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SERVICE MANUAL

MODEL: NH7

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Summary of Contents for NH7

Page 1: ...SERVICE MANUAL MODEL NH7 ...

Page 2: ... BAR HEIGHT AND ALIGNMENT 9 NEEDLE SWING 10 NEEDLE DROP 11 CLEARANCE BETWEEN NEEDLE AND HOOK NO 1 12 CLEARANCE BETWEEN NEEDLE AND HOOK NO 2 13 FEED DOG HEIGHT 14 NEEDLE BAR HEIGHT 15 NEEDLE TIMING TO SHUTTLE 16 BUTTONHOLE FEED BALANCE 17 ADJUSTMENT OF RIGHT HAND LINE TACK WIDTH AND CAM FOLLOWER RELEASE AMOUNT 18 MOTOR BELT TENSION 19 WIRING 20 ...

Page 3: ...BRIC 6 INAPPROPRIATE NEEDLE SEE MECHANICAL P 15 BAR HEIGHT ADJUSTMENT NEEDLE BAR HEIGHT 7 INAPPROPRIATE NEEDLE SEE MECHANICAL P 16 TO HOOK TIMING ADJUSTMENT NEEDLE TIMING TO SHUTTLE 8 INAPPROPRIATE NEEDLE SEE MECHANICAL P 12 13 TO HOOK CLEARANCE ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND HOOK 2 FABRIC NOT 1 INCORRECT SEE MECHANICAL P 14 MOVING FEED DOG HEIGHT ADJUSTMENT FEED DOG HEIGHT 2 THREAD ON BO...

Page 4: ... THREAD 2 TOO MUCH THREAD IS ADJUST THE POSITION OF AROUND ON THE BOBBIN STOPPER 3 LINT IS STUCK INSIDE THE CLEAN THE HOOK RACE HOOK RACE 4 THREAD QUALITY IS CHANGE TO A HIGH QUALITY TOO LOW SEWING THREAD 5 THREAD IS JAMMING CLEAR OUT THE JAMMING AROUND THE BOBBIN THREAD 6 BOBBIN THREAD TENSION IS ADJUST BOBBIN THREAD P 8 TOO STRONG TENSION CORRECTLY 5 NEEDLE 1 NEEDLE IS HITTING THE SEE MECHANICAL...

Page 5: ...SE 3 INAPPROPRIATE BELT SEE MECHANICAL P 19 TENSION ADJUSTMENT MOTOR BELT TENSION 4 UPPERSHAFTGEARISLOOSE ELIMINATE THE LOOSENESS 5 NOT ENOUGH OIL OIL ALL MOVING PARTS 7 DEFORMATION 1 INAPPROPRIATE ZIGZAG SEE MECHANICAL P 10 PATTERN SYNCHRONIZATION ADJUSTMENT NEEDLE SWING 2 INAPPROPRIATE SEE MECHANICAL P 18 DISENGAGEMENT OF CAM ADJUSTMENT FOLLOWER DISENGAGEMENT OF CAM 3 UPPER THREAD TENSION ADJUST...

Page 6: ...4 SERVICE ACCESS FACE PLATE TO REMOVE 1 REMOVE THE CAP AND SETSCREW REMOVE THE FACE PLATE TO ATTACH 2 FOLLOW THE ABOVE PROCEDURE IN REVERSE CAP SETSCREW FACE PLATE ...

Page 7: ...MOVE THE FACE COVER SEE PAGE 4 2 OPEN THE SHUTTLE COVER AND REMOVE THE SETSCREWS A 3 REMOVE THE SETSCREWS B C D AND RUBBER CUSHION E 2 PCS AND THEN REMOVE THE REAR COVER TO ATTACH 4 MOUNT THE REAR COVER IN REVERSE PROCEDURE OF THE REMOVING A C E D E B CAP ...

Page 8: ...D REAR COVER SEE PAGE 4 5 2 PULL OUT THE PATTERN SELECTOR DIAL 3 LOOSEN THE SETSCREWS A B AND REMOVE THE SETSCREWS C D E F AND RUBBER CUSHION G THEN REMOVE THE FRONT COVER TO ATTACH 4 MOUNT THE FRONT COVER IN REVERSE PROCEDURE OF THE REMOVING D PATTERN SELECTOR DIAL FRONT COVER ...

