Singer 371U Manual

Notes for using this parts book

I.This book is applicable to sewing machines which have the plate number as shown on the cover of this book (or correction sheet).

2.If the symbol!._______,I or I000000-0-00I is in the "Parts No." column or the "Assembly No." column, please refer to the different parts list (page 27).

3.The symbol I~Iin the "Parts No." column indicates that the parts is not available for supply. If, however, there is a number in the "Assembly No."column, the parts can be ordered as an assembly. Please, therefore, order by using the assembly number.

4.This book was prepared based on information available in May, 1983.

5.Parts are subject to changes in design without prior notice.

From the library of: Superior Sewing Machine & Supply LLC

CONTENTS

A.	Machine body (I) ..............................................................................			.
A.	Machine body (2) ...............................................................................				2
B.	Needle bar and thread take-up mechanism ........................................				3
C.	Upper shaft mechanism .... ......... .............................	............................			4
D.	Zigzag mechanism (I ) ...........................	...........................	..............	.....	5
D.	Zigzag mechanism (2) ...............................	..........................	................		6
E.	Clutch mechanism ..................... ...................	...... ................................			7
F.	Power transmitter mechanism .. ...... ..............	....... .. .............................			8
G0	Belt shift mechanism ........ ......... ..............	............ ....................	...........		8
H0	Emergency stop mechanism ...............................................................				9
J 0	Tension pully mechanism ...................................................................				9
Ko	Presser foot mechanism ...........................	........................	...............	....	I0
Lo	Feed mechanism (I) .............................	...........................	...............	....	I0
Lo	Feed mechanism (2) ............ .................	...... ........................	.............	...	II
Lo	Feed mechanism (3) ...........................................................................				12
M.	Feed cam mechanism ...........................	...........................	...............	....	I3
N.	Thread breakage detector .........................	..............................	........	....	13
P.	Cutter mechanism ....................................	.......................	................	...	14
Q.	Gimp Guide mechanism ................................................................			~....	15
Ro	Tape winder mechanism .....................................................................				16
S.	Vertical shaft and Lower shaft mechanism ................ ........................				17
T.	Lubrication (I) ...................................................................................				18
T.	Lubrication (2) ...................................................................................				19
U.	Threading mechanism (I) .... ..... ..... ..... ...	...... ....... ... ........ ................	.....		20
U.	Threading mechanism (2) ....................	0..............................................			21
V.	Bobbin winder ..........................................	.......................	...................		21
W0 Upper Thread Trimmer mechanism (I)		..............................................			22
W.	Upper Thread Trimmer mechanism (2)	............ ~..............	•..................		23
X.	Lower Thread Trimmer mechanism ...................................................				24
Z.	Accessories mechanism (I) ...................	............................	..............	....	25
Z.	Accessories mechanism (2) .....................................	............................			26
DIFFERENT PARTS LIST .....................................................................					27
GAUGE PARTS LIST .............................................................................					35
MOTOR PULLEY AND BELTS .............................................................					37
INDEX ......................................................................................................					38

From the library of: Superior Sewing Machine & Supply LLC

m

Zigzag mechanism (I)

D.

35

~

Ref. No.					Name of Parts		Q'ty	Parts No.	Assembly No.	Ref. No.		Name of Parts			Q'ty		Parts No.			Assembly No.
1		Speed		Reduction Gear			1	141309..001		11-2-3	Screw 4.37				1		104908.002			D-11 Zigzag
2		Screw 6.35 x 6					2	014770-622		11-24	Zigzag	Adjusting	Ring		1
																				Adjusting Cam
3		Sub	Shaft				1	141310..001		11-2-5	Zigzag	Adjusting	Ring	Connector	1					Assembly
																			147901..001
4		Sub	Shaft		Bushing	(Left)	1	141311..000		11-3	Pin				1		141326..001
																	----
6		Sub	Shaft		Bushing	(Right)	1	141312..000		14	Zigzag	Adjusting	Link	Shaft	1		141328..001
																	----
8		Sub	Shaft Gear				1	141313..001		15	Screw 4.37 x 7				2		009680.712
9		Screw 6.35 x 6					2	014770-622		16	Zigzag Adjusting		Link		1		141329.001
10.1		Collar					1	~	D-10	17	Washer				1		102707-002
									CoUar Assembly	18	Screw	3.57 x 6			1		009670-612
10.2		Screw 5.95					2	151604 o01	181994..001
										35	Screw	7.94			1		141344.001
11-1		Zigzag Cam					1		D-11 Zigz~	37	Nut 7.94				2		403388..002
11-2-1		Zigzag		Adjustint Bracket			1		Adjusting am
									Assembly
11-2-2		Zigzag		Adjusting Shaft			1	----	147901.(}01
NOTE!		PREFIX ALL NUMBERS BY 'BR,.]

