8 B A 0 A 4 0 0 2 5 2 3 9 4 0 0 2 5 2 4 9 4 0 0 5 1 6 3 3 4 0 0 4 5 7 3 0 4 0 0 4 5 7 2 ...

Page 52: ... 5 1 2 P 0 H B 1 6 1 3 5 1 2 Q 0 H B 1 6 1 3 5 1 2 S 0 H B 1 6 1 3 5 1 2 T 0 H B 1 6 1 3 5 1 2 U 0 H B 1 6 1 3 5 1 2 B 0 H B 1 6 1 3 5 1 2 C 0 H 2 4 m m 2 2 8 1 6 5 5 7 2 2 8 1 6 7 5 5 2 2 8 1 6 9 5 3 2 2 8 1 7 0 5 0 4 0 0 3 3 9 4 7 4 0 0 3 3 9 5 3 4 0 0 3 3 9 4 1 P a r t N o 2 2 8 1 7 1 5 9 4 0 0 3 5 8 9 6 4 0 0 7 1 9 0 9 2 2 8 1 6 6 5 6 2 2 8 1 6 8 5 4 4 0 0 3 3 9 4 5 4 0 0 3 3 9 4 9 4 0 0 3 3 9...

Page 53: ... 0 7 1 9 1 2 4 0 0 3 5 8 9 5 4 0 0 7 1 9 1 3 4 0 0 7 1 9 1 4 4 0 0 7 1 9 1 5 4 0 0 7 1 9 1 6 4 0 0 2 5 8 3 2 4 0 0 2 5 8 3 4 4 0 0 2 5 8 3 5 4 0 0 2 5 8 3 6 4 0 0 2 5 8 3 7 4 0 0 2 5 8 3 9 4 0 0 2 5 8 4 0 4 0 0 2 5 8 4 1 4 0 0 2 5 8 4 2 4 0 0 2 5 8 4 3 4 0 0 2 5 8 4 4 4 0 0 3 3 9 4 1 2 2 8 1 7 0 5 0 2 2 8 1 6 9 5 3 4 0 0 3 5 8 9 6 4 0 0 7 1 9 0 9 2 2 8 1 6 6 5 6 2 2 8 1 6 8 5 4 4 0 0 3 3 9 4 5 4 0...

Page 54: ...K A R A B 1 4 0 2 5 2 8 H A R A B 1 4 0 2 5 2 8 G A R B 1 4 0 2 5 2 8 F A R A B 1 4 0 2 5 2 8 E A R B 1 4 0 2 5 2 8 C A 0 A B 1 4 0 2 5 2 8 B A 0 A B 1 6 1 3 5 1 2 C 0 H 4 0 0 3 5 8 9 6 4 0 0 7 1 9 0 9 2 2 8 1 6 6 5 6 2 2 8 1 6 8 5 4 4 0 0 3 3 9 4 5 4 0 0 3 3 9 4 9 4 0 0 3 3 9 5 1 1 0 2 2 9 1 6 9 B 1 4 0 2 5 2 6 G A R A 1 0 2 2 8 5 6 7 B 1 4 0 2 5 2 6 D A R A B 1 4 0 2 5 2 6 C A 0 A 1 0 2 2 9 1 5 ...

Page 55: ... 5 3 7 0 5 4 0 0 7 1 9 1 1 4 0 0 7 1 9 1 2 4 0 0 7 1 9 1 3 4 0 0 7 1 9 1 4 4 0 0 2 5 8 4 1 4 0 0 2 5 8 4 2 1 0 2 2 9 1 6 9 B 1 4 0 2 5 2 6 G A R A 1 0 2 2 8 5 6 7 B 1 4 0 2 5 2 6 D A R A B 1 4 0 2 5 2 6 C A 0 A 1 0 2 2 9 1 5 1 1 0 2 2 8 9 5 5 1 0 2 2 8 8 5 6 B 1 4 0 2 5 2 6 K A R A B 1 4 0 2 5 2 6 F A R A B 1 4 0 2 5 2 6 L A L A B 1 4 0 2 5 2 6 K A L A B 1 4 0 2 5 2 6 B A 0 A B 1 4 0 2 5 2 6 H A L...

Page 56: ...sting the amount of oil in the hook p 9 Adjust the needle thread tension Reduce the tension of the spring and increase the stroke Refer to 4 17 Needle to hook relation p 27 Wind the thread on the needle Use the thread guide equipped with felt pad Use the optional needle clamp wire Wind the bobbin with thread by 80 of its capacity 2 Stitch skipping Clearance between the needle and the hook blade po...

Page 57: ...e The position of the moving knife is not correct Bobbin thread cannot be trimmed by dropping the thread trimmer Refer to 6 9 Adjusting the position of the moving knife p 40 Use the feed dog with thicker teeth 2 mm Retard the thread trimming cam timing by 5 5 Amount of idling is excessively large The counter knife pressure is inadequate Backlash between the bobbin and the bobbin case is excessivel...

Page 58: ... the list below The effective motor pulley diameter is obtained by subtracting 5 mm from the outer diameter The motor should rotate counterclockwise when viewed from the pulley side Be careful not to rotate it in the counter direction LH 3528A 3568A 3578A and 3588A Motor pulley Sewing speed sti min Belt Outer diameter mm Part No 50Hz 60Hz Length Part No 75 MTKP0070000 3000 43 inches MTJVM00430A 70...

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JUKI LH-3500A series, Instruction Manual

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