Brother B830 Series Service Manual Download Page 44 | Manualshive

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From the library of: Superior Sewing Machine & Supply LLC

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Summary of Contents for B830 Series

Page 1: ...e a L From the library of Superior Sewing Machine Supply LLC ...

Page 2: ...ower shaft thread trimmer and rotary hook mechanism 16 Presser mechanism 21 Thread wiper 21 1 Reverse switch mechanism 23 Reverse mechanism 23 II Cover 24 STANDARD ADJUSTMENTS 25 B831 B832 B835 B836 B882 lil Needle and feed t1mmg 8831 25 1 Adjustment of needle bar to presser bar gap Models 8831 8832 8835 8836 8882 28 Needle and rotary hook timing adjustment 29 Rotary hook to needle plate gap 31 II...

Page 3: ...immg adjustment 61 fl Clearance between rotary hook and needle plate 62 11 Clearance between rotary hook and bobbin case opener 62 Presser foot height adjustment 63 II Feed dog height adjustment 64 II Vibrating presser foot and lifting presser foot and needle timing adjustment 65 1IJ Upper feed adjustment 65 ID Vibrating presser foot and lifting presser foot vertical stroke adjustment 66 GAUGE PAR...

Page 4: ...als matenals Sew1ng speed 4000 spm 3000 spm Stitch length 0 4 mm 0 5 mm Presser foot 7 mm Presser lifter foot he1ght Knee lifter 7 mm f reed dog he1ght 1 mm Needles DP x 5 DPx5 1 1 DPx5 li 14 DPx5 li22 Model LT2 B882 LT2 8882 3 5 Use For med1 um th1ck For th1ck matenals matenals Sew1 ng speed 3000 spm St1tch length Q 7 mm Spec1al order 8mm Presser foot 7 mm Presser l1fter foot he1ght Knee lifter 1...

Page 5: ...ifter foot hetght Knee lifter 16 mm Feed dog hetght 1 0 mm Needles D P X 5 Model LS2 B837 LS2 B837 Use For th1 ck matenals Sewmg speed 3000 spm M ax stttch length 8 mm Presser foot Presser foot l1fter 10 5 mm he1ght Knee lifter 16 mm Feed dog he1ght 1 0 mm Needle D P X 17 Model LT2 B838 LT2 B838 Use For th1ck mater1 als Sew111g speed 3000 spm M ax Sti tCh length 8 mm Presser foot lPresser foot lif...

Page 6: ...Motor BACK TACK POWI R START END REPEAT ON ON ON NFEOLE POSITION UP OFF OFF OFF r YI OOWN Control box assembly SEWING SPEED M LOW HIGH Speed control VR Treadle unit SE MNG SPEED lOW HIGH I Ej From the library of Superior Sewing Machine Supply LLC ...

Page 7: ... v 226531 002 226426 002 LT2 B835 405A 705A LS2 B837 300A 50 Hz I 60Hz 3000 spm 105 Pulley I 90 Pulley 226389 000 224506 001 12 1 226393 001 5 30 224396 030 110 220 v 100 200 v 226531 002 226426 002 When ordering a motor be sure to specify the sewing mach1ne model number intended matenals to be used and either single or three phase Parts in the above table are for both smgle and three phase machin...

Page 8: ... up lever v1a thread take up lever slide block 0 wh1ch 1s connected to needle bar crank rod 0 l I NEEDLE FEED MECHANISM When pulley 0 turns 1n the arrow d1rect10n ItSrotating motion IS conveyed to upper shaft f to turn t1m1ng belt wheel upper 0 2 The mouon IS conveyed to t1m1ng belt wheel lower 0 v1 a tlmmg belt 0 3 Eccentr1c wheel 0 wh1ch 1s connected to lower shaft 0 rotates v1a t1m1ng belt whee...

Page 9: ...contain a left side rotary hook etc because of the one needle IT FEED MECHANISM 1 When pu lley 0 turns in the arrow direction its rotating motion IS conveyed to upper shaft f to turn timing belt wheel upper O 2 The motion IS conveyed to timmg belt wheel lower 0 via timing belt 0 3 Eccentric wheel 8 which is connected to lower shaft 0 rotates via timing belt wheel low er 0 and lower shaft 0 4 Level...

Page 10: ...is being controlled by the shape of knife driving cam e After returning movable knife solenoid 8 is OFF and knife main lever roller G is released from knife driving cam recess e TENSION RELEASER MECHANISM 1 2 3 4 5 6 7 When thread trimming signal comes from synchronizer solenoid 8 is ON and plunger 8 is pulled in the arrow direction The motion is conveyed to knife driving pin lever 8 via knife dri...

