Brother DT4-B281 Service Manual Download Page 1 | Manualshive

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From the library of: Superior Sewing Machine & Supply LLC

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Summary of Contents for DT4-B281

Page 1: ...SERVICE MANUAL FOR DT4 B281 FOUR NEEDLE DOUBLE CHAIN STITCHER WITH PULLER From the library of Superior Sewing Machine Supply LLC ...

Page 2: ...s 13 E Assembly and Adjustment Procedures 14 ITJ Upper and lower shafts 14 III Needle bar 15 mLooper and needle guard 17 Retainer 19 I Feeding 20 lEJ Presser 21 1 Cover 23 F How to Change the Roller 24 G Disassembly and Assembly of the Bottom Metering Device 27 li Standard Adjustnlent 30 Needle bar height 30 II Installation position of looper 30 Needle and looper timing 31 I Clearance between need...

Page 3: ... jj From the library of Superior Sewing Machine Supply LLC ...

Page 4: ...ts with puller 05 For waistbands with puller li Q Needle gauge B c Needle gauge inches 0 I 1 Full width 3 4 0 12 Full width 1 0 I 3 Full width 1 1 8 0 14 Full width 1 1 4 0 I 5 Full width 1 1 2 0 6 1 4 1 1 4 0 7 3 16 7 8 3 16 o 8 1 4 3 4 1 4 0 I 9 1 4 1 2 1 4 1 0 3 16 1 3 16 1 1 3 16 3 4 3 16 lli Device Air Type Tape Cutter Solenoid Type Tape Cutter 1 From the library of Superior Sewing Machine Su...

Page 5: ... 2 From the library of Superior Sewing Machine Supply LLC ...

Page 6: ...sm The power is transmitted in the order ofthe following numbers Needle bar mechanism 0 Coupler L 0 Upper shaft L f Thread take up crank Slide block Up and down motion t 3 From the library of Superior Sewing Machine Supply LLC ...

Page 7: ...in tD Looper holder Holder frame lever Taper shaft Pull Pull the plate so that the taper shaft end comes off the holder frame lever The spring works to Jet the looper down this side 4 From the library of Superior Sewing Machine Supply LLC ...

Page 8: ...ner mechanism 8 Retainer shaft arm 0 Retainer shaft Pin 0 Feed link 8 Retainer arm CD Retainer c Q Retainer holder Right and left motion Cl Holder shaft 5 From the library of Superior Sewing Machine Supply LLC ...

Page 9: ...C Feed eccentric lUp and down motion Turning direction 8 Lower shaft 8 Feed rod Press the push button 0 and tum the pulley so that the tip engages with the eccentric adjusting cam fj Then tum the pulley C forward and backward to change the eccentricity of the eccentric wheel assembly Q As a result the feed volume will be changed Press 0 Push button C Pulley Alignment mark 6 From the library of Sup...

Page 10: ...ft lever R G Presser lift lever L Step on the pedal Presser lift plate Presser bar clamp Thread release mechanism Tension disc Step on the pedal G Thread release arm 8 Thread release shaft 8 Thread release plate 7 From the library of Superior Sewing Machine Supply LLC ...

Page 11: ... Take up guide V belt pulley Timing pulley D Puller eccentric wheel assembly The feed volume of the puller plastic gear can be adjusted by changing the eccentricity of the puller eccentric wheel assembly The fine adjustment can be made by changing the arm length of the puller driving lever t1 with the knob 8 From the library of Superior Sewing Machine Supply LLC ...

Page 12: ... 2 Lubrication Trochoid pump 9 From the library of Superior Sewing Machine Supply LLC ...

Page 13: ...in the order of the following numbers Cover 0 Turn the pulley and drain the oil in the pump 8 X 16 4 37 X m fj Needle 8 Presser foot f Loosen the screw of presser lift stopper 10 8 Belt cover V belt 4 37 X 23 0 Oil pan From the library of Superior Sewing Machine Supply LLC ...

Page 14: ...ew 5 95 t Stud screw 4 37 I Feeding 0 Adjusting screw ____ thumb nut 8 Washer 0 Presser bar clamp ____ T rfl G Presser bar ____ _ r r 1C 0 Loosen the screw 4 37 X 9 11 Cii Packing From the library of Superior Sewing Machine Supply LLC ...

Page 15: ... 1 Retainer Looper and needle guard Holder nut Looper holder frame f Looper 12 From the library of Superior Sewing Machine Supply LLC ...

Page 16: ... the screw 6 35 G Washer Cii Ne dle bearing 14 0 Connectmg rod 0 connecting rod shaft Screw 4 37 Screw 4 37 0 Needle clamp CB Upperandlowershafts 8 Pulley 0 Timing belt 13 Screw 6 35 From the library of Superior Sewing Machine Supply LLC ...

