Pfaff 340.521.541.721.741 manual Faults and how to remedy them Cause, Needle thread breaks

Faults and how to remedy them

Cause:

1. Machine skips stitches

Needle not inserted correctly.

Wrong needle used.

Needle bent or blunt.

Machine threaded improperly.

Needle too thin for thread used.

2. Needle thread breaks

For any of the above reasons.

Thread tension too strong.

Poor-quality or knotty thread used, or thread that has become too dry by excessive storage.

3. Needle breaks

Needle not pushed up as far as it

will go.

Needle bent.

Needle too thin or too thick.

Needle bent and strikes needle plate because work is pushed or pulled.

Bobbin case improperly inserted.

4.Seam is not uniform Tension out of adjustment. Thread too thick, knotty or hard. Bobbin thread wound unevenly.

Kinks appear on top and bottom of

/

Remedy:

Push needle up as far as it will go, its flat shank side facing toward the back.

Insert system 130/705 H needle.

Insert new needle.

Check threading.

Select needle according to Needle Chart.

See par. 1 above.

Regulate thread tensions.

Use only good-quality thread.

Insert new needle and push it up as far

as it will go.

Insert new needle.

See Needle Chart.

Let machine feed the work alone.

Only guide the material lightly.

When inserting the bobbin case, push it in as far as it will go.

Check upper and lower tensions.

Use first-class thread only.

During bobbin winding, do not hold thread in hand, but pass it through the bobbin tension stud.

Thread machine properly and check

material. both tensions.