Singer 9020 - Adjust the sewing machine needle timing

Clean lint and debris from the shuttle race every 3 months because it often attracts lint and dust.
Clean the feed dogs at the same time because they also attract lint and dust. Clean those areas
more often when using the sewing machine regularly. Oil the sewing machine after cleaning.
Adjust the sewing machine needle timing
If the machine won’t pick up the bobbin thread because the shuttle hook isn’t synched with the
needle, adjust the needle timing. Adjustment of the needle timing usually requires service by a
technician. Using special tools, the technician positions the needle and loosens the shuttle drive
gear set screws then adjusts the shuttle drive gear to synchronize the shuttle hook with the
needle.