Instruction Manual - English
Page 4
... to the machine. Turn off the power switch before using the machine. If the machine is used, the weight of children. If only one hand is used for any applications other than sewing. If the machine develops a problem, contact your nearest Brother dealer or a qualified technician. y When threading the needle y When replacing the bobbin and needle y When not using the machine and when leaving the machine unattended If using a work table which...
... to the machine. Turn off the power switch before using the machine. If the machine is used, the weight of children. If only one hand is used for any applications other than sewing. If the machine develops a problem, contact your nearest Brother dealer or a qualified technician. y When threading the needle y When replacing the bobbin and needle y When not using the machine and when leaving the machine unattended If using a work table which...
Instruction Manual - English
Page 6
... the bobbin 17 5-5. Daily cleaning procedures 28 8-2. MACHINE SPECIFICATIONS 2 3. Using the knee lifter 21 5-8. THREAD TENSION 25 7-1. Installation 5 4-2. Removing the bobbin 15 5-3. Adjusting the thread take-up amount 27 8. Sewing 23 6-2. Applying grease - CONTENTS 1. Winding the lower thread 16 5-4. Number of stitches: quick-reference guide 22 6. Adjusting the thread tension 25 7-2. Adjusting the presser foot pressure 26 7-3. CLEANING 28 8-1. INSTALLATION 4 4-1. Installing the needle 14 5-2. Checking the machine pulley rotating direction...
... the bobbin 17 5-5. Daily cleaning procedures 28 8-2. MACHINE SPECIFICATIONS 2 3. Using the knee lifter 21 5-8. THREAD TENSION 25 7-1. Installation 5 4-2. Removing the bobbin 15 5-3. Adjusting the thread take-up amount 27 8. Sewing 23 6-2. Applying grease - CONTENTS 1. Winding the lower thread 16 5-4. Number of stitches: quick-reference guide 22 6. Adjusting the thread tension 25 7-2. Adjusting the presser foot pressure 26 7-3. CLEANING 28 8-1. INSTALLATION 4 4-1. Installing the needle 14 5-2. Checking the machine pulley rotating direction...
Instruction Manual - English
Page 8
...-#22 -003 #11-#16 3,000 rpm 5 mm 7 mm 13 mm 1 mm -005 #14-#22 T-8420B, 8450B, 8720B, 8750B 2 weight materials 5 For heavy-weight materials 0 Minimum lubrication 3 Semi dry Stitch function 2 Fixed needle bar 5 Split needle bar Rotary hook 4 Standard hook 7 Large hook T-8420B Max. MACHINE SPECIFICATIONS Use Lubrication type F For foundation 3 For light-weight and medium- 2. stitch length Presser foot Lifting lever height Knee lifter Feed dog height Needle (DP×5) T-8450B Max.
...-#22 -003 #11-#16 3,000 rpm 5 mm 7 mm 13 mm 1 mm -005 #14-#22 T-8420B, 8450B, 8720B, 8750B 2 weight materials 5 For heavy-weight materials 0 Minimum lubrication 3 Semi dry Stitch function 2 Fixed needle bar 5 Split needle bar Rotary hook 4 Standard hook 7 Large hook T-8420B Max. MACHINE SPECIFICATIONS Use Lubrication type F For foundation 3 For light-weight and medium- 2. stitch length Presser foot Lifting lever height Knee lifter Feed dog height Needle (DP×5) T-8450B Max.
Instruction Manual - English
Page 28
... unused needle bar from moving . Needle stop Move the stop lever (1) to the machine may result. 5-8-1. Push 3130M 5-8-2. 5. y Do not sew at speeds of over 1,000 rpm while one of stitches: quick-reference guide Sewing angle 40° No. of a single-needle machine, remove the needle which is not being used. Needle stop lever (1) to its original position automatically. Corner sewing method (T-8450B, 8750B) NOTE: If using this machine in place of stitches 6 3131M Sewing...
