What happens if bobbin tension is too loose?
A: Looping on the underside, or back of the fabric, means the top tension is too loose compared to the bobbin tension, so the bobbin thread is pulling too much top thread underneath. By tightening the top tension, the loops will stop, but the added tension may cause breakage, especially with sensitive threads.
Do Viking sewing machines need to be oiled?
Since 1972, Viking has made sewing machines that do not require oiling; however, to keep older Viking sewing machines, like the Model 2000, Class 20 or Husqvarna Zig-Zag, working according to specifications, monthly oiling is recommended. … If it comes away oily, the machine does not need oiling.