JUKI AMB-289, Engineer'S Manual

Page: 59 / 177

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Removing the looper rocking base
1. Fix the main shaft with hand pulley, and loosen three looper shaft
sprocket setscrews .
2. Loosen two idler setscrews , and remove looper shaft sprocket .
At this time, fix timing belt with gum-tape or the like while holding
timing belt with the sprockets of main shaft and main motor shaft
so that the timing of main shaft and main motor shaft is not changed.
3. Loosen two looper shaft fixing screws of looper bearing bush ,
and remove looper bearing bush .
4. Loosen two looper rocking base fixing screws and , and re-
move looper rocking base .
5. Loosen four setscrews of two looper shaft thrust collars .
Installing the looper rocking base
1. Place four washers
to looper rocking base , and aim at the
center of screw holes of the washers to attach the base with two
looper rocking base fixing screws
and .
2. Insert looper bearing bush to looper shaft bearing , adjust the
flat section of looper shaft to screw No. 1 of looper bearing bush
in the state that the edge of looper bearing bush is aligned with
the edge of looper shaft , and tighten looper shaft fixing screws .
3. Insert thrust washer to looper shaft thrust collar in the rear, and
take the thrust looseness of looper shaft . Then adjust the flat sec-
tion of looper shaft to screw No. 1, and fix the collars with four
setscrews .
4. Put looper shaft thrust collar on the front side to the edge of the
other thrust collar and fix it with four setscrews .
5. Engage the looper shaft sprocket with the looper bearing bush
while the timing belt is hitched on the sprocket, and tighen them
with the screw .
6. Tighten two idler setscrews into the idler pulley plate while
applying tension to the timing belt .
7. Loosen looper sleeve setscrew , and setscrews and of yoke
slide triangle cam and yoke slide lengthwise cam .
8. After performing looper adjustment "refer to (2) Adjusting the clear-
ance between the needle and the looper.", and perform adjustment
of the yoke slide triangle cam and the yoke slide lengthwise cam
"refer to (4) Adjusting the position of the yoke slide.".
Procedures of disassembling / assembling Caution in disassembling / assembling