Jack JK-798 DI Manual

CONTENTS

Machine Bed Frame		1
(1)	Cover(1)	3
(2)	Cover(2)	5
Crankshaft Drive Mechanism		7
Thread Tension Mechanism		9
(1) Thread Guide and Thread Takeup(1)		11
(2) Thread Guide and Thread Takeup(2)		13
(3) Thread Guide and Thread Takeup(3)		15
(1) Needle Drive Mechanism(1)		17
(3) Needle Drive Mechanism(3)		19
(4) Needle Drive Mechanism(4)		21
Upper Looper Drive Mechanism		23
Lower Looper Drive Mechanism		25
(1) Chainstitch Looper Drive Mechanism(1)		27
(2) Chainstitch Looper Drive Mechanism(2)		29
Feed Mechanism		31
Feed Mechanism		33
Knife Drive Mechanism		35
Presser Foot Mechanism		37
(1) Lubrication Mechanism(1)		39
(2) Lubrication Mechanism(2)		41
HR H.R.Device		43
Thread Stand		45
Part For Semi-Submerged Installation		47
Specific Parts		49
Specific Parts		51
Specific Parts		53
Specific Parts		55
Specific Parts		57
Specific Parts		59
Back Latch Components		61
798D /798D Direct Drive Assemblies		63
Accessories Assemblies		65
Standard measurement part list		67

From the library of: Superior Sewing Machine & Supply LLC

/Machine Bed Frame

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	P03010	240333	5×16	Pin	1	1	1
2	P03017	201002	5×10	Pin	1	1	1
3	20711001	210194		Indicator guide	2	2	2
4	20713027	240325		Pipe	2	2	2
5	P03018	240299	4×40	Pin	1	1	1
6	20628023	208173		Plug	1	1	0
7	20701002	270008-91		Bracket Assembly	1	1	1
8	207S13003	4511	M6×25	Screw	2	2	2
9	206S30001	270047		Bed pin	4	4	4
10	P03019	240342	5×14	Pin	1	1	1
11	20126001	----		Pin	1	1	1
12	20726009	----		Pin	0	0	1( )
13	20701001	270001-9S		Machine Bed Complete	1	1	1
14	20703001	----		Sleeve	1	1	1
15	20703002	----		Sleeve	1	1	1
16	20703003	----		Sleeve	1	1	1
17	20703004	----		Sleeve	1	1	1
18	20703009	----		Sleeve	1	1	1
19	20703006	----		Sleeve	1	1	1
20	20703007	----		Sleeve	1	1	1
21	20703008	----		Sleeve	1	1	1
22	20703009	----		Sleeve	4	4	6

798D 13 63 798D

Note: Parts for 798DI with No.13 should be read on Page 63, others are the same.

-2-

From the library of: Superior Sewing Machine & Supply LLC

(1)/Cover(1)

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	300164	270020-SD		Top Cover	1	1	1
2	207S11012	7020	M4×10	Screw	4	4	4
3	20722001	270021		Gasket	1	1	1
4	20622003	240305		Cushion Rubber	3	3	3
5	30111022	179107-05		Oil sight window	1	1	1
6	20722002	240110		Plug	1	1	1
7	300165	270010-UD		Side Cover	1	1	1
8	207S11012	7020	M4×10	Screw	2	2	2
9	207S11008	7021	M4×12	Screw	2	2	2
10	2070201100	274011-91		Presser Bar	1	1	1
11	20712043	270013		Front Cover(left)	0	0	1
12	207S17001	7044	M4×10	Screw	4	4	4
13	20711003	270024-9U		Belt Cover Assembly	1	1	1
14	20622003	2403050		Rubber Cute	1	1	1
15	S01013	7176	M6×14	Screw	3	3	3
16	20712001	270025		Fan Cover	1	1	1
17	207S11007	7019	M4×7.5	Screw	1	1	1
18	300166	270011-UD		Front Cover(right)	1	1	1
19	20701006	270014		Hinge	1	1	1
20	207S11008	7021	M4×12	Screw	3	3	3
21	20626001	240043		Pin	1	1	1
22	207S14001	4543	M4×4	Screw	2	2	2
23	20627001	240301		Spring	1	1	1
24	20712002	270018		Latch	1	1	1
25	207S11009	7009	M3×2.5	Screw	1	1	1
26	207S14002	4574	M3×12	Screw	1	1	1
27	207S14003	4535	M3×4	Screw	1	1	1
28	20712003	270017		Latch	1	1	1
29	S01031	7017	M4×4.7	Screw	1	1	1
30	20612004	210044	1	Flat Spring	1	1	1
31	S01031	7017	M4×4.7	Screw	1	1	1
32	20712004	270012		Front Cover(left)	1	1	0
33	207S11011	7018	M4×5	Screw	2	2	2
34	20712005	270028		Side Cover	1	1	1
35	xxxxxxxx	----		Threading diagram	1	1	1
36	xxxxxxxx	----		Threading diagram	0	0	1

