Service Manual
Contents
1. Service Manual 1 DISASSENBLING OUTER PARTS 4 3 Taking off a back cover 1 Pull out a switch cover after taking out screws F p Original issue Jun 2012 Page 6 19 Model HZL 122 service Manual 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 to their top position 3 Check if feed dog height is 0 89 1 09 mm from upper surface of a needle plate 0 89 1 09mm 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 Service Manual Model 3 NEEDLE HEIGHT ee 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 Needle position is center and lowest 11 17 11 47mm from center of a shuttle race 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 of2. backward 10 15 stitches in 5 mm
3. Service Manual HZL 122 Service Manual Page 2 19 Model TABLE OF CONTENTS DISASSENBLING OUTER PARTS FEED DOG HEIGHT NEEDLE HEIGHT HOOK OF NEEDLE THREADER PRESSER FOOT HEIGT NEEDLE POSITION STRAIGHT STITCHING NEEDLE SIDE MOTION 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 OO on Or Oe The parts in the pictures can be looked differently as what they are Service Manual 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 Original issue Jun 2012 Page 3 19 Model HZL 122 Service Manual 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 F a 4 Take out 2 screws and take off a switch cover 5 Remove front and back covers with a small screw driver Service Manual 1 DISASSENBLING OUTER PARTS 3 0 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 Disconnect this connector and you can take off a front cover
4. ase and a shuttle race cover from a shuttle race 2 Set the zigzag width at maximum 3 Turning a hand wheel by hand bring up a needle from its right hand and lowest position until a shuttle hook point comes to align with left side of needle At this position check if clearance between a shuttle hook point and a needle plate eyehole is 0 0 1 mm Adjustment 1 Remove outer covers 2 Loosen screws 2 of a shuttle race set 1 and adjust the position Fix a gage and conform needle plate hole s position to a boss A boss of a gage comes out of a needle plate eyehole 3 Check if a boss of a gage goes up and down smoothly 4 Tighten screws 2 after the position is fixed service Manual Model 11 SHUTTLE SHAFT RATTLE o lt Checking the engaging of a shuttle shaft and a rack gt Checking 1 Make sure that there is no rattle in a shuttle shaft Make sure that there is no rattle in the directions as an arrow indicates Adjustment 1 Loosen 2 screws 2 of a roller board 2 Adjust the engaging of a rack 4 and a shuttle shaft gear 5 by moving a roller 3 up and down 3 Make sure not to make an upper torque heavy by adjusting engaging 4 Tighten up 2 screws 2 after adjustment service Manual Page 17 19 Model 12 IHREAD TENSION Checking 1 Set the length control dial at 5 2 Check tension number by putting polyester thread 60 through tension plat
5. be a b Adjustment 1 Turning hand wheel bv hand bring feed dogs to their front end position 2 Loosen screw 3 setting a feed rocking arm 2 to a feed rocking shaft 1 and correct condition a b 3 Tighten a screw 3 securelv after adjustment Original issue Jun 2012 Page 14 19 Model 9 NEEDLE TIMING TO SHUTTLE yee Attention Before proceeding to this section 3 NEEDLE HEIGHT must be checked first Checking 1 Remove a bobbin case and a shuttle race cover from a shuttle race Service Manual 2 Set the zigzag width at maximum 3 Turning a hand wheel by hand bring up a needle from its right hand and lowest position until a shuttle hook point comes to align with left side of needle At this position check if a shuttle hook point is 1 0 1 5 mm above the upper edge of a needle eve A A 1 0 1 5mm Adjustment 1 Loosen screws 1 of a shuttle adjust lever 2 and correct the timing by moving a lever 2 towards left or right while pressing a lever 2 against a shuttle drive arm 4 to ensure positive engagement of projection 3 on the back of a lever 2 with mating eyehole on a shuttle drive arm 4 Timing too early Move an adjust lever 2 towards right Timing too late Move an adjust lever 2 towards left 2 After adjustment tighten screws 1 A service Manual 10 CLEARANCE BETWEEN NEEDLE AND Model SHUTTLE HOOK POINT HZL 12Z Checking 1 Remove a bobbin c
6. es and pulling it 3 Keep 22 28 g at the tension of a dial The tension of a bobbin case should be 22 28 g Check the balance of top thread and bobbin thread at zigzag sewing for test Adjustment 1 Remove a face cover 2 Keep the dial position in your mind 3 Adjust tension as prescribed by turning a DT pressure adjusting gnat Turn an adjusting gnat in clockwise direction Tension becomes stronger Turn an adjusting gnat in anticlockwise direction Tension becomes weaker Service Manual 13 ADJUSTING MOTOR BELT TENSION Checking 1 Remove a face cover 2 When pushing between an upper shaft of a belt and a motor at gnats 1 as it bows 7mm 3 After adjustment tighten 2 gnats 1 Original issue Jun 2012 Page 18 19 Model HZL 122 200 g loosen 2 service Manual Model 14 ADJUSTING BUTTONHOLE PITCH BALANCE Adjust the length control dial among indicated range for BH sewing It is possible to change forward pitch with length control dial in this model Follow the following directions to change backward pitch though it is usuallv fixed 1 Adjust backward pitch bv turning a screw 1 When not removing a face cover put in a screw driver from an evehole of a face cover top and turn a screw 1 Turn itin clockwise direction Backward pitch becomes bigger Turn it in anticlockwise direction Backward pitch becomes smaller 2 Adjust backward pitch as follows 5mm
7. rew 3 connecting a zigzag guide bar 2 to a needle bar support 1 and correct needle position by moving the support 1 After adjustment tighten a screw 3 Service Manual Model 7 NEEDLE SIDE MOTION at aes Checking 1 Set the zigzag width at Maximum 2 Turning a hand wheel by hand observe needle movement from its right hand bottom position upward through a needle plate eyehole 3 A needle should not start its leftward movement until it comes up 3 4mm above the upper surface of a needle plate Needle plate Adjustment 1 Loosen 2 screws 2 of a worm gear 1 on an upper shaft 2 Holding a gear 1 turn a hand wheel and adjust set angle of a gear to the upper shaft Needle side motion too early gt Turn a hand wheel towards you Needle side motion too late gt Turn a hand wheel away from you During adjustment use only one screw to set a gear 3 After adjustment tighten 2 screws 2 at worm gear 1 Service Manual Model 8 FEED DOG CLEARANCE TO NEEDLE PLATE HOLE HZL 12Z Checking 1 Set the stitch length control at maximum 2 Turning a hand wheel by hand check and see if clearance a between a front edge of feed dogs and that of a needle plate hole at the extreme front end position of feed dogs and clearance b between a rear edge of feed dogs and that of a needle plate eyehole at the rear end position of feed dogs are approximately the same It should
8. 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 service Manual Model 4 HOOK OF NEEDLE THREADER Checking and adjustment Adjust position of a hook bv using one of accessories a small screw driver when a hook is not aligned service Manual 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 5 5mm 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 Service Manual mags m m u Model 6 Needle position Straight stitching Checking 1 Set the zigzag width at 0 2 Turning a hand wheel by hand bring a needle to its lowest position 3 Check if a needle comes to align with dent mark at the left end of a needle plate eyehole at this needle position Adjustment 1 Remove a face cover 2 Remove a thread guide plate 3 Loosen a sc
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