JUKI HZL-27Z Bedienungsanleitung
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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