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Hello!

I am new to leather working, and this is my first sewing machine. I have an old Pfaff 335 h3, with which I sewed perfectly for a while - the tension and the stitch were flawless. Suddenly  it started to punch holes in the leather without making any stitches or just making them from time to time.
My question is: why this happened and what should I do to make it work again? 
Any help will be much appreciated. 

I am attaching a video and a photo for a better understanding. Thank you in advance!

Gia

https://imgur.com/DHCHz5T

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Often the problem is just an not correctly adjusted needle bar but hard to tell from the distance. First thing I would do is checking the correct threading and the needle hook timing. Are you sure the needle is insert correctly and using the correct needle system? I guess you have a manual for your machine, right?

~ Keep "OLD CAST IRON" alive - it´s worth it ~

Machines in use: - Singer 111G156 - Singer 307G2 - Singer 29K71 - Singer 212G141 - Singer 45D91 - Singer 132K6 - Singer 108W20 - Singer 51WSV2 - Singer 143W2

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Posted

Hi and welcome, did you change anything or did it just start to not sew??

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Posted (edited)

Since I see a white machine I guess it is the current 335 model. Here is a service manual for the current 335 model. It should help you with the settings:

 

Pfaff 335 Service manual.pdf

Edited by Constabulary

~ Keep "OLD CAST IRON" alive - it´s worth it ~

Machines in use: - Singer 111G156 - Singer 307G2 - Singer 29K71 - Singer 212G141 - Singer 45D91 - Singer 132K6 - Singer 108W20 - Singer 51WSV2 - Singer 143W2

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Posted (edited)

settings should be the same I think. Are you sure you interst the needle correctly?

Edited by Constabulary

~ Keep "OLD CAST IRON" alive - it´s worth it ~

Machines in use: - Singer 111G156 - Singer 307G2 - Singer 29K71 - Singer 212G141 - Singer 45D91 - Singer 132K6 - Singer 108W20 - Singer 51WSV2 - Singer 143W2

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Posted (edited)
49 minutes ago, Constabulary said:

Often the problem is just an not correctly adjusted needle bar but hard to tell from the distance. First thing I would do is checking the correct threading and the needle hook timing. Are you sure the needle is insert correctly and using the correct needle system? I guess you have a manual for your machine, right?

Everything is done right, it worked perfectly until yesterday. 
I use these needles https://imgur.com/4YbcAnU with 20/3 thread. Sometimes it does a couple of stitches, and then none. 
 

6 minutes ago, Constabulary said:

Since I see a white machine I guess it is the current 335 model. Here is a service manual for the current 335 model. It should help you with the settings:

 

 

Pfaff 335 Service manual.pdf

It is the old model, from the 60s I guess. It was painted for a better look.

Edited by Gia
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Posted
55 minutes ago, jimi said:

Hi and welcome, did you change anything or did it just start to not sew??

I didn't change anything, it just started to not sew. 

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Posted
10 minutes ago, Constabulary said:

settings should be the same I think. Are you sure you interst the needle correctly?

Yes, it is inserted correctly. I did sew a lot without any problems before this happened.

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Posted

Is there any change to give me any guides to check if the timing works properly?

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Posted (edited)

Sometimes needle bar rise a little bit so w/o sitting in front of the machine I would guess you have to lower the NB a little bit. As I said before I would check the needle hook timing. Procedure is in the manual I have liked above.

Edited by Constabulary

~ Keep "OLD CAST IRON" alive - it´s worth it ~

Machines in use: - Singer 111G156 - Singer 307G2 - Singer 29K71 - Singer 212G141 - Singer 45D91 - Singer 132K6 - Singer 108W20 - Singer 51WSV2 - Singer 143W2

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