Juki NA-11UT Series Sewing Machine User manual

NA-11UT Series

Service manual

CONTENTS

1. JAM･CLEARANCE .................................................................................... 8

1-1. Needle Bar Jam ...................................................................................................... 8

1-2. Thread Take-up Lever Clearance ........................................................................ 10

2. FEED TIME .............................................................................................. 12

2-1. Adjusting the Height of the Feed Dog ................................................................ 12

2-2. The Up/Down Motion Adjusting Shaft Setting ................................................... 14

2-3. The Presser Foot Setting ..................................................................................... 16

2-4. The Feed Cam and Presser Foot Up/Down Motion Cam Setting ..................... 19

2-5. Adjusting the Motion Range of the Feed Dog .................................................... 20

2-6. Adjusting the Balance of the Feed Dog .............................................................. 22

3. THREAD TRIMMING TIME ...................................................................... 23

3-1. The Thread Bar Highest/Lowest Stop Position Setting .................................... 23

3-2. Replacement of the Mes and the Setting ........................................................... 25

3-3. The Thread Retainer Setting ................................................................................ 29

3-4. The Thread Trimming Cam Setting ..................................................................... 30

4. BAD SEWING .......................................................................................... 31

4-1. Hook Time ............................................................................................................. 31

4-2. Placing the Upper Thread .................................................................................... 34

4-3. Adjusting the Tension of the Upper Thread ....................................................... 35

4-4. Adjusting the Tension of the Presser Foot ........................................................ 36

4-5. Adjusting the Tension of the Lower Thread ....................................................... 37

5. NOISE ...................................................................................................... 38

5-1. Upper Shaft Collar Clearance .............................................................................. 38

5-2. Standing Shaft Clearance .................................................................................... 40

5-3. Lower Shaft Clearance ........................................................................................ 42

6. OIL SUPPLY ............................................................................................. 43

6-1. Oil Supply .............................................................................................................. 43

6-2. Adjusting the Oil Supply Volume for the Thread Take-up ................................ 45

6-3. Adjusting the Oil Supply to the Hook ................................................................. 46

7. SOLENOID ............................................................................................... 47

7-1. Thread Trimming Solenoid .................................................................................. 47

8. ADJUSTING THE FORWARD/BACKWARD STITCH LENGTH ............. 49

8-1. Adjusting the Delicate Adjusting Shaft .............................................................. 49

8

01

JAMCLEARANCE

󰓉



Loosen the screwfor the face plate and disassemble the fact

plate from the arm.



󰑅󰄸󰘢󰑅

󰝝

[Fig. 1]





Loosen the fixing screwfor the needle and disassemble the

needle from the needle bar.



󰝝

[Fig. 2]





Disassemble the needle bar thread guidefrom the needle bar.



󰆸󰏏󰏏

󰝝

[Fig. 3]

Needle Bar Jam

󰏏󰓉

ᶮᔰᵪ䪸പᇊ㷪эĸਾˈ࠶⿫䪸ᵶкⲴ䪸

9

01



JamClearance

󰓉

Maintenance Book



Loosen the fixing screwfor the needle bar. Move the needle bar

up and down to check the jam.



󰏏󰄸󰓁󰀛󰏏󰗈󰀺

󰝝

[Fig. 4]





If the needle bar is stuck, remove the rubber cap of the needle

bar upper bushing.



󰏏

󰔒󰅺󰏏󰐫

󰝝

[Fig. 5]



Disassemble the needle barin the direction of the upper bushing

and replace it with a new SunStar needle bar.



󰐫󰔠󰏏󰘢󰗑󰅇󰒧󰏏

󰝝



Make the assembly in the reverse order of the disassembly.



󰉣󰔞󰆞󰂦

󰝝

[Fig. 6]

10



Loosen the screwfor the face plate and disassemble the face

plate.



󰑅󰄸󰑅

󰝝

[Fig. 1]





Remove the rubber cap from the arm hole. Insert the driver to

loosen the screwfor the thread take-up lever hinge pin by

turning it full circle.



