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Brother SB3734T Service Manual
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Brother SB3734T Service Manual

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Home Overlock Machine
SERVICE MANUAL
MODEL :
2104D/2104DAV
M343D/4100D/SB3734T
2504D/1034DX
CONFIDENTIAL
2015 Brother Industries, Ltd.
c
All rights reserved.
Published :
Nov.,2015
Revised :
Dec.,2016

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Summary of Contents for Brother SB3734T

  • Page 1 Home Overlock Machine SERVICE MANUAL MODEL : 2104D/2104DAV M343D/4100D/SB3734T 2504D/1034DX 2015 Brother Industries, Ltd. Published : Nov.,2015 CONFIDENTIAL All rights reserved. Revised : Dec.,2016...
  • Page 3 LIST of UPDATE RECORD Date Added Models Contents Feb.,2016 M343D/4100D Apr.,2016 SB3734T Jul.,2016 2504D Dec.,2016 1034DX...

  • Page 4: Table Of Contents

    1. Outline of Mechanism ................1 - 1 Main mechanisms ................1 - 2 Driveline ..................1 - 3 2. Disassembly with Assembling Note ..........2 - 1 Main frame / Covers / Upper thread guide ............2 - 2 Disconnecting cables and removing accessories ................2 - 3 Clothplate cover assy .........................2 - 4 Front cover assy ..........................2 - 5 Panel plate L assy ..........................2 - 7...
  • Page 5 Needle bar balance position adjustment ............3 - 4 Lower looper position adjustment ..............3 - 5 Lower looper timing adjustment .................3 - 6 Front / back position of lower looper adjustment ..........3 - 7 Movable needle guard position adjustment ............3 - 8 Fixed needle guard position adjustment ............3 - 9 Over looper position adjustment ..............3 - 10 Over looper timing adjustment .................3 - 11...

  • Page 6: Outline Of Mechanism

    Outline of Mechanism Main mechanisms ............. 1 - 2 Driveline ..............1 - 3 1 - 1...
  • Page 7 Outline of Mechanism Main mechanisms Main body Thread tension mechanism Upper blade & Lower blade mechanism Feed mechanism Looper mechanism Needle bar mechanism Presser foot mechanism Driving shaft mechanism 1 - 2...
  • Page 8 Outline of Mechanism Driveline (A) Up and down movement of needle bar Needle bar Needle bar Needle bar Needle bar rod Driving shaft Pulley connecting link driving lever eccentric wheel Needle bar connecting stud Needle bar Needle Needle bar connecting stud Needle bar connecting link Needle bar driving lever Needle bar...
  • Page 9 Outline of Mechanism Driveline (B) Movement of feed dog Feed link Feed rod Feed bar Driving shaft Pulley eccentric wheel Diferential Diferential Diferential Feed bar lever feed link feed bar assy feed dog Main feed bar Main feed dog Main feed bar Feed bar lever Diferential feed link Main feed dog...
  • Page 10 Outline of Mechanism Driveline (C) Movement of upper blade Upper knife Feed bar Upper knife arm Upper knife link Driving shaft Pulley plate assy eccentric wheel Upper knife holder Upper knife Feed bar eccentric wheel Upper knife Upper knife plate assy Driving shaft Pulley Upper knife link...
  • Page 11 Outline of Mechanism Driveline (D) Movement of looper Looper driving OL link OL eccentricity Spiral bevel gears Driving shaft Pulley shaft UL eccentricity OL lever O.L shaft UL link Over looper UL lever Lower looper Over looper Spiral bevel gears O.L shaft Driving shaft Pulley...

  • Page 12: Main Frame / Covers / Upper Thread Guide

    Disassembly with Assembling Note Main frame / Covers / Upper thread guide..2 - 2 Lamp / Electrical parts / Main motor unit ..2 - 18 Presser foot unit..........2 - 21 Upper blade / Lower blade / Looper ....2 - 24 Feed mechanism ..........
  • Page 13 Disassembly Main frame / Covers / Upper thread guide Main frame / Covers / Upper thread guide location diagram 2 - 2...