Page 11: ...es from forward stitch to backward stitch by the inclination of feed regulator 4 Movement is conveyed to switch assembly via Switch arm 4f by SWitCh connecting arm fD THREAD WIPER Thread w1per soleno1d Thread w1per L Thread w1per R 8 After thread trtmmtng w1th the mterval of 10 100 ms thread w1 per solenotd 0 1s ON 2 The thread w1 per solenotd f dr1ves thread w1pers L and R v1a solenotd lmk 0 thre...

Page 12: ...en the convex part of sliding block assembly fB contacts the clutch lever of needle bar connecting stud 41 attached to needle bars fl the clutch in needle bar connecting stud 41 breaks away from needle bar and needle bar fl stops When the left side needle is caused to stop the reverse sequence is performed Cancellation of Needle Bar Termination 1 When push lever f is pressed it becomes loosened fr...

Page 13: ...eccentric wheel crank 0 4 Bell crank link f causes the up down mot10n of top feed presser link 0 via bell crank 0 5 The top feed presser link 0 is gu1 ded by the groove oval of middle presser gu1 de pla te and conveys mot1on to top feed presser bar Q 6 Middle presser affixed to top feed presser bar Q IS caused to move up and down 7 By loosening wing nut CD and adjusting the position of hinge screw...

Page 14: ...ISM Procedures 1 Loosen two screws 0 and remove two needles f 2 Loosen two screws 8 and remove thread wiper R 8 and thread wiper L 8 3 Remove screw 0 and after raising presser lift lever 8 remove presser foot 0 4 Remove stud screw CD and remove knee lifter lever spring CD and knee lifter lever G 5 Remove two screws 48 and connecting rod knee lifting joint ball bearing 8 Remove tension release conn...

Page 15: ...MER MECHANISM 1 Rotary Hook Procedures 1 loosen screw 0 and remove screw f then remove throat plate 0 2 Remove flat screw 0 and remove bobbin case opener 0 and washer 0 nght and lef_t 3 Turn over the mach1ne 4 loosen three screws 8 nght and left screws 5 Remove two thread cutter return spnngs 0 6 Turn the mach1ne upnght 7 Remove screws 0 0 and remove movable kn1fe CD 8 Turn the machme pulley and m...

Page 16: ...ove two flat screws 4D and remove thread tnmmer solenoid D Remove the prn terminal from the 12 prn plug 3 Lower Shaft Procedures 1 Remove t1mrng belt 8 2 Remove switch mechanism sprrng G 3 Remove screw 0 and remove spring peg O 4 Remove flat screw 0 and remove feed bar fork 0 and washer 8 5 Loosen screw 8 and remove set screw f 6 Loosen two screws 41 7 Loosen three screws fD nght and left 8 Loosen...

Page 17: ...at screws 0 and remove slider assembly 4D nght and left 8 Turn the machine over 9 Loosen two screws 4D and screws fD and and raise feed bar G forward 10 Remove rotary hook baseL 49 and then rotary hook base R CD REVERSE MECHANISM 12 pm plug Term1nal pm black Terminal pm wh1te Procedures 1 Turn the machine upright 2 Remove screw 0 and remove reverse solenoid cover f 3 Remove stud screw 0 4 Remove t...

Page 18: ...ake up lever slide block disconnects 5 Insert a wedge to needle bar rocking connecting bar 0 and remove needle bar rocking shaft assembly 0 I REVERSE SWITCH MECHANISM Term1nal pin black Termmal pin wh1te Procedures 1 Loosen flat screw 8 and remove actuator bar f 2 Remove two flat screws 8 and remove micro switch case 8 and washer 0 3 Remove two screws 0 and remove micro switch f 4 Remove the termi...

Page 19: ...4 Install stud 0 wnh screw 0 Insert stud 0 by l1ftmg t1p of oil reservo1r ITJ LOWER SHAFT THREAD TRIMMER AND ROTARY HOOK MECHANISM 1 Lower Shaft Part One Procedures 1 Turn the machme over 2 Install rotary hook base R 0 and then rotary hook base L f Install rotat1ng hook bases 0 and f w1thout the felt protrudmg 3 Insert feed bar 0 between rotary hook bases 0 and f 4 Install honzontal teed shalt 0 w...

Page 20: ...ad Trimmer and Rotary Hook fD spacen spacer fJ Cfj f Procedures 11 12 13 14 15 16 17 18 19 20 Turn the machine upright Install slider assembly 0 to rotary hook bases e and 8 With two flat screws nght and left Verify that slider assembly 0 operates smoothly right and left Turn the machine over Insert lever L 0 and rockmg arm shaft 0 to rotary hook base 8 and install rockmg arm f with set screw 0 an...

