Singer CLASS 99 instruction manual Breaking of Needle Thread Might be Caused by

Class 99 & 99K

Breaking of Needle Thread Might be Caused by:

1.A knot in thread.

2.Improper threading -- see page 13.

3.Upper tension is too tight -- see pages 22 - 23.

4.Needle not pushed up as far as it will go into needle clamp -- see page 12.

5.Needle blunt or bent.

6.Thread too coarse for needle -- see page 11.

7.Roughened hole in throat plate.

8.Improper arrangement of threads to start sewing -- see page 18.

Breaking of Bobbin Thread Might be Caused by:

1.Improper threading of bobbin case -- see pages 17 - 18.

2.Bobbin thread tension too tight -- see pages 22 - 23.

Skipping of Stitches Might be Caused by:

1.Needle not pushed up as far as it will go into needle clamp -- see page 12.

2.Needle blunt or bent.

3.Needle too small for thread -- see page 11.

If machine runs heavily after standing idle for a long period, apply a few drops of paraffin at all oiling places, run machine for a few minutes, then wipe clean and oil the machine -- see pages 9 - 10.

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