-4-

From the library of: Superior Sewing Machine & Supply LLC

(2)/Cover(2)

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	2071204400	270035		Cloth Plate	0	0	1
2	2071200600	270037		Cloth Plate	1	1	0
3	20603016	270042		Bushing	1	1	1
4	207S14007	4543	M4×4	Screw	1	1	1
5	W02004	----	6	Washer	1	1	1
6	30228008	204115		Washer	1	1	1
7	207S11011	7018	M4×5	Screw	1	1	1
8	20622003	240305		Cushion Rubber	1	1	1
9	20711018	270030-UB		Side Cover(Wide)	0	0	1
10	20711004	270031-UB		Side Cover(Narrow)	1	1	0
11	207S11013	7025	M4×17.5	Screw	1	1	1
12	W02002	201252	4	Spring Washer	1	1	1
13	S01002	7018	M4×5	Screw	2	2	2
14	20528017	240343		Washer	2	2	2
15	20622003	240305		Cushion Rubber	1	1	1
16	20612016	270049		Latch	1	1	1
17	207S11014	7180	M3.5×4.5	Screw	1	1	1
18	20712008	270015		Plate	1	1	1
19	207S17003	7170	M4×7.5	Screw	2	2	2
20	20627002	270043		Lever	1	1	1
21	206S20006	7172	M4	Screw	1	1	1
22	20627003	270044		Spring	1	1	1
23	20612009	270045		Bracket	1	1	1
24	20712010	270019		Fabric Guide	1	1	1
25	207S11007	7019	M4×7.5	Screw	2	2	2
26	20711005	270032		Eye Guide	1	1	0
27	20711019	270033		Eye Guide	0	0	1
28	207S11015	7062	M3×6	Screw	2	2	2
29	W01011	----	3	Washer	2	2	2
30	20712011	270034		Bracket	1	1	1
31	207S20002	7066	M4	Screw	1	1	1
32	20128015	210307		Washer	2	2	2
33	20701084	270022		Bed Cover Plate Assy.	1	1	1
34	207S12001	7084	M4×8	Screw	5	5	5
35	20722003	270023		Gasket	1	1	1
36	2071201200	270026		Cover Plate	1	1	1
37	S01005	7020	M4×10	Screw	4	4	4
38	207S11016	7023	M4×16	Screw	1	1	1
39	N01001	4821	M4	Nut	1	1	1
40	10122020	----		Oil Reservoir Cushion	1	1	1

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From the library of: Superior Sewing Machine & Supply LLC