[ EXAMPLE BR009681-Q-14

- 5-

From the library of: Superior Sewing Machine & Supply LLC

D. Zigzag mechanism (2)

2

23

47

44

··--0

.42

57

34

33

32

49

r--------		,
1-4	~59	I
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Ref. No.		Name of Parts					Q'ty	Parts No.	Assembly No.	Ref. No.			Name of Parts			Q'ty			Parts No.		Assembly No.
19		Pin					1	141332-001		43		Zigzag	Position Changing Lever			1		141354..()00
20		Nut 5.95					1	106588..()03		44		Screw				1		141355-001
21		Spring					1	141333..001		45		Nut 7.94				1		105812..003
22		Spring Hook					1	141334..001		46		Screw				1		141356..001
23		Zigzag Adjusting	Lever				1	141335-000		47		Nut 7.94				1		105812.002
24		Screw					2	141336.001		48		Washer				1		158449.001
25		Pin					2	141337.001		49		Stopper				1		141357..000
26		Spring					2	141338-001		so		Screw 5.95 x 6				2		01476o.622
27		Screw					1	141339-001		51		Spring				1		141358-001
28		Nut 5.95					1	106588-003		52		Spring Hook				1		141334-001
29		Zigzag Adjusting	Lever		Shaft		1	141340.001		53		Zigzag	Connecting Shaft					141359.001
30		Screw 5.95					1	013760-612		54		CoUar				1		141351.001
31		Zigzag Eccentric	Shaft				1	141341.001		55		Screw	6.35 x 6			1		014770-622
32		Zigzag Eccentric	Shaft		Link		1	141342.000		56		Bar Tack Connecting Shaft				1		141659-001
33		Washer					1	149095-001		51		Spring				1		141363.001
34		Screw 5.95 x 12					1	009761-212		58		Stop Ring C11				1		048110.142
36		Screw 7.94					1	141345-001		59		Stud				1		145344-001
38		Zigzag Connecting		Rod			1	141346-001		60		Bushing (Right)						141716-000
39		Screw 4.76					1	100511-003		61		Bushing (Left)						141365-000
40		Zigzag Connecting		Lever		(A)	1	141347-001		62		CoUar						141366-001
41		Screw 4.76 x 14					1	009711412		64		Bushing				1		147155-000
42		Zigzag Connecting		Lever		(B)	1	141348-001

