Pfaff 139 has stuck wheel. bobbin cage-no loose threads. no needle movement. motor action spin belt but wheel not turn. Jammed sensation when trying to turn wheel. What's wrong?

SOURCE: thread or bobbin tension

Thread tension. Beware of adjusting the bobbin screw. Pfaffs maintain their tensions just fine without adjusting the bobbin tension, unless you're using some crazy thick or fine thread. If you must change your bobbin tension, you would be well-advised to buy an extra bobbin case, because re-calibrating your tensions after changing them can be less than fun.

Increase your top tension, and your looping should cease. I normally keep my tension around 4.5. Also make sure you're using a good quality thread, and that there's nothing in the upper tension assemblies. Sometimes a tiny piece of debris can keep the top tension from applying enough tension, so turning the machine off and blowing some canned air in there can help as well.

Good luck,

-R

SOURCE: necchi 534FB

I solved this problem for a friend,!. the needle was in the wrong way and
2 the bobbin case was not properly seated be sure you hear the 'click 'when
reinserting the bobbin case...hope this is helpful Velz

SOURCE: baby lock quest, blq2 bobbin problem

Concerning the Babylock Quest when using the reverse option I seem to be reading a few somplaits what is the best way to reverse without causing and adverse problems?
thanks
sewingcindy

SOURCE: needle thread will not pick up bobbin thread

I finally had to take it in for repair at Sears

SOURCE: Pfaff 2024 bobbin case basket is jammed-even after clean & oil

the jam that happened may have caused the machine to jump time & it would have to be serviced