Table Of Contents - JUKI MF-7800 Instruction Manual

1 1 1 1 1 . SPECIFICATIONS ........................................................................................................ 1
2 2 2 2 2 . CONFIGURATION OF THE MACHINE COMPONENTS ............................................. 5
3 3 3 3 3 . INSTALLATION ............................................................................................................ 8
1. Installing the machine head onto the table................................................................................ 8
2. Selecting the motor pulley and the belt ................................................................................... 11
3. Installing the motor .................................................................................................................... 14
4. Setting the belt ........................................................................................................................... 16
5. Installing the belt cover ............................................................................................................. 18
6. IInstalling the chain .................................................................................................................... 19
7. Installing the thread guide ......................................................................................................... 19
4 4 4 4 4 . LUBRICATION AND OILING...................................................................................... 20
1. Lubricating oil............................................................................................................................. 20
2. Oiling ........................................................................................................................................... 22
3. Sillcon oil lubrication unit ......................................................................................................... 23
5 5 5 5 5 . OPERATION ............................................................................................................... 24
1. Needle.......................................................................................................................................... 24
2. Attaching the needle .................................................................................................................. 25
3. Threading the machine head..................................................................................................... 26
(1)Standard threading ....................................................................................................................... 27
(2)Threading for soft seams ............................................................................................................. 30
4. Adjusting the stitch length ........................................................................................................ 33
5. Adjusting the differential feed ratio .......................................................................................... 35
6. Adjusting the presser foot pressure ........................................................................................ 37
7. Adjusting the thread tension ......................................................................................................... 38
6 6 6 6 6 . ADJUSTING THE SEWING MACHINE ...................................................................... 39
1. Adjusting the silicon container thread guide .......................................................................... 39
2. Adjusting the needle bar thread take-up thread receiver ....................................................... 41
3. Adjusting the rocking thread take-up ....................................................................................... 42
4. Adjusting the rocking thread take-up thread receiver ............................................................ 43
5. Adjusting the spreader thread guide ........................................................................................ 44
6. Adjusting the looper thread cam .............................................................................................. 45
7. Adjusting the looper thread cam thread guide ........................................................................ 46
8. Adjusting the looper thread winding prevention plate ........................................................... 47
9. Adjusting the looper .................................................................................................................. 48
10. Adjusting the height of the needle ......................................................................................... 50
11. Adjusting the rear needle guard ............................................................................................. 52
12. Relation between the rocking thread take-up timing and the needle thread loop ............. 54
13. Adjusting the height of the feed dog ...................................................................................... 57
14. Installing position of the spreader.......................................................................................... 58
15. Adjusting the spreader thread guide and the needle clamp thread guide ......................... 60
16. Adjusting the front needle guard ............................................................................................ 62
17. Adjusting the presser foot lift ................................................................................................. 64
18. Adjusting the micro-lifter ......................................................................................................... 65
7 7 7 7 7 . MAINTENANCE .......................................................................................................... 66
1. Cleaning the sewing machine ................................................................................................... 66
2. Replacing the lubricating oil ..................................................................................................... 67
3. Inspecing and replacing the oil filter ........................................................................................ 68
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