MSK-8400B MSK-8420B Industrial Sewing Machine Instruction Manual
CONTENTS Operation instruction 1. Brief introduction 1 2. Main specifications 1 3. Installation and preparation 1 3.1 Installation 1 3.1.1 Location of the machine 1 3.1.2 Installing oil reservoir 1 3.1.3 Mounting machine head 1 3.1.4 Mounting knee lifter 2 3.1.5 Installing the motor 3.1.6 Connecting the clutch lever to the pedal 2 3 3.1.7 Installing the thread winder 3 3.1.8 Installing the thread spool stand 3 3.2 Preparation 3.2.1 Cleaning the machine 3 3 3.2.2 Examination 4 3.2.
Parts manual 1. MSK-8420B Arm parts 11 14 2. MSK-8400B Arm parts 15 18 3. Upper shaft and presser foot parts 19 22 4. MSK-8420B Needle bar motion and Lower feed parts 23 26 5. MSK-8400B1 Needle bar motion and Lower feed parts 27 30 6. MSK-8420B Rock shaft and thread looping parts 31 34 7. MSK-8400B Rock shaft and thread looping parts 35 38 8. Stitch length adjusting parts 39 40 9. Knee lifter parts 41 44 10. MSK-8420B Lubrication parts 45 48 11.MSK-8400B Lubrication parts 49 52 12.
1. Brief introduct i on Both the models adopt straight twin-needle and two horizontal hooks with auto lubrication for thread looping, sliding lever for thread take up to form two lines of lockstitch seam. The upper shaft and lower shaft is connected by ball bearing and driven by teeth-type synchronic belt; plunge oil pump lubrication system. They adopt the compound feed mechanics of feed dog, needle bar and presser foot, even if for long stitch length and long material, They can deal with them freely.
3.1.4 Knee control presser foot lifter installation(Fig.3) a. Installing Install Connector ( A ) , Bell Crank ( B ), Bell ( C ) in the order shown in Fig.3. 3 A B C b. Adjustment (Fig.4) In the order of the following: 1.When the presser foot is at its lowest position, keep the crank in the position shown by b in the figure, turn Knee Control Stop Adjusting Screw ( C ) to touch with the oil reservoir, and tighten the nut of Screw ( C ) . 2.
3.1.6 Connecting the clutch lever to the pedal (Fig.6) 1)The optimum tilt angle of pedal ( A ) with floor is approx.30 degree. 2)Adjust the clutch of the motor so that clutch lever ( C ) and draw bar ( B ) run in line. 3)The machine balance wheel should rotate counterclockwise for normal sewing when view from opposite side of balance wheel ( G ) . The motor is rotated in the same direction. The rotation can be reversed by reversing (turn over 180 deg.)the plug of motor.
3.2.2 Examination Though every machine is confirmed by strict inspection and test before delivery, the machine parts may be loosed or deformed after long. distance transportation with jolt. A thorough examination must be performed after cleaning the machine . Turn the balance wheel to see if there is running obstruction, parts collision, uneven resistance or abnormal nosie. If these exist, adjustment must be made accordingly before run. 9 oil mark 3.2.3 Precaution before Start a. Oiling (Fig.
4. Operation 4.1 Coordination between needle, thread and sewing material Please use needle DP 17,Nm125-180.The coarseness of needle should be in accordance with the nature of material. If stitch on heavy duty material with a slim needle, the needle will be easily bent, skip or thread breakage occurs, on the contrary, stitch on tightly woven material with a very coarse needle, the material will be destroyed with over-big needle. So the needle and thread should be properly selected.
4.3.2 Winding adjustment (Fig.15) 1) Wound bobbin thread should be neat and tight, if not , adjust the thread tension by turning tension stud thumb nut ( A ) of bobbin winder tension bracket. Note: nylon or polyester thread should be wound with light tension , otherwise bobbin ( D ) might be broken or deformed. 2) When the wound thread layer does not present a cylindrical shape as in Fig.15a, loosen tension bracket screw ( B ) and move tension bracket ( C ) leftward or rightward.