	[	NOTE! PREFIX ALL NUMBERS BY 'BR'.]
		EXAMPLE BR009681-0-14	- 6 -

From the library of: Superior Sewing Machine & Supply LLC

E. Clutch mechanism

Il-4 -[d		II
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86-1~ 66·2~

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	Ref. No.			Name of Parts				Q'ty			Parts No.	Assembly No.		Ref. No.							Name of Parts				Q'ty	Parts No.	Assembly No.
3-1			Stop Cam Segment		(B)			1		141547-001					34			Screw 5.95 x 10						2		009761-012
3-2			Stop Cam Segment		(B)			1			145442-o01		35					Outch			Lever Bracket			1		141557-002
4			Bolt 5.95 X 14					1		017761-412			36					Bolt 8 X 25						3		018082-522
	s		Outch Claw (A)					1		141548-001			37					Outch Lever Shaft						1		141558-001
6			Washer					1		118735-002			38					Screw 6.35 x 6						1		014770-622
7			Bolt 6.35 X 14					1		017781-412			39					Clutch			Return	Spring		1		141559-001
8			Emergency Stop Lever Shaft					1		141618-001			40					Adjusting Plate						1		115558-002
9			Stop Lever Spring					1		141549-001			41					Screw 4.76						1		115559-002
10			Spring Hook					2		141550-001			42					Screw 5.95 x 10						1		009761-012
11			Outch	Lever				1			146041-D02		43					Spring Hook						1		141334-001
12			Clutch	Claw (B)				1		141553-001			44					Outch Starting Lever						1		146955-D04
13			Washer					1		118735-002			45					Bolt 7.94						1		115585-001
14			Bolt 6.35 X 25					1		017782-512			46					Nut 7.94						1		152997-001
	IS		Clutch Stopper Stud					1		115542-001			48					Screw 4.76 x 14						2		009711-412
16			Washer 6					1		025060-332					so			autch			Starting	Lever	Spring	1		141562 001
17			Screw 5.95 x 12					1		009761-212			51-1					autch			Starting	Lift Lever		1		----	E-51
																											Starting Lift
18			Screw					1		115544-001			51-2					Outch			Starting	Lever	Shaft	1
																											Lever Assembly
19			Outch	Stopper				1		115545-001			51-4					Screw 6.35 x 6						1		014770 622	154499-001
20			Screw					1		115546-001			53					Stopper						1		141564-001
21			Washer	2-S				1		028050-240			54					Screw 5.95 x 12						2		009761-212
22			Nut 4.76					1		021710-202			56					Brake			Lever Assembly			1		142755-001
23			Stopper Bar					1		141554-001			58					Screw 7.14						1		141953-001
24			Spring (C)					1		147639-001			59					Brake			Lever Pin			1		142214.()01
25			Spring Felt					1		115550.001			60					Screw 5.95						1		151604-002
26			Spring (B)					1			11SSS1-001		61					Washer						1		107153-002
27			Washer	10				1		025100-132			62					Stop Ring E7						1		048070-342
	28		Nut 9.52					1		021860-202			63					Brake Spring						1		142771.001
	29		Bar Clamp					1		115552-001			64					Spring			Hook			1		141334.()01
	30		Washer	10				1		025100-132			65					Nut 9.52						1		100075 004
	31		Stop Ring C10					1		048100-142			66-1					Stop Lever						1			E-66
																											Stop Lever
	32		Clutch	Lever Pin				1		141555.001			66-2					Bushing						1		142372.()00----
																											Assembly
	33		Belt Shifter					1		141556-101			66-3					Bushing						1		142373-000	181708-001

NOTE! PREFIX ALL NUMBERS BY 'BR'.] [ EXAMPLE BR009681-0-14

-7-

From the library of: Superior Sewing Machine & Supply LLC

F. Power transmitter mechanism

G. Belt shift mechanism

Ref. No.		Name of Parts			Q'ty		Parts No.		Assembly No.
1		Transmitter	Base		1		147222..002
2		Bolt 8 x 25			3		----
							018082 522
3- 1		Transmitter	Shaft		1
3- 2		Slow Speed Pulley			1
3- 3		Bearing 6007VV			2
3- 4		Bearing Coller			1
3- 5		Bearing Cap			1
3-10		Bearing 6004VV			2		----		F-3
3- 6		Screw 3.18 x 8			4		003660 812
3- 7		Pulley			1		----		Transmitter
		Pulley			1				Assembly
3- 8									141566{101
3- 9		Screw 4.76 x 14			2		----
							009711 412
3-11		Bearing Cap			2
3-12		Screw 3.18 x 8			8		003660 812
3-13		Stop Ring C20			1		048200-142
4		Screw 6.35 x 10			2		013781..012
5		Oil Cap			1		111937..001

