Brother International CB3-B917 Service Manual

Brother International CB3-B917 Manual

Get Brother International CB3-B917 PDF manuals and user guides View all Brother International CB3-B917 manuals
Add to My Manuals
Save this manual to your list of manuals

Brother International CB3-B917 manual content summary:

  • Brother International CB3-B917 | Service Manual - Page 1
    CB3-B916A CB3-B917A SERVICE MANUAL Please read this manual before making any adjustments. CHAINSTITCH BUTTON SEWER CHAINSTITCH BUTTON SEWER WITH THREAD TRIMMER
  • Brother International CB3-B917 | Service Manual - Page 2
    product, please contact a Brother dealer. SAFETY INSTRUCTIONS 1. Safety indications and their meanings This service manual and the indications and symbols that are used on the machine itself are provided in order , the symbol at left means "you must make the ground connection".) CB3-B916A/B917A i
  • Brother International CB3-B917 | Service Manual - Page 3
    outlet. Lightning may cause problems with correct operation. Installation Machine installation should only be carried out by a qualified technician. Contact your Brother dealer or a qualified electrician for any electrical work that may need to be done. The sewing machine weighs more than 25 kg
  • Brother International CB3-B917 | Service Manual - Page 4
    . Use only the proper replacement parts as specified by Brother. If any safety devices have been removed, be absolutely sure to re-install them to their original positions and check that they operate correctly before using the machine. Any problems in machine operation which result from unauthorized
  • Brother International CB3-B917 | Service Manual - Page 5
    labels The following warning labels appear on the sewing machine. Please follow the instructions on the labels at all times when using the machine. If the labels have been removed or are difficult to read, please contact your nearest Brother dealer. 1 2 3 Safety devices: Eye guard, Finger guard
  • Brother International CB3-B917 | Service Manual - Page 6
    3-4. Button clamp 24 3-5. Clutch 25 3-6. Cover 26 4. REPLACEMENT OF PARTS------------28 4-1. Horizontal feed cam, vertical feed cam, worm gear, worm opener (B917A) 40 5-25.Thread take-up lever 40 5-26.Main tension 40 5-27.Rotor 41 5-28.Button clamp pressure 41 6. Troubleshooting 42
  • Brother International CB3-B917 | Service Manual - Page 7
    bearing 5/16 Ball presser plate Clutch assembly 2.Press Clutch lever 3.Press 101s 1.Depress pedal Clutch connects here 102s Press in with the ball presser plate 1 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 8
    adjustment cam 105s Number of stitches 12, 16 106s Number of stitches 24, 32 Stitch 32 lever Roller Number of stitches adjustment gear Roller 107s CB3-B916A/B917A 2
  • Brother International CB3-B917 | Service Manual - Page 9
    1.MECHANICAL DESCRIPTIONS 1-3. Brake mechanism 1.Drop Number of stitches control lever Clutch shaft Clutch 3.Clutch released Ball presser plate 2.Drop 108s Clutch released 109s Ball presser plate 3 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 10
    gear Triangular cam Looper (Rotary) Loop spreader Drive shaft Helical gear Drive shaft 112s 113s Loop spreader base Loop spreader groove 115s cam Loop spreader guide 114s Triangular cam CB3-B916A/B917A 4
  • Brother International CB3-B917 | Service Manual - Page 11
    Slide block 3. Rocking Vertical feed lever Feed roller Vertical feed cam Worm Worm gear Cam shaft 1. Rotation 118s Vertical feed adjustment lever Vertical feed scale 5 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 12
    Feed roller shaft 2 Horizontal feed lever Feed roller Vertical feed cam Cam shaft Worm gear Button hole spacing 2 mm 121s Button hole spacing 6 mm 122s CB3-B916A/B917A 6
  • Brother International CB3-B917 | Service Manual - Page 13
    trimming lever 1. Rotation Thread trimming lever Number of stitches adjustment lever Number of stitches 6, 8 124s Number of stitches adjustment cam Number of stitches 12, 16 125s Number of stitches 24, 32 126s Stitch 32 lever Roller Number of stitches adjustment gear 7 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 14
    clamp mechanism 1-8-1. Button clamp descent (sewing start) Button clamp lifter arm Button and arm is raised by tension spring. Driving link 1-8-2. Button clamp lift (machine stop) 127s 2 Clutch lever 1. Depress pedal Button clamp lifter arm Button and lever is pulled down. CB3-B916A/B917A 8
  • Brother International CB3-B917 | Service Manual - Page 15
