Garudan GF-1116 Series, User Manual

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5) Cause of troubles and troubleshooting
1) Sewing machine troubleshooting
No Symptom Checkpoints Root cause Corrective action
Direction and height of needle
Needle is inserted into wrong
position.
Reinsert the needle correctly.
Needle Needle is bent. Change the needle.
Bad timing of feed dog. Adjust the timing of feed dog.
1
Needle breaks Ascending level of needle bar Bad timing of needle and hook. Adjust the timing of needle and hook.
Height of needle Bad timing of needle and hook. Adjust the timing of needle and hook.
Gap between needle and hook Bad timing of needle and hook. Adjust the timing of needle and hook.
Threading method Wrong threading. Thread the needle correctly.
Needle
Bent needle or broken needle
tip.
Change the needle.
Direction and height of needle
Needle inserted in the wrong
position.
Insert the needle correctly.
2
Thread breaks Upper thread tension Too tight upper thread tension. Reduce tension of upper thread.
Lower thread tension Too loose lower thread tensin. Reduce tension of lower thread.
Working capacity of take-up lever
Loose upper thread. Adjust take-up lever spring.
spring
Direction and height of needle
Needle inserted in the wrong
position.
Reinsert the needle in the right direction.
Needle
Bent needle or broken needle
tip.
Change the needle.
Threading
Thread passing at wrong
position.
Change the needle.
Ascending level of needle bar
Wrong timing of needle and
hook.
Adjust the timing of needle and hook.
Height of needle bar
Wrong timing of needle and
hook.
Adjust the timing of needle and hook.
Gap between needle and hook
Wrong timing of needle and
hook.
Adjust the timing of needle and hook.
3
Stitch skips
Remaining length of upper
thread
Adjust the thread adjusting device.
is short.
Due to bobbin racing during
Racing-proof spring trimming, lower thread dropping Change the racing protection
of bobbin case from bobbin case becomes too spring.
short to go up.
Take-up lever spring Unable to lift lower thread due to Adjust the working capacity
weak take-up lever spring. of take-up lever spring.
4
Upper thread Too tight upper thread tension. Reduce tension of upper thread.
does not sink. Too loose lower thread tension. Increase tension OF lower thread.
5
Lower thread Too tight upper thread tension. Too strong lower thread tension.
does not sink.
Increase tension of upper
thread.
Decrease tension of lower thread.
Tension of fixed blade Tension not aligned between
Adjust tension of movable and fixed blade.
movable and fixed blade.
Trimming Edge of movable and fixed Abrasion in blade groove of Replace movable and fixed blade.
errors blades movable and fixed blade.
Direction of needle Wrong needle insertion. Reinsert the needle correctly.
Check the crossing of trimmer Insufficeient crossing quantity of Adjust the stroke of movable and
cam notch mark and blade movable and fixed blade. fixed blade.
Upper thread
Too strong upper thread
tension.
Adjust tension of upper thread.
is pulled out Too thick a needle for thread. Check thickness of needle.
7
when sewing
Take-up lever pulls out the
upper
Adjust the up-stop position
commences. Check th up-stop position thread because the needle up of needle.
of needle and down position is too high.