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CONTENTS
1. NEEDLES & THREADING
1-1 Needles ··········································· 1
1-2 Needle replacement ··························· 1
1-3 Correct threading the machine ············ 2
2. MACHINE SPEED
2-1 Machine speed & operating direction ···· 3
2-2 Motor & belt ····································· 3
3. LUBRICATION
3-1 Oil specification ································ 4
3-2 Oiling ·············································· 4
3-3 Oil & filter replacement ····················· 4
3-4 Oiling respective parts ······················· 5
3-5 Oiling HR device ······························· 5
4. INSTALLATION
4-1 Table diagram ·································· 6
4-2 Installation process ··························· 8
5. NEEDLE BAR HEIGHT ADJUSTMENT
5-1 Initial needle bar height ····················· 9
5-2 Needle bar height adjustment ············· 9
6. LOWER LOOPER ADJUSTMENT
6-1 Lower looper gauge ·························· 10
6-2 Clearance between lower looper and
needle ··········································· 10
7. UPPER LOOPER ADJUSTMENT
7-1 Gauge of upper looper and needle ······· 11
7-2 Looper relation ································ 11
8. FEED DOG & STITCH LENGTH ADJUSTMENT
8-1 Feed dog height adjustment ··············· 12
8-2 Feed dog inclination adjustment ········· 12
8-3 Stitch length adjustment ··················· 13
8-4 Differential feed dog adjustment ········· 13
9
. PRESSER FOOT ADJUSTMENT
9-1 Presser foot pressure adjustment ········ 14
9-2 Position & maximum lift height ·········· 14
10. STITCH FORMATION ADJUSTMENT
10-1 Thread tension adjustment ·············· 15
10-2 The needle thread take-up & thread
eyelet adjustment ·························· 15
10-3 Looper thread take-up adjustment ······ 16
11. UPPER & LOWER KNIFE ADJUSTMENT
11-1 Correct knife position ······················ 17
11-2 Lower knife sharpening ··················· 17
12. NEEDLE GUARD ADJUSTMENT
······ 18
13. STANDARD MEASUREMENT TABLE
19
Summary of Contents for JJ Series
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