Page 21: ...arm screw at the posit1on where the tip of needle 0 enters the center of feed dog 0 needle hole Afterwards fasten screws CD and 4D in that order Fasten screw fl when the needle bar rocking crank 0 1s at the center of its swmg Adjust to 14 2 mm m step 0 above w1th models 8835 and 8836 Ill Rotary Hook Base Position Adjustment Procedures 1 Remove the throat plate 2 After aligning the dot mark of sp1r...

Page 22: ...so that the roller of knife main lever 8 can easily enter the recess of knife driving cam e Red dot T mark o Thread presser spnng o 5mm Shder Termmal prn black 12 pin plug 00 Termrnal pm white Procedures 9 Fit fork lever and screw 0 to the forked part of the plunger 10 Place pin lever and screw f and shaft f to fork lever 0 11 Fasten with screw f1 so that there is a space of 0 5 mm between base br...

Page 23: ...en bobbm case opener 0 IS fully pulled back 1n the arrow d1rect1on nqht and left Procedures 7 Loosen screw 9 remove screw 0 and remove throat plate 0 8 Turn the machme over 9 Remove kn1fe return spnng 0 nght and left 10 Turn the machme upnght 1 1 Temporan ly fasten movable knife wWith screw mand screw 4D I I I I 12 When bobb1n case opener 0 ISfully pulled back adjuSt so that the clearance between ...

Page 24: ... screw G so that there is a space of 1 mm between presser bar bracket 8 and the metal bushmg 8 Install tension release plate fB and tension release connecting rod D with two screws 4D and screw fD_ 9 Install knee lift lever CD and knee lift lever spring fD with stud screw fli Attach knee lift lever spr1ng fD to knee lift lever D 11 Presser Pressure AdJUSt by turning presser adJustment screw tD II ...

Page 25: ...Install actuator bar 0 with screw 4 4 Install micro switch cover 0 with screws 0 and washers 8 5 Install the thread wipe cord and reverse switch cord with two cord braces 0 and two screws 0 6 Install the terminal pin to the 12 pin plug 7 Adjust actuator bar play with stop screw 0 and then tighten nut 22 From the library of Superior Sewing Machine Supply LLC ...

Page 26: ...th screw f 5 Secure reverse link 0 and reverse crank 0 with screw 0 6 Secure the cords with the cord clamp Gi and screws CD 7 Install reverse solenoid cover f with screw 8 Install terminal pin to the 12 pin plug Ill REVERSE ASSEMBLY ADJUSTMENT 1 Set the feed regulator dial to the maximum setting 2 Loosen screw fD and raise the reverse soleno1d plunger G until 1t hits the back of the cylinder Pull ...

Page 27: ...crews G and washers 3 Install top cover 8 with screws 0 and f 4 Install face plate 0 with stud screw 0 and washer screw CD 5 Install cover 4D with two screws f 6 Install slide plate R fl and slide plate L e 7 Install slide plate F assembly and stop with screw fD From the library of Superior Sewing Machine Supply LLC ...

Page 28: ...lley 5 R1ght the machme head and mstall the needles tl Needle and Feed Timing Standard model 8832 8835 8882 1 Remove the needles 2 Tilt the machme head back and remove the t1m1ng belt 0 3 Turn the machme pulley until the A mark 1s aligned w1 th the red dot 4 Whil e holding the upper shaft so that 11 won t move align the arrow on the lower belt pulley 9 with the reference line on the arm bed and at...

Page 29: ...r shaft timing T mark from the center of the red dot is 2 mm Upper and Lower Shaft Timing 1 Remove riming belt O 2 Turn the machine pulley until upper and lower shaft timing T mark is in lme with the red dot 3 With main lever shaft 0 depressed turn lower belt wheel f in the arrow direction until it gets hard to turn 4 Keep the machine pulley and lower belt wheel f still and put timing belt 0 on 5 ...

Page 30: ...ace and mount the timing belt 0 Put the belt around the upper wheel first 5 Push main lever shaft 8 and turn the pulley to a point where it is hard to turn Check that at this point the red dot is in line with the T mark Allowable deviation 2 0 mm If deviation is greater than 2 0 mm remove the timing belt Additional positions are provided at 6 3 and 6 Select one retighten reference screw 8 remount ...

Page 31: ...the feed dog 0 Adjust the feed dog 0 if necessary Turn the feed dnvmg shaft 0 to adjuSt the feed dog 0 position so the needle enters the center of the needle hole D1mens1on A Model A 8831 8832 8882 13 5 mm 8835 8836 14 2 mm Ill When dimension A is too large feed dog Gap too small Gap too large The feed dog will strike the needle plate when the feed control dial is set to maximum Skipped stitches a...

