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SERVICE MANUAL

MODEL 7312

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Summary of Contents for Magnolia 7312

Page 1: ...SERVICE MANUAL MODEL 7312 ...

Page 2: ...ing 5 Needle position 6 Zeroing the needle 7 Feed dog height 8 Feed lifting cam 9 Stretch stitch selector cam 10 V belt adjusting 11 Bobbin winder 12 Take up spring replacement and setting 13 Bobbin case tension 14 Stretch stitch sewing 15 BH balance 16 Electrical connections PAGE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16 17 ...

Page 3: ...ING THE REAR COVER 1 Unscrew the screws a b c d e f 2 Open face cover and shuttle cover and pull out the spool pins 3 Remove the rear cover in direction of arrow a b e f c d spool pins face cover shuttle cover 1 ...

Page 4: ...uring the revolution Adjustment 1 Remove rear cover 2 Loosen set screw C Hexagen M5x5 in collor 3 Plate screwdriver blade E between stop clamp motion and casting body 4 Hold collor B to left touch with slide front spherical bearing of upper shaft A then tighten set screw C 5 Take out screwdriver E 6 Recheck for end play ALL MODELS 2 A B C D E Front spherical bearing Stop clamp motion ...

Page 5: ... Check at three different points in a full revolution zero or very slight play is acceptable Adjustment 1 Loosen set screw E 2 Hold gear F slightly forward but can not turn 3 If machine marked bind must be remove backward 4 Tighten set screw E 5 Recheck pendulum timing ALL MODELS 3 F E ...

Page 6: ...ition 4 Then slowly raise needle bar to a position the distance shall be 1 mm Adjustment 1 Open face cover 2 Loosen needle bar clamp screw A 3 Slightly move needle bar B up or down until location is 1 mm 4 Tighten clamp screw Torque 15kg cm Attention 1 After completing adjustment make sure that needle is parallel to shuttle ALL MODELS A B L R 1 mm shuttle hook 4 a ...

Page 7: ...n in the left needle position 4 The point of shuttle shall be 3 2 mm to the left of needle Adjustment 1 Remove rear cover 2 Loosen 2 screw A on driver gear 3 Slightly turn driver gear B clockwise to decrease clearance and counter clockwise to increase clearance 4 Tighten both screw A and recheck ALL MODELS C A B 3 2 mm Shuttle hook 5 Lower shaft a ...

Page 8: ...ht entry should be equal distance from the edge of the needle plate hole A Adjustment 1 Open face cover 2 Loosen set screw D and B 3 Turn eccentric C as A shown correct needle location 4 Tighten set screw B and D 5 Check distance must be 0 4 mm between needle bar and stopper plate at the left or right position ALL MODELS A 5 mm D B C 0 4 mm 6 ...

Page 9: ...aight stitch 3 Shall be no or minimul movement below 0 3 mm Adjustment 1 Remove rear cover 2 Select straight stitch position 3 Loosen screw or nut A 4 Remove connecting plate B so that no or minimul movement of needle bar 5 Tighten screw or nut A ALL MODELS A B B A C Model Model 7 ...

Page 10: ... The top or the feed dog should be 0 8 1 0 mm above the surface of the needle plate Adjustment 1 Remove rear cover 2 Bring feed dog to it s highest point 3 Loosen nut A 4 Turn set screw B as required 5 Tighten nut A ALL MODELS 0 8 1 0 mm Feed dog Needle plate 8 A B ...

Page 11: ...ime teeth of feed dog are required to keep same height with that of needle plate surface Adjustment 1 Remove rear cover 2 Loosen feed lifting cam set screw Hexagon M5x5 A 3 Turn feed lifting cam B up to same height of feed dog teeth and needle plate surface As F 2 shown 4 Tighten set screw A ALL MODELS A B FIG 2 9 ...

Page 12: ...d D stitch length must be same Adjustment 1 Remove rear cover 2 Set pattern select dial at A position 3 Loosen two set screw Hexagon M4x4 E and F 4 Turn SS selector cam G up to distance above 1 mm of pin H and SS selector cam end 5 Then tighten E F two set screw MODEL JANOME 7312 E F H G E F G H A B C D 1 0 mm 10 D C B A ...

Page 13: ...out parallel of two side during pressure 300g use spring gauge measured Adjustment 1 Remove rear cover and front cover 2 Loosen two screw of motor B 3 Movement motor up and down adjusting belt tension until as required 4 Tighten two nuts ALL MODELS B C A 300g Motor belt 11 ...

Page 14: ... Replace clamp stop motion large screw A and tighten screw B 5 Recheck for proper operation Bobbin winder Check 1 Wind a bobbin and check if thread is wound evenly F or forms a cone at eigther end G or H 2 The bobbin winder should stop turning when the thread is wound to within 0 8mm 1 5mm from the outer rim of the bobbin Adjustment 1 Loosen screw J 2 If bobbin is wound unevenly as in G move threa...

Page 15: ...K I A D C L J 0 8 1 5mm F G H 11 B E 13 ...

Page 16: ...p spring should be 1 1 5 mm B 3 When this spring in operation Lift in arrow direction tension be 6g 12g Adjustment 1 Loosen set screw C 2 Turn the spring D In clockwise to increase tension In counter clockwise to decrease tension Adjust until this spring tension reaches 6g 12g 3 Tighten set screw C 6g 12g D C B 1 1 5 m m A C 14 ALL MODELS ...

Page 17: ...lly 3 Remove shuttle race cap 4 Tie race cap to thread from bobbin case 5 Hold bobbin case upside down without touching tension spring 6 Loosen tension spring adjustment screw L until weight of race cap stars pulling thread from bobbin case 7 Gradually tighten screw L until bobbin stops turning L ALL MODELS 15 ...

Page 18: ...ust be counter clockwise turn until nice pattern can be sewn out like b 5 Tighten 2 nuts F G 15 BH BALANCE Check 1 Sew a buttonhole 2 Check that both legs of the buttonhole have equal stitch density Adjustment 1 Remove rear cover 2 Placement machine in step 3 of buttonhole 3 Loosen 6mm nut B 4 Turn adjustment screw A clockwise to increase stitch length on right leg Counter clockwise to shorter sti...

Page 19: ...16 ELECTRICAL CONNECTIONS 17 Switch Light Motor 120V FDM TYPE 230V FDM TYPE Cap Motor ...

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