JUKI HZL-27Z Manual de usuario

Page 1/24

Original issue

May 2009

Service Manual

HZL-27Z

Model

MODEL: HZL-27Z

JUKI HOUSEHOLD SEWING MACHINE CORPORATION

Page 2/24

Original issue

May 2009

Service Manual

HZL-27Z

Model

Contents

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

Page 3/24

Original issue

May 2009

Service Manual

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 4/24

Original issue

May 2009

Service Manual

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 5/24

Original issue

May 2009

Service Manual

HZL-27Z

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 6/24

Original issue

May 2009

Service Manual

HZL-27Z

Model

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 7/24

Original issue

May 2009

Service Manual

HZL-27Z

Model

2. Feed dog height

〔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.

〔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 8/24

Original issue

May 2009

Service Manual

HZL-27Z

Model

3. Needle height

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.

〔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 the needle plate.

Needle is at center,

highest position.

Ａ

Page 9/24

Original issue

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 10/24

Original issue

May 2009

Service Manual

HZL-27Z

Model

5. Presser foot height

〔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.

〔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

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