Page 17: ...0 pressing the outer ring of the bearing 6 Tighten the bolt 0 7 Turn the V belt puiiey 8 so that the looper holder frame 8 comes to the extreme rear position 8 Turn the upper shaftL C so that the alignment mark of the upper shaft coupling L 0 faces up 9 Apply grease around the bearing 10 When the looper holder frame is at the extreme rear position and the alignment mark of the upper shaft coupling...

Page 18: ...ws Tighten the set screw on the recess side frrst 2 Put the cap 8 on the arm 3 Attach the slide block 8 to the needle bar guide with the slide block chamfer side positioned inside 4 Attach the needle bar clamp 0 to the connecting rod C and the slide block 8 5 6 Pass the needle bar CD from the upper side of the arm through the needle bar clamp 0 and tighten it temporarily Attach the needle clamp CD...

Page 19: ... the needles are at the extrem _ upper position 11 Securely tighten the set screw of the needle bar clamp 0 12 Face the needle bar take up e toward this side 13 Turn the pulley and make sure if the slide block 8 for the needle bar guide touches the slide block felt 8 when the needle bar is 1mm before its lowest position Also check if the connecting rod 8 slightly touches the felt 0 or too heavy to...

Page 20: ...per holder 0 right and left so that 0 to 0 1 mm clearance is provided between the looper and the needle when the tip of the looper 0 advances and aligns with center of the needle After adjustment secure the looper holder with the screw 5 Turn the pulley to move the looper 0 and make sure that the 2 mm clearance is provided between the looper tip and the center of the needle when the looper 0 comes...

Page 21: ...ion of the looper is extremely out of timing put the timing belt again Example When the clearance is too big on looper s advancing stroke that is the looper timing is too fast tum the timing pulley 0 toward this side 7 Loosen the set screw ofthe looper 0 Put the looper holder frame 8 down this side and remove the looper 0 8 Temporarily tighten the needle guard 0 to the looper holder 0 with the scr...

Page 22: ... position And pull or push the retainers 0 so that 0 5 to 0 8 mm clearance is provided between the retainer tips and the needles 2 Right and left positioning Turn the pulley to move the retainers 0 to the leftmost position Then move the holder shaft 0 right and left so that 0 to 0 5 mm distance is provided between the right side of the retainer 0 and the right side of the loopers 0 3 Up and down p...

Page 23: ...upper surface of the needle plate 8 by 1 mm After adjustment tighten the screw Feed dog gradient The feed dog should be parallel to the top of the needle plate Ifnecessary adjust the feed dog gradient as follows 1 Loosen the screws 8 2 Turn the feed arm shaft 8 clockwise to lower the front end of the feed dog Turn it counterclockwise to raise it 3 After adjustment tighten the screws e 20 From the ...

Page 24: ...late 8 to the presser bar clamp 4 Assemble the presser spring 8 and the presser spring guide 8 insert them as a set from the top of the arm and attach the washer 0 to the top end of the presser spring guide 8 Then pass the guide into the presser barO 5 Tighten the presser adjusting screw 0 until the distance between its top and the top surface ofthe arm becomes 33 mm Fix it with the adjusting scre...

Page 25: ...e packing f and the top of the presser bar bushing 8 with the presser foot down on the needle plate 9 Push down the the presser lift lever R Cl and make sure that 7 mm clearance is provided between the bottom of the presser foot 8 and the top of the needle plate e Ifnecessaryt adjust the presser foot lift stroke with the presser foot stopper f and tighten the screws 22 From the library of Superior...

Page 26: ... 1 Cover 8 X 16 23 1 2 Attach the upper bed cover 0 and the retainer arm cover f Install the parts shown below Belt cover V belt 4 37 X 23 Oil pan From the library of Superior Sewing Machine Supply LLC ...

Page 27: ...et screws CD and pull out the puller presser bar 8 Then the puller presser bar clamp will come off 10 Loosen the puller connecting rod coupling G and remove the roller CD 11 Remove the nuts 8 and the washer 41 12 Remove the set screw 8 and pull out the puller shaft The washer star spring e roller bush and roller CD will come off 13 Remove the flat head screw 8 and detach the roller CD 14 Loosen th...

Page 28: ...s not move along the shaft Be careful not to move the roller D fi while fixing it Install the roller Cl to the puller clutch f and align the hole with the hole Then tighten the flat head screw fJ 6 Insert the puller shaft 41 into the puller frame fD and let it through the roller Cl star spring I washer Cl roller bush fD an washer 0 in this order Attach the nuts 8 but do not tighten them at this st...

