Janome HD718, Service Manual

Page 1: ...SERVICE MANUAL PARTS LIST MODEL HD718 First Edition 19 May 2017...

Page 2: ...STRIBUTION OF NEEDLE SWING 13 STRETCH STITCH BALANCE 14 15 FEED DOG HEIGHT 16 CLEARANCE BETWEEN NEEDLE AND HOOK 17 NEEDLE TO HOOK TIMING 18 NEEDLE BAR HEIGHT 19 BACKLASH LOWER SHAFT GEAR 20 BUTTONHOLE...

Page 3: ...needle See mechanical adjustment P 19 bar height Needle bar height 8 Inappropriate needle See mechanical adjustment P 18 to hook timing Needle to hook timing 9 Inappropriate needle See mechanical adju...

Page 4: ...bobbin correctly bobbin bobbin 2 Too much thread is Adjust the position of around on the bobbin bobbin winder stopper 3 Lint is stuck inside the Clean the shuttle bobbin holder 4 Thread quality is Ch...

Page 5: ...stment Motor belt tension 4 Not enough oil Oil all moving parts 5 Upper shaft is loose Eliminate the looseness 7 Deformation 1 Inappropriate feed See mechanical P 14 15 pattern balance adjustment Stre...

Page 6: ...r A 2 Remove the setscrews B 3 Take the face cover A off A B A B C D E F 1 Open the face cover A 2 Remove setscrews B and C 3 Take the top cover D off When you replace the top cover set the projection...

Page 7: ...SE PLATE 1 Remove 4 setscrews A 2 Remove the base plate B BED COVER 1 Remove 2 setscrews D 2 Remove the bed cover E When you replace the bed cover set the drop lever F in the left position as illustra...

Page 8: ...and take the latch off Then remove the belt cover When you attach the belt cover set the projection into the groove of the front cover FREE ARM COVER 1 Remove setscrew A and the needle plate 2 Remove...

Page 9: ...ee page 4 and the belt cover See page 6 3 Remove setscrew A B 4 Loosen setscrews C D then remove the front cover E 5 Pull the front cover off the latch F of the rear cover 6 Remove the lower part of t...

Page 10: ...ews D F 4 Lower the presser foot lever and pull away the rear panel unit from the machine frame Twist and remove the arm cover part from the presser foot lever When you attach the rear panel put the W...

Page 11: ...e thread A up in the direction of B If it is not within the above limits adjust as follows Use polyester sewing thread 50 white ADJUSTMENT PROCEDURE 1 Remove the front cover unit See page 7 2 Pull the...

Page 12: ...pen the face cover 2 Raise the presser foot lever B and loosen the hexagonal socket screw D on the presser bar holder E 3 Adjust the distance between the zigzag foot A and the needle plate C to 6 0 mm...

Page 13: ...until the needle swing starts at 2 to 3 mm above the needle plate after the needle has came from the right side of the needle hole 4 Tighten the two hexagonal socket screws on the upper shaft worm 5 A...

Page 14: ...rn the handwheel toward you 3 The needle should not swing side to side at this setting ADJUSTMENT PROCEDURE 1 Remove the top cover See page 4 2 Loosen the setscrew A 3 Move the zigzag width rod B unti...

Page 15: ...edle point A on a piece of paper by turning handwheel 6 Raise the needle to its highest position 7 Turn the stitch width dial to 6 5 8 Lower the needle to mark needle points B and C on the piece of pa...

Page 16: ...osition and stretch stitch adjuster at 2 Place a piece of paper on the needle plate and lower the presser foot 3 Turn the handwheel to mark needle points on the paper 4 The needle should penetrate the...

Page 17: ...E 1 Remove the cap F 2 If the reverse stitch length B is shorter than the forward stitch length A turn the adjusting setscrew E in the direction of C If the reverse stitch length B is longer than the...

Page 18: ...set at 3 and the presser foot is raised 1 Set the pressure dial at 3 and lower the presser foot 2 Remove the bed cover See page 5 3 Turn the handwheel toward you to set the feed dog at the highest pos...