  • Page 14: Disconnecting Cables And Removing Accessories

    Disassembly Main frame / Covers / Upper thread guide Disconnecting cables and removing accessories 1. Disconnect the Power cord (if connected) 2. Remove the two screws (set screw, socket (CN) M3x4) to remove the two needles. 3. Remove the presser foot. 4.

  • Page 15: Clothplate Cover Assy

    Disassembly Main frame / Covers / Upper thread guide Clothplate cover assy 1. Remove the screw (screw, bind M4x6) and the screw (screw, bind M4x16) to remove the clothplate cover assy. Screw, Bind M4X6 Screw, Bind M4X16 Cothplate cover assy Screw, bind M4x6 Screw, bind M4x16 Fig.

  • Page 16: Front Cover Assy

    Disassembly Main frame / Covers / Upper thread guide Front cover assy 1. Remove the two screws (screw, bind M4x12) to remove the front cover assy. Front cover assy Screw, bind M4x12 Screw, Bind M4X12 Fig. 2-3 2 - 5...
  • Page 17 Disassembly Main frame / Covers / Upper thread guide 2. Remove the two retaining rings E3. Pull out the front cover guide shaft to remove the front cover hinge plate and the front cover spring from the front cover assy. *Assembling note •...

  • Page 18: Panel Plate L Assy

    Disassembly Main frame / Covers / Upper thread guide Panel plate L assy 1. Pull the top side of thread take-up cover to release the hook, and remove it. 2. Remove the screw (screw, bind M3x8) to remove the presser foot lever from the presser lifter shaft assy.
  • Page 19 Disassembly Main frame / Covers / Upper thread guide 6. Remove the two screws (tapping screw, pan V M3x8) to remove the needle thread take-up guide and the needle thread separator from the panel plate L assy. 7. Remove the screw (tapping screw, pan V M3x8) to remove the needle thread guide O from the panel plate L assy.

  • Page 20: Rear Cover Assy

    Disassembly Main frame / Covers / Upper thread guide Rear cover assy 1. Remove the screw (set screw) to remove the hand wheel. 2. Remove the two screws (tapping screw, pan V M4x10) to remove the rear cover assy. Set Screw Rear cover assy Tapping screw, pan V M4X10 Hand wheel...

  • Page 21: Spool Stand Base Assy

    Disassembly Main frame / Covers / Upper thread guide Spool stand base assy 1. Remove the four spool cushions from the spool stand base assy. 2. Remove the two screws (tapping screw, pan V M3x8) to remove the spool stand base assy from the rear cover assy.
  • Page 22 Disassembly Main frame / Covers / Upper thread guide 3. Remove the screw (tapping screw, pan V M2x6) to remove the thread guide from the spool stand shaft. 4. Pull out the spool stand shaft from the spool stand base. 5.

  • Page 23: Thread Tension L Assy

    Disassembly Main frame / Covers / Upper thread guide Thread tension L assy 1. Remove the two screws (screw, bind M4x6) to remove the thread tension L assy. 2. Remove the screw (screw, bind M3x4) to remove the washer plain S 4.2, the spacer 3x2.5 and the thread tension lever from the thread tension base.
  • Page 24 Disassembly Main frame / Covers / Upper thread guide 4. Remove the screw (bolt, socket M3x12). Loosen the nut 1 M4 to remove the tension dial. (four locations) Bolt, Socket M3X12 Tension dial (yellow) Tension dial (green) Nut 1 M4 Tension dial (pink) Tension dial (blue) Nut 1 M4...
  • Page 25 Disassembly Main frame / Covers / Upper thread guide <For thread tension dial yellow, pink, green> 5. Remove the nut 1 M4 to remove the tension disc A, the tension release disc B and the spring (X77414) from the thread tension shaft. *Assembling note •...
  • Page 26 Disassembly Main frame / Covers / Upper thread guide <For thread tension dial blue> 8. Remove the nut 1 M4 to remove the tension disc A, the tension release disc B, the thread tension spring S (XB0817) and the spring (X77414) from the thread tension shaft. *Assembling note •...

