Pfaff creative 4874 Instruction Manual page 110

2-needle cover-stitch, narrow and wide
Stitch programs 01, 02
If all the thread tensions are set correctly,
the needle threads (blue and green) are
barely visible on the underside of the
fabric. The looper thread (purple) lies slack
between them.
The right needle thread (green) is too
loose.
Adjust the green thread tension to a
higher setting.
The needle threads (green and blue) are
set too tightly causing folds in the fabric.
Set the green and blue thread tension to a
lower value.
7-4