Page 32: ...nt contact Be sure to readjust the needle guard position when the rotary hook is replaced 2 Needle bar rise and height Needle bar rise spectf1cat1ons vary w1th d1fferent models Use the followmg table to adJUSt the r1se The gap between reference marks is 2 4 mm Models 8831 8832 8835 8836 8882 Model R1se Feed dial Application Standard Thread cutter Standard Thread cutter Thin materials SynthetiC thr...

Page 33: ...dle center When the rotary hook pomt1s aligned with the needle center conf1rm that the spacer between the top of the needle eye and rotary hook po nt IS 1 1 5 mm 8835 8836 1 Wh en the needle bar E IS Ill liSlowest pOSi ti On the needle POSitiOn reference line a Of the needle bar IS al1 gned with the bottom edge of the needle bar bush1ng O 2 When the needle bar E IS 2 4 mm above liS lowest POSitiOn...

Page 34: ...lled all the way m the direction of the arrow Loosen screw 0 and move the bobbin r ase opener 8 right or left to adjust 1 Needle to rotary hook point gap Improper adjustment may result in improper right and left needle stitch1ng skipped stitches thread breakage broken needles 2 Needle bar rise height 3 Rotary hook to needle plate gap 4 Rotary hook to bobbm case opener gap Improper adjustment may r...

Page 35: ... after adjustment IS completed Be careful not to turn presser bar 0 Use a presser foot w1th no front gap to prevent Stitch sk1pp1ng or thread cast off at the start of sew1ng when work1ng with thm and standard matenals Refer to page 6 7 for presser foot types Subclassifica ti on Standard Thread Cutter Model 8831 I 8832 1 8835 8836 I8882 B83 2 400A I B835 400A Presser foot height 900A Presser bar li...

Page 36: ... The back of the feed dog needle hole should be smooth to enable free thread passage Frrmly tighen screw 8 after adjusting the height llllf the feed dog is too high The feed dog will strrke the needle plate Stitches will be longer than indicated by the feed regulator dial lll If the feed dog is too low Stitches will be shorter than indicated by the feed regulator dial 33 From the library of Superi...

Page 37: ...release lever 0 to adjust the tension disc gap 8 2 During thread cutting 1 The tension release crank 0 to presser bar lifter 8 gap should be 1 5 mm when the tension release is not operating 2 Loosen nut 0 remove screw f and adjust with the link 0 Ill Insufficient tenison disc gap The thread will be held too tightly and will not pass smoothly through the disc Ill Excessive tension disc gap Improper...

Page 38: ... Tighten screw 8 2 Reverse feed sewing Reverse feed stitch length is determined by the forward feed stitch length 3 Aligning forward reverse feed stitch lengths 1 Adjust the forward feed stitch length 2 Sew Stop the machine with the needle below the top of the needle plate 3 Drop the reverse lever 8 reverse feed switch all the way down to sew in reverse 4 Adjust the reverse feed stitch length by a...

Page 39: ...ew 0 r il An excessive gap between the soleno1d base and reverse feed solenoid plunger will decrease the strength of the magnet and may prevent reverse sewing Ill Reverse switch adjustment r I I 0 1 Loosen screw 0 and posrtion the pushbutton f where it is easy to reach 2 Firmly tighten the screw O 3 Loosen nut 8 and turn screw 8 to adJuSt the pushbutton so that the switch is activated when pressed...

Page 40: ...d wiper 0 to the right or left so that the thread wiper Owill positively hook the threads with its hooked end 1 More Less Solenotd plunger 6 Loosen the screws f and raise or lower the stopper 0 until the clearance between the tip of thread wiper 0 and the presser set screw 0 is about 1 mm when the thread wiper 0 returns to its ongmal position If the clearance is too little the thread wiper 0 may n...

Page 41: ...r 0 will strike the presser foot If the gap is too small thread wiping will not be properly performed Ill Step 6 If the 1 mm gap is too great the thread wiper 0 will strike the presser foot Ill Step 7 above If the 0 5 to 1 mm gap is too great thread wiping will not be properly performed If the gap is too small the thread wiper 0 will strike the needle tip 38 From the library of Superior Sewing Mac...

Page 42: ...ly on horizontal rotary hook machines stitch formation at the beginning of sewing is not possible The bobbin thread clamp spring 0 is provided on this machine to hold the thread end The bobbin thread clamp spring 0 should be installed directly below and slightly to the side of the movable knife Note Be careful th clamping area of the bobbin thread clamp spring 0 does not touch the rotary hook or f...

Page 43: ...ew f remove screw 0 and remove the needle plate 4 Tilt the head back 5 Remove the kmfe return spnng 0 and return the head to Its ong1nal POSitiOn 6 Operate the osc1llat1ng arm 0 until the screws 0 are v1S1ble with movable kn1fe on nght 7 Remove the screws 0 and remove the movable kn1fe 8 Remove the screws 0 and remove the f1 xed kn1fe 40 From the library of Superior Sewing Machine Supply LLC ...