  • Page 27: Looper Thread Take-Up

    Disassembly Main frame / Covers / Upper thread guide Looper thread take-up 1. Remove the screw (screw, bind M4x20) to remove the washer spring 2-4, the looper thread take-up B, the looper thread take-up A and the looper take-up stand. *Assembling note •...

  • Page 28: Oil Pan

    Disassembly Main frame / Covers / Upper thread guide Oil pan 1. Remove the four screws (set screw) to remove the oil pan. 2. Remove the four cushions C from the oil pan. Cushion C Set screw Oil pan Cushion C Set screw Cushion C Set screw...
  • Page 29 Disassembly Lamp / Electrical parts / Main motor unit Lamp / Electrical parts / Main motor unit location diagram 2 - 18...
  • Page 30 Disassembly Lamp / Electrical parts / Main motor unit LED assy / Motor L assy 1. Cut the band 1M. Remove the screw (screw, bind M4x8) to remove the lamp holder. 2. Remove the lamp holder from the LED assy. Screw, Bind M4X8 Lamp holder LED assy...

  • Page 31: Lamp / Electrical Parts / Main Motor Unit

    Disassembly Lamp / Electrical parts / Main motor unit 3. Remove the two screws (bolt) to remove the two washers, the two washers and the motor L assy. *Assembling note • Fully tighten the screw after performing "Motor position adjustment". 4.

  • Page 32: Presser Foot Unit

    Disassembly Presser foot unit Presser foot unit location diagram 2 - 21...

  • Page 33: Presser Foot Adjusting Screw / Presser Foot Holder Assy / Presser Bar

    Disassembly Presser foot unit Presser foot adjusting screw / Presser foot holder assy / Presser bar 1. Remove the presser foot adjusting screw to remove the presser bar spring from the presser bar. 2. Remove the screw (set screw) to remove the presser foot holder assy. 3.

  • Page 34: Presser Lifter Shaft Assy

    Disassembly Presser foot unit Presser lifter shaft assy 1. Remove the two screws (screw, bind M4x6) to remove the two washer plains L4 and the presser lifter shaft assy. 2. Remove the retaining ring E4 from the presser lifter shaft assy. 3.
  • Page 35 Disassembly Upper blade / Lower blade / Looper Upper blade / Lower blade / Looper location diagram 2 - 24...

  • Page 36: Upper Blade / Lower Blade / Looper

    Disassembly Upper blade / Lower blade / Looper Needle plate assy / Stitch width dial assy 1. Remove the screw (screw, flat SM4.37-40x8) to remove the needle plate assy. 2. Remove the screw (screw, bind M2x4) to remove the fixed needle guard from the needle plate assy. *Assembling note •...

  • Page 37: Upper Knife Holder

    Disassembly Upper blade / Lower blade / Looper Upper knife holder 1. Remove the screw (screw, bind M4x8) to remove the washer spring 2-4, the knife release assy and the upper knife from the upper knife holder. *Assembling note • Fully tighten the screw after performing "Lower knife / Upper knife position adjustment".

  • Page 38: Lower Knife Holder Assy

    Disassembly Upper blade / Lower blade / Looper Lower knife holder assy 1. Remove the screw (screw, bind M4x6) to remove the lower knife from the lower knife holder assy. *Assembling note • Fully tighten the screw after performing "Lower knife / Upper knife position adjustment".

  • Page 39: Over Looper L Assy

    Disassembly Upper blade / Lower blade / Looper Over looper L assy 1. Remove the screw (set screw, socket (CP) M4x4). Pull out the OL shaft from the O.L shaft and the OL lever. Pull out the O.L shaft from the OL shaft guide. *Assembling note •...

