Changing A Spool On A Threaded Machine - Pfaff coverlock 4852 Owner's Manual

Important note on threading
The needle(s) must always be threaded last
so that the needle threads do not run under
the looper thread as seen in drawing 1, but
instead over the looper thread as depicted
in drawing 2. Should this sequence not be
followed, thread breakage or missed stitches
can occur.
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If the looper threads break, you must
pull the needle threads out of the needle
eye, rethread the loopier thread and then
rethread the needle threads.

Changing a spool on a threaded machine

Cut the threads off close to the spool and
replace with new spools. Tie together the
threads which are still in the machine with
the new threads, and pull the threads out
of the needle eyes. Raise the presser foot.
Pull on the needle threads until the knots are
about 6 inches (15 cm) past the last thread
guide in front of the needles. Cut the knots off
and pull the threads through the respective
needle eyes. The looper threads can be pulled
continuously past the looper eye and placed to
the left underneath the presser foot.