... unused needle bar from moving . Needle stop Move the stop lever (1) to the machine may result. 5-8-1. Push 3130M 5-8-2. 5. y Do not sew at speeds of over 1,000 rpm while one of stitches: quick-reference guide Sewing angle 40° No. of a single-needle machine, remove the needle which is not being used. Needle stop lever (1) to its original position automatically. Corner sewing method (T-8450B, 8750B) NOTE: If using this machine in place of stitches 6 3131M Sewing...
Instruction Manual - English
Page 29
... position. The machine may result in injury. Backtacking Lower thread 2915M When the reverse lever (1) is released, the feed direction will be reversed. Wait until the lower threads come out onto the feed dog. 2. If only one hand is used , the weight of the moving parts or press any objects against the machine while sewing, as a result of the motor's inertia. Turn on the power switch. 4. When it to the machine. SEWING...
... position. The machine may result in injury. Backtacking Lower thread 2915M When the reverse lever (1) is released, the feed direction will be reversed. Wait until the lower threads come out onto the feed dog. 2. If only one hand is used , the weight of the moving parts or press any objects against the machine while sewing, as a result of the motor's inertia. Turn on the power switch. 4. When it to the machine. SEWING...
Instruction Manual - English
Page 34
... circumstances, as a result of the motor's inertia. Furthermore, if the sewing machine has not been used , the weight of time, carry out the following cleaning operations should be sure to add more oil. (Refer to the needle up stop position. 2. Turn the machine pulley to move the needle to p.11.) 2991M 1. Remove the bobbin. 4. Clean the thread scraps from the rotary hook. 5. VG10) specified by mistake, which...
... circumstances, as a result of the motor's inertia. Furthermore, if the sewing machine has not been used , the weight of time, carry out the following cleaning operations should be sure to add more oil. (Refer to the needle up stop position. 2. Turn the machine pulley to move the needle to p.11.) 2991M 1. Remove the bobbin. 4. Clean the thread scraps from the rotary hook. 5. VG10) specified by mistake, which...
Instruction Manual - English
Page 40
... in seam. Problem Possible cause 1 Machine does not operate y Is a breaker or fuse blown? Lower the position of the motor's inertia. Grooves Slot Page * 7 16-20 25 * 0573M 0574M 2944M 3 Loops appear in the thread tension, or replace the bobbin or bobbin case. TROUBLESHOOTING 10. y Is the V-belt installed? 2 Upper thread is pressed. Items with a grooved feed dog. and treadle is not tight. Use a file with medium-weight material specifications, poor thread...
... in seam. Problem Possible cause 1 Machine does not operate y Is a breaker or fuse blown? Lower the position of the motor's inertia. Grooves Slot Page * 7 16-20 25 * 0573M 0574M 2944M 3 Loops appear in the thread tension, or replace the bobbin or bobbin case. TROUBLESHOOTING 10. y Is the V-belt installed? 2 Upper thread is pressed. Items with a grooved feed dog. and treadle is not tight. Use a file with medium-weight material specifications, poor thread...
Instruction Manual - English
Page 41
... the presser foot. y Is the needle too wide? Adjust the presser foot pressure. Replace the needle with slots on the underside or grooved feed dog being used? Adjust the height of thread through the needle hole at the sewing start . start Raise the position of the thread take -up spring. y If sewing light or medium-weight materials, is a presser foot with a needle that is one lower than the current needle. y Is the thread take -up at its highest position at the sewing start ? TROUBLESHOOTING Problem...
... the presser foot. y Is the needle too wide? Adjust the presser foot pressure. Replace the needle with slots on the underside or grooved feed dog being used? Adjust the height of thread through the needle hole at the sewing start . start Raise the position of the thread take -up spring. y If sewing light or medium-weight materials, is a presser foot with a needle that is one lower than the current needle. y Is the thread take -up at its highest position at the sewing start ? TROUBLESHOOTING Problem...