  • Page 40: Lower Looper / Movable Needle Guard

    Disassembly Upper blade / Lower blade / Looper Lower looper / Movable needle guard 1. Remove the screw (screw, bind M3x6) to remove the UL threader and the lower looper from the UL lever. *Assembling note • Fully tighten the screw after performing "Lower looper position adjustment".

  • Page 41: Ul Lever

    Disassembly Upper blade / Lower blade / Looper UL lever 1. Remove the screw (set screw, socket (CP) M4x4) from the UL link. Remove the screw (set screw, socket (CP) M4x4) from the arm bed. Remove the UL lever. *Assembling note •...

  • Page 42: Upper Knife Plate Assy

    Disassembly Upper blade / Lower blade / Looper Upper knife plate assy 1. Remove the stopper screw to remove the upper knife link from the feed eccentric wheel. 2. Remove the screw (set screw, socket (CP) M4x4) to pull out the driving lever arm shaft. 3.

  • Page 43: Upper Knife Lever / Upper Knife Arm / Feed Adjusting Cam

    Disassembly Upper blade / Lower blade / Looper Upper knife lever / Upper knife arm / Feed adjusting cam 1. Remove the screw (set screw, socket (CP) M4x4) from arm bed. Pull out the upper knife lever shaft to remove the upper knife lever. 2.

  • Page 44: Ol Link Plate / Ol Lever

    Disassembly Upper blade / Lower blade / Looper OL link plate / OL lever 1. Remove the two screws (screw, bind M4x4) to remove the OL link plate from the two OL links. *Assembling note • Fully tighten the screw after performing "Over looper position adjustment".

  • Page 45: Ol Eccentricity / Ul Rod / Ul Eccentricity

    Disassembly Upper blade / Lower blade / Looper OL eccentricity / UL rod / UL eccentricity 1. Remove the two screws (set screw, socket (CP) M4x4) to remove the OL eccentricity from the looper driving shaft. *Assembling note • Fully tighten the screw after performing "Over looper timing adjustment".
  • Page 46 Disassembly Feed mechanism Feed mechanism location diagram 2 - 35...

  • Page 47: Feed Mechanism

    Disassembly Feed mechanism Differential adjusting plate 1. Remove the screw (screw, bind M4x6) to remove the differential adjusting lever. 2. Remove the screw (set screw, socket (CP) M4x4) to pull out the upper knife link shaft from the arm bed and the differential adjusting plate.

  • Page 48: Feed Bar Assy

    Disassembly Feed mechanism Feed bar assy 1. Remove the feed spring from the main feed dog and the arm bed. 2. Remove the screw (screw, bind M4x6) to remove the feed bar stopper plate B. *Assembling note • Check that the feed bar assy is not a wobble, and it moves smoothly. Screw, Bind M4X6 Feed bar assy Main feed dog...
  • Page 49 Disassembly Feed mechanism 3. Remove the screw (set screw, socket (CP) M4x4) from the arm bed. Remove the retaining ring E5 from the feed bar lever shaft. Pull out the feed bar lever shaft to remove the feed bar assy. *Assembling note •...
  • Page 50 Disassembly Feed mechanism 4. Remove the screw (set screw, socket (CP) M4x4) to pull out the adjusting link shaft from the differential feed adjusting and the differential feed link. *Assembling note • Fully tighten the screw after performing "Differential adjusting plate".
  • Page 51 Disassembly Feed mechanism 9. Pull out the link shaft to disassemble the main feed bar and the differential feed bar assy. Remove the retaining ring E4 (BK) and the washer plain S5 from the link shaft. 10.Remove the two screws (bolt, socket M3x6) to remove the main feed dog from the main feed bar. *Assembling note •...

