Brother LT2-841 MKII User manual

LT2−B841 Mark II, B842 Mark II 1/9
2000.7
LT2−B841Mark II
Twin Needle Needle Feed Lock Stitcher
Twin Needle Needle Feed Lock Stitcher
with Thread Trimmer
Specifications −1−3−5
Application Forthinmaterials Formediummaterials Forheavymaterials
Max.speed 4,000rpm 3,000rpm
Max..stitchlength 4mm 5mm
Needlebarstroke 33.4mm
Threadtake-upstroke 52mm
Manual 7mmHeightof
Presserfoot Knee 13mm
Heightoffeeddog 1mm
Needle DP×5#11 DP×5#14 DP×5#22
Hook Horizontalrotaryhook(verticalaxis)

LT2−B841 Mark II, B842 Mark II 2/9
2000.7
LT2−B842Mark II
Twin Needle Needle Feed Lock Stitcher
Twin Needle Needle Feed Lock Stitcher
with Thread Trimmer
Specifications −1 *−1C −3−5
Application Forthinmaterials Formediummaterials Forheavymaterials
Max.speed 4,000rpm 3,000rpm
Max..stitchlength 4mm 5mm
Needlebarstroke 33.4mm
Threadtake-upstroke 52mm 52mm (Withthreadtrimmer)
Manual 7mm
Knee 13mm(Withthreadwiper:10mm)
Heightof
presserfoot Auto Solenoidtype:8 mm,Airtype:10mm
Heightoffeeddog 1mm
Needle DP×5#11 DP×5#14 DP×5#22
Hook Horizontalrotaryhook(verticalaxis)
−400 −700 −900
Threadtrimmer Scissorstype(Solenoid)
Threadwiper Solenoidtype
Quickreverse Solenoidtype
Automaticpresserbarlifter −Airtype Solenoidtype

LT2−B841 Mark II, B842 Mark II 3/9
2000.7
B841 Mark II ·B842 Mark II (For Standard)
For normal
*In case of using over 1−1/2" (38.1mm) gauge parts, it is required to make special machining on the arm-bed.
A maximum stitch width specification of 77 mm is available.
Please consult your Brother representative concerning delivery date and price.
Needlegauge Needleclamp
assy Needleplate Feeddog Presserfootassy
(−3) (−5) (−3,−5) (−7)
(inch) (mm) Formedium materials Forheavy materials Formedium&
heavymaterials
Forextraheavy
materials
(Fingerguardless)
(Withfingerguard)
Tandem (0.5) 158801−001 142111−001 142110−001 142105−001
1/16 (1.6) 158808−001 142111−001 151078−001 151076−001
1/8(3.2) 158794−101 114950−001 117369−001 114951−001 158430−001 114948−001 S36544−001 ¡
5/32 (4.0) 158796−101 116503−001 150850−001 116509−001 116502−001
3/16 (4.8) 158791−101 112603−001 117133−001 112659−001 S13588−001 112638−001 S36546−001 ¡
1/4
(6.4)
158792−101 112604−001 117367−001 112660−001 153882−001 112642−001 S36548−001 ¡
5/16 (7.9) 158793−101 112605−001 144882−001 112661−001 112645−001
3/8(9.5) 158798−101 116506−101 144881−101 116510−101 153887−001 116498−001
7/16
(11.1)
158809−101 151596−001 151598−001 151597−101 ¡
1/2(12.7) 158797−101 116505−001 S09365−001 116511−001 153892−001 116499−101 ¡
5/8(15.9) 158795−101 116507−001 159577−001 116512−001 153897−001 116500−101 ¡
1(25.4) 158805−101 147176−001 147178−001 153907−001 147177−101 ¡
1−1/4(31.8) 158799−101 116504−001 116508−001 116501−101 ¡
1−1/2(38.1) 158800−101 118945−001 118947−001 118946−101 ¡
2(50.8) 158802−101 144951−001 144947−001 144949−101 ¡
2−1/6
(55.0)
155803−101 147560−001 147561−001 147562−101 ¡
75mm S16238−101 S16240−001 S16241−001 S16242−101 ¡
77mm S30508−001 S30510−001 S30513−001 S30511−201 ¡
Needleplate
Needleclampassy (−3)
Formediummaterials (−5) Forheavymaterials
Feeddog Presserfootassy
(−3,−5)
Formedium&heavymaterials (−7) Forextraheavymaterials (Fingerguardless) (Withfingerguard)