/Crankshaft Drive Mechanism

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	400046	270500A		Crankshaft	1	1	0
2	400045	270500C		Crankshaft	0	0	1
3	20712066	----		Washer	2	2	2
4	20701008	270502		Blance Weight	2	2	2
5	207S11017	7011	M3×8	Screw	4	4	4
6	20726002	270503		Pin	1	1	1
7	S10009	4541	M6×8	Screw	1	1	1
8	20712013	270508		Cover	1	1	1
9	207S11007	7019	M4×7.5	Screw	3	3	3
10	O01024	240340	O 40×1.8	O Ring	1	1	1
11	B04004	270507-91	6202LB	Ball Bearing	1	1	1
12	207S11018	4572	M5×10	Screw	1	1	1
13	207S14012	4514	M5×5	Screw	1	1	1
14	20729001	240335		Ring	1	1	1
15	B04005	211526	6203LLU	Ball Bearing	1	1	1
16	B04005	211526	6203LLU	Ball Bearing	1	1	1
17	W03003	240306	32	Washer	4	4	4
18	20103002	----		Oil Seal	1	1	1
19	O01025	210057	O 17×1.8	O Ring	1	1	1
20	O01028	240307	O 41×1.8	O Ring	1	1	1
21	20708015	211528		Right Cover	1	1	1
22	207S11012	7020	M4×10	Screw	3	3	3
23	2071100600	270505		Fan Assy.	1	1	1
24	300167	270504-UD		Machine Pulley	1	1	1
25	S10009	4541	M6×8	Screw	2	2	2
26	207S13004	4523	M6×35	Screw	1	1	1
27	W02004	204293	6	Spring Washer	1	1	1
28	20602002	270510		Pin	0	0	0
29	20712046	270509		Cover	0	0	0
30	207S17001	7044	M4×10	Screw	0	0	0
31	207S11012	7020	M4×10	Screw	0	0	0
32	20708003	272523A0		Spacer	1	1	1
33	20701009	270526		Cover	1	1	1
34	O01037	----	O 30×1.2	O Ring	2	2	2
35	20725001	----		Ratchet	1	1	1

798D 23 24 25 26 27 33 63 798D

Note: Parts for 798DI with No.23,24,25,26,27,33 should be read on Page63, others are the same.

-8-

From the library of: Superior Sewing Machine & Supply LLC

/Thread Tension Mechanism

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	400662	210529-9U	Tension Spring Assembly Red		1	1	1
2	301S16006	208447-UA		Knob	1	1	1
3	30111006	208448		Rachet	1	1	1
4	30111005	208450-UA		Cup	1	1	1
5	400161	210319		Tension Disc	2	2	2
6	20623008	208449		Felt	1	1	1
7	201S30016	5082A		Screw Stud	1	1	1
8	20727011	20137		Spring	1	1	1
9	400663	210531-9U	Tension Spring Assembly(Bule)		1	1	1
10	30127013	201086		Spring	1	1	1
11	20713001	27500		Thread Guide	1	1	1
12	207S11007	7019	M4×7.5	Screw	2	2	2
13	20712015	275001		Thread Guide	1	1	1
14	20612052	202849		Tension Guide	3	4	4
15	206S11005	4009-HC	SM11/64×40	Screw	1	0	0
16	400661	210530-9U	Tension Spring Assembly(Yellow)		0	1	1
17	400668	210532-9U	Tension Spring Assembly(Green)		1	1	1

-10-

From the library of: Superior Sewing Machine & Supply LLC

(1)/Thread Guide and Thread Takeup(1)

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	20701029	275021		Bracket	0	0	1
2	207S11019	7082	M4×7.5	Screw	0	0	2
3	20713020	275024		Thread Guide	0	0	1
4	20713052	275049		Thread Takeup	0	0	1
5	207S14001	4543	M4×4	Screw	0	0	1
6	20701030	275026		Bracket	0	0	1
7	S01031	7017	M4×4.7	Screw	0	0	1
8	20713021	275022		Thread Guide	0	0	1
9	207S14001	4543	M4×4	Screw	0	0	1
10	20713022	275029		Thread Guide	0	0	1
11	207S11015	7062	M3×6	Screw	0	0	2
12	20713050	275052		Thread Guide	0	0	1
13	S01031	7017	M4×4.7	Screw	0	0	1
14	20713023	275028		Thread Guide	0	0	1
15	20713051	275057		Thread Guide	0	0	1
16	S01031	7017	M4×4.7	Screw	0	0	1
17	20713006	275011		Bracket	0	0	1
18	20713007	275012		Thread Retainer	0	0	1
19	207S20003	7163		Screw	0	0	1
20	20727002	240326		Spring	0	0	1
21	20713024	275027		Thread Takeup	0	0	1
22	207S11015	7062	M3×6	Screw	0	0	2

-12-

From the library of: Superior Sewing Machine & Supply LLC

(2)/Thread Guide and Thread Takeup(2)

