JUKI HZL-25Z User manual

HZL-25Z
SERVICE MANUAL
®
SEWING MACHINE

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PAGE
1
1
[ 1 ] DISASSEMBLING OF OUTER PARTS
1. Base cover
1. Lower presser foot and lay machine.
2. Remove 3 screws (1) and take out base cover (2).
* Re-assembling should be done in the reverse way.
2. Gear cover
1. Remove screw (1) and take out gear cover (2).
* Re-assembling should be done in the reverse way.

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1
2
3. Face cover
Disassembling
1. Raise presser foot lifter (1).
2. Remove screw (2) and take out face cover (3).
Re-assembling
1. Raise presser foot lifter (1).
2. Insert presser foot lifter (1) into small window (4) of face cover (3).
3. Insert jut (6) of face cover (3) into hole (5) of arm.
4. Fixscrew(2)ttingfacecoverproletoarmprole.

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1
3
4. SIDE COVER
Disassembling
1. Remove screw (1), (9).
2. Pushcover(2)asindicatedbyarrowinsertingyourngerintothebobbin
winder hole (3) and take out cover (2).
〔Cover(2)hasttinghook(4).〕
3. When it cannot be removed by the above way, take out base cover (5) and
remove cover (2) from lower part.
Re-assembling
1. Insert hook (6) of cover (2) into small window (7) of base cover (5).
2. Sethook(4)ofcover(2)intotheinsideoffrontcover(8)andxbyscrew(1),(9).

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4
5. FRONT COVER
Disassembling
1. Remove side cover and face cover.
〔See page 2 and 3. 〕
2. Remove screws (1), (2), (3) and then securing plate (4).
3. Take out face cover (8) removing hook (7) from small window (6) of base
cover (5).
Re-assembling
1. Insert hook (7) of front cover (8) into small window (6) of base cover (5).
2. Fixscrews(1),(2)and(3)puttingfrontcover(8)uponarmprole.Alsox
securing plate (4).

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1
5
6. SHUTTLE COVER
Disassembling
1. Remove screw (1) and take out securing plate (2).
2. Remove shuttle cover (3) extracting as indicated by arrow.
* Re-assembling should be done in the reverse way.

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6
7. Hand wheel
Re-assembling
1. Set washer (a) and washer (b) in position as illustrated and fix them by
tightening stud screw (c) by hand.
2. Set clutch wheel (d) in position so that its projected portion may be posi-
tioned as illustrated.
3. Fix clutch wheel (d) with screw and tighten it clockwise.
** Disassembling should be done in reverse way.

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2 - 0
1
[ 2 ] ADJUSTMENTS
* Adjustment can be made with or without removal of outer parts.
Adjustment
Without
removing
outer
parts
Removing outer parts
Front
cover
Face
cover
Side
cover
Gear
cover
Base
cover
2 - 1 L-R positioner ○
2 - 2 Needle position
Straight and Zigzag max ○
2 - 3 Needle side motion ○
2 - 4 Clearance cam and cam follower ○
2 - 5 Feed dog height ○
2 - 6 Feed dog longitudinal positioning ○
2 - 7 Feed dog lateral positioning ○
2 - 8 Feed dog timing
Vertical Movement ○
2 - 8 Feed dog timing
Lateral Movement ○
2 - 9 "0"-Feeding needle position ○
2 - 10 Buttonhole sewing -"0" feeding ○
2 - 11 Balance of reverse stitch length ○
2 - 12 Balance of stitch length - stretch stitch ○
2 - 13 Presser foot height ○
2 - 14 Needle height ○
2 - 15 Needle clearance to Shuttle ○ ○
2 - 16 Needle timing to Shuttle ○
2 - 17 Control panel pointer positioning ○
2 - 18 Belt tension ○
2 - 19 Hooking Fork Position of
Needle Threader ○
2 - 20 Bobbin winder ○
2 - 21 Rubber foot height ○

SECTION
PAGE
2 - 1
1
2 - 1 L - R positioner
Checking:
1. Move the needle to the left end by hand.
2. Check if the needle touches the left end of needle hole of needle plate.
Adjustment:
1. Lay the machine.
2. Loosen screw (1) and move L - R positioner (2) to left or right for adjust-
ment.
3. Tighten screw (1).
NOTE: * Needle will be broken if needle is outside of left end of needle hole.
* Selector dial can not be turned smoothly if there is clearance of
more than 0.3 mm between left end of needle hole and needle.

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2 - 2
1
2 - 2 Needle position - Straight stitching and Zigzag stitching,
maximum width
Checking:
1. Remove presser foot.
2. Set machine at "straight stitching A" by turning selector dial.
3. Turning hand wheel by hand, lower the needle and check if needle point
comes to the center of needle plate hole.
4. Set machine at "zigzag stitching C (maximum width)" by turning selector dial.
5. Turning hand wheel by hand, move needle to right and left end, and check if
each clearance between needle and needle hole end of needle plate is equal.
Adjustment:
1. Remove face cover.
2. Loosen screw (1).
3. Turning eccentric pin (2), adjust needle position.
4. Tighten screw (1) after adjustment.
Straight stitching A Zigzag stitching C
(maximum width)