  • Page 52: Feed Rod

    Disassembly Feed mechanism Feed rod 1. Pull out the feed adjusting block shaft from the feed rod and the feed adjusting block. 2. Remove the feed adjusting block from the feed adjusting lever. 3. Remove the two screws (set screw, socket (FT) M4x4) to remove the feed eccentric wheel. *Assembling note •...

  • Page 53: Feed Dial

    Disassembly Feed mechanism Feed dial 1. Remove the screw (screw, bind M4x6) to remove the adjusting dial spring. 2. Remove the feed dial lid from the feed dial. 3. Remove the screw (set screw, socket (CP) M4x4) to remove the feed dial and the driving lever arm shaft.

  • Page 54: Driving Mechanism

    Disassembly Driving mechanism Driving mechanism location diagram 2 - 43...

  • Page 55: Hand Wheel Assy

    Disassembly Driving mechanism Hand wheel assy 1. Remove the screw (screw, bind M3x6) to remove the washer plain L4. 2. Remove the four screws (screw, bind M4x6) to remove the two bushing stoppers. 3. Remove the hand wheel assy from the mounting positions, and pull out it from the needle bar rod. *Assembling note •...
  • Page 56 Disassembly Driving mechanism 4. Remove the crank shaft bushing from the driving shaft. 5. Remove the screw (screw, pan M4x10) to remove the balance L from the driving shaft. 6. Remove the two screws (set screw, socket (FT) M4x4) to remove the needle bar eccentric wheel from the driving shaft.

  • Page 57: Spiral Bevel Gears L / Looper Driving Shaft

    Disassembly Driving mechanism Spiral bevel gears L / Looper driving shaft 1. Remove the two screws (set screw, socket (FT) M4x4) to remove the spiral bevel gears L from the looper driving shaft. *Assembling note • Check that the end face of the looper driving shaft is contact to the end face of the spiral bevel gears L. •...

  • Page 58: Feed Adjusting Lever / Differential Adjusting Lever / Differential Dial Stand Assy

    Disassembly Driving mechanism Feed adjusting lever / Differential adjusting lever / Differential dial stand assy 1. Remove the two screws (set screw, socket (CP) M4x4) to remove the feed adjusting lever from the feed adjusting lever shaft. Set Screw, Socket (CP) M4X4 Feed adjusting lever shaft Feed adjusting lever Set screw, socket (CP) M4x4...
  • Page 59 Disassembly Driving mechanism 2. Pull out the feed adjusting lever shaft to remove the differential adjusting lever. 3. Remove the retaining ring E5 from the feed adjusting lever shaft. 4. Pull out the pin spring roll AW2 to remove the feed adjusting gears from the feed adjusting lever shaft. 5.
  • Page 60 Disassembly Needle bar Needle bar location diagram 2 - 49...

  • Page 61: Needle Bar

    Disassembly Needle bar Needle bar 1. Remove the screw (screw, pan M3x10) to remove the washer plain S3 and the needle clamp base from the needle bar. 2. Remove the two screws (screw, bind M3x6) to remove the needle clamp plate from the needle clamp base.
  • Page 62 Disassembly Needle bar 5. Pull out the needle bar connecting stud from the needle bar connecting link. 6. Remove the screw (set screw, socket (CP) M4x4) to pull out the needle bar rod shaft assy from the needle bar driving lever. 7.

  • Page 63: Needle Bar Driving Lever Assy

    Disassembly Needle bar Needle bar driving lever assy 1. Remove the two screws (screw, bind M4x16) to remove the needle bar driving lever assy. Screw, bind M4x16 Needle bar driving lever assy Screw, bind M4x16 Needle bar driving lever assy Screw, Bind M4X16 Fig.
  • Page 64 Disassembly Needle bar 2. Remove the retaining ring E6 (BK) from the needle bar shaft. Pull out the needle bar shaft from the washer plain S8, the needle bar driving lever and the washer plain S8. Remove the retaining ring E6 from the needle bar shaft.