󰃤 󰁎󰘢 󰀽󰄸



󰝝



Be cautious not to turn the cutting part of the screw for

the thread take-up lever hinge pin.



󰇞󰄸󰄔

󰝝

[Fig. 2]





Smoothly press the tread take-up lever hinge pinin the direction

of the arm bed and tighten the screwfor the hinge pin.



󰔠 󰘢

󰄸



󰝝

[Fig. 3]



Thread Take-up Lever Clearance





Slightly move the thread take-upleft and right to check the

clearance.



󰇉󰗨󰗈󰀺

󰝝

[Fig. 4]

01



JamClearance

󰓉

11

Maintenance Book



Manually turn the pulleyto check whether there is no jam and it

operates smoothly.



󰄔󰘢󰗈󰀺󰓉󰔞

󰝝



Make the assembly in the reverse order of the disassembly.



󰉣󰔞󰆞󰂦

󰝝

[Fig. 5]

12

02FEED TIME

󰃶



Turn the dial in the direction of the arrow and set it at the

maximum stitch length.



󰄏󰔠󰄔󰒢󰆤󰍡󰏏

󰝝



Max. stitch length:



󰍡󰏏 

[Fig. 1]



Lay down the machine and loosen the screwfor the feed lift

shaft crank (ass’y).



󰘐󰘢󰅯󰃹󰄸

󰝝

[Fig. 2]





Set the heightof the feed at standard 1.2mm when the needle

bar is at the highest point.



󰆤󰅀󰂭󰏏󰍡󰄩󰃤󰒀󰒞󰇹



󰝝

[Fig. 3]

Adjusting the Height of the Feed Dog

󰒀󰆤󰅀



13

02



Feed Time

󰃶

Maintenance Book



Tightly tighten the screwfor the feed lift shaft crank (assy).



󰅯󰃹󰄸

󰝝

[Fig. 4]



14



[Fig. 1]





[Fig. 2]





[Fig. 3]



[Fig. 4]



The Up/Down Motion Adjusting Shaft Setting



󰓁󰆤󰅀󰎃󰂦

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$GMXVWWKH&$0WRPPIURPWKHQHHGOHSODWH

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᣶䲔ₑ㜦ຎǄ

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02



Feed Time

󰃶

15

Maintenance Book



[Fig. 5]



ᆹ㻵ᰦˈ享ሶ$㷪䪹ս㖞䈳ᮤ൘ᴰվս㖞Ǆ

7KHSRVLWLRQRIVFUHZDVKDOOEHDGMXVWHGWR

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16

The Presser Foot Setting

󰂦



Turn the presser foot lifter in the direction of the arrow to lift

the presser foot.



󰄏󰔠󰄔󰅯󰅯

󰝝

[Fig. 1]



Loosen the screw for the main presser foot and disassemble the

presser foot .



󰇍󰄸

󰝝

[Fig. 2]





Loosen the screw for the presser bar holder. Set the heightof

the auxiliary presser footat mm, and tightly tighten the screw

for the presser bar holder.



󰔒󰐶󰄸󰆤󰅀󰆂

󰘢 󰐶󰄸

󰝝

[Fig. 3]



Insert the main presser foot and tighten the screwfor presser

foot.



󰁎󰇍󰘢󰄸

󰝝

[Fig. 4]





02



Feed Time

󰃶

17

Maintenance Book



Turn the pulley to set the needle barat the highest point.



󰅇󰄔󰏏󰍡󰄩

󰝝

[Fig. 5]



Loosen the screw for the auxiliary presser foot up/down motion

crank.



󰔒󰆂󰓁󰄸

󰝝

[Fig. 6]





Adjust the heightof the auxiliary presser foot to be 3mm from

the upside face of the needle plate.



󰆤󰅀󰆂󰃅󰖹󰏏󰑅

󰝝

[Fig. 7]



Adjust the height of the auxiliary presser foot at 3mm, and tighten

the up/down crank screw.



