JUKI MO-1000 Series Service Manual page 51

adjustment Procedure
Checking items:
1 Hook
* Hook 1 has no vertical/lateral bend. It has to be equidistantly spaced
from the right and left guide plates.
* Check that hook 1 enters the eyelets in the right and left needles to
thread the needles. (The needle threader supports needle counts #1
to #4.)
* Check whether the lower end of hook 1 interferes with the needle. If
there is interference between them and cannot be corrected, replace
the needle threader with a new one.
How to perform adjustment:
1. Loosen the setscrews (A) and (B).
2. Adjust the lateral position of the hook by moving base (C) to the right
and left. Move the operating lever downward until the threading posi-
tion is reached.
Adjust the lateral position of base (C) by turning hook asm. (D) so
that the hook enters the right needle eyelet. Then, fix base by tight-
ening screw (A).
At this time, fix the threading shaft so that it is in parallel to the nee-
dle bar. (It is accepted to visually check the parallelism.)
3. Adjust the vertical position of hook asm. (D) by moving it in axial
direction. Bring the hook to the position where the lower end of the
hook does not interfere with the lower end of the needle eyelet and
fix the hook at that position with screw (B).
The jutting amount of the hook from the needle eyelet is 1.8 mm.
After the adjustment, lift the operating lever. At this time, check
whether the hook does not interfere with the presser bar and the nee-
dle clamp.
Results of Improper adjustment
If the threader shaft is not in paral-
lel to the needle bar, the operating
resistance of the operating lever
can increase when the lever is lifted
from the threading position.
If the jutting amount of the hook
from the needle eyelet deviates
substantially from the standard
adjustment value, interference
between the hook and the needle
clamp and needle bar can occur.
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