Page 44: ...nd wrong sides 4 Fasten the needle plate With the screws e and G 5 Fasten the cover 8 with the screws 8 6 Tilt the head back and install the knife return spring 0 7 Return the head to its origmal pos1t1on 8 Install the needles m the needle clamp and lower the presser foot 011 whetstone Be sure the edge s clean and sharp Cuttmg part A ragged edge may result in thread breakage If the kn1ves become b...

Page 45: ... the main lever roller easily enters the kn1fe drivtng arm recess Tighten the nut on the stopper screw 0 so that the screw w1ll not loosen after the adJuStment 1s completed j KNIFE DRIVING LEVER ADJUSTMENT Knife driving lever 0 5 mm 0 1 When the ma1n lever shaft 0 tSat rest the kn1fe dnving lever f to movable knife base bracket 0 gap should be 0 5 mm Loosen screw 0 to adJUSt the knife dnv ng lever...

Page 46: ...reverse The needle up stop element should be at approximately 8 on the positron detector scale Adjustment Loosen screw 0 and move the thread cutter element 0 needle down stop element 8 and needle up stop element 0 respectively ZJ CORNER SEWING POSITION ADJUSTMENT 8835 8836 1 Needle feed rocker crank adjustment Turn the center screw 0 in the fork of the slide arm 8 so the needle feed rocker crank 0...

Page 47: ...be hard to drive both or e1ther needle s if the dr1ve torque is too great 3 Slide shaft adjustment 0 Shde shaft support bracket Set stop lever to R on POSition guide Loosen screw e and move lever shaft arm e right or left so that the end of slide shaft 0 is even with the end of slide shaft support 8 Lever shaft arm e will not function properly and lever shaft arm spring and set collar adjUStment w...

Page 48: ...er arm spring pressure adjustment Sprrng pressure control collar posrtron at stop lever posrtron A Sprrng pressure control collar position at stop lever posrtion L Spring pressure is properly adjusted rf the stop lever 0 stops at the center dot when the push lever 8 is released from the L and R positions Screw the collar 0 tight at the point where the stop lever arm spring 0 lightly touches the co...

Page 49: ...urn the needle bar stop 0 to adjust Presser foot height 8835 900 1 The presser foot 8 should be raised 7 mm above the needle plate by the presser bar lifter cylinder 0 2 Loosen screw 8 and vertically adjust the cylinder bracket 0 to adjust Firmly retighten the scew 8 after the adjustment is completed 46 From the library of Superior Sewing Machine Supply LLC ...

Page 50: ...1ng belt 0 1n the arm open1ng and place belt 0 around the t1m1ng belt wheel upper 2 Fit the machine pulley onto the uppar shaft and fasten It with screws e Align the front screw as VIewed In the operating direct1on of the machme w1th the arm s screw s at 3 Refer to page 50 0 needle and feed t1m1ng adjustment Mount the sew1ng mach1ne pulley so there 1s no hor1zontal play 1n the arm shaft 47 From th...

Page 51: ...read take up cover 1n place on the top cover 0 Remove bed slides L 0 and R 0 On 8838 remove the set screw and remove bed slide F fiD Loosen set screw CD and the needle 4 Remove screw 4D and needle plate 4I Remove set screw G and the vibrating presser foot Removal will be easier if the vibrat1ng presser foot 1s first ra1sed w1th the presser foot l1fter lever Loosen set screw 4 and remove the l1ftmg...

Page 52: ...ER FOOT 0 1 Loosen screw 0 and remove the knee lifter roller bracket 0 2 Remove cotter pin 0 and remove knee lifter complying bar G 3 Remove stud screw 8 and remove the knee lifter connecting rod 8 4 Remove stud screw 8 and remove knee lifter lever spring 0 and knee lifter lever 8 5 Loosen the pressure regulating thumb screw remove screw G and remove the presser bar flat spring 8 6 Remove presser ...

Page 53: ...ustment screw walking presser bar presser 0 walking presser spring fl and walking presser bar CD Loosen screw 41 Remove wing nut 8 lock washer CD spring washer 48 and hinge screw Gl Loosen screw Cl and walking bar eccentric crank fD 1 PRESSER FOOT 8 t I __J 1 Remove the cap 0 2 Loosen the screw 8 of the presser bar guide bracket 8 the screw 8ofthe presser bar lifter G and thescrewf ofthe presser b...

