Pfaff Coverlock 3.0 Owner's Manual page 35

4-thread overlock
When the upper looper thread lies on the underside of the
fabric
When the lower looper thread appears on the top of the
fabric
When the left needle thread tension is too loose
When the right needle thread tension is too loose
Safety stitch
When the lower looper thread tension is too loose
When the upper looper thread lies on the underside of
the fabric
When the lower looper thread appears on the top of the
fabric
When the right needle thread tension is too loose
When the chainstitch needle thread tension is too loose
Chainstitch
When the chainstitch needle thread tension is too loose
Coverstitch
When the coverstitch looper thread is too loose
When the coverstitch left needle thread tension is too loose
When the coverstitch middle needle thread tension is too
loose
When the coverstitch right needle thread tension is too
loose
When the top surface of fabric bulges between needle
threads and the seams on the underside of the fabric
becomes tight;
Move the upper looper thread tension lever (red) toward a
higher position.
(yellow) toward a lower position.
(yellow) toward a higher position.
(red) toward a lower position.
toward a higher position.
(green) toward a higher position.
(yellow) toward a higher position.
(red) to a higher position.
(yellow) to a lower position.
(yellow) toward a higher position.
(red) lever toward a lower position.
toward a higher position.
lever (blue) toward a higher position.
tuning lever (purple) toward a lower position.
toward a higher position.
lever (purple) toward a lower position.
(purple) toward a higher position.
lever (blue) toward a higher position. Or, move coverstitch
lower position.
tuning lever (green) toward a higher position. Or, move
toward a lower position.
tuning lever (red) toward a higher position. Or, move the
toward a lower position.
(purple) toward a lower position.
Stitch adjustments 35