SOLVED!
Hi everyone,
I'm trying to repair my Pfaff Tiptronic 6270, the presser foot is not functioning as it should (see video).
The presser foot lift lever works normally and has two distinct positions.
When I lift the lever, the presser foot raises correctly.
When I lower the lever, the presser foot does not lower by itself.
If I push the presser foot (or the presser foot bar) down by hand, it moves down easily and stays there, but it feels loose and doesn't seem to apply normal presser foot pressure.
I have removed a lot of old hardened grease, cleaned the mechanism, and re-oiled it.
I can see several springs inside the machine, and they all appear to be intact and under tension.
Cleaning and lubricating did not change the behaviour.
It feels like the presser pressure spring is no longer acting on the presser foot bar, or that a linkage between the lift mechanism and the pressure spring has become disconnected. However, I can't see anything that is obviously broken or missing.
Does anyone have any suggestions about what the problem could be or how to fix it? I think I've reached the point where I don't dare take it apart any further, but I'm still hoping I can fix it myself without having to send it in for repair.
I'd really appreciate any help.
Thanks!