Industrial Sewing Machine SADE
120
NOTE!
Any failure
, regardless of whether it turns off the engine or allows
you to continue working, should be reported to an authorized ser-
vice center for its removal.
If any faults have occurred, check whether you are able to correct the problem by your-
self. The following overview can help you. Never try to repair the machine by yourself. If
it is necessary to repair the machine, contact your authorized service representative.
Table 2.
Troubles Causes Corrective measures
1. Thread breakage
(Thread frays or is
worn out.)
Thread path, needle point,
hook blade point or bobbin case
resting groove on the throat plate
has sharp edges or burrs.
○ Remove the sharp edges or burrs
on the blade point of hook using a
fine emery paper. Buff up the bobbin
case resting groove on the throat
plate.
Needle thread tension is too
high.
○ Decrease the needle thread ten-
sion.
Bobbin case opening lever
provides an excessive clearance
at the bobbin case.
○ Decrease the clearance provided
between the bobbin case opening
lever and the bobbin. Refer to "6.7.
Adjusting the bobbin case open-
ing lever" p. 63.
Needle comes in contact with
the blade point of hook.
○ Refer to "6.5. Needle-to-hook re-
lation" p. 61.
Amount of oil in the hook is too
small.
○ Adjust the amount of oil in the
hook properly. Refer to "8.2. Lubri-
cation" p. 117.
(Needle thread trails 2
to 3 cm from the wrong
side of the fabric.)
Needle thread tension is too
low.
○ Increase the needle thread ten-
sion.
Thread take-
up spring works
excessively or the stroke of the
spring is too small.
○ Decrease the tension of the spring
and increase the stroke of the
spring.
Timing between the needle
and the hook is excessively ad-
vanced or retarded.
○ Refer to "6.5. Needle-to-hook re-
lation" p. 61.
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