Page 54: ...ove the feed dog f Remove stop screw 0 and the washer and remove the bobbm case opener 0 3 Tilt the mach1ne 4 5 6 7 Loosen the three screws f 1n the p1n10n gear 0 and remove the rotary hook 0 The p1n1on gear 0 and opener lmk 0 will also come out Loosen screw and remove the feed bar liftmg fork 41 Loosen the feed driving arm CD screw 6 needle bar vibrating crank G screw and set collar screw 4 Remov...

Page 55: ...rod 0 thread take up slide 8 and thread take up lever 8 3 Pass the thread take up pin 0 and wick 0 through the thread take up lever 8 and insert this assembly in the arm Tighten screw 0 so there is no play in the thread take up lever 8 Hold the screw stop of the thread take up pin 0 up while passing the wick through the take up lever 4 Insert the needle bar frame driving shaft 0 in the needle bar ...

Page 56: ... bar guide f presser bar lifter 8 spring fl plate 8 and presser bar guide bracket e 2 Secure the vibrating presser foot 0 to the presser bar lifter 0 with screw 0 3 Tighten screw 0 so the distance from the bottom of the presser guide bushing 8 to the bottom of the presser bar guide 0 is 1 mm 4 Adjust the vibrating presser foot 0 so the distance from the top of the presser bar bushing 0 to the bott...

Page 57: ... G Screw the wing nut 4D tight at the center of the walking bar eccentric crank 0 groove 10 Secure the lifting presser foot G with screw CD 111 Lifting and Vibrating Presser Foot Vertical Timing Adjustment 1 Loosen wing nut G and retighten at the center of the walking bar eccentnc crank 0 2 Loosen bolt f 3 Set the outer presser foot fB and inner presser foot G to the needle plate tJ 4 Turn the mac...

Page 58: ... 0 4 AdJUSt the needle bar v1brat1on crank 0 so the gap between the presser bar 0 and walkmg presser bar 0 IS 8 2 mm AdJuSt the feed dnv1ng arm 0 so the needle 0 enters the m1 ddle of the feed dog F1rmly t1ghten screws 8 and O when the adJustment 1s completed 5 AdJuSt the feed bar so the feed dog extends 1 mm beyond the needle plate top and then t1ghten screw 4D 55 From the library of Superior Sew...

Page 59: ... Tighten the set screw 0 of the lower shaft gear 8 without changing the screw stop used Needle Bar Height The needle hole edge to rotary hook point gap should be 1 5 mm when the rotary hook point is aligned with the needle center Loosen screw 0 and adjust the vertical needle bar position to adjust Firmly retighten screw 0 after the adjustment is completed The rotary hook bushing determines the he1...

Page 60: ...onnecting rod e and secure it with the cotter pin CD 6 Secure the knee lifter roller bracket 8 to the knee lifter complying bar with set screw 48 Presser Foot Pressure Adjustment Adjust the presser foot pressure with presser foot adjustment screw G I TENSION RELEASE LEVER 1 Tighten set screw 8 so both ends of the thread take up spring stopper 0 are level 2 Fit the tension release lever rod 8 in pl...

Page 61: ...ket 0 and top cover f with set screw 8 2 Secure the face plate 8 with step screw 0 washer 0 and thumb screw f 3 Install bed slides L 0 and R 0 Install bed slide F 0 on model 8838 58 From the library of Superior Sewing Machine Supply LLC ...

Page 62: ... turn the pulley 1n the normal d1 rect10n unt1l ll 1S hard to turn 3 The llrnmg mark Ton the pulley should be aligned w1th the red dot on the machme head Allowable dev1allon IS 2 mm from the center of the dot Upper and lower shaft timing adjustment 1 Remove the t1mmg belt 0 2 Turn the pulley and al1gn the t1mmg mark T with the red dot 3 Press the kn1fe ma1n lever shah 0 and turn the lower belt whe...

Page 63: ... to walkmg bar presser bar gap 1s 8 2 mm If the needle does not fall exactly m the center of the needle hole m feed dog f adjuSt 11 1n the follow1ng manner 1 Remove the rear cover and loosen screw 0 2 Move needle bar support 0 little by little until the tip of the needle IS1 n l1ne w ith the center of the needle hole 1n feed dog f 3 After the adjustment tighten screw 0 securely 8 2mm tl Excessive ...

Page 64: ...ition 0 8 2 Loosen screws 8 for lower shaft spiral gear 8 and move lower shaft spiral gear 8 to the right or left so that the rotary hook point will be at the center line of the needle when the needle rises 2 4 mm with 883 7 2 8 mm with 8838 from its lowest position The rotary hook shaft has a screw seat so the above adjustment cannot be made with the pinion gear When tightening screws 8 for lower...

