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CONTENTS
BEFORE OPERATION ...................................................................................................................................1
SPECIFICATIONS .........................................................................................................................................1
1. INSTALLATION ......................................................................................................................................2
2. ADJUSTING THE BELT TENSION ..........................................................................................................3
3. INSTALLING THE THREAD STAND .......................................................................................................3
4. LUBRICATION .......................................................................................................................................4
5. ATTACHING THE BELT COVER ..............................................................................................................5
6. ATTACHING THE NEEDLE .....................................................................................................................5
7. THREADING THE MACHINE HEAD .......................................................................................................6
8. THREADING THE LO OPERS .................................................................................................................7
9. THREAD TENSION ................................................................................................................................8
10. ADJUSTING THE REMAINING LENGTH OF TRIMMED THREAD
(MH-481-4, MH-481-5, MH-484-4, MH-484-5) ....................................................................................8
11. HOW TO INSTALL THE SILICON OIL LUBRICATING UNIT ....................................................................9
12. ADJUSTING THE PRESSER FOOT .........................................................................................................9
13. ADJUSTING THE STITCH LENGTH .....................................................................................................10
14. DIFFERENTIAL FEED ADJUSTMENT (MH-484, MH-484-4, MH-484-5) ............................................11
15. HEIGHT AND ANGLE OF THE PRESSER FOOT ...................................................................................11
16. ATTACHING THE FEED DOG ...............................................................................................................12
17. ADJUSTING THE FEED TIMING ..........................................................................................................13
18. COUNTERFORCE OF THE FEED LEVER ..............................................................................................14
19. NEEDLE-TO-LOOPER REL ATION ........................................................................................................14
20. ADJUSTING THE LOOPER AVOIDING MOTION .................................................................................16
21. THREAD SPREADER ...........................................................................................................................16
22. MATCHING THE MOTION OF THE NEEDLE GUARDS WITH THE LOOP GUIDE .................................18
23. POSITIONING THE LOOPER THREAD TAKE-UP .................................................................................19
24. POSITION OF THE THREAD TAKE-UP LEVER .....................................................................................20
25. POSITION OF THE FRAME THREAD EYELET ......................................................................................20
26. THREAD TRIMMING (MH-481-4, MH-481-5, MH-484-4, MH-484-5) ................................................20
27. ADJUSTING THE WIPER (MH-481-4, MH-481-5, MH-484-4, MH-484-5) ..........................................23
28. ADJUSTING THE NEEDLE THREAD CLAMPING ARM
(MH-481-4, MH-481-5, MH-484-4, MH-484-5) ..................................................................................24
29. ADJUSTING THE DRAW-OUT AMOUNT OF THE LOOPER THREAD
(MH-481-4, MH-481-5, MH-484-4, MH-484-5) ..................................................................................24
30. GATHER SEWING ATTACHMENT (MH-484, MH-484-4, MH-484-5) ..................................................25
31. MOTOR PULLEY AND SEWING SPEED (MH-481, MH-484) ...............................................................25
32. TROUBLES IN SEWING AND CORRECTIVE MEASURES.....................................................................26
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