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Changing needle-what size allen wrench.

Anyone know the size of Allen wrench to use to replace needle on Pfaff 794 serger?

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Posted on Jan 02, 2017

bargainbox
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SOURCE: serger 794 from pfaff--calanda type 794

There are two holes running vertically inside the needle arm.........the needles are held firm by very small screws or hex allen keys.........they may have worked loose over time, if they have fallen out and been lost, it is a call to your  local Pfaff dealer for advice......be sure to quote model number.
Your User manual may have a diagram to assist.

Have you ever changed the needles since buying this machine ??
Needles ought to be changed every 6 - 8 hrs of sewing, and more often with heavy or abrasive fabric.

Posted on Nov 15, 2008

  • 3 Answers

SOURCE: Pfaff hobbylock 794

The needles are changed by inserted the hex wrench into what looks to be holes on the front and left side where the needles go into the machine.I'm not sure what size the hex wrench is but it's pretty small. From the manual,
"Removing Needle: Unplug the machine. Turn the handwheel counterclockwise to raise the needle bar to its highest position. Loosen the needle clamp with the allen wrench and pull the needle out." and
"Inserting needle: When the neddle bar is at the highest position, insert a new needle in the needle holder, making sure that the groove of the needle faces you. Push the needle as far up as it will go and tighten the needle clamp screw." "Removing Needle: Unplug the machine. Turn the handwheel counterclockwise to raise the needle bar to its highest position. Loosen the needle clamp with the allen wrench and pull the needle out."

The machine takes DB x 1, or 1738 needles, and a size 14 needle is recommended.

Hope this helps!

Posted on Jan 13, 2009

harborsai727
  • 1 Answer

SOURCE: I have a Pfaff Hobbylock 794 Serger and have lost one of the needle clamp screws. Where can I find replacements?

I lost one on my screws too. I simply went to my local Sewing machine store (in Tacoma, WA) and they ordered it for me. Got it in 3 days. Was easier to get then I thought considering how old the machine is. But they just don't make them like they used to. So, I'm holding onto my Hobbylock 794 as long as it'll keep being faithful.

Posted on Nov 25, 2012

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1 Answer

I have just snapped the needle on my Husqvana overlocker 905 how do I change the needles


The serger came with a tool just for that purpose. It may be a small screwdriver or it might be a hex or Allen wrench. Locate the screw that holds it in, insert the proper tool and turn counter clock wise until the needle will slide down, remove and replace with new needle, then tighten, clockewise the screw. You are done

Jul 05, 2014 | Sewing Machines

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Changing the needles


I agree it can be tricky. The paper over the feed dogs is a good trick. I use an offcut of sweatshirt fabric as its thick and the needles stick into it. And a good pair of tweezers to hold the needle up tight into the housing.

My Bernette requires a little screwdriver rather than an allen key and has two grub screws, so I get the two needles together with my fingers, having the left one a little lower than the right, then slide them into the housing. Then I tighten up one grub screw until it just holds the needle and focus on getting the other one all the way up, I use the screwdriver blade to support the needle in position, then keep it there with the tweezers and switch the screwdriver over to tighten up the grub screw. Then repeat with the other needle.

Another idea is to use a popsicle stick and put a blob of bluetack or plasticine onto it, use this to hold the two needles and apply upward pressure into the housing - you just need to ensure youve got them at different heights, most overlockers the left needle is lower than the right to form the stitches.

I don't think there is a purpose tool for this, just get a good set of tweezers and persist. Providing you start with the flat shank to the back of the machine, your needle should go into the housing the right way, just look at the eye and ensure it is facing the front fully.

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I am looking for where I can buy the Allen wrench for my simplicity SW432 serger. Please advise me where I can buy it. Thank you.


You can purchase complete sets of Allen wrenches in either SAE (U.S.) or Metric sizes at most hardware stores, home improvement stores, Radio Shack stores, etc. for relatively short money. If you can bring the screw with you or find out what size it is from inside your manual - you might be able to purchase only the particular wrench you need. If you can't find the size of the screw documented in your manual, you'll have to check both SAE and Metric sizes for the best fitting wrench .

Sewing machines often use very small fasteners and are precision devices through and through. Simply using a wrench that "fits" as opposed to the one that is the "correct size" will affect how many times you'll be able to loosen and tighten that screw. Using a wrench that "fits" will eventually wear out the screw head making it impossible to turn in or out, much quicker than using the correct size Allen wrench.

I hope this helps and good luck. Please rate my reply. Thank you.

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It shows you in the instruction book. I can't remember that model, but I think you need either a small Allen wrench but it may be a small flat screwdriver. Don't remove the screw, you just loosen the small set screw a turn or two to release needles, tighten the screws to hold the needles.

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Hobylock 794 serger right looper needle position...I took it out to thread it and can't get it in the right position to sew correctly


I had the same problem. the last resort was go get a professional repair person. i had to replace the whole needle shaft. then the tension feeds were looked and i have never been more satisfied.

Nov 10, 2010 | PfaFF Hobby 4260

1 Answer

I can't find the way to change the left needle.


You can order a manual here - http://www.sewusa.com/Sewing_Machine_Manuals/Pfaff_Manuals/794_796_Hobbylock_Instruction_Manual.htm

In the meantime, contact your local Pfaff dealer. Ask if someone can help you if you bring the serger in.

Mar 18, 2010 | PfaFF Hobby 4260

1 Answer

Serger 794 from pfaff--calanda type 794


There are two holes running vertically inside the needle arm.........the needles are held firm by very small screws or hex allen keys.........they may have worked loose over time, if they have fallen out and been lost, it is a call to your  local Pfaff dealer for advice......be sure to quote model number.
Your User manual may have a diagram to assist.

Have you ever changed the needles since buying this machine ??
Needles ought to be changed every 6 - 8 hrs of sewing, and more often with heavy or abrasive fabric.

Nov 15, 2008 | PfaFF Sewing Machines

1 Answer

Pfaff hobbylock 794


The needles are changed by inserted the hex wrench into what looks to be holes on the front and left side where the needles go into the machine.I'm not sure what size the hex wrench is but it's pretty small. From the manual,
"Removing Needle: Unplug the machine. Turn the handwheel counterclockwise to raise the needle bar to its highest position. Loosen the needle clamp with the allen wrench and pull the needle out." and
"Inserting needle: When the neddle bar is at the highest position, insert a new needle in the needle holder, making sure that the groove of the needle faces you. Push the needle as far up as it will go and tighten the needle clamp screw." "Removing Needle: Unplug the machine. Turn the handwheel counterclockwise to raise the needle bar to its highest position. Loosen the needle clamp with the allen wrench and pull the needle out."

The machine takes DB x 1, or 1738 needles, and a size 14 needle is recommended.

Hope this helps!

Mar 31, 2008 | PfaFF Hobby 4260

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