    mechanism Thread tension (Tightens on final stitch only) Auxiliary tension (Opens at each stitch) Main tension (Thread tension is lever Slider Final stitch (B916A : non) During machine Machine stop operation 133s Machine stopped Sewing Final stitch B917A B916A Thread tension O O O -> X -> O
  • Brother International CB3-B917 | Service Manual - Page 16
    vomiting and diarrhoea. Keep the oil out of the reach of children. Disassembly of the sewing machine should only be carried out by a qualified technician. Use only the proper replacement parts as specified by Brother. If any safety devices have been removed, be absolutely sure to re-install them
  • Brother International CB3-B917 | Service Manual - Page 17
    2. DISASSEMBLY 2-3. Button clamp lifter Button clamp 203s 1. Spring guide 1. Spring 2. Button clamp arm 3. Holder shaft 4. Stud screw 6.35 5. Button clamp lifter arm shaft Button clamp opener claw 204s Claw adjustment plate 6. Button clamp lifter arm 11 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 18
    Feed plate 2. Needle plate 205s [B917A] 5. Movable knife 6. Fixed knife 7. Needle guard 4. Disconnecting rod 2. DISASSEMBLY 3. Loop spreader 206s [B917A] 8. Loop spreader guide 9. Loop spreader base 207s 13. Loop spreader link 12. Roller 14. Loop spreader groove cam 11. Looper setting shaft 10
  • Brother International CB3-B917 | Service Manual - Page 19
    2. DISASSEMBLY 2-5. Number of stitches changing 8. Number of stitches adjustment cam 7. Thread trimming lever Thrust washer 209s Number of stitches control lever 10. Number of stitches adjustment M gear 3. Number of stitches adjustment gear 9. Snap ring 2. Set collar 1.
  • Brother International CB3-B917 | Service Manual - Page 20
    Needle bar 3. Needle bar clamp 1. Needle thread take - up 4. Needle bar clamp connector 2. Needle bar 2. DISASSEMBLY 7. Tension release rod 5. Spring 6. Adjustment stud 9. Set collar 11. Needle bar drive lever 211s 8. Crank rod upper part Mark 10. Drive lever shaft 212s CB3-B916A/B917A Mark 14
  • Brother International CB3-B917 | Service Manual - Page 21
    . Use only the proper replacement parts as specified by Brother. If any safety devices have been removed, be absolutely sure to re-install them to their original positions and check that they operate correctly before using the machine. Any problems in machine operation which result from unauthorized
  • Brother International CB3-B917 | Service Manual - Page 22
    of the needle bar facing toward you, pass it through the needle bar clamp , and then tighten together with the needle thread take-up . Cut part 306s 307s A (TQx1) B (TQx7) < Adjustment of the needle bar height > Move the needle bar to the lowest position and align the uppermost reference line
  • Brother International CB3-B917 | Service Manual - Page 23
    the adjustment M-gear shaft . 4. Fit the number of stitches adjustment cam to the cam shaft . 5. Attach the thread trimmer lever to the clutch shaft . 310s 6. Insert the brake shaft into the hole in the bed. 7. 39). 9. Contact the stop cam side to the clutch. 311s Contact 334s 17 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 24
    shaft . 314s 14. Fit the set collar to the drive shaft , push gently, and tighten. 15. Attach the stitch 32 lever to the frame. 315s CB3-B916A/B917A 18
  • Brother International CB3-B917 | Service Manual - Page 25
    316s Thinner part 1. With and then install to the 3. Place the thread handler triangular cam onto the looper setting shaft guide and to the loop spreader link . 317s 318s Needle lowest position 319s Needle 320s 0.3 - 0.5 mm 7. Install the needle. 8. Tilt the sewing machine CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 26
    3. ASSEMBLY AND ADJUSTMENT 12. Remove the loop spreader guide . and the loop spreader 322s 13. Place the set screw collar onto the looper setting shaft so that the set screw and the needle is 0.03 - 0.08 mm when the end of the looper is aligned with the needle center. 326s CB3-B916A/B917A 20
  • Brother International CB3-B917 | Service Manual - Page 27
    . Adjust so that the clearance between the edge of the fixed knife and the center of the needle is approximately. 17. Remove the needle. 21 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 28
    3. ASSEMBLY AND ADJUSTMENT 18. Fit the loop spreader guide to the loop spreader . 332s 19. Install the movable knife to the frame 333s Contact 334s A 0.5 - 1 mm 335s 20. Rotate the stop cam to move the sewing machine to the stop position. 21. Fit the connecting rod pin to the movable knife .
