Cause, Both tensions, Fundamental rules

Cause:	Remedy:
4. Seam is not uniform
Tension out of adjustment.	Check upper and lower tensions.
Thread too thick, knotty or hard.	Use first-class thread only.
Bobbin thread wound unevenly.	During bobbin winding, do not hold
	thread in hand, but pass it through the
	bobbin tension stud.
Kinks appear on top and bottom of	Thread machine properly and check
material,	both tensions.
5. Machine feeds irregularly or not at all
Lint has accumulated between tooth	Remove needle plate and clean out
rows of feed dog.	lint.
Feed dog dropped. (Drop-feed control	Flick drop-feed control to the left.
is at right.)
6. Machine runs with difficulty
Thread ends in hook raceway.	Remove thread ends and put a drop of
	oil into hook raceway.

7. Fundamental rules

Never run a threaded machine unless there is a piece of fabric under the sewing foot. If you have to leave the machine, even for a short while, be sure to switch off the master switch. This is particularly important when children are around.

Cause:

both tensions.

7. Fundamental rules