JUKI HZL-12Z User manual

Page 1/19

Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

HZL-12Z

Page 2/19

Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

TABLE OF CONTENTS

1. DISASSENBLING OUTER PARTS

2. FEED DOG HEIGHT

3. NEEDLE HEIGHT

4. HOOK OF NEEDLE THREADER

5. PRESSERFOOT HEIGT

6. NEEDLE POSITION, STRAIGHT STITCHING

7. NEEDLE SIDE MOTION

8. FEED DOG CLEARANCE TO NEEDLE PLATE

HOLE

9. NEEDLE TIMING TO SHUTTLE

10. NEEDLE CLEARANCE TO SHUTTLE

11. SHUTTLE SHAFT RATTLE

12. THREAD TENSION

13. ADJUSTING MOTOR BELT TENSION

14. ADJUSTING BUTTONHOLE PITCH BALANCE

*The parts in the pictures can be looked differently as what they are.

Page 3/19

Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

１．DISASSENBLING OUTER PARTS (1)

(1) Removing a face cover

Take out 2 screws and remove a face cover.

(2) Removing a front cover

1. Take out 2 screws on a bottom surface.

2. Take out 4 screws of a back face.

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Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

1. DISASSENBLING OUTER PARTS (2)

3. Take out 2 screws of a thread guide plate.

Loosen one of them and take off thread guide plate.

4. Take out 2 screws and take off a switch cover.

5. Remove front and back covers with a small screw driver.

Just loosen it.

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Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

1. DISASSENBLING OUTER PARTS (3)

6. Extract a length control dial

7. Take off a side-on connection putting a hand in a hole of length control dial.

Take off a connection of a needle bar.

8. Take off a front cover.(Including a shuttle cover)

Disconnect this connector, and you can

take off a front cover.

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Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

1. DISASSENBLING OUTER PARTS (4)

(3) Taking off a back cover.

1. Pull out a switch cover after taking out screws.

2. Pull out a back cover backwards and take it off.

*It is possible to do test sewing by attaching a thread guide plate(set).

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Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

2. FEED DOG HEIGHT

〔Checking〕

1. Set the stitch length control at “maximum”.

2. Turning a hand wheel by hand, bring up feed dogs totheir top position.

3. Check if feed dog height is 0.89 – 1.09 mm from upper surface of a needle plate.

〔Adjustment〕

1. Under checking condition, while pushing a feel lifting lever(1) against a pin(3) of a

shuttle adjust lever(2), correct feed dog height by loosening 2 screws(4) and

turning an adjusting nut(5).

Lift a screw driver down(Clockwise direction) →Feed dogs become high

Lift a screw driver up(Anticlockwise direction) →Feed dogs become low

0.89 - 1.09mm

Page 8/19

Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

3. NEEDLE HEIGHT

〔Checking〕

1. Set the zigzag width at “maximum”.

2. Turning a hand wheel by hand, bring a needle to its right hand and lowest position.

Then bring it to the center of a needle plate eyehole by turning the zigzag width

control dial.

3. Check if height of a needle tip is the same level as bottom surface of a gage.

* Bottom surface of a gage is 11.17mm from the centre of a shuttle.

* Top surface of a gage is 11.47mm from the centre of shuttle.

〔Adjustment〕

1. Remove a face cover.

2. Remove a thread guide plate(set).

3. Loosen a screw(2) of a needle bar clamp(1), and correct needle bar height by sliding

it up and / or down.After adjustment, tighten a screw(2) securely.(When tightening a

screw, a needle must be facing front.)

11.17 - 11.47mm

from center of a shuttle race

Needle position is center

and lowest

Page 9/19

Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

4. HOOK OF NEEDLE THREADER

〔Checking and adjustment〕

Adjust position of a hook by using one of accessories, a small screw driver when

a hook is not aligned.

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Original issue

Jun. 2012

Service Manual

HZL-12Z

Model

5. PRESSER FOOT HEIGT

〔Checking〕

1. Raise a presser foot lifter.

2. Lower feed dogs below the upper surface of a needle plate by turning a hand

wheel.

3. Check if clearance between a presser foot and a needle plate is approx. 5.5 mm.

〔Adjustment〕

1. Raise a presser foot lifter.

2. Loosen a screw(2) of a presser bar bracket(1), and correct presser bar(3)

height by sliding it up or down.

3. After adjustment, tighten a screw(2) securely, keeping a presser foot in parallel

with feed dog direction.

5.5mm

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