Page 9: ...E THE FOOT SHOULD BE LOWERED IF THE TENSION IS OUT OF THE STANDARD RANGE ADJUST IT AS FOLLOWS ADJUSTMENT PROCEDURE 1 REMOVE THE FRONT COVER UNIT SEE PAGE 6 2 TURN THE ADJUSTING NUT C IN THE DIRECTION OF D WHEN THE UPPER THREAD TENSION IS TOO TIGHT TURN THE ADJUSTING NUT C IN THE DIRECTION OF E WHEN THE UPPER THREAD TENSION IS TOO LOOSE 3 ATTACH THE FRONT COVER UNIT MECHANICAL ADJUSTMENT ...

Page 10: ... WHEN PULLING THE THREAD IN THE DIRECTION OF B IF THE TENSION IS OUT OF THE RANGE ADJUST IT AS FOLLOWS ADJUSTMENT PROCEDURE 1 TURN THE ADJUSTING SCREW C IN THE DIRECTION OF D WHEN THE BOBBIN THREAD TENSION IS TOO TIGHT 2 TURN THE ADJUSTING SCREW C IN THE DIRECTION OF E WHEN THE BOBBIN THREAD TENSION IS TOO LOOSE MECHANICAL ADJUSTMENT COTTON THREAD 50 B C D E ...

Page 11: ...MP SOCKET OFF 3 RAISE THE PRESSER FOOT LEVER AND LOOSEN THE SCREW B ON THE PRESSER BAR HOLDER ADJUST THE DISTANCE BETWEEN THE PRESSER FOOT C AND THE NEEDLE PLATE D TO 6 0MM 0 24 4 TIGHTEN THE SCREW B SECURELY 5 TIGHTEN THE SCREWS A TO SECURE THE LAMP SOCKET 6 ATTACH THE FACE PLATE NOTE WHEN YOU TIGHTEN THE SCREW B MAKE SURE THAT BOTH SIDES OF THE PRESSER FOOT ARE PARALLEL TO THE FEED DOG SLOTS E O...

Page 12: ...ONT COVER SEE PAGE 6 2 LOOSEN TWO SETSCREWS 3 ADJUST THE NEEDLE SWING BY TURNING THE BALANCE WHEEL WHILE PRESSING THE WORM SO AS NOT TO ROTATE IT UNTIL THE NEEDLE SWING STARTS AT 2 3MM ON THE NEEDLE PLATE AFTER THE NEEDLE HAS COME OUT OF THE RIGHT SIDE OF THE NEEDLE HOLE 4 TIGHTEN TWO SETSCREWS 5 MOUNT THE FRONT COVER NOTE AFTER ADJUSTING THE NEEDLE SWING CHECK THAT THE UPPER SHAFT WORM AND GEAR R...

Page 13: ...NS SHOULD BE EQUAL IF NOT MAKE AN ADJUSTMENT AS FOLLOWS ADJUSTMENT PROCEDURE 1 REMOVE THE FACE PLATE SEE PAGE 4 2 SET THE PATTERN SELECTOR DIAL AT MAXIMUM ZIGZAG WIDTH 3 TURN THE SCREW TO ADJUST THE LEFT AND RIGHT NEEDLE DROP POSITIONS 4 ATTACH THE FACE PLATE NOTE CHECK THE HOOK TIMING AFTER THIS ADJUSTMENT MECHANICAL ADJUSTMENT BOTH CLEARANCE SHOULD BE EQUAL setscrew ...

Page 14: ...S TOO LARGE MORE THAN 0 10 MM SLIDE THE NEEDLE BAR SUPPORTER ADJUSTING PLATE IN THE DIRECTION OF B IF THE CLEARANCE IS TOO SMALL LESS THAN 0 05 MM SLIDE THE NEEDLE BAR SUPPORTER ADJUSTING PLATE IN THE DIRECTION OF C NOTE AFTER THIS ADJUSTMENT CHECK IF THE CLEARANCE BETWEEN NEEDLE AND NEEDLE PLATE IS MORE THAN 0 15MM AS SHOWN IN FIGURE D IF NOT ADJUST THE CLEARANCE BETWEEN NEEDLE AND SHUTTLE RACE B...

Page 15: ...LY MOVE THE SHUTTLE BODY UP OR DOWN TO ADJUST THE CLEARANCE BETWEEN NEEDLE AND SHUTTLE HOOK TO 0 05 0 10MM AND TIGHTEN THE SCREWS B TEMPORARY 4 TURN THE HANDWHEEL TO CHECK THE CLEARANCE BETWEEN SHUTTLE RACE SPRING AND NEEDLE IN LEFT AND RIGHT POSITIONS IF THE CLEARANCE IS NOT EQUAL ADJUST IT BY TURNING THE SHUTTLE RACE BODY 5 TIGHTEN THE TWO SHUTTLE RACE SETSCREWS B 2 PCS 6 LOOSEN THE SETSCREW ON ...

