Table of Contents
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Table of Contents
Related Manuals for JUKI HZL-350Z series
Summary of Contents for JUKI HZL-350Z series
- Page 1 SEWING MACHINE HZL-350Z series SERVICE MANUAL...
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Page 2: Table Of Contents
CONTENTS 1. Products specification ......................2 2. Out look .............................3 3. Names of principal parts ......................4 4. Removing methods of external parts Sewing table ........................5 Face plate .........................5 Cord reel cover .........................5 Belt cover ..........................5 Free arm foot bush ......................6 Free arm cover .........................6 Front cover ........................6-7 Back cover ........................8... -
Page 3: Products Specification
1. Products specification TYPE 353Z 355Z 357Z ITEM Machine style Free arm Size of machine (L x W x H) 177 x 410 x 308 mm Weight (kg) 7.1 (Only machine) Max rotation speed (rpm) Motor power Motor type Series wound / AC Rotation control method Electric type Needle position... -
Page 4: Out Look
2. Out look... -
Page 5: Names Of Principal Parts
3. Names of principal parts 1. Tension dial 15.Reverse lever 2. Presser foot pressure 16.Handwheel 3. Thread take up lever 17.Patten selector dial 4. Thread cutter 18.Buttonhole balance control dial 5. One step buttonhole lever 19.Main switch 6. Automatic threader 20.Main plug socket 7. -
Page 6: Removing Methods Of External Parts
4. Removing methods of external parts 4-1 Sewing table Remove the sewing table. (1) 4-2 Face plate Remove screw (a) and remove the face plate.(2) 4-3 Cord reel cover - Lay down machine. Remove 1 cushion rubbers (b). - Remove 4 screws (c, d, e, f). (3) - Remove cord reel cover. -
Page 7: Free Arm Foot Bush
4-5 Free arm foot bush Remove 4 screws (h, i, j, k) and remove the free arm foot bush. (5) Free arm foot bush 4-6 Free arm cover Remove 2 screws (l, m) and remove the free arm cover. (6) Free arm cover 4-7 Front cover - Remove face plate, arm top cover, sewing... -
Page 8: Front Cover
- Loosen screw (q) about 3mm. (9) Note 1: First using electric torch (flash light) etc to locate screw (q) position which deeply inside the machine. Note 2: To reach the screw (q), use Philips type Operation hole screwdriver through the operation hole on plate. -
Page 9: Back Cover
4-8 Back cover - Remove 2 screws (s, t). (13) Back cover - Loosen screw (u) about 3mm. (14) - Remove screw (v). - Loosen screw (w) about 3mm. - Remove the back cover. (15) -
Page 10: Adjusting Methods Of Each Part
5. Adjusting methods of each part 5-1 Symbol instructions Noise occur while the machine is running. Skip-over stitching, needle breakage, and problems associated with needle. Delivery of cloth to be in disorder and insufficient, problems associated with delivery amount. Stitch tightening problem. BH right and left stitching is not even, incorrect length and problems associated with buttonhole sewing. -
Page 11: Play Of Arm Shaft
5-2 Play of arm shaft Remove the face plate and arm top cover. Remove the 2 screws (a, b) of arm shaft collar (A). ---(1) Pull hand wheel backward. Push arm shaft collar (A) to left tightly against arm shaft bushing (B), and then fasten and secure screws (a, b). -
Page 12: Height Of Presser Foot
5-4 Height of presser foot Remove face plate and lift up presser bar lifter lever (A). ---(1) Place gauge (B) (6.0~6.2mm) on top of needle plate. ---(2) Loosen screw (a) of presser bar bracket. ---(3) Pull down presser bar lifter lever so bottom of presser foot and top surface of gauge would meet. -
Page 13: Needle Flow At Maximum Zigzag Width
5-5 Needle flow at maximum zigzag width - Choose patterns , zigzag 7 mm. Remove arm top cover. Set needle bar at its lowest point when it swings to left. Turn hand wheel to move the needle bar upward. The vertical distance in which the needle point goes up at the left position from the top of the needle plate should be 3~5mm. -
Page 14: Drop Middle Point Of Needle
5-6 Drop middle point of needle - Choose patterns , zigzag 0 mm. Remove face plate. Loosen screw (a) of needle bar driving rod pin (b). ---(1) Adjust needle by pushing (b) clockwise / counter-clockwise. Make sure needle drops on middle of needle hole. -
Page 15: Needle Position Of Zigzag
5-7 Needle position of zigzag - Choose patterns , zigzag 7 mm. Remove face plate Loosen screw (a) of needle bar driving rod pin. ---(1) Adjust needle by turning (b) clockwise / counter-clockwise. Clockwise left Counter-clockwise right Make sure needle drops on left / right of needle hole with even distance to the edge of needle hole, and then fasten the screws (a). -
Page 16: Automatic Needle Threader Adjustment
5-8 Automatic needle threader adjustment Check the threader hook. If it is damaged, change new one. If it is inclined, adjust the threader hook properly. Needle If the threader hook can not enter needle hole freely, please adjust the 0.1mm Threader threader stopper. -
Page 17: Adjustment Of Feed Rock Shaft And Feed Lifting Rock Cam
5-9 Adjustment of feed rock shaft and feed lifting rock cam Remove cord reel cover, free arm base and free arm foot bush. Turn the hand wheel to make the needle 0.5-1mm rise to its highest point. From this position on the feed should still shift another 0.5-1mm before stop. -