Instruction Manual - English
Page 42
TROUBLESHOOTING Problem 6 Uneven seam Possible cause y Is the presser foot pressure too weak? Adjust the presser foot pressure. y Is the feed dog too low? y Is the bobbin scratched? y Is the V-belt tension too low? Adjust the presser foot pressure. If the bobbin is the sewing start. y Is the lower thread tension too strong? Make the lower thread tension as weak as possible. y Is the thread take -up spring operating range too large? y Is the thread take-up amount too small? 2949M Adjust the thread take...
TROUBLESHOOTING Problem 6 Uneven seam Possible cause y Is the presser foot pressure too weak? Adjust the presser foot pressure. y Is the feed dog too low? y Is the bobbin scratched? y Is the V-belt tension too low? Adjust the presser foot pressure. If the bobbin is the sewing start. y Is the lower thread tension too strong? Make the lower thread tension as weak as possible. y Is the thread take -up spring operating range too large? y Is the thread take-up amount too small? 2949M Adjust the thread take...
Instruction Manual - English
Page 43
... the needle hole blocked? Adjust the upper thread or lower thread tension. y Is the rotary hook blocked with lubricating oil? Adjust the position of the needle hole in the feed dog? If the thread path is found again. y Does the needle drop into the center of broken needle sticking in the feed dog, reinstall the feed dog. Check the needle drop position. If the needle breaks, search for such needles to leave any pieces of the needle hole in the material. TROUBLESHOOTING Problem Possible...
... the needle hole blocked? Adjust the upper thread or lower thread tension. y Is the rotary hook blocked with lubricating oil? Adjust the position of the needle hole in the feed dog? If the thread path is found again. y Does the needle drop into the center of broken needle sticking in the feed dog, reinstall the feed dog. Check the needle drop position. If the needle breaks, search for such needles to leave any pieces of the needle hole in the material. TROUBLESHOOTING Problem Possible...
Parts Manual - English
Page 14
... 1 LINK 17 143616001 1 SHAFT 18 048060342 2 RETAINING RING, E6 19 S38428001 1 STITCH LENGTH DIAL, 7 20 SA3056001 1 FEED REGULATING STUD 21 142746002 1 FEED REGULATING SUPPORTER 22 129458102 1 SCREW, SM4.76 23 108549001 1 O RING 24 S50098101 1 POSITIONING PIN 25 100328001 1 NOTCH SPRING 26 SA2523001 1 DIAL LOCK LEVER 27 S39830101 1 SPRING 28 SA2796001 1 FEED REGULATOR 7 29 016061031 2 SET SCREW, SOCKET (CN) M6X10 30 SA2526001 1 CONNECTING ROD 31 SA2527001 1 ECCENTRIC SHAFT...
... 1 LINK 17 143616001 1 SHAFT 18 048060342 2 RETAINING RING, E6 19 S38428001 1 STITCH LENGTH DIAL, 7 20 SA3056001 1 FEED REGULATING STUD 21 142746002 1 FEED REGULATING SUPPORTER 22 129458102 1 SCREW, SM4.76 23 108549001 1 O RING 24 S50098101 1 POSITIONING PIN 25 100328001 1 NOTCH SPRING 26 SA2523001 1 DIAL LOCK LEVER 27 S39830101 1 SPRING 28 SA2796001 1 FEED REGULATOR 7 29 016061031 2 SET SCREW, SOCKET (CN) M6X10 30 SA2526001 1 CONNECTING ROD 31 SA2527001 1 ECCENTRIC SHAFT...
Parts Manual - English
Page 39
... sewing without material 4mm Needle plate, the feed dog and presser foot assembly is different from normal parts. ፧ Needle gauge Needle clamp assy Needle plate (mm) 1/8 (3.2) 3/16 (4.8) 1/4 (6.4) 3/8 (9.5) 1/2 (12.7) 5/8 (15.9) ᮡḰຠ / Normal ᮡḰຠ / Normal ᬽᱤ Feed dog 158430-001 S13588-001 153882-001 153887-001 153892-001 153897-001 Presser foot assy ᮡḰຠ / Normal T-8720B-Ga 35 A maximum stitch width specification...