Page 65: ...row direction by loosening screw 8 and moving bobbin case opener f to the right or left After the adjustment tighten screw 8 securely 1 Needle to rotary hook point gap Rough seams skipped stitches thread breakage needle breakage 2 Needle bar rise height Rough seams skipped stitches thread breakage 3 Rotary hook to needle plate gap Too small improper stitch tightening 4 Rotary hook to bobbin case o...

Page 66: ... block underneath the vibrating presser foot G 3 Loosen screw 8 and raise or lower either the vibrating presser foot 8 or presser bar 0 to adjust Firmly tighten screw 8 after adjustment is completed The presser bar flat spring will cause the vibrating presser foot to drop when the screw 8 is loosened Be careful not to turn the presser bar 0 I i I I 63 From the library of Superior Sewing Machine Su...

Page 67: ... bar 0 so that feed dog 0 will nse about 1 0 mm above the needle plate F1rmly lighten screw f after the adJ UStment 1s completed The feed dog will stnke the needle plate St1tches will be larger than spec1f1ed by the feed regulator d1al ltl When the feed dog is too low Stnches wtll be smaller than spec1f1ed by the feed regulator d1al 64 From the library of Superior Sewing Machine Supply LLC ...

Page 68: ...g upper feed eccentric wheel After the adjustment tighten screws 8 securely III UPPER FEED ADJUSTMENT This machine is assembled so that upper feed needle feed matches lower feed The reference line on the needle feed rock crank matches the reference line on the collar If the upper and lower feeds do not match increase or decrease upper feed as follows to match sewing conditions 1 Loosen nut 0 2 To ...

Page 69: ...d1stance I I J Feed dog 1 Loosen wmg nut 0 and t1ghten the walk1ng bar eccentrtc crank 0 at the center of the long ax1s 2 Loosen bolt 0 3 Lower both the v1bra11ng 0 and l1f11ng 0 presser feet to the needle plate O 4 Turn the mam pulley Stop when the thread take up crank f IS level as shown in the f1 gure M ake sure there is no play m the walking bar sha ft 0 66 From the library of Superior Sewing ...

Page 70: ...le eye tJoi S 1 __l_fl Type a LT2 a832 Thread cutter 51 aB35 Thread culler 51 Needle eye t 2 ifr Subclass Needle plate 1 Type A 3 Type A 5 Type A 1 Type A 3 Type A 5 Type A 3 Type a Thread cutter 5 Type a Standard 3 5 Type A LT2 a835 3 Type a Thread cutter 5 LT2 a836 Type A LT2 a838 Type A LT2 a882 Type A Presser Foot Type A LT2 a831 1 1 3 51 a832 1 3 51 aB35 3 51 Slot Type a LT2 8832 Thread cutte...

Page 71: ...3 001 1 117368 001 1 17365 001 1 4 64 mm 3 158792 001 1 12604 001 112642 00 1 112660 001 5 117367 001 3 112605 001 5 16 7 9 mm I 58793 001 11266 1 001 112645 001 5 144882 001 3 116506 101 3 18 9 5 mm 158798 001 1 165 10 101 116498 001 5 14488 1 101 7 16 11 1 mm 3 158809 001 151596 001 151598 001 151597 00 1 1 2 I 2 7 mm 3 158797 00 1 11 6505 001 116511 001 11 6499 001 5 8 15 9 mm 5 158795 001 1165...

Page 72: ...1 5 16 7 9 mm 158793 001 112661 001 112645 001 5 144882 001 3 116506 101 318 9 5 mm 158798 001 116510 101 116498 001 5 144881 101 7I 16 11 1 mm 3 158809 001 151596 001 151598 001 151597 001 1 2 12 7mm 3 158797 001 116505 001 116511 001 116499 001 5 8 15 9 mm 5 158795 001 116507 001 116512 001 116500 001 1 1 4 31 8 mm 3 158799 001 116504 001 116508 001 116501 001 145721 001 1 1 2 38 1 mm 3 158800 0...

Page 73: ...46 00 1 149938 00 1 149942 00 1 3 8 9 5 mm 158798 001 5 155857 001 149978 001 149940 001 3 159404 001 149676 001 149673 001 1 2 12 7 mm 158797 00 1 149685 00 1 5 149677 00 1 149675 001 14967 1 001 3 149956 00 1 149949 001 149952 001 5 8 15 9 mm 158795 001 149958 00 1 5 149954 001 149948 001 149950 001 3 4 19 1 mm 5 158806 001 150526 001 150523 001 150524 001 150528 00 1 149986 001 7 8 22 2 mm 5 15...

Page 74: ... 148701 001 148683 001 3 16 4 8 mm 3 150844 001 155851 001 148702 001 148687 001 5 148703 001 148691 001 148528 001 7132 5 6 mm 3 183180 001 156816 001 156818 001 156819 001 148585 001 1 4 6 4 mm 3 150830 001 155853 001 148704 001 148693 001 5 148705 001 148695 001 5 16 7 9 mm 3 150845 001 155855 001 149692 001 149689 001 5 149691 001 149687 001 149697 001 318 9 5 mm 3 150846 001 155857 001 149939...