Page 18: Height Of Needle Bar
5-10 Height of needle bar - Choose patterns Remove face plate and needle plate. Remove the screws of rotary hook plate (A, B) and rotary hook plate, and take out the shuttle hook. Put the gauge of height of needle 25.0~25.1 mm (D) into the shuttle hook holder, and turn the hand wheel to set the needle at the lowest point. -
Page 19: Timing Of Needle And Hook
5-11 Timing of needle and hook -Choose patterns , zigzag 7 mm. Remove face plate, needle plate, shuttle hook, front cover. Take out screw (a, b, c), and take apart arm top cover thread guide plate(A). Set the needle bar at its lowest point while sewing to the left. -
Page 20: Distance-Needle-Hook
5-12 Distance-needle-hook - Choose patterns , zigzag 7 mm. Remove face plate and needle plate. Needle Take off the shuttle hook. Set the needle towards the lowest point of right side and lift it, make sure if space The tip of hook between needle and the tip of the shuttle hook holder should be 0.05~0.1mm. -
Page 21: Play Between Shuttle Driver Shaft Gear And Lower Shaft Gear
5-13 Play between shuttle driver shaft gear and lower shaft gear Remove free arm cover and needle plate. Take off the shuttle hook. Loosen three set screws (a,b,c) of the lower shaft gear (A) and move the lower shaft gear to right or left against axial direction. -
Page 22: Play Of Shuttle Driver Shaft
5-14 Play of shuttle driver shaft Remove the needle plate. There are 2 gauges (A, B) for testing the play of shuttle driver shaft. When you turn the hand wheel counter- clockwise, the shuttle hook (C) will move to rotary hook plate (D), and generate the 0.5mm 0.3mm play between the shuttle hook and the... -
Page 23: Feed-Dog Height
5-15 Feed-dog height Remove free arm cover and lift needle to its highest position. Remove presser foot. Place setting gauge (A) (0.9~1.05mm) on needle plate. The feed dog height 0.9~1.05mm then can be checked. (1) Press reverse button. At the correct height (0.9mm), the feed-dog will be moved freely forward and backward. -
Page 24: Position Of Feed-Dog In Relation To The Needle Plate (Left To Right)
5-16 Position of feed-dog in relation to the needle plate (left to right) Remove the free arm cover and free arm foot bush. Loosen the screw (a) of the feed crank shaft (A) that is on the right side. Loosen the screw (b) of the feed crank shaft (B) that is on the left side. -
Page 25: Upper Thread Tension Adjustment
5-17 U p p e r t h r e a d t e n s i o n adjustment Remove front cover and set dial tension to "4". Use a dial tension gauge (150g) (A) to take measurement. Lift the presser foot lever first, and then put the thread of tension gauge into the... -
Page 26: Shuttle Hook Tension Adjustment
5-18 S h u t t l e h o o k t e n s i o n adjustment Remove the needle plate. Use a dial tension gauge (50g) (A) to take measurement. (1) Put dial tension thread into shuttle hook (the same way as inserting the bobbin) Pull it out, the standard range should be 18~22g. -
Page 27: Motor Belt Tension
5-19 Motor belt tension Remove back cover and test tension of motor belt using belt tension gauge (A). Its standard measurement should be 200g. (1) Adjusting the belt adjusting plate (B) to regulate the improper belt's tension. The way to adjust is as following: Loosen the screw (a) of adjusting plate (B), and then move it to right, the belt will become tighter;... -
Page 28: Drop Point Of Needle
5-20 Drop point of needle - Choose patterns Place a piece of blank paper on top of the needle plate and use presser foot to secure paper by pressing presser bar lifter lever down. (1) Adjust the speed limiting adjustment lever to the slow speed and step on the foot controller lightly. -
Page 29: Forward And Reverse Stitching In Buttonhole Sewing (Feeding Pitch Of Reverse And Forward Stitching Is Not Even)
5-21 Forward and reverse stitching in buttonhole sewing (feeding pitch of reverse and forward stitching is not even) - Choose patterns Incorrect Correct Incorrect Remove belt cover. Set stitch length dial at "0.5" to "1". To sew by using thread in effect, to confirm delivery amount of forward and backward. -
Page 30: Bar Tack Density (Stitch Advances In Upper Or Lower Bar Tacking)
5-22 Bar tack density (stitch advances in upper or lower bar tacking) - Choose patterns Remove belt cover. Correct Incorrect Set stitch length dial at "0.5" to "1". To sew by using thread in effect, to confirm delivery amount so that buttonhole upper or lower stitching may not advance. -
Page 31: Buttonhole Length Adjustment
5-23 Buttonhole length adjustment - Choose patterns Remove face plate. Set the stitch length dial at "0.5" to "1". Incorrect Correct Incorrect Place button on needle plate and secure with BH presser foot. To sew by using thread in effect, to confirm if length of BH stitching is equal to length of button. -
Page 32: Bobbin Winding Problem
5-24 Bobbin winding problem Place empty bobbin on spindle and push it to the right. Put the thread into the spool rod, and put the spool rod cover on it. Lead thread from spool to back side of thread guide (A) by following the indication. -
Page 33: Circuit Diagram
6. Circuit diagram Europe... - Page 34 6. Circuit diagram North America...
- Page 35 030Y4B0101(EN)