Page 19: ...e setscrew F 2 Turning the handwheel toward you slowly by hand move the hook setplate up or down to adjust the clearance between the test pin C and the point of the hook to 0 10 to 0 05 mm Repeat the...

Page 20: ...n 4 Loosen the setscrews on the lower shaft timing gear 5 Raise the needle bar between 3 25 3 55 mm from the lowest position of the needle bar 6 Turn the lower shaft timing gear until the tip of hook...

Page 21: ...width 4 Turn the handwheel toward you until the tip of hook meets the right side of the needle 5 Loosen the setscrew C 6 Adjust the height of the needle bar by moving the needle bar upward or downwar...

Page 22: ...ounter clockwise by hand and check the play It should be within 0 8 mm If there is more than 0 8 mm backlash between the gears adjust as follows ADJUSTMENT PROCEDURE 1 Remove the bed cover See page 5...

Page 23: ...e 4 The correct buttonhole stitch balance is when there is the same coarse on the right and left sides of buttonhole ADJUSTMENT PROCEDURE 1 Remove the bed cover See page 5 2 Loosen hexagonal socket sc...

Page 24: ...d not move when you turn the stitch width dial at 0 ADJUSTMENT PROCEDURE 1 Remove the top cover See page 4 2 Turn the handwheel toward you until the needle comes to the center of the slit in the needl...

Page 25: ...the handwheel toward you 4 The machine should not feed a piece of paper at this setting ADJUSTMENT PROCEDURE 1 Remove the belt cover See page 6 2 Set the stitch selector at and the stitch length dial...

Page 26: ...O REMOVE 1 Push down the needle threader knob and pull the needle threader plate A down to remove it FIG 1 2 To install the needle threader plate line the groove up with the pin B and push it up to sn...

Page 27: ...buttonhole foot will be 3 mm longer than the actual button The length can be adjusted as follows ADJUSTMENT PROCEDURE 1 Lower the feed dog and attach foot R Then lower the presser bar 2 Loosen the set...

Page 28: ...oo early or if no bartack is sewn at all adjust as follows 1 Remove the belt cover See page 23 2 Loosen the setscrew 3 Make adjustment so the plate 2 touches the arm lightly with plate 1 pushed in the...

Page 29: ...correct motor belt tension is achieved when the belt pushes in about 7 mm 9 mm under a pressure of about 300 grams ADJUSTMENT PROCEDURE 1 Remove the belt cover See page 6 2 Loosen setscrews A and B 3...

Page 30: ...et and the connector Remove the connector from the lamp 3 Remove the setscrew A 3pcs to remove the cover 4 Remove the setscrew C 2pcs to remove the transformer TO ATTACH Follow the procedure above in...

Page 31: ...G OF TERMINAL BLOCK Trancefomer Motor 1 Remove the rear cover See page 8 2 Remove the screws A B and machine socket cover 3 Follow the above procedure in reverse A A Machine socket unit B Machine sock...

Page 32: ...utine oiling However whenever the machine is being serviced check to see if any parts needs to be lubricated OIL Use good quality sewing machine oil at the points A B C D E F G indicated by the black...

Page 33: ...PARTS LIST...

Page 34: ...32 MODEL HD718 PARTS LIST 1 2 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 20 21 22 23 24 25 19 26 3 15 22 22...

Page 35: ...009 659034003 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Top cover unit Top cover Thread guide Pre tension spring Setscrew 2x2 3 Setscrew 3x6 B Thread guide plate unit Adjust...

Page 36: ...34 MODEL HD718 PARTS LIST 1 2 9 10 4 11 7 12 16 13 8 8 6 13 14 15 17 8 18 19 19 19 20 21 22 23 23 23 24 25 26 27 28 13 29 30 4 5 6 3...

Page 37: ...9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Front cover unit Front cover Thread guide Stitch length adjusting dial Zigzag width adjusting slider Setscrew 2 3x5 B Cover plate Sets...