  • Brother International CB3-B917 | Service Manual - Page 29
    to the frame. 24. Temporarily attach the feed plate . to the feed bracket 337s 338s 25. Put the sewing machine in the stop position, or align the arrow mark on the vertical feed adjustment lever to the (2 hole) position . Remove the needle. Needle's first point of entry 341s 23 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 30
    the feed bracket using the holder bar . Secure the holder bar using the snap and the set screw . 3. After inserting the spring and the spring guide into the button clamp lifter bracket , fit to the depression in the button arm
  • Brother International CB3-B917 | Service Manual - Page 31
    3-5. Clutch 10 - 12 mm 1. Tilt the sewing machine downward 2. Turn the spring hanger to adjust so top of the pulley . 7. Attach the ball presser plate to the clutch . 345s 8. With the sewing machine in the stop position, loosen the nut and adjust the screw so that there is a 0.8 mm clearance
  • Brother International CB3-B917 | Service Manual - Page 32
    B 348s Take-in A 349s 350s 351s B917A B916A 3. For B917A When the sewing machine is stopped and the button clamp is lifted, loosen set screw to adjust so will be at the center of the top cover. For B916A When the sewing machine is stopped and the button clamp is lifted, loosen set screw to
  • Brother International CB3-B917 | Service Manual - Page 33
    following parts to the frame. (Face plate thread guard , needle bar cover , face plate thread guide , and sub-tension thread guide ) 5. Attach the needle . 6. Attach the eye guard . 352s 7. Attach the bolt to the frame. 8. Attach the button tray on either the left or right side of the machine bed
  • Brother International CB3-B917 | Service Manual - Page 34
    Use only the proper replacement parts as specified by Brother. If any safety devices have been removed, be absolutely sure to re-install them to their original positions and check that they operate correctly before using the machine. Any problems in machine operation which result from unauthorized
  • Brother International CB3-B917 | Service Manual - Page 35
    the washer. After making the adjustment, remove the stop screw from the screw flat, insert it in the threaded part, and tighten the stop screw.) 412s 2. Fit the feed roller to the feed roller shaft . 413s the cam shaft to a depth of 0 - 0.3 mm from the frame surface. 415s 29 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 36
    A 421s Screw flat 4. REPLACEMENT OF PARTS 6. Place end A of the stop shaft by adjusting the number of stitches control lever . 422s Mark 8. Move the sewing machine to the stop position. The mark of the feed cam should align with the cam cam . Backlash becomes smaller 424s CB3-B916A/B917A 30
  • Brother International CB3-B917 | Service Manual - Page 37
    4. REPLACEMENT OF PARTS 1 mm 1 mm 416s 417s 0.5 mm 418s 10. Tighten the the button clamp driving lever . 12. Raise the sewing machine. 13. Fit the number of stitches adjustment cam to the cam shaft . 14. Temporarily tighten the thread trimming lever clutch shaft . to the 15. Adjust
  • Brother International CB3-B917 | Service Manual - Page 38
    referring to section Adjustment of [Brake] (P.39). 21. With the rear part of the clutch pressed, start the sewing machine by rotating the stop cam two or three times. 420s 0.5 mm 425s the clutch . 27. Raise the sewing machine. 28. Attach the needle and installation bolt. 427s CB3-B916A/B917A 32
  • Brother International CB3-B917 | Service Manual - Page 39
    4. REPLACEMENT OF PARTS 4-2.Cushion rubber < Disassembly > 1.Bolt 2.Open the cover and tilt the sewing machine 5.Steel ball 5/16 6.Pulley 7.Steel ball 7/32 8. and install the ball presser plate to the clutch . 5. Raise the sewing machine. 6. Attach the installation bolt. 427s 33 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 40
    > 1.Bolt 4. REPLACEMENT OF PARTS < Assembly > 428s 2.Open the cover and tilt the sewing machine downward. 3.Put the machine into the start condition. 436s 4.Operating lever pawl 0.6 mm 1. Attach the operating lever pawl to the connecting rod assembly . With the sewing machine in the start
  • Brother International CB3-B917 | Service Manual - Page 41
    . Use only the proper replacement parts as specified by Brother. If any safety devices have been removed, be absolutely sure to re-install them to their original positions and check that they operate correctly before using the machine. Any problems in machine operation which result from unauthorized
  • Brother International CB3-B917 | Service Manual - Page 42
    fixed knife. 5-9.Number of stitches adjustment cam Start the sewing machine by pressing the rear part of the clutch. The clearance between the pawl and at the final needle position. 5-10.Pawl of thread trimming lever Thread trimming lever 0.5 mm 312s Pawl Number of stitches CB3-B916A/B917A 36
  • Brother International CB3-B917 | Service Manual - Page 43