  • Page 65: Adjustment

    Adjustment Presser bar height adjustment ......3 - 2 Needle bar height adjustment .......3 - 3 Needle bar balance position adjustment ....3 - 4 Lower looper position adjustment ......3 - 5 Lower looper timing adjustment ......3 - 6 Front / back position of lower looper adjustment ..3 - 7 Movable needle guard position adjustment ..3 - 8 Fixed needle guard position adjustment ....3 - 9 Over looper position adjustment ......3 - 10...

  • Page 66: Presser Bar Height Adjustment

    Adjustment Presser bar height adjustment 1. Put up the presser foot lever. 4. Fasten the screw (set screw, socket (CP) M4x8) for the presser bar bracket. Set screw, socket (CP) M4x8 Presser foot lever Presser bar bracket 2. Loosen the screw (set screw, socket (CP) M4x8) for the presser bar bracket.

  • Page 67: Needle Bar Height Adjustment

    Adjustment Needle bar height adjustment 1. Turn the pulley counterclockwise rotation, and 4. Fasten the screw (set screw, socket (CP) M4x8) then the needle bar is the highest position. for the needle bar connecting stud. Needle bar Set screw, socket (CP) connecting stud M4x8 Pulley...

  • Page 68: Needle Bar Balance Position Adjustment

    Adjustment Needle bar balance position adjustment 1. Turn the pulley counterclockwise rotation, and 3. Adjust the gap of the needle bar balance and the then the needle bar is the highest position. body to 3 mm. Presser foot lever Pulley Needle bar rod 3 mm...

  • Page 69: Lower Looper Position Adjustment

    Adjustment Lower looper position adjustment 1. Loosen the screw (screw, bind M3x6) for the 3. Set the gauge at the position of the figure, and then move the lever while turning the pulley lower looper. counterclockwise rotation, and then adjust the position of the tip of the gauge and the tip of the lower looper.

  • Page 70: Lower Looper Timing Adjustment

    Adjustment Lower looper timing adjustment 1. Put up the presser foot lever. 4. Set the gauge and the spacer at the position of the figure, and then attach the gauge with the screw (set screw 3.75x8). 5. Pull the spacer, and then turn the pulley Presser foot lever counterclockwise rotation, and then contact the needle clamp base.

  • Page 71: Front / Back Position Of Lower Looper Adjustment

    Adjustment Front / back position of lower looper adjustment 1. Turn the pulley counterclockwise rotation, and 2. Loosen the screw (set screw, socket (CP) M4x4) then set the needle and the lower looper at the for the UL lever shaft assy. position of the figure.

  • Page 72: Movable Needle Guard Position Adjustment

    Adjustment Movable needle guard position adjustment 1. Turn the pulley counterclockwise rotation, and 2. Loosen the two screws (screw, pan M3x4) for then set the needle and the movable needle the movable needle guard. guard at the position of the figure. Movable needle guard Pulley Screw, pan...

  • Page 73: Fixed Needle Guard Position Adjustment

    Adjustment Fixed needle guard position adjustment 1. Turn the pulley counterclockwise rotation, and 3. Move the fixed needle guard, and then adjust the then set the needle at the position of the figure. gap of the needle to 0 to 0.05 mm. Pulley Needle (left) Needle plate...

  • Page 74: Over Looper Position Adjustment

    Adjustment Over looper position adjustment 1. Turn the pulley counterclockwise rotation, and 3. Set the gauge at the position of the figure. then the over looper is the most left position. 4. Move the over looper, and then adjust the tip of the over looper to the position of contacting with the gauge.

  • Page 75: Over Looper Timing Adjustment

    Adjustment Over looper timing adjustment 1. Loosen the screw (set screw, socket (CP) M4x4) 3. Fasten the adjusting screw (set screw, socket for the OL eccentricity. (CP) M4x4) for the OL eccentricity. OL eccentricity Set screw, socket (CP) M4x4 Set screw, socket (CP) M4x4 OL eccentricity 2.