LT2−B841 Mark II, B842 Mark II 4/9
2000.7
B841 Mark II ·B842 Mark II (For Standard)
For foundation
*The needle plate and the feed dog aredifferent from normal parts.
*Use part no. 117160−001 as the needle plate installation screw.
Needlegauge Needle clamp assy Needleplate Feeddog Presserfootassy Presserfootassy
(inch)
(mm)
(Fingerguardless) (Withfingerguard)
1/8(3.2)
158794−101
S24571−001
S24572−001
114948−001
S36544−001
¡
Barless
117370−001
117366−001
3/16
(4.8) 158791−101 117158−001 117134−001 112638−001 S36546−001 ¡
1/4(6.4)
158792−101
117368−001
117365−001
112642−001
S36548−001
¡
5/16 (7.9)
158793−101
S31907−001
S31908−001
112645−001
Needleplate Feeddog
For sewing without material
*The needle plate, the feed dog and the presser foot assembly are different from normal parts.
*Use gauge components of for sewing without material which have a maximum feed pitch of 4mm or less.
Needlegauge
Needleclampassy
Needleplate Feeddog Presserfootassy
(inch)
(mm)
3/16 (4.8)
158791−101
S36010−101
S36011−101
S36012−001
1/4
(6.4)
158792−101 S36025−001 S36024−001 S36022−001
Needleplate Feeddog Presserfootassy

LT2−B841 Mark II, B842 Mark II 5/9
2000.7
( − 1) : For light materials
*The feed dog is different from normal parts.
Needlegauge Needleclampassy Needleplate Feeddog Presserfootassy Presserfootassy
(inch)
(mm)
(Fingerguardless) (WithFingerguard)
1/8(3.2) 158794−101 114950−001 S07880−001 114948−001 S36544−001 ¡
3/16 (4.8)
158791−101
112603−001
S07878−001
112638−001
S36546−001
¡
1/4(6.4)
158792−101
112604−001
S07879−001
112642−001
S36548−001
¡
Feeddog
(−6) : For heavy materials
*-6 (for heavy materials) is a specification between –5 (for heavy materials) and –7 (for extra heavy materials).
*The feed dog is different from normal parts.
Needlegauge Needle clamp assy Needleplate Feeddog Presserfootassy Presserfootassy
(inch)
(mm)
(Fingerguardless) (WithFingerguard)
3/16 (4.8)
158791−101
117133−001
S21149−001
112638−001
S36546−001
¡
1/4(6.4)
158792−101
117367−001
S21150−001
112642−001
S36548−001
¡
Feeddog

LT2−B841 Mark II, B842 Mark II 6/9
2000.7
For new synthetic fiber
*The shape of the presser foot assembly is the same as for the standard part, but it has a special surface processing.
*The feed dog and the presser foot assembly are different from normal parts.
Needlegauge Needle clamp assy Needleplate Feeddog Presserfootassy
(inch)
(mm)
(Fingerguardless)
3/16 (4.8)
158791−101
112603−001
S36832−001
S36833−001
1/4(6.4) 158792−101 112604−001 S36829−001 S36830−001
Feeddog Presserfootassy
(Finger guard less)
Option parts
*The presser foot assembly is different from normal parts.
*The presser foot assembly with guide should be used with a maximum feed pitch of 4mm or less.
Nameofparts Needlegauge Presserfootassy
(inch)
(mm)
1/8
(3.2)
149311−001
Presserfootassywithguide 3/16 (4.8)
117281−001
1/4(6.4)
149312−001
Presserfootassywithguide,L 5/16 (7.9) S13735−001
Presserfootassyforattachzipper(Right) 1/8(3.2) S14080−001
Presserfootassyforattachzipper(Left) 1/8(3.2) S33459−001
Presserfootassywithguide Presserfootassywithguide,L Presserfootassyforattachzipper
(Right) Presserfootassyforattachzipper (Left)