    button clamp, the slider B side should be aligned with take-in A by using the eccentric shaft. < Sewing machine in start condition > Take-in C Stopper screw Slider B 504s B917A /B 916A 505s B917A / B916A Depress fork and the driving lever pawl should be 0.6 mm. 506s 0.6 mm 37 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 44
    5-15.Auxiliary tension timing 5-16.Thread tension timing Needle bar 45 mm the upper edge of the needle bar metal, the auxiliary tension should be loosened. With the machine in the start condition, the tension discs should be 0.5 mm apart. B916A Add 1 center of the 4-hole. CB3-B916A/B917A 38
  • Brother International CB3-B917 | Service Manual - Page 45
    part of machine is in between the clutch lever shaft and clutch when the machine machine pulley two or more complete turns in the direction of the arrow. 2. Loosen the set screw at the lower part machine to stop before the correct stopping position, it might be caused by one of the following problems
  • Brother International CB3-B917 | Service Manual - Page 46
    opener claw B 517s Button clamp open lever 0 - 1 mm 5-25.Thread take-up lever Thread take-up lever Less 518s More Cotton thread Synthetic thread Adjust the thread take-up lever position according to the thread used. Cotton thread With the machine in the stop position, set the bottom of the
  • Brother International CB3-B917 | Service Manual - Page 47
    of the rotor is the position where, with the machine stopped, the 1.5 mark (B917A) is aligned with the takein. For B916A, it is where the 2 mark is aligned with the take-in. Increasing the scale setting increases the thread amount. If the thread end hangs out at the first stitch buttonhole, reduce
  • Brother International CB3-B917 | Service Manual - Page 48
    Not enough stitches 6. TROUBLESHOOTING Solution (1) Loosen the tension control nut on the main tension. (2) Lower the auxiliary tension control. B917A - 45 mm B916A - 46 mm TQx1 Page 40 38 TQx7 604s (3) Pass the thread through only one hole in the face plate thread guide when using 80 count
  • Brother International CB3-B917 | Service Manual - Page 49
    TROUBLESHOOTING Problem 2. Thread frays at final stitch (B917A) • Stitch is normal. • Thread frays between thread tension and material. Thread tension Cause Thread take-up lever pulls too much thread. The thread clamp is released too late. Solution Raise the thread - 0.2 mm 43 CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 50
    6. TROUBLESHOOTING Problem 4.Thread breaks • Thread frays and breaks. • Thread breaks at different points. • Thread breaks and stitch skips simultaneously Cause Solution Inconsistent thread looping due to (1) Use a platform feed plate. bunching of material. 612s (2) Increase the button clamp
  • Brother International CB3-B917 | Service Manual - Page 51
    6. TROUBLESHOOTING Problem 7.Thread remains in loop on odd stitches Cause Needle catches the stitch behind the material, preventing thread tightening. Solution (1) Move the loop spreader away from the needle. Page 19 35 (4-hole) (2-hole) • A frays appears in the loop. • Occurs with thread
  • Brother International CB3-B917 | Service Manual - Page 52
    Problem Cause 11. Stitches skip Insufficient needle thread length at sewing start 6. TROUBLESHOOTING Solution (1) Decrease the thread cutter lever to stitch control cam gap when the machine is 08 mm 646s (6) Decrease the needle to needle guard gap. 0.1 - 0.2 mm CB3-B916A/B917A 647s 21 35 46
  • Brother International CB3-B917 | Service Manual - Page 53
    6.TROUBLESHOOTING Problem 12. Final stitch skips Cause Looper misses thread. Solution Refer to "11.Stitches skip at sewing start" . Page 46 631s • Occurs together with thread cutter errors. • Stitch comes out when the material is removed from the machine. 13. Thread cutter errors (B917A)
  • Brother International CB3-B917 | Service Manual - Page 54
    Problem 15. Thread parts at stitch link Cause Thread splits on material top. 639s • Thread winds onto looper in machine stop position. • Occurs frequently when using heavy thread. Material 608s Solution (1) Increase the sub tension. 6. TROUBLESHOOTING Page (2) Use a finer thread. 606s (3)
  • Brother International CB3-B917 | Service Manual - Page 55
    TROUBLESHOOTING Problem 17. Clutch does not engage. (Machine stops before the stop position.) • Button clamp lift stroke is too small. • Thread is not cut. 18. Machine buttons (10 - 20 mm dia.). (factory equipment) at the sewing Use button clamp set B (S03633-001) for large start. CB3-B916A/B917A
  • Brother International CB3-B917 | Service Manual - Page 56
    SERVICE MANUAL Printed in Japan NAGOYA, JAPAN 118-916/917 I0070790 2000.07. F (1)
  • 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
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
CB3-B916A
CB3-B917A
SERVICE MANUAL
Please read this manual before making any adjustments.
CHAINSTITCH BUTTON SEWER
CHAINSTITCH BUTTON SEWER WITH THREAD TRIMMER