Pfaff 335 Stitch Regulator - Equal Stitch Length For Forward And Reverse Stitching

[Anna1980]

Hello,

I have a little Problem with my new Pfaff 335 sewing machine. The stitch lenght for reverse stitching is smaller thant the forward stitching. I don't find an instruction, how to fix this problem in the service manual.

Does someone know how to adjust this?

Kind regards

Anna

[Constabulary]

Is it an older or new machine? Is it significant or just a tiny bit? If it just a tiny bit and it is an older machine it could be that the little wedge "thing" (don´t know the parts name) behind the stitch lenght regulartor is a bit worn.

[Anna1980]

Is it an older or new machine? Is it significant or just a tiny bit? If it just a tiny bit and it is an older machine it could be that the little wedge "thing" (don´t know the parts name) behind the stitch lenght regulartor is a bit worn.

It is an older machine, a yellow one, but as good as new with only a few operating hours. The difference of the stitch lenght is really significant, about 1,5 mm on the first stitch.

[Uwe]

Your reverse lever may not be "centered" properly. With stitch length set to max and needle at bottom dead center, the top and bottom feed dogs and should NOT move when moving the reverse lever up and down. If the feed dogs move, your forward and backward feed dog movements will not be equal. On page 11 of the 335 service manual ( https://www.pfaff-industrial.de/db-downloads/technicaldoc/justieranleitungen/300/ja_335_01-14_en/@@download/file/JA_335_01-14_EN.pdf) they talk about how to "center" the reverse lever. The manual is for the newer model, but often these mechanical adjustments are the same over several generations of the machine.

[DannyGray]

I believe Constabulary has touched on a part that is often overlooked when having stitch length problems in reverse. I have included both styles of the part we are talking about.