JUKI HZL-35Z User manual

SEWING MACHINE
HZL-35Z
SERVICE MANUAL
®

SECTION
PAGE
1
1
(1)
(3)
(4)
(2)
(5)
(6)
[ 1 ] DISASSEMBLING OF OUTER PARTS
1. Face cover
Disassembling
1. Remove screw (1) and take out face cover (2).
Re-assembling
1. Insert juts (5), (6) of face cover (2) into holes (3), (4) of arm.
2. Fix screw (1) fitting face cover profile to arm profile.

SECTION
PAGE
1
2
(1)
(2)
2. Spool Pin Stand
Disassembling
1. Remove screw (1) and take out spool pin stand (2).
* Re-assembling should be done in the reverse way.

SECTION
PAGE
1
3
(1)
(2)
3. Terminal Cover
Disassembling
1. Remove each screw (1) and take out terminal cover (2).
* Note that cord is connected inside of the cover.
* Re-assembling should be done in the reverse way.
* While re-assembling, any cord and timing belt should not be connected each
other.

SECTION
PAGE
1
4
(1)
(2)
4. Base Cover
1. Lay machine on its back.
2. Remove 4 screws (1) and take out base cover (2).
* Re-assembling should be done in the reverse way.

SECTION
PAGE
1
5
(3)(2) (1)
5. Bottom Cover
1. Lay machine on its back.
2. Remove screw (1) and take out base cover (2).
* Re-assembling should be done in the reverse way.
Feed dog control (3) should be set at up position ( ) before
re-assembling.

SECTION
PAGE
1
6
(1)
(6)
(2)
A
B(6)
6. Bed Cover
* Re-assembling should be done in the reverse way.
1. Remove presser foot and needle plate.
2. Turn hand wheel toward you until needle comes to its highest point.
3. Lay machine on its back.
4. Remove bottom cover from free arm. (See page 5)
5. Remove 2 screws (1) and 2 washers (2).
6. After lifting up bed cover (6) toward direction A, take it out toward direction B.
NOTE: Lift presser foot lever to its highest position for easy removal.

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PAGE
1
7
(7)
(8)
(9)
(5)
(1)
(6)
7. Front Cover
1. Remove face cover and base cover (see page 1 and 5).
2. Remove stitch length dial (1).
3. Loosen screws (5 and 6) and remove screws (7 and 8).
4. Remove front cover (9) from face cover side, as stitch length dial shaft is
sticking out.

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PAGE
1
8
(1)
(5)
(1)
(2)
(3)
(4)
8. Back Cover
* Re-assembling should be done in the reverse way.
1. Remove face cover, spool pin stand and base cover. (See page 1, 2, 5)
2. Remove 7 plus screws (1) and minus screws (2).
3. Remove screw (3) and turn presser foot lever (4) toward face cover.
4. Remove back cover (5).

SECTION
PAGE
Adjustment
Without
removal
of parts
With removal of outer parts
Front
cover
Back
cover
Face
cover
Spool
pin
stand
SV
cover
Needle
plate
Bottom
cover
Base
cover
Te r m i n a l
cover
2 - 1 L-Positioner {
2 - 2 Needle Position at Straight
Stitchi ng {
2 - 3 Needle Position at Zigzag
Stitchi ng {
2 - 4 Maximum Zigzag Width {
2 - 5 Needle Side Motion {
2 - 6 Clearance between Zigzag
Cam and Cam Follower {
2 - 7 Feed Dog Height {
2 - 8 Space Between Feed dog
and Hole of Needle Plate {{
2 - 9 Feed Dog Timing Vertical
Movement {
2 - 9 Feed Dog Timing Lateral
Movement {
2 - 10
2 - 11
2 - 12 Buttonhole Sewing - '0'
Feeding (B) {
2 - 13 Balance of Stitch Length-
Stretch Stitching {
2 - 14 Presser Fot Height {
2 - 15 Needle Height {
2 - 16 Needle Clearance to Shuttle {{
2 - 17 Needle Timing to Shuttle {{
2 - 18 Adjustment of Stitch Selector {
2 - 19 Belt Tension {
2 - 20 Hooking Fork Position of
Needle Threader {
2 - 21 Bobbin Winder {
2 - 22 Buttonhole Changer {
2 - 23 Rubber Foot Height {
2 - 0
1
[ 2 ] ADJUSTMENTS
* Adjustment can be made with or without removal of outer parts.

SECTION
PAGE
(2) (1)
2 - 1
1
2 - 1 L - 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:
NOTE: Unplug the machine from electrical outlet before adjustment.
1. Remove face cover.
2. Loosen screw (1) and shift needle bar limiter (2) in either direction for
adjustment.
NOTE: * Needle will be broken if needle is outside of left end of needle hole.
NOTE: * Selector dial can not be turned smoothly if there is clearance over
0.3mm between left end of needle hole and needle.

SECTION
PAGE
a a
(1) (2)
2 - 2
1
2 - 2 Needle Position at Straight Stitching
Checking:
1. Remove presser foot.
2. Set machine for straight stitching at center needle position.
3. Turning hand wheel by hand, lower the needle and check if needle point
comes to the center of needle plate hole.
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

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PAGE
ab
a<b
ab
a b
ab
a>b
(1)
2 - 3
1
2 - 3 Needle Position at Zigzag Stitching
NOTE: This adjustment is only for model with stitch width control.
Before checking, follow 2 - 2 "Needle position at straight stitching".
Checking:
1. Remove presser foot.
2. Set stitch width control at the maximum position and stitch selector at zigzag
stitch.
3. Turn hand wheel by hand and see if needle leaves the same clearance at
both right and left end of needle plate hole.
Fig. 1 Fig. 1 Fig. 1
Adjustment:
1. Remove back cover.
2. Turn screw (1) in either direction to correct the condition.