... sewing without material 4mm Needle plate, the feed dog and presser foot assembly is different from normal parts. ፧ Needle gauge Needle clamp assy Needle plate (mm) 1/8 (3.2) 3/16 (4.8) 1/4 (6.4) 3/8 (9.5) 1/2 (12.7) 5/8 (15.9) ᮡḰຠ / Normal ᮡḰຠ / Normal ᬽᱤ Feed dog 158430-001 S13588-001 153882-001 153887-001 153892-001 153897-001 Presser foot assy ᮡḰຠ / Normal T-8720B-Ga 35 A maximum stitch width specification...
Instruction Manual - English
Page 4
... vomiting and diarrhea. The motor will keep turning even after the power is the danger that they do not drink the oil or eat the grease under any applications other than sewing. y When threading the needle y When replacing the bobbin and needle y When not using the machine and when leaving the machine unattended If using a work table which could result in machine, or if abnormal noises...
... vomiting and diarrhea. The motor will keep turning even after the power is the danger that they do not drink the oil or eat the grease under any applications other than sewing. y When threading the needle y When replacing the bobbin and needle y When not using the machine and when leaving the machine unattended If using a work table which could result in machine, or if abnormal noises...
Instruction Manual - English
Page 6
TABLE AND MOTOR 3 4. Checking the machine pulley rotating direction .... 13 4-4. Threading the upper thread 19 5-6. SEWING 23 6-1. Backtacking 23 6-3. Adjusting the thread tension 25 7-2. Adjusting the presser foot pressure 26 7-3. TROUBLESHOOTING 34 T-8420B, 8450B, 8720B, 8750B INSTALLATION 4 4-1. Installing the bobbin 17 5-5. Number of stitches: quick-reference guide 22 6. THREAD TENSION 25 7-1. Lubricating via the oil cover (every 6 months 29 8-3. Applying grease - ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT 33 10. Alarm display (Semi dry type ...
TABLE AND MOTOR 3 4. Checking the machine pulley rotating direction .... 13 4-4. Threading the upper thread 19 5-6. SEWING 23 6-1. Backtacking 23 6-3. Adjusting the thread tension 25 7-2. Adjusting the presser foot pressure 26 7-3. TROUBLESHOOTING 34 T-8420B, 8450B, 8720B, 8750B INSTALLATION 4 4-1. Installing the bobbin 17 5-5. Number of stitches: quick-reference guide 22 6. THREAD TENSION 25 7-1. Lubricating via the oil cover (every 6 months 29 8-3. Applying grease - ADJUSTING THE ROTARY HOOK LUBRICATION AMOUNT 33 10. Alarm display (Semi dry type ...
Instruction Manual - English
Page 8
... -003 #11-#16 3,000 rpm 5 mm 7 mm 13 mm 1 mm -005 #14-#22 T-8420B, 8450B, 8720B, 8750B 2 weight materials 5 For heavy-weight materials 0 Minimum lubrication 3 Semi dry Stitch function 2 Fixed needle bar 5 Split needle bar Rotary hook 4 Standard hook 7 Large hook T-8420B Max. stitch length Presser foot Lifting lever height Knee lifter Feed dog height Needle (DP×5) T-8450B Max. 2. MACHINE SPECIFICATIONS Use Lubrication type F For foundation 3 For light-weight and medium- sewing speed Max.
... -003 #11-#16 3,000 rpm 5 mm 7 mm 13 mm 1 mm -005 #14-#22 T-8420B, 8450B, 8720B, 8750B 2 weight materials 5 For heavy-weight materials 0 Minimum lubrication 3 Semi dry Stitch function 2 Fixed needle bar 5 Split needle bar Rotary hook 4 Standard hook 7 Large hook T-8420B Max. stitch length Presser foot Lifting lever height Knee lifter Feed dog height Needle (DP×5) T-8450B Max. 2. MACHINE SPECIFICATIONS Use Lubrication type F For foundation 3 For light-weight and medium- sewing speed Max.