NOTE! PREFIX ALL NUMBERS BY 'BR'.] [ EXAMPLE BR009681·D-14

18 19

Ref. No.		Name of Parts		Q'ty			Parts No.		Assembly No.
1	Belt	Shifter	Bar		'1		141574..001
2	Belt	Shift Lever		1			141575.001
4	Bushing			2			142373.000
5	Bolt	7.94		1			115585.001
6	Nut	7.94		1			152997.001
7	Roller with Roller Stud Assembly			1			141576..001
8	Nut 5.56			1			021750.102
9	Belt	Shift Lever Pin		1			141579..001
10	Screw 6.35 x 6			1			01477o-622
11	Stopper Plate			1			141580{101
12	Screw 4.37 x 8			2			009680.812
13	Spring			1			141581.001
14	Spring Hook			1			141472.002
15	Belt Shifter Cam			1			141582.001
16	Screw 6.35			1			141583.001
17-1	Belt	Shifter	Bracket	1			~		G-17 Belt
									Shifter Bracket
17-2	Slide	Block		1			141586.001		Assembly
									141584-001
18	Belt	Shifter	Guide	2			141588..001
19	Screw 4.37 x 8			4			009680-812
20	Belt	Shifter		1			141589.001
21	Screw 4.76 x 10			2			009711..()12
22	Stop	Ring E7		1			048070.342
23	Spring			1			145931.001

- 8 -

From the library of: Superior Sewing Machine & Supply LLC

H. Emergency stop mechanism

J. Tension pully mechanism

1-7

1-

4 1

-s 1-

&

1-a

Ref. No.	Name of Parts			Q'ty			Parts No.	Assembly No.				Ref. No.					Name of Parts							Q'ty					Parts No.		Assembly No.
1	Emergency	Stop	Lever	1			141698.001					1- 1				Tension	Pulley							1			141622..()00
2	Screw 4.37			2			107407.003					1- 2				Bearing 6000DD								2			072600..()40
3	Spring			1			141699.001					1- 3				Collar								1			142342.000
4	Emergency	Stop	Supporter	1			141700.001					1- 4				Cap Plate								1			141316.001
5	Washer			1			141701.001					1- 5				Screw 3.18								4			110185.002
6	Screw			1			141702.001					1- 6				Tension	Pulley	Shaft						1			141623.001
7	Retainer Plate			1			141703.001					1- 7				Stop Ring E9								1			048090-342
8	Bolt 4.37 X 10			2			017681.012					1- 8				Tension	Pulley	Arm						1			141624.001
9	Emergency	Stop Joint		1			141704.001					1- 9				Tension	Pulley	Indicator						1			141625..()01				J-1
10	Washer 4.37			2			02568Q-232					1-10				Screw 3.57 x 6								2
																												00967Q-612			Tension Pulley
NOTE! PR~TX ALL mfMBERS BY •BR'. ]												1-11				Tension	Pulley	Lever						1			143917.001				Assembly
																															141621.001
												1-12				Washer								1			141627.001
[ EXAMPLE B~~~4-·												1-13				Screw 3.57 x 12								2			007671-212
												1-14				Tension	Pulley Pawl			~				1			141628-001
												1-15				Tension	Pulley	Pawl Shaft						1			141629..()01
												1-16				Spring								1			14163().()01
												1-17				Collar								1			141631..()01
												1-18				Stop Ring E3								2				04803Q-342
												1-19				Spring Pin AW2.S								2				04725o-842
												1-20				Tension	Lever							1			143914.001
												2				Screw 7.94								1			141632.001
												3				Tension	Pulley	Ratchet						1			141633..()01
												4				·screw 4.37 x 8								3			009680-812

-9-

From the library of: Superior Sewing Machine & Supply LLC

K. Presser foot mechanism

L. Feed mechanism (I)

5 --- (§>

r------------,

1-4

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1 7-N~~::;:~F-,~~

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Ref. No.			Name of Parts				Q'ty		Parts No.		Assembly No.
1		Presser	Bar				1		141449.001
2		Presser	Bar	Bracket			1		1414SQ-001
3		Screw 6.3S x 6					1		014170-622
4		Presser	Bar	Spring		(Large)	1		1414S1.()01
s		Washer					1		100281.()01
6		Screw			S		1		----		1414SS-Q01
									1414S4.()01
7-1-1		Presser	Bar	Roller		Bracket	1
7-1-2		Roller	7 x 17				1		1S6879.()01		K-7-1
7-1-3		Roller	Stud				1				Presser	Bar
7-1-4		Stop Ring		E6			1		048060 342		Roller Bracket
7-1-S		Screw 4.37 x					1		100366.()02		Assembly
7-1-6		Washer	3.5				1		---		K-7-2
									02S3SQ 332
7-1-7		Screw	3.S7 x S				1		00167Q-S12
7-2-1		Presser	Bar	Roller		Bracket	1
7-2-2		Roller	7 x 14				1		1S6880.()01
7-2-3		Roller	Stud				1				Presser	Bar
7-2-4		Stop Ring		E6			1		048060 342		Roller	Bracker
7-2-S		Screw 4.37 x S					1		100366.002		Assembly
									---		14S377-001
7-2-6		Washer	3.S				1		02S3S0-332
7-2-7		Screw	3.S7 x S				1		001670·S12
8		Screw 4.37 x 10					1		009681.()12