LT2−B841 Mark II, B842 Mark II 7/9
2000.7
B842 Mark II (For Thread trimmer)
For normal
*The thread trimming fixed knife (part No. S07527−001) and the installation screw (part No. 148539−101) are not provided with the
needle plate, so they must be ordered separately if required.
*In case of using over 1−1/2" (38.1mm) gauge parts, it is required to make special machining on the arm-bed.
A maximum stitch width specification of 2" (50.8mm) is available.
Please consult your Brother representative concerning delivery date and price.
*The ¡symbol is a presser foot assembly with finger guard.
Needlegauge Needleclamp Needleplate Feeddog Presserfootassy
assy
(−3)
(−5)
(−3)
(−5)
(−3)
(−5)
(inch) (mm) Formedium
materials Forheavy materials Formedium materials Forheavy materials
Formediummaterials
Forheavymaterials
2mm
S19862−001
S19864−001
S19866−001
S19867−001
3/32
(2.4)
158804−101 159398−001 148697−001 148679−001
2.8mm
S19905−001
S19907−001
S19909−001
S19910−001
1/8(3.2)
158794−101
159400−001
155722−001
148698−001
148699−001
148685−001
148681−001
S36550−001
¡
S36552−001
¡
5/32 (4.0)
158796−101
158785−001
155724−001
148700−001
148701−001
148689−001
148683−001
3/16 (4.8)
158791−101
158784−001
155851−001
148702−001
148703−001
148687−001
148691−001
S36554−001
¡
S36556−001
¡
1/4(6.4)
158792−101
158783−001
155853−001
148704−001
148705−001
148693−001
148695−001
S36558−001 ¡S36560−001 ¡
5/16
(7.9)
158793−101 159402−001 155855−001 149692−001 149691−001 149689−001 149687−001
3/8(9.5)
158798−101
149946−001
155857−001
149939−001
149938−001
149942−001
149940−001
1/2(12.7)
158797−101
159404−001
149677−001
149676−001
149675−001
149673−101
¡
149671−101
¡
5/8
(15.9)
158795−101 149956−001 149954−001 149949−001 149948−001 149952−101 ¡149950−101 ¡
3/4(19.1)
158806−101
150526−001
150523−001
150524−101
¡
7/8(22.2)
158807−101
150534−001
150531−001
150532−101
¡
1
(25.4)
158805−101 S32052−001 149966−001 S32055−101 149960−001 S32055−101 ¡149962−101 ¡
1−1/8
(28.6)
S16102−001
S16104−001
S16107−101
S16107−101
¡
1−1/2
(38.1)
158800−101
S07391−001
S07390−001
S07388−101
¡

LT2−B841 Mark II, B842 Mark II 8/9
2000.7
B842 Mark II (For Thread trimmer)
For normal
Needleplate
Needleclampassy (−3)
Formediummaterials (−5) Forheavymaterials
Feeddog Presserfootassy
(−3)
Formediummaterials (−5) Forheavymaterials (−3) Formediummaterials (−5) Forheavymaterials
For sewing without material
*The needle plate, the feed dog and the presser foot assembly are different from normal parts.
*Use gauge components of for sewing without material which have a maximum feed pitch of 4mm or less.
Needlegauge Needleclampassy Needleplate Feeddog Presserfootassy
(inch)
(mm)
3/16 (4.8)
158791−101
S20901−001
S20905−001
S20903−001
1/4 (6.4)
158792−101
S10507−001
S10509−101
S10510−001
7/8 (22.2) 158807−101 S14538−001 S14540−001 S14541−101 ¡
1(25.4)
158805−101
S14543−001
S14545−001
S14546−101
¡
Needleplate Feeddog Presserfootassy

LT2−B841 Mark II, B842 Mark II 9/9
2000.7
(−6) : For heavy materials
*-6 (for heavy materials) is a specification between –5 (for heavy materials) and –7 (for extra heavy materials).
*The feed dog is different from normal parts.
Needlegauge Needle clamp assy Needleplate Feeddog Presserfootassy Presserfootassy
(inch)
(mm)
(Fingerguardless) (Withfingerguard)
3/16 (4.8)
158791−101
155851−001
S07905−001
148691−001
S36556−001
¡
1/4(6.4)
158792−101
155853−001
158756−001
148695−001
S36560−001
¡
Feeddog
For new synthetic fiber
*The feed dog and the presser foot assembly are different from normal parts.
*The shape of the presser foot assembly is the same as for the standard part, but it has a special surface processing.
Needlegauge Needle clamp assy Needleplate Feeddog Presserfootassy
(inch)
(mm)
(Fingerguardless)
3/16 (4.8)
158791−101
158784−001
S36855−001
S36856−001
1/4(6.4)
158792−101
158783−001
S36858−001
S36859−001
Feeddog Presserfootassy
(Fingerguardless)