JUKI AMB-289 Engineer's Manual page 53

Procedures of disassembling / assembling
Removing the main motor
1. Fix the main shaft with hand pulley 1, and loosen three
setscrews 3 in main motor sprocket 2.
Loosen two idler setscrews 4, and remove main motor
sprocket 2.
At this time, fix timing belt 6 with gum-tape or the like while
holding timing belt 6 with sprockets 5 of main shaft and looper
shaft so that timing between main shaft and looper shaft is
not changed.
2. Loosen two main motor fixing screws 8 of main motor bearing
bush 7, and remove main motor bearing bush 7.
3. Loosen four motor setscrews 9, remove main motor !0 , and
draw out the connector.
Installing the main motor
1. After adjusting the boss section of main motor !0 to the hole
and pressing it so that the main motor cord is on the front side,
put the main motor between two main motor installing plates
!1 and four main motor setscrews 9, and temporarily tighten
the motor.
2. Adjust the flat section of main motor shaft to screw No. 1 of
main motor bearing bush 7, put main motor bearing bush 7
between main motor bearing !2 and the main motor shaft,
and securely tighten four main motor setscrews 9.
3. Pressing main motor bearing bush 7 to main motor bearing
!2 , loosen main motor shaft fixing screws 8.
4. Draw out the main motor cord from the slot located on the
bottom face of frame, pass it through the hole of control box
under the table, and insert the connector.
5. Assemble sprockets 2 and 5, put timing belt 6, and perform
timing adjustment of main shaft and main motor !0 . "Refer to
(1) Disassembling and assembling of the main shaft." Adjust
the timing with the adjustment of main motor sprocket 2 since
the timing between main shaft and looper shaft is adjusted.
Fixing procedure of the main shaft
1. Remove three setscrews A, and remove top cover !3 .
2. Adjust the main shaft to the upper dead point.
3. Setscrew B is used for fixing the main shaft using setscrew
B for fixing bottom feed unit (plate support !5 ) .
4. This setscrew B is the screw for fixing the bottom feed unit at
the time of delivery from factory and transportation. It is the
screw which is removed and not used at the time of sewing.
5. Press down hand pulley 1, install setscrew B to hand pulley
installing base !4 , and fix the hand pulley.
6. When releasing the fixing, remove setscrew B.
Caution in disassembling / assembling
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