ENGLISH
166
Problem Cause Action Page
Incorrect bottom thread tension Bottom thread incorrectly threaded 17
The bobbin case and/or the gripper
are full of fluff
Clean the bobbin case and/or the
gripper
49
The bottom thread
breaks off
The bobbin case is damaged or not
working properly
Replace the bobbin case 15
The needle is not correctly inserted Insert the needle correctly 12
The needle is bent or blunt Replace the needle 12
The needle screw is loose Tighten the needle screw 12
The top thread is too tight Reduce the thread tension 20
The needle breaks
off
The needle is too thin for the fabric Use a suitable needle 12, 13
The needle is not correctly inserted Insert the needle correctly 12
The needle is bent or blunt Replace the needle 12
Neither the needle nor the thread
are suitable for the fabric
Use the correct needle and thread
for the fabric
13
Skipped stitches
The top thread is incorrectly
threaded
Rethread the top thread 18
The top thread is too tight Reduce the thread tension 20
Incorrectly threaded sewing
machine
Rethread the machine 18
The needle is too thick for the fabric
Select the correct needle according
to the needle and thread table
13
The stitches are too long for the
fabric
Reduce the stitch length 22
The fabric creases
Very thin material:
No unwoven lining has been used
Use unwoven lining
The top thread tension is
insufficient
Increase the thread tension 20 The stitches form
loops
Incorrect needle and thread for the
fabric (too thick or too thin)
Use the correct needle and thread
size according to the needle and
thread table
13
The feed dog is full of fluff Clean the feed dog 50
The feed dog has dropped Raise the feed dog 24
The fabric is not fed
forwards as it
should be
The stitches are too short Increase the stitch length 22
Incorrect connection Connect the machine correctly 8
The thread becomes tangled in the
bobbin case pin
Clean the bobbin case and the
gripper
49
The sewing
machine does not
sew
The handwheel is set for spool
winding
Return the handwheel to its original
position
16
The thread becomes tangled in the
bobbin case pin
Clean the gripper 49
The feed dog is full of fluff Clean the feed dog 50
The sewing
machine is running
slowly and noisily
The machine needs to be lubricated
Oil the machine 51
Jula reserves the right to make changes. In the event of problems, please contact our service
department.
www.jula.com
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