Page 16: ...DLE PLATE SHOULD BE 0 75 0 90MM IF IT IS NOT IN THE RANGE ADJUST AS FOLLOWS ADJUSTMENT PROCEDURE 1 OPEN THE SHUTTLE COVER 2 LOWER THE PRESSER FOOT AND TURN THE HANDWHEEL TOWARD YOU UNTIL THE FEED DOG COMES TO ITS HIGHEST POINT 3 TURN THE ADJUSTING SCREW TO ADJUST THE HEIGHT OF FEED DOG 0 75 0 90 MM 4 TURN THE HANDWHEEL TOWARD YOU TO RECHECK THE HEIGHT OF FEED DOG 0 75 0 90MM ADJUSTING SCREW ...

Page 17: ... PATTERN SELECTOR DIAL AT MAXIMUM ZIGZAG WITH AND NEEDLE DROP POSITION IS AT LEFT 3 OPEN THE SHUTTLE COVER 4 REMOVE THE SHUTTLE RACE RING 5 TURN THE HANDWHEEL TOWARD YOU UNTIL THE TIP OF THE SHUTTLE HOOK MEETS THE LEFT SIDE OF THE NEEDLE 6 LOOSEN THE NEEDLE BAR CONNECTING STUD SCREW A 7 ADJUST THE HEIGHT OF THE NEEDLE BAR BY MOVING THE NEEDLE BAR UPWARD OR DOWNWARD WITHOUT TURNING IT 8 TIGHTEN THE...

Page 18: ...ANDWHEEL TOWARD YOU UNTIL THE TIP OF THE SHUTTLE HOOK MEETS THE LEFT SIDE OF THE NEEDLE 6 LOOSEN THE LOWER SHAFT CRANK ARM SCREWS A 7 WHILE HOLDING THE SHUTTLE HOOK SO IT DOESN T TURN TURN THE HANDWHEEL TOWARD YOU UNTIL THE NEEDLE COMES TO ITS LOWEST POSITION THEN FURTHER TURN THE HANDWHEEL TO RAISE THE NEEDLE ABOUT 1 7 MM FROM ITS LOWEST POSITION 8 TIGHTEN THE SETSCREWS A 9 TURN THE HANDWHEEL TOW...

Page 19: ...10 STITCHES IN THE LEFT SIDE ROW FORWARD FEEDING IS CONSIDERED ACCEPTABLE ADJUSTMENT PROCEDURE 1 CONFIRM THE STITCHES BY SEWING BUTTONHOLES AND REMOVE THE CAP 2 TURN THE ADJUSTING SCREW IN THE DIRECTION OF C IN CASE OF A RIGHT STITCHES ARE ROUGH OR IN THE DIRECTION OF D IN CASE OF B LEFT STITCHES ARE ROUGH 3 MOUNT THE CAP MECHANICAL ADJUSTMENT CAP NOTCH ADJUSTING SCREW D C FORWARD FEEDING BACKWARD...

Page 20: ...HECK THE DIFFERENCE IN BOTH LINE TACK WIDTHS 2 REMOVE THE FRONT COVER SEE PAGE 6 3 ADJUST THE LINE TACK WIDTH BY TURNING THE ADJUSTING SCREW THE RIGHT SIDE OF THE LINE TACK IS FIXED SO THE ADJUSTMENT SHOULD BE DONE ON THE LEFT SIDE LINE TACK IF THE LEFT SIDE LINE TACK IS WIDER THAN THE RIGHT SIDE TURN THE ADJUSTING SCREW IN THE DIRECTION OF A IF THE RIGHT SIDE LINE TACK IS NARROWER THAN THE LEFT S...

Page 21: ...T TEETH ON THE MOTOR PULLEY 2 THE CORRECT MOTOR BELT TENSION IS THAT THE DEFLECTION OF MOTOR BELT IS ABOUT 7MM 0 28 9MM 0 36 WHEN PUSHING THE MOTOR BELT BY FINGER AT ABOUT 300 GRAMS LOAD ADJUSTMENT PROCEDURE 1 REMOVE THE FRONT COVER SEE PAGE 6 2 LOOSEN THE SCREWS A AND B 3 MOVE THE MOTOR UP OR DOWN TO ADJUST THE DEFLECTION ABOUT 7MM 0 28 9MM 0 36 4 TIGHTEN THE SCREWS A AND B 5 ATTACH THE FRONT COV...

Page 22: ...20 WIRING FOR MACHINE SOCKET UNIT WIRING MOTOR LAMP BLUE BLUE BROWN BROWN ...

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