4.3.5 Placing bobbin (Fig.18) Note: when bobbin is placed into the bobbin case, the thread should be wound properly in the correct direction shown in the figure. 4.3.6 Drawing thread from the bobbin (Fig.19) a. Draw the thread end to Bobbin Slot (1) shown in the figure, and pull it out down through the inner bobbin stop piece. b. Hold the thread with left hand , turn the balance wheel slowly and get the bobbin thread, then draw them a little apart from the presser foot.
b. If the needle thread is too loose and the bobbin thread is too tight, then shows as Fig. 20C, And turn the thread tension screw clockwise to increase the needle thread tension; or turn loose the bobbin lace screw to reduce the bobbin thread tension. (See Fig. 21, 22) For special sewing with special thread, the tension needed can be obtained by adjusting the power and stroke of the thread take-up spring. 22 needle thread tension increase reduce 5.2 Adjusting the pressure of presser foot (Fig.
b. When the stop plate stops the balance wheel, more strength is needed to turn the balance wheel to reset the safety clutch device. C. Release the button in the bed. So the resetting of it is OK. (See Fig.26) 26 stop plate 5.3.3 Regulating the strength on the safety clutch device(Fig.27) a. When the white mark of the eccentric pin aims at the center of the rock shaft, indicates that the strength on the safety clutch device is the minimun.
5.5 Presser foot lift volume adjustment (Fig.29) when stitch on the very elastic material or the thickness of the sewing material is changed. The adjustment should be done in the following order: 1. Loosen the special screw. 2. When the centerline distance between the special screw and the presser foot lift rear crank becomes shorter, the presser foot lift volume will become longer. On the country the distance becomes longer, the lift volume will become shorter. 3.
Parts Manual
1.
1. MSK-8420B Arm Parts Item Part number Description P cs 1. 1WF1-001 Bed 1 2. 1WF1-002 Arm 1 3. Pin 2 4. Screw 1 5. Screw 3 6. 1WF1-041 Trade mark plate 1 7. 1WF1-042 Model plate 1 Nail 4 8. 9. 1WF1-015 Upper thread guide 1 10. 1WF1-016 Screw 2 11. 1WF1-017 Back cover 1 12. 1WF1-011 Screw 15 Washer 15 13. 14. 1WF1-032 Cover 2 15. 1WF1-038 Front slide plate 1 16. 1WF1-039 Screw 1 17. 1WF1-019 Tread take-up lever guard 1 18.
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1. MSK-8420B Arm Parts Item Part number Description P cs 32. 1WF1-012 Guid set plate 1 33. 1WF1-021 Set plate 1 34. 1WF1-020 Oil retainer 1 35. 1WF1-035 Tread releasing lever 1 36. 1WF1-037 Pin shaft 1 37. 1WF1-023 Thread releasing lever 1 38. 1WF1-033 Right sliding plate 1 39. 1WF1-040 Left sliding plate 1 40. 1WF1-029 Plug 1 41. 1WF1-022 Plug 1 42. 1WF1-031 Back fitting cover 1 43. 1WF1-014 Plug 1 44. 1WF1-010A Tread tension set plate assembly 1 45.
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2. MSK-8400B Arm Parts Item Part number Description P cs 1. 9WF1-007 Bed 1 2. 1WF1-002 Arm 1 3. Pin 2 4. Screw 1 5. Screw 3 6. 9WF1-005 Trade mark plate 1 7. 9WF1-006 Modle plate 1 Nail 4 8. 9. 1WF1-015 Upper thread guide 1 10. 1WF1-016 Screw 2 11. 1WF1-017 Back cover 1 12. 1WF1-011 Screw 15 Washer 15 13. 14. 1WF1-032 Ccover 2 15. 1WF1-038 Front slide plate 1 16. 1WF1-039 Screw 1 17. 1WF1-019 Thread take-up lever guard 1 18.
