Table Of Contents - JUKI DDL-8000A Engineer's Manual

1. Specifications ................................................................................................................. 1
2. Name of each component .............................................................................................. 3
3. Standard adjustment ...................................................................................................... 5
(1) Feed dog height and gradient ............................................................................................... 5
(2) Adjusting the needle and the hook ....................................................................................... 7
(3) Setting of feed timing ............................................................................................................ 9
1) Standaed adjustment .......................................................................................................................9
2) Feed trace and phase adjustment ...............................................................................................11
(4) Adjustment of inner hook presser position ....................................................................... 13
(5) Bobbin insertion ................................................................................................................... 15
1) Bobbin case with idling prevention spring .................................................................................15
(6) Adjustment of inner hook presser position ....................................................................... 17
(7) Lubrication ............................................................................................................................ 19
1) Method of lubrication ....................................................................................................................19
2) Method of lubrication to the oil tank ...........................................................................................21
3) Method of oil drainage from the oil tank ......................................................................................21
4) Cleaning of the oil filter ................................................................................................................23
5) Adjusting the amount of oil in the hook ......................................................................................25
6) Hook oil adjustment procedures ..................................................................................................25
7) Essentials for hook oil adjustments ............................................................................................25
8) Replacement of the hook shaft oil wick .......................................................................................25
(8) Adjustment of the origin of a presser lifter motor ........................................................... 27
(9) Adjustment of the amount of feeding ................................................................................. 31
1) Adjustment of foeward feed stitch length ...................................................................................31
2) Reverse feed stitch length check (manual) .................................................................................31
3) Reverse feed stitch length check (electrically-operated) ...........................................................31
4) Adjustment of normal/reverse stitching ......................................................................................33
5) Adjustment of feed 0 ......................................................................................................................33
6) Adjustment of ffeed dial section ...................................................................................................35
7) Installation of the reverse feed arm and the reverse feed solenoid ..........................................37
(10) Adjusting the needle thread presser device .................................................................... 39
1) Needle thread presser device .......................................................................................................39
2) Adjusting the remaining length of needle thread .......................................................................41
3) Length of needle thread remaining at the needle .......................................................................41
4) Response to problems occurring at the beginning of sewing ..................................................43
(11) Adjusting the thread trimming unit ................................................................................... 45
1) Adjustment of the thread trimming cam position .......................................................................45
2) Adjustment of the thread trimming link stopper screw ..............................................................45
3) Thread trimming cam timing .........................................................................................................47
4) Adjusting the knife unit .................................................................................................................51
5) Adjustment of thread trimming speed .........................................................................................51
6) Adjustment of rise of the second thread tension disc ...............................................................53
7) Adjustment of the driver part stopper ..........................................................................................55
8) Replacement of the knife unit .......................................................................................................57
9) Installed of thread tspreading plate .............................................................................................59
10) Installed length of the thread trimmer connector bar (asm.) ..................................................61
11) Installation position of the thread trimming shaft ....................................................................61
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