Pfaff 191-5 timing

[mollieelle]

Hi all. I have a new to me Pfaff 191-5 in the shop that needs timing and was wondering if anyone has experience timing this machine? I cannot locate a service manual for it and am having trouble identifying the screws to free the hook to rotate. I’ve compared to post bed manuals I can find with no luck. 
 

Any help is much appreciated. 
 

[trash treasure]

Here's a link to the manual, I think, but you have to pay for it :

https://www.paypal.com/webapps/shoppingcart?mfid=1576761307702_cfa11ca903db8&flowlogging_id=cfa11ca903db8#/checkout/shoppingCart

It came from here - Lots of Pfaff manuals :

http://www.pfaffmanuals.com/Pfaff_Industrial_Manuals.htm

 

[mollieelle]

Thanks @trash treasure That is, however, the instruction or operating manual. Which does not include any information about timing the machine unfortunately. 

 

I would need what is called the service or adjustment manual. Which I have scoured for and cannot find. 

Edited December 19, 2019 by mollieelle

[Michiel]

If you cannot find an service manual

i would try it with an other brand postbed sewing machine

the adler 68 looks not verry different to me

 http://www.duerkopp-adler.com/commons/download/download-text-attachments/Vintage_Manuals_Adler/Manual_Adler_68.pdf

if that doesnot work you could use the partsmanual for your machine and for the adler to find out how it is for your machine

it might be a puzzle but if you print them all and do some close reading you can do it (for me this method works)

http://www.duerkopp-adler.com/commons/download/download-text-attachments/Vintage_Parts_Books_Adler/68.pdf

 

[mollieelle]

Thanks @Michiel That is my usual strategy as well. I’ve read the Adler 68 manual and watched a video of that machine being serviced and timed by @Uwe. I’ve also read every pfaff post bed service manual. While they are close, there seems to be a critical screw that requires loosening on my machine that I am not finding by puzzling. 

 

With the screws loose I can see to loosen from the cumulative manuals, the hook is still not free to rotate. 

Edited December 19, 2019 by mollieelle

[Constabulary]

I haven an english language Pfaff 141-5 Manual. The head part is the same as on you 191 (permanent wheel feed + roller foot), the bed section is of course different. The file size is to big to attach here so when you send me your email address by PM I can forward the PDF to you. Maybe that helps you.

You only say "that needs timing" so what particular problem do you haven or what problem is not covered in the other manuals. What screw do you mean? Please post pictures (not too small please).

[mollieelle]

@Constabulary Thanks so much. Is it an operators/instruction manual or a service manual? Unfortunately the operators/instruction manuals do not have the info I need. 

 

The hook is not meeting the needle at the correct time. The hook needs to be rotated  in the post to time it to meet the needle correctly. There are generally a set of screws that need to be loosened in order to allow the hook shaft to rotate independently. I’ve loosened the screws I know to, however, the hook shaft is not free to rotate. So I’m missing a screw or a step to free thehook shaft to rotate. 

Your machine could well be quite similar and if you had a service/adjustment manual that would be super useful  

[Constabulary]

instruction manual - no service manual, sorry!

Maybe this pictures gives you an idea - its from a 595 parts list and it should pretty much the same as on your machine I think.

[trash treasure]

If I had to do it without a manual, I think I'd loosen that large bevel gear (In the lower left view), and then you could turn the hook shaft, to adjust. But maybe I'm missing something - Probably ......

[mollieelle]

@trash treasure That's exactly what I thought would do it but no such luck. It definitely seems there's a sneaky screw or novel mechanism that im missing.