Table Of Contents - JUKI MF-7900 Instruction Manual

!. SPEcIFIcatIoNS ..........................................................................................................1
@. coNFIGuratIoN oF tHE MacHINE coMPoNENtS ...............................................2
#. INStaLLatIoN ..............................................................................................................3
1. Installing the machine head onto the table ........................................................................... 3
2. Selecting the motor pulley and the belt ................................................................................. 9
3. Installing the motor .................................................................................................................. 9
4. Setting the belt ........................................................................................................................ 9
5. Installing the belt cover ......................................................................................................... 10
6. Installing the chain ................................................................................................................ 10
7. Installing the thread guide .................................................................................................... 10
8. Installing the needle bar thread take-up cover ................................................................... 11
$. LuBrIcatIoN aND oILING .......................................................................................11
1. Lubricating oil ........................................................................................................................ 11
2. oiling ....................................................................................................................................... 11
3. Silicon oil lubricating unit ..................................................................................................... 12
%. oPEratIoN .................................................................................................................12
1. Needle ..................................................................................................................................... 12
2. attaching the needle .............................................................................................................. 12
3. threading the machine head ................................................................................................ 13
(1) Standard threading .................................................................................................................. 13
4. adjusting the stitch length .................................................................................................... 14
5. adjusting the differential feed ratio ..................................................................................... 14
6. adjusting the presser foot pressure......................................................................................... 15
7. adjusting the thread tension ................................................................................................ 15
^. aDJuStING tHE SEWING MacHINE .......................................................................................16
1. adjusting the silicon container thread guide ...................................................................... 16
2. adjusting the needle bar thread take-up thread receiver .................................................. 16
3. adjusting the rocking thread take-up .................................................................................. 17
4. adjusting the spreader thread guide ................................................................................... 17
5. adjusting the looper thread cam thread guide and the looper thread cam ..................... 17
6. adjusting the looper .............................................................................................................. 18
7. adjusting the height of the needle ....................................................................................... 18
8. adjusting the rear needle guard ................................................................................................................. 19
9. relation between the rocking thread take-up timing and the needle thread loop ..............19
(1) adjustment by the crank ......................................................................................................... 19
(2) adjustment by the eccentric cam ........................................................................................... 20
10. adjusting the height of the feed dog ................................................................................... 21
11. Installing position of the spreader ....................................................................................... 21
12. adjusting the spreader thread guide and the needle clamp thread guide ....................... 22
13. adjusting the front needle guard ......................................................................................... 22
14. adjusting the presser foot lift ............................................................................................... 23
15. adjusting the micro-lifter ...................................................................................................... 23
16. adjusting the feed locus ....................................................................................................... 24
(1) retarding the feed driving motion .......................................................................................... 24
(2) retarding the feed rocking motion ......................................................................................... 25
17. adjustment value of balloon ................................................................................................. 26
&. MaINtENaNcE ...........................................................................................................28
1. cleaning the sewing machine ............................................................................................... 28
2. replacing the lubricating oil ................................................................................................ 28
3. Inspecting and replacing the oil filter .................................................................................. 28
coNtENtS