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2. MSK-8400B Arm Parts Item Part number Description P cs 32. 1WF1-020 Oil retainer 1 33. 9WF1-004A Throat plate 1 34. 1WF1-043 Spring retaining plate 1 35. 1WF1-023 Thread releasing lever 1 36. 1WF1-033 Right sliding plate 1 37. 1WF1-040 Left sliding plate 1 38. 1WF1-029 Plug 14.5 1 39. 1WF1-022 Plug 12.7 1 40. 1WF1-031 Back fitting cover 41. 1WF1-034 Plug 42. 1WF1-010A Thread tension set plate assembly 1 43. 1WF1-010B Thread guide bracket 1 44.
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3. Upper Shaft Presser Foot Parts Item Part number Description P cs 1. 1WF2-025 Upper shaft 1 2. 1WF2-022 Front bushing 1 3. 1WF2-023 Screw 1 4. 1WF2-024 Oil felt 1 5. 1WF2-021 Needle crank 1 6. 1WF2-020 Screw 1 7. 1WF2-007 Screw 1 8. 1WF2-010 Screw 3 9. 1WF2-009 Screw 1 10. 1WF5-026 Presser foot lift eccentric cam 1 Stop ring 1 11. 12. 1WF5-041 Slot for front crank sliding block 1 13. 1WF2-026 Stop ring 3 14. 1WF2-030 Screw 3 15.
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3. Upper Shaft Presser Foot Parts Item 32. 33. 34. 35. Part number 1WF2-038 1WF5-001 1WF5-025 1WF5-044 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 1WF5-023 1WF5-024 1WF5-045 1WF4-018 1WF5-038 1WF5-028 1WF5-037 1WF5-030 1WF5-029 1WF5-032 1WF5-033 1WF5-034 1WF5-035 50. 51. 52. 53.
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4. MSK-8420B Needle Bar And Lower Feed Parts Item Part number Description P cs 1. 1WF5-017 Oil wick 2 2. 1WF5-018 Shaft for needle bar motion holder 1 3. 1WF5-031 Screw 1 4. 1WF5-019 Screw 1 5. 1WF2-018 Oil wick 1 6. 1WF2-017 Bushing for thread take-up lever hole 1 7. 1WF2-016 Thread take-up lever 1 8. 1WF2-011 Sliding block 1 9. 1WF2-019 Screw 1 10. 1WF2-012 Oil wick 1 11. 1WF2-013 Plug 1 12. 1WF2-014 Pin for needle bar crank 1 13.
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4. MSK-8420B Needle Bar And Lower Feed Parts Item Part number Description P cs 42. 1WF5-027 Bushing for needle bar motion shaft 2 43. 1WF5-028 Set screw 2 1WF5-048 Shaft for needle bar motion 1 1WF4-018 Screw 3 1WF5-005 Rear crank for needle bar motion 1 1WF5-004 Connecting nut 1 1WF5-003 Link for needle bar notion 1 1WF5-049 Connecting screw 1 1WF5-002 Right crank for feed shaft 1 51. 1WF5-046 Pin for right crank 1 52.
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5. MSK-8400B Needle Bar And Lower Feed Parts Item Part number Description P cs 1. 1WF5-017 Oil wick 2 2. 1WF5-018 Shaft for needle bar motion holder 1 3. 1WF5-031 Screw 1 4. 1WF5-019 Screw 1 5. 1WF2-018 Oil wick 1 6. 1WF2-017 Bushing for thread take-up lever hole 1 7. 1WF2-016 Thread take-up lever 1 8. 1WF2-011 Sliding block 1 9. 1WF2-019 Screw 1 10. 1WF2-012 Oil wick 1 11. 1WF2-013 Plug 1 12. 1WF2-014 Pin for needle bar crank 1 13.
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5. MSK-8400B Needle Bar And Lower Feed Parts Item Part number Description P cs 42. 1WF5-027 Bushing for needle bar motion shaft 2 43. 1WF5-028 Set screw 2 44. 1WF5-048 Shaft for needle bar motion 1 45. 1WF4-018 Screw 3 46. 1WF5-005 Rear crank for needle bar motion 1 47. 1WF5-004 Connecting nut 1 48. 1WF5-003 Link for needle bar motion 1 49. 1WF5-049 Connecting screw 1 50. 1WF5-002 Right crank for feed shaft 1 51. 1WF5-046 Pin for right crank 1 52.
