Pfaff coverlock 4.0 Owner's Manual - Page 40

Chainstitch When the chainstitch needle thread tension is too loose Increase the needle thread tension (blue), or decrease the chainstitch looper thread tension (purple). Coverstitch When the coverstitch looper thread is too loose When the coverstitch left needle thread tension is too loose Increase the coverstitch looper thread tension (purple). Increase the coverstitch left needle thread tension (blue), or decrease the coverstitch looper thread tension (purple). When the coverstitch middle needle thread tension is too Increase the coverstitch middle needle thread tension loose (green), or decrease the coverstitch looper thread tension (purple). 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; Increase the coverstitch right needle thread tension (red), or decrease the coverstitch looper thread tension (purple). Decrease the coverstitch looper thread tension (purple). 40 Stitch adjustments