  • Page 76: Over Looper / Lower Looper Gap Adjustment

    Adjustment Over looper / lower looper gap adjustment 1. Turn the pulley counterclockwise rotation, and 3. Adjust the gap between the over looper and the then set the over looper and the lower looper at lower looper to 0 to 0.05 mm. the position of the figure.

  • Page 77: Feed Dog Height Adjustment (1)

    [When operated disassembly, Adjustment Feed dog height adjustment (1) assembly, and exchange] 1. Turn the differential dial to [1], and then turn the 6. Fasten the two screws (bolt, socket M3x8) for feed adjusting dial to [3]. the differential feed dog. Bolt, socket M3x8 Feed adjusting dial Needle plate...

  • Page 78: Feed Dog Height Adjustment (2)

    [When did not operate disassembly, Adjustment Feed dog height adjustment (2) assembly, and exchange] 1. Turn the differential dial to [1], and then turn the 5. Set the gauge at the position of the figure, and feed adjusting dial to [3]. then turn the upper knife adjusting shaft, and then adjust the differential feed dog to the position of contacting with the gauge.

  • Page 79: Feed Timing Adjustment

    Adjustment Feed timing adjustment 1. Loosen the two screws (set screw, socket (FT) M4x4) for the feed eccentric wheel, and then remove the screw (rear side). Feed eccentric wheel Set screw, socket (FT) M4x4 Set screw, socket (FT) M4x4 (Rear side) 2.

  • Page 80: Thread Tension Adjustment

    Adjustment Thread tension adjustment 1. Install the thread tension adjusting plate into the 2. Adjust the thread tension to 30g, when the scale gap of the right side of the thread tension dial, of the thread tension assy L is [4]. and then attach the notch of the thread tension 3.

  • Page 81: Thread Tension Release Adjustment

    Adjustment Thread tension release adjustment 1. Turn the all thread tension dials to [9], 3. Shift the thread tension release cam in the direction of the arrow to abut the thread tension lever to the thread tension release. Thread tension release Thread tension dial Thread tension Thread tension...

  • Page 82: Stitch Width Dial Adjustment

    Adjustment Stitch width dial adjustment 1. Loosen the screw (screw, bind M4x6) for the 4. Move the lower knife holder, and then from the stitch width dial. center of the needle (left) to the right side end of the lower knife to 4.8 to 5.2 mm. Stitch width dial Needle (left) Upper knife...

  • Page 83: Lower Knife / Upper Knife Position Adjustment

    Adjustment Lower knife / Upper knife position adjustment Lower knife Upper knife 1. Loosen the screw (screw, bind M4x6) for the 1. Turn the pulley counterclockwise rotation, and lower knife. then the upper knife is the lowest position. Pulley Screw, bind M4x6 Upper knife 2.

  • Page 84: Motor Position Adjustment

    Adjustment Motor position adjustment 1. Loosen the two screws (bolt 7.14) for the motor 3. Fasten the two screws (bolt 7.14) for the motor holder. holder. Motor holder Bolt 7.14 Bolt 7.14 *Key point 2. Move the motor holder, and then adjust the •...

  • Page 85: Looper Take-Up Position Adjustment

    Adjustment Looper take-up position adjustment 1. Turn the pulley counterclockwise rotation, and 3. Adjust the position of from the extension of the then the over looper assy is the lowest position. thread guide #8 to the right side of the looper ...

  • Page 86: Thread Take-Up Position Adjustment

    Adjustment Thread take-up position adjustment 1. Remove the thread take-up cover. 4. Move the thread take-up, and then adjust the position so that the hanging condition of the 2. Turn the pulley counterclockwise rotation, and needle thread which hangs the needle thread then the needle bar is the lowest position.
  • Page 87 34KH15HF884B02/03...

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