Strobel 310D-R - Troubleshooting and Maintenance; Resolving Common Sewing Problems

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5.4 Problems during sewing and troubleshooting
CAUTION! Danger of Injury!
Switch off the machine and ensure it is switched off by
pressing the pedal for switching the motor.
Otherwise there is a danger of injury through crushing and
needle stitches.
• Thread breaking
Possible causes:
- sharp edges or grooves in needle guide, take-up lever, shuttle or
needle eye when the machine has been used for a long time.
- The thread between shuttle and bobbin case breaks or is pinched off.
- Too much oil has penetrated the shuttle path
- The bobbin is packed too tight or the bobbin sides are forced apart
because the thread is too tightly wound.
- Bobbin case vent or shuttle bridge are not correctly adjusted.
- The shuttle to needle or needle rise has not been correctly adjusted or
has become displaced, meaning that the thread loop is not always
taken up.
- Thread tension is set too slack or too tight.
Remedy:
- Replace or re-polish the damaged parts
- Dismantle shuttle, remove bobbin case and polish the feed edges of
the bobbin case and shuttle path.
- Using an absorbent thread (cotton thread, core spun thread), sew out
on a remnant.
- Insert new bobbin
- Slowly turn the machine by hand and check whether the loop slides
unimpeded through the shuttle. If not, readjust bobbin case vent or
shuttle bridge.
- Correct shuttle position or loop lift.
- Correct thread tension - check thread line.
ATTENTION! thread course, thread, needle plate with plunger and cloth
retainer, needle and thread tension should always be set
and chosen according to the material to be sewn.