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	20713002	275013A		Thread Guide	1	0	0
2	20713003	275013		Thread Guide	0	1	0
3	207S14001	4543	M4×4	Screw	1	1	0
4	20701010	275015		Bracket	1	1	0
5	207S11019	7082	M4×4.7	Screw	1	1	0
6	20713004	275018		Thread Guide	1	0	0
7	20713005	275018A		Thread Guide	0	1	0
8	207S11015	7062	M3×6	Screw	2	2	0
9	207S11019	7082	M4×4.7	Screw	1	1	0
10	20713006	275011		Bracket	1	1	0
11	20713007	275012		Thread Retainer	1	1	0
12	207S20003	7163		Screw	1	1	0
13	20727002	240326		Spring	1	1	0
14	20713008	275016		Thread Takeup	1	0	0
15	20713009	275017		Thread Takeup	0	1	0

-14-

From the library of: Superior Sewing Machine & Supply LLC

(3)/Thread Guide and Thread Takeup(3)

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	20712016	275004		Bracket	1	1	1
2	20113015	275047		Thread Guide	2	2	2
3	201S11006	----		Screw	2	2	2
4	W01011	----		Washer	2	2	2
5	20713010	275005		Thread Takeup	1	1	1
6	207S11007	7019	M4×7.5	Screw	1	1	1
7	20713011	275006		Thread Guide	1	1	1
8	207S11020	7008	M3×4	Screw	1	1	1
9	20713012	275007		Thread Guide	1	1	0
10	20713053	275055		Thread Guide	0	0	1
11	20713054	275056		Thread Guide	0	0	1
12	20713015	275009		Thread Takeup	1	1	0
13	20713055	275054		Thread Takeup	0	0	1
14	207S11021	7012	M3.5×6	Screw	1	1	1
15	20713013	275010		Thread Guide	1	1	1

-16-

From the library of: Superior Sewing Machine & Supply LLC

(1)/Needle Drive Mechanism(1)

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	400039	271000-92		Connection	1	1	1
2	207S11016	7023	M4×16	Screw	2	2	2
3	20626003	271001		Pin	1	1	1
4	207S14007	4538	M4×6	Screw	1	1	1
5	20704001	271002-92		Crank	1	1	1
6	S05018	4533	M6×0.75×12	Screw	1	1	1
7	20702002	271003		Shaft	1	1	1
8	20708004	240308		Collar	1	1	1
9	207S14001	4543	M4×4	Screw	2	2	2
10	20628014	208235		Washer	1	1	1
11	H05008	202577	8	Ring	1	1	1
12	20704002	271004-92		Lever	1	1	1
13	207S12002	7150		Screw	1	1	1
14	2072600300	271022-91		Shaft Assembly	1	1	1
15	20726003	271008-T		Shaft	1	1	1
16	20523005	----		Oil wick	1	1	1
18	20702003	271006-T		Needle Bar	1	1	1
19	20703012	271007		Bushing	1	1	1
20	207S14008	4546	M4×5	Screw	1	1	1
21	O01026	201022	O 11.5×1.5	O Ring	1	1	1
22	20723003	179009-05		Oil Felt	1	1	1
23	20708005	271009-92		Ring	1	1	1
24	207S11023	7035	M3×6	Screw	1	1	1
25	20722004	240310		Plug	1	1	1

-18-

From the library of: Superior Sewing Machine & Supply LLC

(3)/Needle Drive Mechanism(3)

					Number
NO.	Part NO.	Ref.Part No.		Description
					three-thread	four-thread	five-thread
1	xxxxxxxx	xxxxxxxx		Needle Holder Assembly	0	0	1
2	207S14014	4554	M3×3	Screw	0	0	2
3	20713017	275030		Thread Guide	0	0	1
4	207S11024	7120	M2×3	Screw	0	0	1
5	xxxxxxxx	xxxxxxxx		Needle	0	0	2
6	xxxxxxxx	xxxxxxxx		Needle	0	2	0
7	xxxxxxxx	xxxxxxxx	( )	Needle Holder	0	1	0
8	207S14014	4554	M3×3	Screw	0	2	0
9	20713018	275019C		Thread Guide	0	1	0
10	207S11024	7120	M2×3	Screw	0	1	0
11	xxxxxxxx	xxxxxxxx	( )	Needle Holder Assembly	1	0	0
12	207S14014	4554	M3×3	Screw	1	0	0
13	20713038	275019A	( )	Thread Guide	1	0	0
14	207S11024	7120	M2×3	Screw	1	0	0
15	xxxxxxxx	xxxxxxxx		Needle	1	0	0

-20-

From the library of: Superior Sewing Machine & Supply LLC