󰐶󰆂󰆤󰘢󰓁

󰝝

[Fig. 8]



18

02



Feed Time

󰃶

19

Maintenance Book



Disassemble the top cover.





󰝝

[Fig. 1]



󰝝

[Fig. 2]

[Fig. 3]





The Feed Cam and Presser Foot Up/Down Motion Cam Setting



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ᵪ䪸ᆄѝᗳᓄо䪸ᶯк㺘䶒䘱ᐳ⢉ࡽㄟ喯൘਼а≤ᒣк

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

[Fig. 4]

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

Lift the presser foot by turning the presser bar lifter .



󰄔󰅯󰅯

󰝝

[Fig. 1]



Adjusting the Motion Range of the Feed Dog



󰒀󰆤󰅀

20



Turn the dialin the direction of the arrow and set the stitch

length at the maximum level ( mm).



󰄏󰔠󰄔󰒢󰆤󰍡󰏏

󰝝

[Fig. 2]



Loosen the screw for the feed dog support base by turning it

full circle.



󰒀󰈨󰐘󰄸

󰝝

[Fig. 3]





Manually turn the pulley. When the needle descends and the

center of the thread hole of the needle meets the face of the needle

plate, set the distancebetween the back of the feed and the feed

dog groove at 2mm.



󰄔󰏏󰃁󰏏󰑅󰀛󰏏󰈋󰘢󰆤󰅀

󰒀󰘢󰖹󰒀󰆏

󰝝

[Fig. 4]

󰝝

󰝝󰝝

󰝝

02



Feed Time

󰃶

21

Maintenance Book



Tighten the screw for the feed dog support crank.



󰒀󰈨󰐘󰄸

󰝝

[Fig. 5]





Loosen the fixing screwfor the feed dog support shaft.



󰒀󰈨󰐘󰎃󰄸

󰝝

[Fig. 1]



22



When the feed dog is at the highest position, turn the feed dog

turning shaftto make the upside face of the feed dog horizontal

with the needle plate.



󰄔󰒀󰍡󰄩󰒀󰈨󰐘󰎃 󰒀󰏏󰑅󰖹

󰏏󰑅󰈥󰑫

󰝝

[Fig. 2]





Adjust the upper faceof the needle plate and the upper face

of the feed dog to be horizontal.



󰆤󰅀󰏏󰑅󰖹󰒀󰈟󰈥󰑫

󰝝

[Fig. 3]



Tighten the fixing screw for the feed dog support shaft.



󰒀󰈨󰐘󰎃󰄸

󰝝

[Fig. 4]



Adjusting the Balance of the Feed Dog

󰒀󰑫󰆤󰅀

23

Maintenance Book

03THREAD TRIMMING TIME

󰄝



Press the switchand check the highest/lowest stop position.



󰗈󰀺󰏏󰓁󰄴󰈭󰎺

󰝝



Highest stop position: Press the switch once.



Lowest stop position: Press the switch twice in a row.



󰄴󰈭󰖛

󰝝



󰓁󰄴󰈭󰊉

󰝝

[Fig. 1]

󰝝



When it is moved in the direction of 󲼦, the stop timing is advanced.

When it is moved in the 󲼧direction, the stop timing is delayed.



󲼦󰔠󰀛󰄴󰈭󰘁󰏔󲼧󰔠󰀛󰄴󰈭

󰘁

󰝝

[Fig. ]





The Thread Bar Highest/Lowest Stop Position Setting



󰏏󰓁󰄴󰈭󰎺󰂦

$

%



0DNHVXUHWKHVWRSSLQLVHQDEOHG



󰗈󰀺



󰝝

[Fig. ]





The highest stop position of the needle bar should be 1mm

below than the highest pointof the thread take-up lever.



󰏏󰄴󰈭󰎺󰄴󰂭󰍡󰄩󰎺

󰝝

[Fig. ]



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Juki NA-11UT Series Sewing Machine User manual

Juki NA-11UT Series Sewing Machine User manual

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