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6. MSK-8420B Rock Shaft And Thread Looping Parts Item Part number Description P cs 1. 1WF2-063 Right hook saddle 1 2. 1WF2-060 Screw 2 3. 1WF2-059 Upper bushing of hook saddle 2 4. 1WF2-061 Lower bushing of hook saddle 2 5. 1WF2-064 Hook assembly 2 6. 1WF2-065 Bobbin 2 7. 1WF2-070 Oil wick 2 8. 1WF2--069 Hinge shaft 2 9. 1WF2-072 Screw 2 10. 1WF2-071 Connecting lever 2 11. 1WF2-075 Thread finger bracket 2 12.
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6. MSK-8420B Rock Shaft And Thread Looping Parts Item Part number Description P cs 32. 1WF2-036 Oil wick 1 33. 1WF2-056 Rock shaft 1 34. 1WF2-006 Feed dog lift cam 1 35. 1WF2-019 Set screw 1 36. 1WF2-057 Right bushing for rock shaft 1 37. 1WF2-058 Oil wick 1 Split stop ring 1 38. 39. 1WF4-041 Spring 1 40. 1WF4-042 Button 2 41. 1WF4-010 Set screw 1 42. 1WF4-011 Feed cam 1 43. 1WF4-012 Feed link 1 44. Needle bearing 1 45. Spring stop ring 1 46.
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7.MSK-8400B Rock Shaft And Thread Looping Parts Item Part number Description P cs 1. 1WF2-063 Right hook saddle 1 2. 1WF2-060 Screw 1 3. 1WF2-059 Upper bushing of hook saddle 1 4. 1WF2-061 Lower bushing of hook saddle 1 5. 1WF2-064 Hook assembly 1 6. 1WF2-065 Bobbin 1 7. 1WF2-070 Oil wick 1 8. 1WF2--069 Hinge shaft 1 9. 1WF2-072 Screw 1 10. 1WF2-071 Connecting lever 1 11. 1WF2-075 Thread finger bracket 1 12.
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7.MSK-8400B Rock Shaft And Thread Looping Parts Item Part number Description P cs 32. 1WF2-056 Rock shaft 1 33. 1WF2-006 Feed dog lift cam 1 34. 1WF2-019 Set screw 1 35. 1WF2-057 Right bushing for rock shaft 1 36. 1WF2-058 Oil wick 1 Split stop ring 1 37. 38. 1WF2-041 Spring 1 39. 1WF4-0421WF4-042 Button 1 40. 1WF4-010 Set screw 2 41. 1WF4-011 Feed cam 1 42. 1WF4-012 Feed link 1 43. Needle bearing 1 44. Spring stop ring 1 45.
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8.Stitch Length Adjusting Parts Item Part number Description P cs 1. 1WF4-025 Stitch length adjusting swing lever 1 2. 1WF4-030 Screw 5 3. 1WF4-026 Set screw 1 4. 1WF4-014 Stitch length link 1 5. 1WF4-028 Stitch length link eccentric shaft 1 6. 1WF4-046 Reverse sewing shaft 1 7. 1WF4-047 Reverse sewing crank 1 8. 1WF4-027 Tension screw 1 9. 1WF4-021 Set screw 1 10. 1WF4-048 Reverse sewing lever 1 11. 1WF4-040 Sliding block 2 12. 1WF4-049 Spring 1 13.
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9.Presser Foot Lift Parts Item Part number Description P cs 1. 1WF5-040 Sliding block rail 1 2. 1WF5-039 Screw 2 3. 1WF3-011 Screw 1 4. 1WF3-010 Nut 1 5. 1WF3-013 Screw 1 6. 1WF3-014 Spring 1 7. 1WF3-012 Knee lift lever 1 8. 1WF3-015 Pressure adjusting screw 1 9. 1WF3-016 Pressure bar spring lever 1 10. 1WF3-018 Screw 1 11. 1WF3-017 Screw 1 12. 1WF3-019 Knee control crank assembly 1 13. 1WF3-021 Knee lift prop rod 1 14. 1WF3-020 Split pin 1 15.