	[	NOTE! PREFIX ALL NUMBERS BY 'BR'. ]
		EXAMPLE	BR009681-0-14

r=2---------------~

I

I

47-1~	I		• _,_47-a-1·7 l
	I
	I
	I		47+1·3--ft ~47-a-r-s 47-a-1-1
	I		I	47-1-J-4~
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47·3·5------i			47-•-5-jl'	47-e-t-9~
	I
			~	47-1-1·5-'
47·3-4~	·I
47·3-3~	I		47-1-4~
			47-1·3~ .-47-17
	I
47-3-1 ~ %	I		~ ~47-a-s
	I		47-1·2~---'
	I		47-1-1·1~
	II
	I
_______________J
r~J--------------	~ ~		--~-------------	~
	I	-5
rr=ror:l3	I
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	I
	I
47-&·2----r ~	I
	I
47-&-5-.f&l	I
	I
47-&-c~	I
47-&-3-----l\	I
	I
	I
	I
	I
	I
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I	I
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L----------------.J

Ref. No.					Name of Parts							Q'ty		Parts No.		Assembly No.
47-	3-1		Upper Clamping				Foot		Rubber			1	144498.()01			L-47-3
47- 3-2			Upper	Clamping			Foot Supporter					1				Upper Clamping
													144496.()01			Rubber
47-	3-3		Pin									2
47- 3-4			Spring									2	107401.()01			Foot Assembly
													---			1S0764-o01
47- 3-S			Screw	1.98								2	107404-001
47- 6-1			Upper Clamping Foot Rubber									1	14463Q 001
47- 6-2			Upper Clamping				Foot		Supporter			1				L-47-6
47- 6-3			Pin									2	----144496 001			Upper Clamping
																Foot Assembly
47- 6-4			Rubber .Foot Presser						Plate Spring			2	144707..()01
																1S0768-001
47-	6-S		Screw	1.98								2	107404-001
47-	8-1-1		Upper Clamping Foot (2S-4)									1	----
													14S362.()01
47-	8-1-2		Upper Clamping				Foot		Supporter			1
47-	8-1-3		Pin									1	144496.()01
47-	8-1-4		Spring									1	107401-001
47·	8-1-S		Spring	Plate								1	14S36S-001
47-	8-1-6		Thread Presser									1	14S366-001			L-47·8
47-	8-1-7
			Screw	2.38								2	11110S.()01
																Upper Clamping
47-	8-1·8		Screw	1.98								1		107404.()01		Foot Assembly,
47- 8-1-9			Pin									1	146034..()01			2Smm
47- 8-2			Gimp	Fixed Knife								1	14S367-001			150170.()01
47· 8-3			Gimp Trimming				Knife					1	14S731.()01
47- 8-4			Gimp Trimming Crank									1	14S369-001
47- 8-S			Screw	3.S7								1	14S37Q-001
47- 8-6			Gimp	Detach Lever								1	14S373-001
47-	8-7		Screw	2.38								1	14S371.001
47-12-1			Upper Clamping				Foot		SO			1	----
													14723Q 001			L-47-12
47-12-2			Upper Clamping Foot Supporter SO									1				Upper Clamping
			Pin
47-12-3												2	144496 001			Foot Assembly,
																so
47-12-4			Spring									2	107401-001
																1S0766-001
47-12-5			Screw	1.98								2	107404-001

-10-

From the library of: Superior Sewing Machine & Supply LLC

L. Feed mechanism (2)

....

