2
CONDITION
CAUSE
HOW TO FIX
REFERENCE
3. Breaking
1. Initial sewing speed is
Start with medium speed.
upper
too fast.
thread
2. Thread path is incorrect.
Use the proper thread path.
3. Needle is bent or worn.
Replace with a new needle.
4. Upper thread tension is
Adjust the upper thread tension
too strong.
correctly.
5. Needle size is inappropriate
Use appropriate needle
for fabric.
for fabric and thread in use.
6. Needle eye is worn.
Change the needle.
7. Needle hole in needle
Repair the hole or
plate is worn or burred.
replace the needle plate.
4. Breaking
1. Incorrectly threaded
Thread bobbin correctly.
bobbin
bobbin.
2. Too much thread is
Adjust the position of
around on the bobbin.
bobbin winder stopper.
3. Lint is stuck inside the
Clean the shuttle.
bobbin holder.
4. Thread quality is
Change to a high quality
too low.
sewing thread.
5. Thread is jamming
Remove the jamming
around the bobbin.
thread.
5. Needle
1. Needle is hitting the
See mechanical
P.13
breaks
needle plate.
adjustment “Needle
position.”
2. Needle is bent or worn.
Change the needle.
3. Needle is hitting the
See mechanical
P.17
shuttle.
adjustment “Needle
clearance to shuttle.”
4. The fabric moves while
See mechanical
P.11
the needle is piercing
adjustment “Needle swing.”
it, or the needle zigzags
while in fabric.
5. Fabric is being pulled too
Guide the fabric gently
strongly while sewing.
while sewing.
thread
Summary of Contents for HD718
Page 1: ...SERVICE MANUAL PARTS LIST MODEL HD718 First Edition 19 May 2017...
Page 33: ...PARTS LIST...
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