Pre 1980 Viking Husqvarna. The 6000 series
6430 Pictured above
I have had the opportunity to work on several 6000 series Viking machines in the past year.
They are in a class of their own and do require some special handeling.
Every one that I have delt with has had a crack in the internal cam and needed to be replaced.
Other common problems are slugish operation, stuck in reverse and no zigzag.
Whatever Viking used for lubricant back then turned to glue over the years and needs to be completely cleaned and re-lubed.
These machines are extremely popular to many seasoned sewers.