Page 29: ...mp 8 into the puller frame fi Tighten the set screw CD at the screw recess 14 Adjust the position of the puller presser bar clamp 8 so that 1 mm clearance is provided between the roller 8 and the puller lift lever 8 After adjustment tighten the set screw 8 15 Install the puller lift plate e to the puller presser bar clamp e with the stud screw 8 16 Install the puller presser spring 0 and the adjus...

Page 30: ... the four set screws of the rubber feed roller 8 and pull out the bottom metering shaft 0 7 Remove the rubber guide U 0 8 Loosen the tension nut CD and remove the stop plate 9 Remove the roller lift lever Cl 10 Loosen the set screws of the tension roller support 11 Pull out the tension roller shaft Q and remove the tension roller support CD and tension roller 0 Be careful not to take away the wash...

Page 31: ... 0 and tighten the set screw of the clutch e Be sure to tighten the set screw at the screw recess Refer to the left figure Sandwich the clutch e between the clutch cover e and rubber feed lever t1 allowing no clearance 4 Tighten the set collar 8 with the set screw not allowing play along the shaft 5 Tighten the bolt 8 6 Provide equal clearances on both sides between the rubber feed roller e and th...

Page 32: ...r feed roller e 10 Install the stop plate Cl and rubber guide U CD 11 Keep pushing the tension roller 8 against the rubber feed roller e and adjust the roller lift lever Cl loosening the set screws so that 1mm clearance is provided between the collar of the tension rod fJ and the stop plate fl Tighten the set screws after adjustment Make an adjustment with the tension nut CD if uneven sewing takes...

Page 33: ...d at the highest position At the same time turn the needle bar so that the needles come to the center of the needle holes of the needle plate 1 Looper gradient Insert the looper 0 into the looper holder 8 until it comes to the stop Locate the looper so that the side is at the right angle 90 to the retainer holder shaft 0 and tighten the screw 2 Clearance between needle and looper 30 Make an adjust...

Page 34: ... the upper edge of the needle thread hole When the looper retracts and the tip aligns with the center of the needle 4 9 mm clearance should be provided between the looper tip and the upper edge of the needle thread hole Correct timing occurs when the difference in height between the upper edge of the needle thread hole and the tip of the looper is 2 mm when the looper advances or retracts 2 Ifthe ...

Page 35: ... 5 to 0 8 mm clearance is provided between the retainer tips and the needles 2 Right and left positioning 3 32 Turn the pulley to move the retainers 0 to the leftmost position Then move the retainer holder shaft 8 right and left so that 0 to 0 5 mm distance is pro vided between the right side of the retainer and the right side of the loopers 8 Up and down positioning Turn the retainer holder shaft...

Page 36: ...eedle plate Ifnecessary adjust the feed dog gradient as follows 1 Loosen the screws 0 2 Turn the feed arm shaft 0 clockwise to lower the front end of the feed dog Turn it counterclockwise to raise it 3 After adjustment tighten the screws 0 Remove the cloth plate when adjusting the feed dog gradient Adjust the clearance between the bottom of the presser foot 0 and the top of the needle plate 8 with...

Page 37: ... more extent 1 Remove the cap 2 Turn the pulley to locate the two screws 0 upward and loosen them 3 Turn the pulley to locate the adjusting screw e upward and turning it counterclockwise 4 Tighten the screws 0 after adjustment 5 Loosen the adjusting screw e a little to provide a little play 34 From the library of Superior Sewing Machine Supply LLC ...

Page 38: ...ts f For looper thread Adjust the distance between the tip ofthe needle thread take up 0 and the center of the left screw to 45 mm Move the needle thread take up 0 to the left to tighten the needle thread Move it to the right for loosening Tum the pulley to raise the needle thread take up to the highest position and keep the surface of the needle thread take up horizontal Pull up the needle thread...

Page 39: ... Flaws 12 Too small clearance between needle and needle guard m JLToosmall clearance 13 Needles don t go through needle holes smoothly 36 Remedy Thread properly Adjust to proper pressure Replace with a good one Replace with a proper one Adjust needle for proper direction and height Replace with a new needle Replace with a good needle Adjust needle thread guides to their proper positions Replace wi...

Page 40: ...ig that it collapses Loop is big 11 Needle thread loop is too small 12 Improper installation ofretainer 37 Remedy Thread properly Adjust to proper pressure Replace with a good one Refer to Adjustment of take up thread guide Replace with a new one Replace with a new one Remedy with oil grinding stone or buffer Or replace with a new one Thread properly Adjust needle for proper direction and height R...

Page 41: ...p Refer to Needle bar height Looper 30 31 are improperly positioned stroke and Thread tension 35 Needle holes in cloth 1 Blunt needle tip Replace with a new needle are excessively large 2 Needle is too thick for cloth Replace with a thinner needle Excessive wrinkles are 1 Blunt needle tip Replace with an appropriate needle for produced when sewing material and thread 2 Improper presser foot pressu...

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