SECTION
PAGE
a
A
(1)
2 - 4
1
2 - 4 Maximum Zigzag Width
NOTE: This adjustment is only for model with stitch width control.
Follow 2 - 2 "Needle position at straight stitching" and 2 - 3 "Needle
position at zigzag stitching" before checking.
Checking:
1. Set width control lever at the maximum and stitch selector at "zigzag".
2. Check to see if zigzag width "a" is more than 6mm.
Adjustment:
1. Set width control lever at the maximum.
2. Insert screw driver through hole A, and turn screw (1) in either direction to
correct the condition.
3. If screw (1) is turned anti-clockwise, set width control lever at the maximum
and stitch selector at "zigzag" and recheck to see if width is correct.
Note: Recheck needle timing to shuttle (2-17) and needle clearance to shuttle (2-16).

SECTION
PAGE
A
Gear
(2)
B
(1)
2 - 5
1
2 - 5 Needle Side Motion
Checking:
1. Set stitch width control at maximum.
2. Bring needle to right-hand lowest position. Slowly lift up needle and observe
its leftward movement when leaving upper surface of needle plate.
3. Needle should move to left in the range of less then 0.3 mm when needle
point goes through needle plate.
4. Following ( ²) marked illustrations indicate wrong situation.
Too late Too early
Adjustment:
1. Remove spool pin stand.
2. Insert screw driver from back side. Loosen one of 2 screws (2) on worm
gear (1). Another one should be tightened temporarily.
3. Holding worm gear (1), turn hand wheel and adjust the angle of worm gear
against gear.
4. Tighten 2 screws (2) securely after adjustment.

SECTION
PAGE
0.35
(1)Terminal cover
(2)
(3)
2 - 6
1
2 - 6 Clearance between Zigzag Cam and Cam Follower
Checking:
1. Remove presser foot.
2. Set machine at maximum zigzag width.
3. Lower needle to its left lowest position.
4. Turn selector dial towards you (anti-clockwise) and set it between "zigzag
stitching" and "blind stitching".
5. Check if needle point shifts a little from above "3" position to left.
Adjustment:
1.
2. Adjust by turning screw (3).
Needle shift is zero or too little. ÆTurn screw clockwise.
Needle shift is too much. ÆTurn it anti-clockwise.
Remove two screws on terminal cover.
shift amount

SECTION
PAGE
(1)(1)
(1)(1)
(1)
Remove needle place if position of screw (1) is not clear.
(A)
2 - 7
1
2 - 7 Feed Dog Height
Checking:
1. Set stitch length control at maximum.
2. Remove needle and presser foot.
3. Set feed dog at highest position by turning hand wheel by hand.
4. Check to see if feed dog height (A) is 0.89 - 1.09 mm above needle plate.
Adjustment:
1. Set stitch length control at "0".
2. Turn hand wheel by hand until feed dog comes to its highest point.
3. Insert wrench through hole on bed cover and turn screw(1) in either direction
to adjust feed dog height.
Feed dog is too low. ÆTurn screw clockwise.
Feed dog is too high. ÆTurn it anti-clockwise.
4. When you turn it anti-clockwise, confirm the height after pushing needle plate.

SECTION
PAGE
2 - 8
1
2 - 8 Space Between Feed dog and Hole of Needle Plate
Checking:
1. Set stitch length control at maximum.
2. Confirm feed dog does not touch with to needle plate.
3. Confirm feed dog is parallel to needle plate hole.
4. Check to see if clearance (a) is about 1.0 mm, when feed dog shifts to the
front end by turning hand wheel.
Adjustment:
1. Remove face cover and needle plate.
2. Loosen screw (1) of feed dog and adjust the position.
3. Tighten screw (1) firmly after adjustment.
aa
aa
a
(1)(1)
(1)(1)
(1)

SECTION
PAGE
needle plate surface
2 mm
(2)
(1)
(3)
2 - 9
1
2 - 9 Feed Dog Timing
1) Vertical Movement
NOTE : Before checking, follow Section 2 - 7 “Feed Dog Height”.
Checking:
1. Set stitch length at "maximum".
2. Lower needle by turning hand wheel.
3. Check to see if needle point is 2 mm below needle plate when feed dog is on
a same level of needle plate.
NOTE: Be sure to check "Lateral movement" in the next page and "Needle timing
to shuttle (section 2 - 17)" after adjustment.
Adjustment:
1. Remove base cover.
2. Loosen screws (2) on timing pulley (1).
3. Keeping lower shaft (3) at the same position, adjust feed dog timing by turn-
ing timing pulley (1).
4. Tighten screws (2) firmly after adjustment.

SECTION
PAGE
(A)(A)
(A)(A)
(A)
(B)(B)
(B)(B)
(B)
(2)
(1)
2 - 9
2
2) Lateral Movement
NOTE : Before checking, follow Feed dog Timing (vertical movement).
Checking:
1. Set stitch length at maximum.
2. Turn hand wheel until feed dog is about to start to move (when cam (1) starts
to activate feed regulating arm).
3. Turning hand wheel, bring up needle bar to its highest dead point (A).
Check if total lateral movement (B) of feed dog during the period from Step 2
to Step 3 above is within the range of 0.3 - 0.6 mm.
Adjustment:
1. Remove base cover.
2. Loosen screws (2) on timing pulley (1).
3. Holding hand wheel, turn feed rocking cam (1) and adjust the angle of the cam to
lower shaft.
4. Tighten set screw (2) securely after adjustment.
Step 2 Step 3