Instruction Manual - English
Page 28
... not use the procedures given below to stop lever (1) will then return to the machine may result. 5-8-1. y Do not sew at speeds of over 1,000 rpm while one of stitches 6 3131M Sewing No. Needle stop Move the stop lever (1) to the "R" position. of the needle bars has been stopped. Needle stop lever (1) to the "L" position. 3128M Move the stop 3129M Press the push lever (2). Number of stitches: quick-reference guide Sewing...
... not use the procedures given below to stop lever (1) will then return to the machine may result. 5-8-1. y Do not sew at speeds of over 1,000 rpm while one of stitches 6 3131M Sewing No. Needle stop Move the stop lever (1) to the "R" position. of the needle bars has been stopped. Needle stop lever (1) to the "L" position. 3128M Move the stop 3129M Press the push lever (2). Number of stitches: quick-reference guide Sewing...
Instruction Manual - English
Page 29
... damage to the machine. While holding the two upper threads with your hand may cause your hand to normal. 2986M 23 T-8420B, 8450B, 8720B, 8750B When it to start sewing. 6. The machine may result. Turn on the power switch. 4. Depress the treadle to its original position. Lower thread 6- 2. Backtacking Lower thread 2915M When the reverse lever (1) is used without these devices attached, injury may operate if the treadle...
... damage to the machine. While holding the two upper threads with your hand may cause your hand to normal. 2986M 23 T-8420B, 8450B, 8720B, 8750B When it to start sewing. 6. The machine may result. Turn on the power switch. 4. Depress the treadle to its original position. Lower thread 6- 2. Backtacking Lower thread 2915M When the reverse lever (1) is used without these devices attached, injury may operate if the treadle...
Instruction Manual - English
Page 40
.... Lower the position of material being sewn. If using a sewing machine with a fine grain or sandpaper to check that has slots on y Is the power cord disconnected? y If the following points before starting work. Grooves Slot Page * 7 16-20 25 * 0573M 0574M 2944M 3 Loops appear in the thread tension, or replace the bobbin or bobbin case. TROUBLESHOOTING 10. TROUBLESHOOTING y Please check the following remedies do not fix the problem...
.... Lower the position of material being sewn. If using a sewing machine with a fine grain or sandpaper to check that has slots on y Is the power cord disconnected? y If the following points before starting work. Grooves Slot Page * 7 16-20 25 * 0573M 0574M 2944M 3 Loops appear in the thread tension, or replace the bobbin or bobbin case. TROUBLESHOOTING 10. TROUBLESHOOTING y Please check the following remedies do not fix the problem...
Instruction Manual - English
Page 41
... machine properly threaded? y Is the presser foot too high? TROUBLESHOOTING Problem Possible cause 4 Skipped stitches occur y Is the needle tip bent? If it is one lower than the current needle. Replace the needle with a count that is incorrect, install the needle correctly. If it is a presser foot with slots on the underside or grooved feed dog being used? y Is the presser foot pressure too weak? Adjust the height of the upper thread trailing from the needle hole...
... machine properly threaded? y Is the presser foot too high? TROUBLESHOOTING Problem Possible cause 4 Skipped stitches occur y Is the needle tip bent? If it is one lower than the current needle. Replace the needle with a count that is incorrect, install the needle correctly. If it is a presser foot with slots on the underside or grooved feed dog being used? y Is the presser foot pressure too weak? Adjust the height of the upper thread trailing from the needle hole...
Instruction Manual - English
Page 43
... through steps be loose because the thread take-up spring operating range is found again. If the needle breaks, search for such needles to leave any pieces of the needle hole in the feed dog? Adjust the upper thread or lower thread tension. y Is the thread path damaged? y Is the upper thread may be taken to apply grease. y Is the needle bent, is the needle tip broken, or is time to account for...
... through steps be loose because the thread take-up spring operating range is found again. If the needle breaks, search for such needles to leave any pieces of the needle hole in the feed dog? Adjust the upper thread or lower thread tension. y Is the thread path damaged? y Is the upper thread may be taken to apply grease. y Is the needle bent, is the needle tip broken, or is time to account for...