Page 38: ...36 MODEL HD718 PARTS LIST 46 1 2 3 4 4 5 6 7 8 9 9 15 19 18 20 21 10 11 12 38 37 29 30 31 32 33 34 35 36 43 42 41 41 45 39 40 44 13 22 23 24 17 16 14 25 26 28 27...

Page 39: ...46 Face cover unit Face cover Face cover spring Setscrew 3x10 B Thread cutter unit Face cover hinge unit Setscrew 4x6 Presser bar base plate Setscrew 4x8 Presser foot lifter Thread tension release le...

Page 40: ...38 MODEL HD718 PARTS LIST 1 2 3 15 16 13 14 17 4 8 3 24 25 26 27 28 29 30 31 9 10 19 5 6 7 12 11 18 23 20 22 21...

Page 41: ...r supporter unit Needle bar supporter Hexagonal socket screw 4x4 Needle bar unit Threader positioning set plate unit Threader positioning set plate Hexagonal socket screw 3x4 Needle bar connecting stu...

Page 42: ...40 MODEL HD718 PARTS LIST 1 2 3 4 5 6 7 8 9 10 11 12 16 9 13 14 15 18 17 20 24 23 21 23 22 19...

Page 43: ...04 652137006 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Front base plate unit Front base plate Pulling bar link Snap ring E 3 BH lever unit BH lever BH lever supporter plate Fricti...

Page 44: ...42 MODEL HD718 PARTS LIST 1 4 2 5 3 6 8 9 20 19 18 17 15 13 12 11 10 16 21 4 7 5 11 14...

Page 45: ...8005 000023803 653139012 639097024 639113016 000081005 650070509 820511108 650062003 000002806 Upper shaft unit Upper shaft Worm Hexagonal socket screw 4x4 Felt Hexagonal socket screw 5x5 Timing belt...

Page 46: ...44 MODEL HD718 PARTS LIST 1 2 3 4 5 5 6 6 7 8 9 11 10 14 13 13 12 15 16 20 17 18 19 21 22 24 13 25 26 15 31 28 27 29 30 13 13 34 38 40 36 37 39 35 32 23 6 33 6...

Page 47: ...26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 Feed rock shaft unit Feed dog Setscrew 3 5x8 Feed base spring Straight pin Hexagonal socket screw 5x5 Feed regulator unit Ring Setscrew 4x8 Feed regulator...

Page 48: ...46 MODEL HD718 PARTS LIST 1 2 3 6 4 5 7 14 10 9 12 37 38 39 12 28 29 30 11 8 13 15 21 25 26 23 22 24 20 18 27 16 17 31 17 17 19 32 40 41 42 43 34 35 33 36...

Page 49: ...21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 Hook race unit Hook body unit Hook body gear unit Hook body bottom plate Setscrew 2x2 3 Magnet Hook bottom plate Setscrew 2x2 3 Hoo...

Page 50: ...48 MODEL HD718 PARTS LIST 1 2 7 8 9 10 13 11 10 12 14 15 16 17 18 19 20 2 20 21 22 23 24 25 26 27 28 20 4 5 2 6 2 3...

Page 51: ...11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 Zigzag width rod front Snap ring E 3 Zigzag arm unit Setscrew 4x8 Zigzag width rod Zigzag width adjusting rod Reverse lever unit Reverse lever 1...

Page 52: ...50 MODEL HD718 PARTS LIST 6 26 30 8 7 36 37 26 31 32 35 33 34 34 1 2 3 4 5 9 21 22 10 13 20 12 11 21 16 17 14 15 18 19 5 29 23 26 25 27 28 24...

Page 53: ...16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 Idler unit Idler base Idler Snap ring E 6 Setscrew 4x8 Belt cover Setscrew TP 4x8 Setscrew 4x25 Machine socket whole unit Motor unit...

Page 54: ...52 MODEL HD718 PARTS LIST 1 2 3 4 5 8 17 12 14 6 10 11 13 15 20 16 9 7 19 18...

Page 55: ...29801002 820809014 540401026 C 2037 1 755800423 479701406 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Accessory set Bobbin Seam ripper unit Small spool pin Additional spool pin Screwdriver key...