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9.Presser Foot Lift Parts Item Part number Description P cs 33. 22T9-001A2 Screw 1 34. 22T9-001A3 Washer 1 Retain ring 1 35. 36. 1WF3-028 Knee lifter stop bracket 1 37. 22T9-001A9 Adjust screw 2 38. 22T9-001A10 Adjust nut 2 39. 22T9-007C2 Screw 1 40. 22T9-001A7 Position spring 1 41. 1WF3-027 Hinge pin 1 42. 22T9-003B4 Screw 2 43. 22T9-003B3 Connector 1 44. 22T9-003B2 Bent rod 1 45. 22T9-003B7 Screw 1 46. 22T9-003B6 Knee lifter bell bracket 1 47.
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10.MSK-8420B Lubrication Parts Item Part number Description P cs 1. 1WF6-001 Oil felt press spring 1 2. 1WF6-034 Screw 1 3. 1WF6-003 Oil felt 1 4. 1WF6-005A Oil pipe 1 5. 1WF6-004 Oil wick 1 6. 1WF6-007 Oil cup 1 7. 1WF6-008 Oil cup cover 1 Screw 2 8. 9. 1WF6-009 Spring pin 1 10. 1WF6-006 Wick press spring 1 11. 1WF6-010 Oil pipe 1 12. 1WF6-011 Oil drain pipe 1 13. 1WF6-002 Oil wick 1 14. 1WF6-013 Oil pipe position finger 1 15.
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10.MSK-8420B Lubrication Parts Item Part number Description P cs 32. 1WF6-019 Washer 1 33. 1WF6-020 Filter screw 1 34. 1WF6-017 Oil filter bracket 1 35. 1WF6-028 Oil pipe clamp 1 36. 1WF6-035 Oil pipe 1 37. 1WF6-036 Oil pipe clamp 3 38. 1WF6-038 Oil tray assembly 2 39. 1WF6-041 Oil wick 1 40. 1WF6-040 Oil pipe 1 41. 1WF6-039 Oil pipe 1 42. 1WF6-034 Pipe clamp 3 43. 1WF6-032 Oil pipe 2 44. 1WF6-037 Oil wick 1 45. 1WF6-033 Oil wick 1 46.
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11.MSK-8400B Lubrication Parts Item Part number Description P cs 1. 1WF6-001 Oil felt press spring 1 2. 1WF6-034 Screw 1 3. 1WF6-003 Oil felt 1 4. 1WF6-005A Oil pipe 1 5. 1WF6-004 Oil wick 1 6. 1WF6-007 Oil cup 1 7. 1WF6-008 Oil cup cover 1 Screw 2 8. 9. 1WF6-009 Spring pin 1 10. 1WF6-006 Wick press spring 1 11. 1WF6-010 Oil pipe 1 12. 1WF6-011 Oil drain pipe 1 13. 1WF6-002 Oil wick 1 14. 1WF6-013 Oil pipe position finger 1 15.
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11.MSK-8400B Lubrication Parts Item 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46.
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12.Accessories Item Part number Description P cs 1. 33TF-010 Accessories bag 1 2. 22T9-007F1 Hinge pin 2 3. 22T9-007F2 Hinge pin socket 2 4. 22T9-009 Cushion 2 5. 22T9-010 Cushion 2 6. 1WF2-065 Bobbin 4 7. 33TF-011 Oil pot 1 8. 33TF-016 V-belt 1 9. 1F-009 Needle 10. 1F-011 Hex key 1 11. 1F-010 Hex key 1 12. 33TF-012 Screwdriver 1 13. 33TF-013 Screwdriver 1 14. 33TF-014 Screwdriver 1 15. 58T0-007C Thread tweezer assembly 1 16.
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