'-----,4·•·•

	Ref. No.					Name of Parts		Q'ty		Parts No.			Assembly No.			Ref. No.						Name of Parts						Q'ty			Parts No.					Assembly No.
	1-1			Feed Cam Shaft			Bracket	1		----		L-1			26-1					Feed		Lever	(B)					1		141422..001
	1-2			Feed Shaft				1				Feed Cam			27					Screw 5.95 x 10								2		009761..012
	1-3			Washer		12.70		1		025900.232		Shaft Assembly			28					Feed		Lever	Shaft					1		147945..001
	1-4			Nut	12.70			1		021910.302		141401.001			29					Stop		Ring	ES					1		048050.342
	2			Screw 5.95 x 12				3		009761-212					31-1					Wing Nut 5.95								1		118262..002
	3			Bushing				1		141404..000					32					Stud								1		141426..001
	4-1- 1			Feed Cam				1		----					33					Screw 6.35 x 6								1			01477o-622
	4-1- 2			Thread		Release Cam Segment		1		143943..001					34-1					Feed		Guide		Shaft Bracket				1		141427..002
	4-1- 3			Screw 4.37				2		107407..003					35					Bushing								2		142374..000
	4-1- 4		Thread Tension Release Segment (B)					1		143944-001					36					Bolt 8 x 14								3		018081-422
	4-1- 5			Screw 4.37 x 12				2		009681-212		L-4·1			37					Feed Guide				Shaft				1		141429..001
	4-1- 6			Bar Tack Cam Segment				2		141445..001		Feed Cam			38					Feed		Arm	Bracket					1		141430.002
												Assembly
	4-1- 7			Screw 4.37 x 12				4		009681-212					39					Screw 6.35 x 6								1		014770-622
												143942..001
	4-1- 8			Stop	Cam Segment (Large)			1		141446..001					40					Stud								1		141431..001
	4-1- 9			Screw 4.37 x 10				2		009681-012					41					Feed		Bar Guide Block						1		118215..001
	4-1-10			Cutter Segment				1		141448-001					42						Stop	Ring	E4					1		048040-342
	4-1-11			Screw 4.37				2		107407-003					43·1					Length Feed				Arm				1		141433-002
	5			Bushing				1		142375-000					44-1					Feed		Arm	Shaft					1		141434..001
	6			Washer				1		141400001					45					Screw 6.35 x 6								1		----
																														014770 622
	7			Screw 5.95				1		141408-001					46-1					Collar								1								L-46
																																				Collar Assembly
	8			Cam	Brake Wire		(A)	1		141409-001					46-2					Screw 6.35								2						101706.. 003	181969-003
	9			Cam	Brake Wire		(B)	1		141410..001					48						Screw 6.35							I			I4I439-001
	10			Spring				1		141411..001					49-1					Guide		Plate						1		141440..001
	11			Cam Brake Hook			Bracket	1		141412-001						so				Screw 4.37 x 6								2			00968o-612
	12			Nut 7.94				1		106147-002					51					Stud								1		141441..001
	13			Hook				1		141413..001					52					Screw 4.37								I		151601..002
	14			Adjusting Hook				1		140947..002					53					Upper Clamping Foot Spring								1		141442..001
	15			Nut 4				2		021400.102					54					Screw 3.18 x 3.5								1		009669-312
	16-1			Length		Feed Adjusting Lever		1		143739..002					55					Stopper								1		144541..001
	17			Bushing				2		142372..000					59						Lower Feed			Arm				1		143738..002
	18			Length Feed Adjusting Lever Shaft				1		141417..001					60					Screw 4.37 x 20								2		009682-012
	19			Screw		5.95		1		151605-002					61-1						Length Feed			Plate				1		145248..001
	20.2			Length		Feed Indicator Plate		1		143740-001					62					Bolt 4.37 X 10								2		017681..012
	21			Screw 3.57 x 6				1		00967o-612					63					Washer								2		113431..002
	22-1			Length		Feed Indicator		1		141419-001					64-1						Length Feed			Guide Plate				2		143743..001
	23			Roller		Stud		1		141420-001					65					Screw		3.57						4		106568..003
	24			Roller				1		107550-002					66					Washer								2		118735..002
	25			Feed	Lever (A)			1		141421-002					67					Washer								2		100645..003

NOTE! PREFIX ALL NUMBERS BY 'BR'.] [ EXAMPLE BR009681-0-14

-11-

From the library of: Superior Sewing Machine & Supply LLC