Page 75: ...001 183008 001 1 4 5 16 7 9 mm 151528 001 3 8 9 5 mm 151530 001 1 2 12 7 mm 15 1532 001 183014 001 5 8 15 9 mm 15 1534 001 183015 001 3 W elting feet with teeth on presser foot Part No S1ze Walkmg Foot Presser Foot Assembly 3 16 4 8 mm 151536 001 1830 16 001 1 4 6 4 mm 151538 001 183017 001 5 16 7 9 mm 15 1540 00 1 183018 001 4 W elting feet with teeth on presser foot Pan No S1ze Walk1ng Foot Pres...

Page 76: ... Foot Assembly 151548 001 183022 001 151550 001 183023 001 151552 001 183024 001 151554 001 183025 001 151556 001 183026 001 Part No Walkmg Foot Presser Foot Assembly 151558 001 183027 001 151560 001 183028 001 151562 001 183029 001 Part No Walkmg Foot Presser Foot Assembly 151564 001 183030 001 Part No Walking Foot Presser Foot Assembly 151566 001 183031 001 Part No Walking Foot Presser Foot Asse...

Page 77: ...ch 153890 0 0 1 183098 0 01 183097 0 01 153886 0 01 153887 0 01 9 5 mm 1 2 inch 153895 0 01 183100 0 01 183099 0 01 153891 0 0 1 153892 0 01 12 7 mm 5 8 lOCh 153900 0 01 183102 0 01 183101 0 01 153896 0 0 1 153897 0 01 15 9 mm 314 inch 153905 0 01 183104 0 01 183103 0 01 153901 0 0 1 153902 0 01 19 1 mm 1 inch 153910 0 01 183106 0 01 183105 0 01 153906 0 01 153907 0 0 1 25 4 mm From the library of...

Page 78: ...35 mm Note When using a thick thread excessive tension may retard the backward motion of the movable knife If the bobbin spins during thread trimming the thread may get tangled inside the bobbin or may slip out between the rotary hook and bobbin possibly causing trouble when restarting the machine A conical spring is placed under the bobbin to prevent bobbin spinning O l For thick materials Antr s...

Page 79: ... alloy to prevent sp1nn1ng dunng thread tnmm1ng 2 Insert the bobb1n 1nto the bobbm case 111 the d1recuon opposite to the rotat1ng d1recuon 3 Insert the ant1 spmnmg spnngs under the bobb1 n From the library of Superior Sewing Machine Supply LLC ...

Page 80: ...k lubrication supply to the rotary hook f the rotary hook assembly f Refer to p 7 of the supple mentary mstruct1on manual Improper thread take up Thread take up Refer to Thread Tens1on 1 spnng in the supplementary 1n spring tension and stroke stroke and tension struction manual Rotary hook point Polish the rotary hook damaged pomt Damaged needle hole in Polish the needle hold 1n the feed dog the f...

Page 81: ...pomt gap Needle plate and rotary hook gap 1 Needle bar lift stroke and height Lower thread loop spread mg Movable knife posit1on Rotary hook height 78 Set the upper thread ten s1on as weak as poss1ble Set the lower thread ten s1on as weak as poss1ble Set the thread take up spr1ng tens1on as weak as POSSible Set the thread take up spring stroke as small as possible Increase presser foot pressure De...

Page 82: ...Thread does not come eas1ly off the spool stand Pre tens1on IS too hrgh Thread take up sprrng Decrease thread take up spring tension or stroke length Decrease pre tens1on strength 1 lf Aeplace with finer needle Replace with slotless presser foot Adjust so thread feeds easily Decrease pre tens1on strength After thread cutting 1 HThread take up spnng thread trailing from stroke 1 s too large needle ...

Page 83: ... regulator screw Needle Presser foot pressure Feed dog he1 ght Needle Needle direct1on and he1ght Thread1ng Presser foot pressure Replace faulty needle Install needles 1n correct dtrect1on See the section for upper thread1ng See the section for thread tens1on See the sect1on for needle and rotary hook t1mmg adjustment See the sectoon for needle and r01ary hook t1mmg adjustment See the sect10n for ...

Page 84: ...read take up sprrng ten SIOn and movement Upper thread tens1on Lower thread tens1 on Needle d1rect1on and he1ght Needle See the section for thread tens1on See the sect1on for thread tens1on See the section for thread tension See the sect1on lor needle and rotary hook t1mmg adjustment See the section for install ing the needle Replace faulty needle See the section for needle and feed timtng adJust ...

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