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6.12 Upper Looper Components No. Part No. 1 20705002 2 207S11016 3 207S11005 4 20704003 5 20704004 6 S05018 7 20702004 8 20628006 9 207S11004 10 20628005 11 20708006 12 20622019 13 20708007 14 20705003 15 207S12002 16 20726004 17 20523005 18 207S14010 19 20704005 20 20623005 21 207S11025 22 XXXXXXXX 25 207S11026 26 20715007 27 207S17004 28 207S11027 29 20123021 30 20723005 31 20712017 32 207S11020 Description Connection assembly Screw Screw Crank assembly Crank assembly Screw Shaft Washer Screw Spring washer Spacer Oil Seal Spacer Lever assembly Screw Pin assembly Oil wick Screw Upper looper holder assembly Felt Screw Upper looper Screw Cover Screw Screw Oil wick Felt Bracket Screw 3 thread 1 2 2 1 0 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 Qty 4 thread 1 2 2 0 1 1 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 5 thread 1 2 2 0 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 Ultra High Speed Overedge and Safety Stitch Machine | Instruction Manual and Parts List 45

Section	Page
Contents	2
1 Safety Instructions	4
1.1 Important Safety Instructions	4
1.2 For Safe Operation	5
2 Product Description and Machine Specification	6
2.1 Product Description	6
2.2 Machine Specification	7
2.3 Motor, Motor Pulley and V-Belt Specifications	8
3 Setup and Adjustment Instructions	9
3.1Table Cut-OutDiagram	9
3.2 Machine Installation	10
3.3 Lubrication and OilDrainage	12
3.4 Fill Silicon Oil to Reservoir	13
3.5 Needle Attachment (or Replacement)	13
3.6 Replacing Upper and Lower Knife	14
3.7 MachineThreading	15
3.7.1 EasyThreadingMethod	15
3.7.2ThreadingDiagram	15
3.8 Thread Tension Adjustment	16
3.9 Presser foot pressure	17
3.10 Adjusting the Differential Feed Rate	17
3.11 Stitch Length Adjustment	18
3.12 Parts Relation and Timing	19
4 Maintenance	20
4.1 Machine HeadCleaning	20
4.2 Oil Changeand FilterCleaning	20
4.3 SafetyInspection	20
5 Troubleshooting	21
6 Parts list	23
6.1 Machine Bed Frame Components	24
6.2 Machine Cover Components (1)	26
6.3 Machine Cover Components (2)	28
6.4 Crank shaft Drive Components	30
6.5 Thread Tension Components	32
6.6 Thread Guide and Thread Take-up Components (1)	34
6.7 Thread Guide and Thread Take-up Components (2)	36
6.8 Thread Guide and Thread Take-up Components (3)	38
6.9 Needle Bar Components (1)	40
6.10 Needle Bar Components (2)	42
6.11 Needle Plate and Needle Guard Components	44
6.12 Upper Looper Components	46
6.13 Lower Looper Components	48
6.14 Chain Stitch Looper Components (1)	50
6.15 Chain Stitch Looper Components (2)	52
6.16 Differencial Feed Components	54
6.17 Feed Dog Components	56
6.18 Knife Drive Components	58
6.19 Presser Foot Components	60
6.20 Lubrication Components (1)	62
6.21 Lubrication Components (2)	64
6.22 Silicon Oil Reservoir Components	66
6.23 Exclusive Parts List for 321K series	68
6.24 Thread Stand Components	70
6.25 Accessories	72
6.26 Machine Support Plate For Semi-Submerged Components	74
6.27 Specific Parts for 321D-251 Hand 321K-251H	75
6.28 Optional Parts	76
6.29 Back Latch Components	78
6.30 Vacuum Suction & AFL Device (Option parts)	80
ChainCutter DeviceComponents	82